Can I still write dll files in Visual basic.net?
12  1644 
You can use VB.NET (or C#) to create the equivalent to a VB 6 ActiveX DLL
using COM Interop. These DLLs could be used by .NET apps or VB (more
specificaly COM) apps. NOTE: If you want to create a DLL in VB.NET that will
be used by a VB 6 front-end you will need to deploy the .NET Framework to
the machines that will use the DLL.
--
Rob Windsor [MVP-VB]
G6 Consulting
Toronto, Canada
"Daryl Davis" <th***********@hotmail.com> wrote in message
news:Oe**************@tk2msftngp13.phx.gbl... Can I still write dll files in Visual basic.net?
What I want to do....
is write a .net dll to call vb6 dll's so that i have it wrapped so to speak.
Daryl
"Rob Windsor [MVP]" <rw******@NO.MORE.SPAM.bigfoot.com> wrote in message
news:em**************@TK2MSFTNGP10.phx.gbl... You can use VB.NET (or C#) to create the equivalent to a VB 6 ActiveX DLL
using COM Interop. These DLLs could be used by .NET apps or VB (more
specificaly COM) apps. NOTE: If you want to create a DLL in VB.NET that
will be used by a VB 6 front-end you will need to deploy the .NET Framework to
the machines that will use the DLL.
--
Rob Windsor [MVP-VB]
G6 Consulting
Toronto, Canada
"Daryl Davis" <th***********@hotmail.com> wrote in message
news:Oe**************@tk2msftngp13.phx.gbl... Can I still write dll files in Visual basic.net?
Hi Daryl,
..NET handles that for you! If you're using Visual Studio just go to the "Add
Reference" dialog and pick your VB 6 DLL from the list in the COM tab.
Visual Studio will create a .NET DLL wrapper for you automatically.
You you're not using VS then you need to use the tlbimp.exe command line
utility which is part of the .NET Framework SDK. See the link below for more
info on this utility http://msdn.microsoft.com/library/de...rTlbimpexe.asp
--
Rob Windsor [MVP-VB]
G6 Consulting
Toronto, Canada
"Daryl Davis" <th***********@hotmail.com> wrote in message
news:O$**************@TK2MSFTNGP11.phx.gbl... What I want to do....
is write a .net dll to call vb6 dll's so that i have it wrapped so to
speak. Daryl
"Rob Windsor [MVP]" <rw******@NO.MORE.SPAM.bigfoot.com> wrote in message
news:em**************@TK2MSFTNGP10.phx.gbl... You can use VB.NET (or C#) to create the equivalent to a VB 6 ActiveX
DLL using COM Interop. These DLLs could be used by .NET apps or VB (more
specificaly COM) apps. NOTE: If you want to create a DLL in VB.NET that
will be used by a VB 6 front-end you will need to deploy the .NET Framework
to the machines that will use the DLL.
--
Rob Windsor [MVP-VB]
G6 Consulting
Toronto, Canada
"Daryl Davis" <th***********@hotmail.com> wrote in message
news:Oe**************@tk2msftngp13.phx.gbl... Can I still write dll files in Visual basic.net?
This is what I understand. What I don't understand is how I make the
program go to the MTS server (another machine) for all the calls..
I got some advice from AlexFeinman_MVP on the chat about smartdevices today,
but by the time I was able to try it out, I was unable to call any of my
functions. I think it is that I am just unable to understand this area
because it has been thrown on me and I am just learning web services. Can
you help shed some light.
Thank you,
Daryl
<snip from chat>
AlexFeinman_MVP : Q: How do I write a web service that uses a remote MTS
component written in VB6 (using late binding)
AlexFeinman_MVP : A: Use Dim t as Type =
Type.GetFromProgID(componentProgID) to obtain a runtime type and then
Activator.CreateInstance to create an instance of the component. Once you
have an instance, use Type.InvokeMember to call methods.properties by name
AlexFeinman_MVP : .
"Rob Windsor [MVP]" <rw******@NO.MORE.SPAM.bigfoot.com> wrote in message
news:e5****************@TK2MSFTNGP12.phx.gbl... Hi Daryl,
.NET handles that for you! If you're using Visual Studio just go to the
"Add Reference" dialog and pick your VB 6 DLL from the list in the COM tab.
Visual Studio will create a .NET DLL wrapper for you automatically.
You you're not using VS then you need to use the tlbimp.exe command line
utility which is part of the .NET Framework SDK. See the link below for
more info on this utility
http://msdn.microsoft.com/library/de...rTlbimpexe.asp
--
Rob Windsor [MVP-VB]
G6 Consulting
Toronto, Canada
"Daryl Davis" <th***********@hotmail.com> wrote in message
news:O$**************@TK2MSFTNGP11.phx.gbl... What I want to do....
is write a .net dll to call vb6 dll's so that i have it wrapped so to
speak. Daryl
"Rob Windsor [MVP]" <rw******@NO.MORE.SPAM.bigfoot.com> wrote in message
news:em**************@TK2MSFTNGP10.phx.gbl... You can use VB.NET (or C#) to create the equivalent to a VB 6 ActiveX DLL using COM Interop. These DLLs could be used by .NET apps or VB (more
specificaly COM) apps. NOTE: If you want to create a DLL in VB.NET
that will be used by a VB 6 front-end you will need to deploy the .NET Framework
to the machines that will use the DLL.
--
Rob Windsor [MVP-VB]
G6 Consulting
Toronto, Canada
"Daryl Davis" <th***********@hotmail.com> wrote in message
news:Oe**************@tk2msftngp13.phx.gbl...
> Can I still write dll files in Visual basic.net?
