COM problem - Visual Basic .NET

Martinez

Hello
I try declare

Dim db as New BtDatabase()
and execute metod
db.open(par1,par2,par3)

but i get error :

System.NullReferenceException was unhandled
Message="Object reference not set to an instance of an object."
Source="Microsoft.VisualBasic"
StackTrace:
at
Microsoft.VisualBasic.CompilerServices.LateBinding .InternalLateCall(Object
o, Type objType, String name, Object[] args, String[] paramnames,
Boolean[] CopyBack, Boolean IgnoreReturn)
at
Microsoft.VisualBasic.CompilerServices.NewLateBind ing.LateCall(Object
Instance, Type Type, String MemberName, Object[] Arguments, String[]
ArgumentNames, Type[] TypeArguments, Boolean[] CopyBack, Boolean
IgnoreReturn)
at ForteWB.WczytywanieWyciagu.WczytywanieWyciagu_Load (Object
sender, EventArgs e) in C:\Documents and Settings\Marcin\Moje dokumenty
\Visual Studio 2005\Projects\ForteWB\ForteWB
\WczytywanieWyciagu.vb:line 210
at System.EventHandler.Invoke(Object sender, EventArgs e)
at System.Windows.Forms.Form.OnLoad(EventArgs e)
at System.Windows.Forms.Form.OnCreateControl()
at System.Windows.Forms.Control.CreateControl(Boolean
fIgnoreVisible)
at System.Windows.Forms.Control.CreateControl()
at System.Windows.Forms.Control.WmShowWindow(Message& m)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ScrollableControl.WndProc(Mes sage& m)
at System.Windows.Forms.ContainerControl.WndProc(Mess age& m)
at System.Windows.Forms.Form.WmShowWindow(Message& m)
at System.Windows.Forms.Form.WndProc(Message& m)
at
System.Windows.Forms.Control.ControlNativeWindow.O nMessage(Message& m)
at
System.Windows.Forms.Control.ControlNativeWindow.W ndProc(Message& m)
at System.Windows.Forms.NativeWindow.DebuggableCallba ck(IntPtr
hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
at
System.Windows.Forms.UnsafeNativeMethods.SendMessa ge(HandleRef hWnd,
Int32 msg, Int32 wParam, Int32 lParam)
at System.Windows.Forms.Form.SetVisibleCore(Boolean value)
at System.Windows.Forms.Control.set_Visible(Boolean value)
at
System.Windows.Forms.Application.ThreadContext.Run MessageLoopInner(Int32
reason, ApplicationContext context)
at
System.Windows.Forms.Application.ThreadContext.Run MessageLoop(Int32
reason, ApplicationContext context)
at System.Windows.Forms.Application.Run(ApplicationCo ntext
context)
at
Microsoft.VisualBasic.ApplicationServices.WindowsF ormsApplicationBase.OnRun()
at
Microsoft.VisualBasic.ApplicationServices.WindowsF ormsApplicationBase.DoApplicationModel()
at
Microsoft.VisualBasic.ApplicationServices.WindowsF ormsApplicationBase.Run(String[]
commandLine)
at ForteWB.My.MyApplication.Main(String[] Args) in 17d14f5c-
a337-4978-8281-53493378c1071.vb:line 81
at System.AppDomain.nExecuteAssembly(Assembly assembly,
String[] args)
at System.Runtime.Hosting.ManifestRunner.Run(Boolean
checkAptModel)
at System.Runtime.Hosting.ManifestRunner.ExecuteAsAss embly()
at
System.Runtime.Hosting.ApplicationActivator.Create Instance(ActivationContext
activationContext, String[] activationCustomData)
at
System.Runtime.Hosting.ApplicationActivator.Create Instance(ActivationContext
activationContext)
at
Microsoft.VisualStudio.HostingProcess.HostProc.Run UsersAssemblyDebugInZone()
at System.Threading.ThreadHelper.ThreadStart_Context( Object
state)
at System.Threading.ExecutionContext.Run(ExecutionCon text
executionContext, ContextCallback callback, Object state)
at System.Threading.ThreadHelper.ThreadStart()
Why i can't execute metod open on object db??

Marcin

Apr 29 '07 #1

Subscribe Post Reply

1707

Cor Ligthert [MVP]

Hi Marcin,

Probably in par1, par2, par3 has an object to be instanced what is not done.

However for not AdoNet databases the newsgroup

micorosoft.public.ado.data is probably much better,

Cor
"Martinez" <ma******@szczecinek.net.plschreef in bericht
news:11**********************@y80g2000hsf.googlegr oups.com...

Hello
I try declare

Dim db as New BtDatabase()
and execute metod
db.open(par1,par2,par3)

but i get error :

System.NullReferenceException was unhandled
Message="Object reference not set to an instance of an object."
Source="Microsoft.VisualBasic"
StackTrace:
at
Microsoft.VisualBasic.CompilerServices.LateBinding .InternalLateCall(Object
o, Type objType, String name, Object[] args, String[] paramnames,
Boolean[] CopyBack, Boolean IgnoreReturn)
at
Microsoft.