>
>
Hi Daryl,
Alex is right, you can do it that way but you can also do it using a more VB
6 style. The CreateObject function is still available in VB.NET so you could
use:
Dim obj As Object
obj = CreateObject("MyComp.MyClass", "MyServer")
' use object
System.Runtime.InteropServices.Marshal.ReleaseComO bject(obj)
obj = Nothing
Note this code shows how to use the object late bound and requires Option
Strict Off. You can do this early bound by setting a reference to your
component and using a variable to the correct type, this would of course be
preferred.
Rob
"Daryl Davis" <th***********@hotmail.com> wrote in message
news:e9**************@tk2msftngp13.phx.gbl... This is what I understand. What I don't understand is how I make the
program go to the MTS server (another machine) for all the calls..
I got some advice from AlexFeinman_MVP on the chat about smartdevices
today, but by the time I was able to try it out, I was unable to call any of my
functions. I think it is that I am just unable to understand this area
because it has been thrown on me and I am just learning web services. Can
you help shed some light.
Thank you,
Daryl
<snip from chat>
AlexFeinman_MVP : Q: How do I write a web service that uses a remote
MTS component written in VB6 (using late binding)
AlexFeinman_MVP : A: Use Dim t as Type =
Type.GetFromProgID(componentProgID) to obtain a runtime type and then
Activator.CreateInstance to create an instance of the component. Once you
have an instance, use Type.InvokeMember to call methods.properties by name
AlexFeinman_MVP : .
"Rob Windsor [MVP]" <rw******@NO.MORE.SPAM.bigfoot.com> wrote in message
news:e5****************@TK2MSFTNGP12.phx.gbl... Hi Daryl,
.NET handles that for you! If you're using Visual Studio just go to the
"Add Reference" dialog and pick your VB 6 DLL from the list in the COM tab.
Visual Studio will create a .NET DLL wrapper for you automatically.
You you're not using VS then you need to use the tlbimp.exe command line
utility which is part of the .NET Framework SDK. See the link below for
more info on this utility
http://msdn.microsoft.com/library/de...rTlbimpexe.asp
--
Rob Windsor [MVP-VB]
G6 Consulting
Toronto, Canada
"Daryl Davis" <th***********@hotmail.com> wrote in message
news:O$**************@TK2MSFTNGP11.phx.gbl... What I want to do....
is write a .net dll to call vb6 dll's so that i have it wrapped so to
speak. Daryl
"Rob Windsor [MVP]" <rw******@NO.MORE.SPAM.bigfoot.com> wrote in
message news:em**************@TK2MSFTNGP10.phx.gbl...
> You can use VB.NET (or C#) to create the equivalent to a VB 6
ActiveX DLL > using COM Interop. These DLLs could be used by .NET apps or VB (more
> specificaly COM) apps. NOTE: If you want to create a DLL in VB.NET that will
> be used by a VB 6 front-end you will need to deploy the .NET
Framework to > the machines that will use the DLL.
>
> --
> Rob Windsor [MVP-VB]
> G6 Consulting
> Toronto, Canada
>
>
> "Daryl Davis" <th***********@hotmail.com> wrote in message
> news:Oe**************@tk2msftngp13.phx.gbl...
> > Can I still write dll files in Visual basic.net?
> >
> >
>
>
If I early bind a reference locally can I use it like this? Dim obj As Object
dim param1 as MyComp.MyClass.MyType
dim param2 as boolean = false
dim intReturn as integer
param1.int1 = 1
param1.string1 = "trial and error"
param1.int2 = 3
obj = CreateObject("MyComp.MyClass", "MyServer")
' use object
intReturn = obj.myfunction(param1,param2) System.Runtime.InteropServices.Marshal.ReleaseComO bject(obj)
obj = Nothing
Note this code shows how to use the object late bound and requires Option
Strict Off. You can do this early bound by setting a reference to your
component and using a variable to the correct type, this would of course
be preferred.
Rob
"Daryl Davis" <th***********@hotmail.com> wrote in message
news:e9**************@tk2msftngp13.phx.gbl... This is what I understand. What I don't understand is how I make the
program go to the MTS server (another machine) for all the calls..
I got some advice from AlexFeinman_MVP on the chat about smartdevices
today, but by the time I was able to try it out, I was unable to call any of my
functions. I think it is that I am just unable to understand this area
because it has been thrown on me and I am just learning web services.
Can you help shed some light.
Thank you,
Daryl
<snip from chat>
AlexFeinman_MVP : Q: How do I write a web service that uses a remote
MTS component written in VB6 (using late binding)
AlexFeinman_MVP : A: Use Dim t as Type =
Type.GetFromProgID(componentProgID) to obtain a runtime type and then
Activator.CreateInstance to create an instance of the component. Once
you have an instance, use Type.InvokeMember to call methods.properties by
name AlexFeinman_MVP : .
"Rob Windsor [MVP]" <rw******@NO.MORE.SPAM.bigfoot.com> wrote in message
news:e5****************@TK2MSFTNGP12.phx.gbl... Hi Daryl,
.NET handles that for you! If you're using Visual Studio just go to
the "Add Reference" dialog and pick your VB 6 DLL from the list in the COM tab.
Visual Studio will create a .NET DLL wrapper for you automatically.
You you're not using VS then you need to use the tlbimp.exe command
line utility which is part of the .NET Framework SDK. See the link below
for more info on this utility
http://msdn.microsoft.com/library/de...rTlbimpexe.asp
--
Rob Windsor [MVP-VB]
G6 Consulting
Toronto, Canada
"Daryl Davis" <th***********@hotmail.com> wrote in message
news:O$**************@TK2MSFTNGP11.phx.gbl...
> What I want to do....
> is write a .net dll to call vb6 dll's so that i have it wrapped so
to speak.
> Daryl
>
> "Rob Windsor [MVP]" <rw******@NO.MORE.SPAM.bigfoot.com> wrote in
message > news:em**************@TK2MSFTNGP10.phx.gbl...
> > You can use VB.NET (or C#) to create the equivalent to a VB 6 ActiveX DLL
> > using COM Interop. These DLLs could be used by .NET apps or VB
(more > > specificaly COM) apps. NOTE: If you want to create a DLL in VB.NET
that > will
> > be used by a VB 6 front-end you will need to deploy the .NET Framework to
> > the machines that will use the DLL.
> >
> > --
> > Rob Windsor [MVP-VB]
> > G6 Consulting
> > Toronto, Canada
> >
> >
> > "Daryl Davis" <th***********@hotmail.com> wrote in message
> > news:Oe**************@tk2msftngp13.phx.gbl...
> > > Can I still write dll files in Visual basic.net?
> > >
> > >
> >
> >
>
>
I should also state that this is in a web service so that smartdevices can
access the dll. (I hope that doesn't throw this whole thing off...)
Daryl
"Rob Windsor [MVP]" <rw******@NO.MORE.SPAM.bigfoot.com> wrote in message
news:%2******************@TK2MSFTNGP10.phx.gbl... Hi Daryl,
Alex is right, you can do it that way but you can also do it using a more
VB 6 style. The CreateObject function is still available in VB.NET so you
could use:
Dim obj As Object
obj = CreateObject("MyComp.MyClass", "MyServer")
' use object
System.Runtime.InteropServices.Marshal.ReleaseComO bject(obj)
obj = Nothing
Note this code shows how to use the object late bound and requires Option
Strict Off. You can do this early bound by setting a reference to your
component and using a variable to the correct type, this would of course
be preferred.
Rob
"Daryl Davis" <th***********@hotmail.com> wrote in message
news:e9**************@tk2msftngp13.phx.gbl... This is what I understand. What I don't understand is how I make the
program go to the MTS server (another machine) for all the calls..
I got some advice from AlexFeinman_MVP on the chat about smartdevices
today, but by the time I was able to try it out, I was unable to call any of my
functions. I think it is that I am just unable to understand this area
because it has been thrown on me and I am just learning web services.
Can you help shed some light.
Thank you,
Daryl
<snip from chat>
AlexFeinman_MVP : Q: How do I write a web service that uses a remote
MTS component written in VB6 (using late binding)
AlexFeinman_MVP : A: Use Dim t as Type =
Type.GetFromProgID(componentProgID) to obtain a runtime type and then
Activator.CreateInstance to create an instance of the component. Once
you have an instance, use Type.InvokeMember to call methods.properties by
name AlexFeinman_MVP : .
"Rob Windsor [MVP]" <rw******@NO.MORE.SPAM.bigfoot.com> wrote in message
news:e5****************@TK2MSFTNGP12.phx.gbl... Hi Daryl,
.NET handles that for you! If you're using Visual Studio just go to
the "Add Reference" dialog and pick your VB 6 DLL from the list in the COM tab.
Visual Studio will create a .NET DLL wrapper for you automatically.
You you're not using VS then you need to use the tlbimp.exe command
line utility which is part of the .NET Framework SDK. See the link below
for more info on this utility
http://msdn.microsoft.com/library/de...rTlbimpexe.asp
--
Rob Windsor [MVP-VB]
G6 Consulting
Toronto, Canada
"Daryl Davis" <th***********@hotmail.com> wrote in message
news:O$**************@TK2MSFTNGP11.phx.gbl...
> What I want to do....
> is write a .net dll to call vb6 dll's so that i have it wrapped so
to speak.
> Daryl
>
> "Rob Windsor [MVP]" <rw******@NO.MORE.SPAM.bigfoot.com> wrote in
message > news:em**************@TK2MSFTNGP10.phx.gbl...
> > You can use VB.NET (or C#) to create the equivalent to a VB 6 ActiveX DLL
> > using COM Interop. These DLLs could be used by .NET apps or VB
(more > > specificaly COM) apps. NOTE: If you want to create a DLL in VB.NET
that > will
> > be used by a VB 6 front-end you will need to deploy the .NET Framework to
> > the machines that will use the DLL.
> >
> > --
> > Rob Windsor [MVP-VB]
> > G6 Consulting
> > Toronto, Canada
> >
> >
> > "Daryl Davis" <th***********@hotmail.com> wrote in message
> > news:Oe**************@tk2msftngp13.phx.gbl...
> > > Can I still write dll files in Visual basic.net?
> > >
> > >
> >
> >
>
>
You've kind of got the right idea. Let's look at two examples:
Ex A:
Dim obj As Object
obj = CreateObject("MyComp.MyClass", "MyServer")
Ex B:
Dim obj As MyComp.MyClass
obj = CreateObject("MyComp.MyClass", "MyServer")
The variable in Ex A is late bound. The compiler knows that it will refer to
an object but it has no idea what kind of object thus all calls to methods
or properties will be resolved at run time.
The variable in Ex B is early bound. The compiler knows it is refering to an
object of type MyClass and will use the metadata from the assembly (which
was generated from the type library of the COM component) to validate all
calls to methods or properties at compile time.
Hope this helps,
--
Rob Windsor [MVP-VB]
G6 Consulting
Toronto, Canada
"Daryl Davis" <th***********@hotmail.com> wrote in message
news:%2****************@TK2MSFTNGP11.phx.gbl... If I early bind a reference locally can I use it like this?
Dim obj As Object
dim param1 as MyComp.MyClass.MyType
dim param2 as boolean = false
dim intReturn as integer
param1.int1 = 1
param1.string1 = "trial and error"
param1.int2 = 3
obj = CreateObject("MyComp.MyClass", "MyServer")
' use object
intReturn = obj.myfunction(param1,param2) System.Runtime.InteropServices.Marshal.ReleaseComO bject(obj)
obj = Nothing
Note this code shows how to use the object late bound and requires
Option Strict Off. You can do this early bound by setting a reference to your
component and using a variable to the correct type, this would of course
be preferred.
Rob
"Daryl Davis" <th***********@hotmail.com> wrote in message
news:e9**************@tk2msftngp13.phx.gbl... This is what I understand. What I don't understand is how I make the
program go to the MTS server (another machine) for all the calls..
I got some advice from AlexFeinman_MVP on the chat about smartdevices
today, but by the time I was able to try it out, I was unable to call any of
my functions. I think it is that I am just unable to understand this
area because it has been thrown on me and I am just learning web services. Can you help shed some light.
Thank you,
Daryl
<snip from chat>
AlexFeinman_MVP : Q: How do I write a web service that uses a
remote MTS component written in VB6 (using late binding)
AlexFeinman_MVP : A: Use Dim t as Type =
Type.GetFromProgID(componentProgID) to obtain a runtime type and then
Activator.CreateInstance to create an instance of the component. Once you have an instance, use Type.InvokeMember to call methods.properties by name AlexFeinman_MVP : .
"Rob Windsor [MVP]" <rw******@NO.MORE.SPAM.bigfoot.com> wrote in
message news:e5****************@TK2MSFTNGP12.phx.gbl...
> Hi Daryl,
>
> .NET handles that for you! If you're using Visual Studio just go to
the "Add
> Reference" dialog and pick your VB 6 DLL from the list in the COM
tab. > Visual Studio will create a .NET DLL wrapper for you automatically.
>
> You you're not using VS then you need to use the tlbimp.exe command line > utility which is part of the .NET Framework SDK. See the link below for more
> info on this utility
>
>
http://msdn.microsoft.com/library/de...rTlbimpexe.asp >
> --
> Rob Windsor [MVP-VB]
> G6 Consulting
> Toronto, Canada
>
>
> "Daryl Davis" <th***********@hotmail.com> wrote in message
> news:O$**************@TK2MSFTNGP11.phx.gbl...
> > What I want to do....
> > is write a .net dll to call vb6 dll's so that i have it wrapped so to > speak.
> > Daryl
> >
> > "Rob Windsor [MVP]" <rw******@NO.MORE.SPAM.bigfoot.com> wrote in
message > > news:em**************@TK2MSFTNGP10.phx.gbl...
> > > You can use VB.NET (or C#) to create the equivalent to a VB 6
ActiveX > DLL
> > > using COM Interop. These DLLs could be used by .NET apps or VB (more > > > specificaly COM) apps. NOTE: If you want to create a DLL in
VB.NET that
> > will
> > > be used by a VB 6 front-end you will need to deploy the .NET
Framework > to
> > > the machines that will use the DLL.
> > >
> > > --
> > > Rob Windsor [MVP-VB]
> > > G6 Consulting
> > > Toronto, Canada
> > >
> > >
> > > "Daryl Davis" <th***********@hotmail.com> wrote in message
> > > news:Oe**************@tk2msftngp13.phx.gbl...
> > > > Can I still write dll files in Visual basic.net?
> > > >
> > > >
> > >
> > >
> >
> >
>
>
Rob,
Then my problem must be that I am trying from a web service, or I am missing
something very basic. When I try to early bind I get the error "
Cannot convert to 'Interface salesDO'.
"
SalesDO is the class on the dll I am trying to call.
and when I try late binding and try call I get "
Run-time exception thrown : System.NullReferenceException - Object reference
not set to an instance of an object.
"
My test code (usually typed out in command window but here for example)....
try
Dim trying as hallsales.salesdo
dim sale as object
trying = createobject("hallsales.salesdo","\\192.168.10.1")
sale = createobject("hallsales.salesdo","\\192.168.10.1")
input = hallsales.saleTable2
input.CreditAmt = 20
input.posStation = 9
input.UserID = 5
trying.sellfrompos(input,true)
sale.sellfrompos(input,true)
catch ex
end try
Do you have any ideas? I know I must be missing something small, but
important.
Daryl Davis
"Rob Windsor [MVP]" <rw******@NO.MORE.SPAM.bigfoot.com> wrote in message
news:Op**************@TK2MSFTNGP09.phx.gbl... You've kind of got the right idea. Let's look at two examples:
Ex A:
Dim obj As Object
obj = CreateObject("MyComp.MyClass", "MyServer")
Ex B:
Dim obj As MyComp.MyClass
obj = CreateObject("MyComp.MyClass", "MyServer")
The variable in Ex A is late bound. The compiler knows that it will refer
to an object but it has no idea what kind of object thus all calls to methods
or properties will be resolved at run time.
The variable in Ex B is early bound. The compiler knows it is refering to
an object of type MyClass and will use the metadata from the assembly (which
was generated from the type library of the COM component) to validate all
calls to methods or properties at compile time.
Hope this helps,
--
Rob Windsor [MVP-VB]
G6 Consulting
Toronto, Canada
"Daryl Davis" <th***********@hotmail.com> wrote in message
news:%2****************@TK2MSFTNGP11.phx.gbl... If I early bind a reference locally can I use it like this?
Dim obj As Object dim param1 as MyComp.MyClass.MyType
dim param2 as boolean = false
dim intReturn as integer
param1.int1 = 1
param1.string1 = "trial and error"
param1.int2 = 3
obj = CreateObject("MyComp.MyClass", "MyServer")
' use object
intReturn = obj.myfunction(param1,param2) System.Runtime.InteropServices.Marshal.ReleaseComO bject(obj)
obj = Nothing
Note this code shows how to use the object late bound and requires Option Strict Off. You can do this early bound by setting a reference to your
component and using a variable to the correct type, this would of
course be preferred.
Rob
"Daryl Davis" <th***********@hotmail.com> wrote in message
news:e9**************@tk2msftngp13.phx.gbl...
> This is what I understand. What I don't understand is how I make
the > program go to the MTS server (another machine) for all the calls..
> I got some advice from AlexFeinman_MVP on the chat about
smartdevices today,
> but by the time I was able to try it out, I was unable to call any
of my > functions. I think it is that I am just unable to understand this area > because it has been thrown on me and I am just learning web
services. Can > you help shed some light.
> Thank you,
> Daryl
> <snip from chat>
> AlexFeinman_MVP : Q: How do I write a web service that uses a remote MTS
> component written in VB6 (using late binding)
> AlexFeinman_MVP : A: Use Dim t as Type =
> Type.GetFromProgID(componentProgID) to obtain a runtime type and
then > Activator.CreateInstance to create an instance of the component.
Once you > have an instance, use Type.InvokeMember to call methods.properties
by name > AlexFeinman_MVP : .
>
> "Rob Windsor [MVP]" <rw******@NO.MORE.SPAM.bigfoot.com> wrote in message > news:e5****************@TK2MSFTNGP12.phx.gbl...
> > Hi Daryl,
> >
> > .NET handles that for you! If you're using Visual Studio just go
to the > "Add
> > Reference" dialog and pick your VB 6 DLL from the list in the COM tab. > > Visual Studio will create a .NET DLL wrapper for you
automatically. > >
> > You you're not using VS then you need to use the tlbimp.exe
command line > > utility which is part of the .NET Framework SDK. See the link
below for > more
> > info on this utility
> >
> >
>
http://msdn.microsoft.com/library/de...rTlbimpexe.asp > >
> > --
> > Rob Windsor [MVP-VB]
> > G6 Consulting
> > Toronto, Canada
> >
> >
> > "Daryl Davis" <th***********@hotmail.com> wrote in message
> > news:O$**************@TK2MSFTNGP11.phx.gbl...
> > > What I want to do....
> > > is write a .net dll to call vb6 dll's so that i have it wrapped
so to > > speak.
> > > Daryl
> > >
> > > "Rob Windsor [MVP]" <rw******@NO.MORE.SPAM.bigfoot.com> wrote in
message
> > > news:em**************@TK2MSFTNGP10.phx.gbl...
> > > > You can use VB.NET (or C#) to create the equivalent to a VB 6
ActiveX
> > DLL
> > > > using COM Interop. These DLLs could be used by .NET apps or VB
(more > > > > specificaly COM) apps. NOTE: If you want to create a DLL in
VB.NET > that
> > > will
> > > > be used by a VB 6 front-end you will need to deploy the .NET
Framework
> > to
> > > > the machines that will use the DLL.
> > > >
> > > > --
> > > > Rob Windsor [MVP-VB]
> > > > G6 Consulting
> > > > Toronto, Canada
> > > >
> > > >
> > > > "Daryl Davis" <th***********@hotmail.com> wrote in message
> > > > news:Oe**************@tk2msftngp13.phx.gbl...
> > > > > Can I still write dll files in Visual basic.net?
> > > > >
> > > > >
> > > >
> > > >
> > >
> > >
> >
> >
>
>
sorry input = hallsales.saleTable2 is supposed to be
dim input as hallsales.saletable2
Daryl
"Daryl Davis" <th***********@hotmail.com> wrote in message
news:ua**************@TK2MSFTNGP09.phx.gbl... Rob,
Then my problem must be that I am trying from a web service, or I am
missing something very basic. When I try to early bind I get the error "
Cannot convert to 'Interface salesDO'.
"
SalesDO is the class on the dll I am trying to call.
and when I try late binding and try call I get "
Run-time exception thrown : System.NullReferenceException - Object
reference not set to an instance of an object.
"
My test code (usually typed out in command window but here for
example).... try
Dim trying as hallsales.salesdo
dim sale as object
trying = createobject("hallsales.salesdo","\\192.168.10.1")
sale = createobject("hallsales.salesdo","\\192.168.10.1")
input = hallsales.saleTable2
input.CreditAmt = 20
input.posStation = 9
input.UserID = 5
trying.sellfrompos(input,true)
sale.sellfrompos(input,true)
catch ex
end try
Do you have any ideas? I know I must be missing something small, but
important.
Daryl Davis
"Rob Windsor [MVP]" <rw******@NO.MORE.SPAM.bigfoot.com> wrote in message
news:Op**************@TK2MSFTNGP09.phx.gbl... You've kind of got the right idea. Let's look at two examples:
Ex A:
Dim obj As Object
obj = CreateObject("MyComp.MyClass", "MyServer")
Ex B:
Dim obj As MyComp.MyClass
obj = CreateObject("MyComp.MyClass", "MyServer")
The variable in Ex A is late bound. The compiler knows that it will
refer to an object but it has no idea what kind of object thus all calls to
methods or properties will be resolved at run time.
The variable in Ex B is early bound. The compiler knows it is refering
to an object of type MyClass and will use the metadata from the assembly
(which was generated from the type library of the COM component) to validate
all calls to methods or properties at compile time.
Hope this helps,
--
Rob Windsor [MVP-VB]
G6 Consulting
Toronto, Canada
"Daryl Davis" <th***********@hotmail.com> wrote in message
news:%2****************@TK2MSFTNGP11.phx.gbl... If I early bind a reference locally can I use it like this?
> Dim obj As Object
dim param1 as MyComp.MyClass.MyType
dim param2 as boolean = false
dim intReturn as integer
param1.int1 = 1
param1.string1 = "trial and error"
param1.int2 = 3
> obj = CreateObject("MyComp.MyClass", "MyServer")
> ' use object
intReturn = obj.myfunction(param1,param2)
> System.Runtime.InteropServices.Marshal.ReleaseComO bject(obj)
> obj = Nothing
>
> Note this code shows how to use the object late bound and requires
Option > Strict Off. You can do this early bound by setting a reference to
your > component and using a variable to the correct type, this would of course be
> preferred.
>
> Rob
>
>
>
> "Daryl Davis" <th***********@hotmail.com> wrote in message
> news:e9**************@tk2msftngp13.phx.gbl...
> > This is what I understand. What I don't understand is how I make the > > program go to the MTS server (another machine) for all the calls..
> > I got some advice from AlexFeinman_MVP on the chat about smartdevices > today,
> > but by the time I was able to try it out, I was unable to call any of my > > functions. I think it is that I am just unable to understand this
area > > because it has been thrown on me and I am just learning web
services. Can
> > you help shed some light.
> > Thank you,
> > Daryl
> > <snip from chat>
> > AlexFeinman_MVP : Q: How do I write a web service that uses a
remote > MTS
> > component written in VB6 (using late binding)
> > AlexFeinman_MVP : A: Use Dim t as Type =
> > Type.GetFromProgID(componentProgID) to obtain a runtime type and then > > Activator.CreateInstance to create an instance of the component. Once you
> > have an instance, use Type.InvokeMember to call methods.properties by name
> > AlexFeinman_MVP : .
> >
> > "Rob Windsor [MVP]" <rw******@NO.MORE.SPAM.bigfoot.com> wrote in
message > > news:e5****************@TK2MSFTNGP12.phx.gbl...
> > > Hi Daryl,
> > >
> > > .NET handles that for you! If you're using Visual Studio just go to the
> > "Add
> > > Reference" dialog and pick your VB 6 DLL from the list in the
COM tab. > > > Visual Studio will create a .NET DLL wrapper for you automatically. > > >
> > > You you're not using VS then you need to use the tlbimp.exe command line
> > > utility which is part of the .NET Framework SDK. See the link below for
> > more
> > > info on this utility
> > >
> > >
> >
>
http://msdn.microsoft.com/library/de...rTlbimpexe.asp > > >
> > > --
> > > Rob Windsor [MVP-VB]
> > > G6 Consulting
> > > Toronto, Canada
> > >
> > >
> > > "Daryl Davis" <th***********@hotmail.com> wrote in message
> > > news:O$**************@TK2MSFTNGP11.phx.gbl...
> > > > What I want to do....
> > > > is write a .net dll to call vb6 dll's so that i have it
wrapped so to
> > > speak.
> > > > Daryl
> > > >
> > > > "Rob Windsor [MVP]" <rw******@NO.MORE.SPAM.bigfoot.com> wrote
in > message
> > > > news:em**************@TK2MSFTNGP10.phx.gbl...
> > > > > You can use VB.NET (or C#) to create the equivalent to a VB
6 > ActiveX
> > > DLL
> > > > > using COM Interop. These DLLs could be used by .NET apps or
VB (more
> > > > > specificaly COM) apps. NOTE: If you want to create a DLL in
VB.NET > > that
> > > > will
> > > > > be used by a VB 6 front-end you will need to deploy the .NET
> Framework
> > > to
> > > > > the machines that will use the DLL.
> > > > >
> > > > > --
> > > > > Rob Windsor [MVP-VB]
> > > > > G6 Consulting
> > > > > Toronto, Canada
> > > > >
> > > > >
> > > > > "Daryl Davis" <th***********@hotmail.com> wrote in message
> > > > > news:Oe**************@tk2msftngp13.phx.gbl...
> > > > > > Can I still write dll files in Visual basic.net?
> > > > > >
> > > > > >
> > > > >
> > > > >
> > > >
> > > >
> > >
> > >
> >
> >
>
>
Hi Daryl,
Sorry, I'm out of ideas. I'd guess it was a security issue but the error
messages you're getting don't point to that.
The last thing I would suggest is to create a small VB 6 test app that calls
your component, get that working then copy the code over to a test VB.NET
app and get that working (it should without any changes). Once your sure
that you can access your component using a windows app then you can narrow
down the possible problems.
Rob
"Daryl Davis" <th***********@hotmail.com> wrote in message
news:ua**************@TK2MSFTNGP09.phx.gbl... Rob,
Then my problem must be that I am trying from a web service, or I am
missing something very basic. When I try to early bind I get the error "
Cannot convert to 'Interface salesDO'.
"
SalesDO is the class on the dll I am trying to call.
and when I try late binding and try call I get "
Run-time exception thrown : System.NullReferenceException - Object
reference not set to an instance of an object.
"
My test code (usually typed out in command window but here for
example).... try
Dim trying as hallsales.salesdo
dim sale as object
trying = createobject("hallsales.salesdo","\\192.168.10.1")
sale = createobject("hallsales.salesdo","\\192.168.10.1")
input = hallsales.saleTable2
input.CreditAmt = 20
input.posStation = 9
input.UserID = 5
trying.sellfrompos(input,true)
sale.sellfrompos(input,true)
catch ex
end try
Do you have any ideas? I know I must be missing something small, but
important.
Daryl Davis
"Rob Windsor [MVP]" <rw******@NO.MORE.SPAM.bigfoot.com> wrote in message
news:Op**************@TK2MSFTNGP09.phx.gbl... You've kind of got the right idea. Let's look at two examples:
Ex A:
Dim obj As Object
obj = CreateObject("MyComp.MyClass", "MyServer")
Ex B:
Dim obj As MyComp.MyClass
obj = CreateObject("MyComp.MyClass", "MyServer")
The variable in Ex A is late bound. The compiler knows that it will
refer to an object but it has no idea what kind of object thus all calls to
methods or properties will be resolved at run time.
The variable in Ex B is early bound. The compiler knows it is refering
to an object of type MyClass and will use the metadata from the assembly
(which was generated from the type library of the COM component) to validate
all calls to methods or properties at compile time.
Hope this helps,
--
Rob Windsor [MVP-VB]
G6 Consulting
Toronto, Canada
"Daryl Davis" <th***********@hotmail.com> wrote in message
news:%2****************@TK2MSFTNGP11.phx.gbl... If I early bind a reference locally can I use it like this?
> Dim obj As Object
dim param1 as MyComp.MyClass.MyType
dim param2 as boolean = false
dim intReturn as integer
param1.int1 = 1
param1.string1 = "trial and error"
param1.int2 = 3
> obj = CreateObject("MyComp.MyClass", "MyServer")
> ' use object
intReturn = obj.myfunction(param1,param2)
> System.Runtime.InteropServices.Marshal.ReleaseComO bject(obj)
> obj = Nothing
>
> Note this code shows how to use the object late bound and requires
Option > Strict Off. You can do this early bound by setting a reference to
your > component and using a variable to the correct type, this would of course be
> preferred.
>
> Rob
>
>
>
> "Daryl Davis" <th***********@hotmail.com> wrote in message
> news:e9**************@tk2msftngp13.phx.gbl...
> > This is what I understand. What I don't understand is how I make the > > program go to the MTS server (another machine) for all the calls..
> > I got some advice from AlexFeinman_MVP on the chat about smartdevices > today,
> > but by the time I was able to try it out, I was unable to call any of my > > functions. I think it is that I am just unable to understand this
area > > because it has been thrown on me and I am just learning web
services. Can
> > you help shed some light.
> > Thank you,
> > Daryl
> > <snip from chat>
> > AlexFeinman_MVP : Q: How do I write a web service that uses a
remote > MTS
> > component written in VB6 (using late binding)
> > AlexFeinman_MVP : A: Use Dim t as Type =
> > Type.GetFromProgID(componentProgID) to obtain a runtime type and then > > Activator.CreateInstance to create an instance of the component. Once you
> > have an instance, use Type.InvokeMember to call methods.properties by name
> > AlexFeinman_MVP : .
> >
> > "Rob Windsor [MVP]" <rw******@NO.MORE.SPAM.bigfoot.com> wrote in
message > > news:e5****************@TK2MSFTNGP12.phx.gbl...
> > > Hi Daryl,
> > >
> > > .NET handles that for you! If you're using Visual Studio just go to the
> > "Add
> > > Reference" dialog and pick your VB 6 DLL from the list in the
COM tab. > > > Visual Studio will create a .NET DLL wrapper for you automatically. > > >
> > > You you're not using VS then you need to use the tlbimp.exe command line
> > > utility which is part of the .NET Framework SDK. See the link below for
> > more
> > > info on this utility
> > >
> > >
> >
>
http://msdn.microsoft.com/library/de...rTlbimpexe.asp > > >
> > > --
> > > Rob Windsor [MVP-VB]
> > > G6 Consulting
> > > Toronto, Canada
> > >
> > >
> > > "Daryl Davis" <th***********@hotmail.com> wrote in message
> > > news:O$**************@TK2MSFTNGP11.phx.gbl...
> > > > What I want to do....
> > > > is write a .net dll to call vb6 dll's so that i have it
wrapped so to
> > > speak.
> > > > Daryl
> > > >
> > > > "Rob Windsor [MVP]" <rw******@NO.MORE.SPAM.bigfoot.com> wrote
in > message
> > > > news:em**************@TK2MSFTNGP10.phx.gbl...
> > > > > You can use VB.NET (or C#) to create the equivalent to a VB
6 > ActiveX
> > > DLL
> > > > > using COM Interop. These DLLs could be used by .NET apps or
VB (more
> > > > > specificaly COM) apps. NOTE: If you want to create a DLL in
VB.NET > > that
> > > > will
> > > > > be used by a VB 6 front-end you will need to deploy the .NET
> Framework
> > > to
> > > > > the machines that will use the DLL.
> > > > >
> > > > > --
> > > > > Rob Windsor [MVP-VB]
> > > > > G6 Consulting
> > > > > Toronto, Canada
> > > > >
> > > > >
> > > > > "Daryl Davis" <th***********@hotmail.com> wrote in message
> > > > > news:Oe**************@tk2msftngp13.phx.gbl...
> > > > > > Can I still write dll files in Visual basic.net?
> > > > > >
> > > > > >
> > > > >
> > > > >
> > > >
> > > >
> > >
> > >
> >
> >
>
>
Thanks Rob.
I appreciate all your help. Hopefully someone in the webservice group can
help me then.
Daryl
"Rob Windsor [MVP]" <rw******@NO.MORE.SPAM.bigfoot.com> wrote in message
news:ej**************@tk2msftngp13.phx.gbl... Hi Daryl,
Sorry, I'm out of ideas. I'd guess it was a security issue but the error
messages you're getting don't point to that.
The last thing I would suggest is to create a small VB 6 test app that
calls your component, get that working then copy the code over to a test VB.NET
app and get that working (it should without any changes). Once your sure
that you can access your component using a windows app then you can narrow
down the possible problems.
Rob
"Daryl Davis" <th***********@hotmail.com> wrote in message
news:ua**************@TK2MSFTNGP09.phx.gbl... Rob,
Then my problem must be that I am trying from a web service, or I am missing something very basic. When I try to early bind I get the error "
Cannot convert to 'Interface salesDO'.
"
SalesDO is the class on the dll I am trying to call.
and when I try late binding and try call I get "
Run-time exception thrown : System.NullReferenceException - Object
reference not set to an instance of an object.
"
My test code (usually typed out in command window but here for
example).... try
Dim trying as hallsales.salesdo
dim sale as object
trying = createobject("hallsales.salesdo","\\192.168.10.1")
sale = createobject("hallsales.salesdo","\\192.168.10.1")
input = hallsales.saleTable2
input.CreditAmt = 20
input.posStation = 9
input.UserID = 5
trying.sellfrompos(input,true)
sale.sellfrompos(input,true)
catch ex
end try
Do you have any ideas? I know I must be missing something small, but
important.
Daryl Davis
"Rob Windsor [MVP]" <rw******@NO.MORE.SPAM.bigfoot.com> wrote in message
news:Op**************@TK2MSFTNGP09.phx.gbl... You've kind of got the right idea. Let's look at two examples:
Ex A:
Dim obj As Object
obj = CreateObject("MyComp.MyClass", "MyServer")
Ex B:
Dim obj As MyComp.MyClass
obj = CreateObject("MyComp.MyClass", "MyServer")
The variable in Ex A is late bound. The compiler knows that it will refer to an object but it has no idea what kind of object thus all calls to methods or properties will be resolved at run time.
The variable in Ex B is early bound. The compiler knows it is refering to an object of type MyClass and will use the metadata from the assembly
(which was generated from the type library of the COM component) to validate all calls to methods or properties at compile time.
Hope this helps,
--
Rob Windsor [MVP-VB]
G6 Consulting
Toronto, Canada
"Daryl Davis" <th***********@hotmail.com> wrote in message
news:%2****************@TK2MSFTNGP11.phx.gbl...
> If I early bind a reference locally can I use it like this?
>
> > Dim obj As Object
> dim param1 as MyComp.MyClass.MyType
> dim param2 as boolean = false
> dim intReturn as integer
>
> param1.int1 = 1
> param1.string1 = "trial and error"
> param1.int2 = 3
>
> > obj = CreateObject("MyComp.MyClass", "MyServer")
> > ' use object
> intReturn = obj.myfunction(param1,param2)
> > System.Runtime.InteropServices.Marshal.ReleaseComO bject(obj)
> > obj = Nothing
> >
> > Note this code shows how to use the object late bound and requires
Option
> > Strict Off. You can do this early bound by setting a reference to your > > component and using a variable to the correct type, this would of
course > be
> > preferred.
> >
> > Rob
> >
> >
> >
> > "Daryl Davis" <th***********@hotmail.com> wrote in message
> > news:e9**************@tk2msftngp13.phx.gbl...
> > > This is what I understand. What I don't understand is how I
make the > > > program go to the MTS server (another machine) for all the
calls.. > > > I got some advice from AlexFeinman_MVP on the chat about
smartdevices > > today,
> > > but by the time I was able to try it out, I was unable to call
any of my
> > > functions. I think it is that I am just unable to understand
this area
> > > because it has been thrown on me and I am just learning web
services. > Can
> > > you help shed some light.
> > > Thank you,
> > > Daryl
> > > <snip from chat>
> > > AlexFeinman_MVP : Q: How do I write a web service that uses a
remote
> > MTS
> > > component written in VB6 (using late binding)
> > > AlexFeinman_MVP : A: Use Dim t as Type =
> > > Type.GetFromProgID(componentProgID) to obtain a runtime type and
then > > > Activator.CreateInstance to create an instance of the component.
Once > you
> > > have an instance, use Type.InvokeMember to call
methods.properties by > name
> > > AlexFeinman_MVP : .
> > >
> > > "Rob Windsor [MVP]" <rw******@NO.MORE.SPAM.bigfoot.com> wrote in
message
> > > news:e5****************@TK2MSFTNGP12.phx.gbl...
> > > > Hi Daryl,
> > > >
> > > > .NET handles that for you! If you're using Visual Studio just
go to > the
> > > "Add
> > > > Reference" dialog and pick your VB 6 DLL from the list in the
COM tab.
> > > > Visual Studio will create a .NET DLL wrapper for you
automatically. > > > >
> > > > You you're not using VS then you need to use the tlbimp.exe
command > line
> > > > utility which is part of the .NET Framework SDK. See the link
below > for
> > > more
> > > > info on this utility
> > > >
> > > >
> > >
> >
>
http://msdn.microsoft.com/library/de...rTlbimpexe.asp > > > >
> > > > --
> > > > Rob Windsor [MVP-VB]
> > > > G6 Consulting
> > > > Toronto, Canada
> > > >
> > > >
> > > > "Daryl Davis" <th***********@hotmail.com> wrote in message
> > > > news:O$**************@TK2MSFTNGP11.phx.gbl...
> > > > > What I want to do....
> > > > > is write a .net dll to call vb6 dll's so that i have it wrapped so > to
> > > > speak.
> > > > > Daryl
> > > > >
> > > > > "Rob Windsor [MVP]" <rw******@NO.MORE.SPAM.bigfoot.com>
wrote in > > message
> > > > > news:em**************@TK2MSFTNGP10.phx.gbl...
> > > > > > You can use VB.NET (or C#) to create the equivalent to a
VB 6 > > ActiveX
> > > > DLL
> > > > > > using COM Interop. These DLLs could be used by .NET apps
or VB > (more
> > > > > > specificaly COM) apps. NOTE: If you want to create a DLL
in VB.NET
> > > that
> > > > > will
> > > > > > be used by a VB 6 front-end you will need to deploy the
..NET > > Framework
> > > > to
> > > > > > the machines that will use the DLL.
> > > > > >
> > > > > > --
> > > > > > Rob Windsor [MVP-VB]
> > > > > > G6 Consulting
> > > > > > Toronto, Canada
> > > > > >
> > > > > >
> > > > > > "Daryl Davis" <th***********@hotmail.com> wrote in message
> > > > > > news:Oe**************@tk2msftngp13.phx.gbl...
> > > > > > > Can I still write dll files in Visual basic.net?
> > > > > > >
> > > > > > >
> > > > > >
> > > > > >
> > > > >
> > > > >
> > > >
> > > >
> > >
> > >
> >
> >
>
>
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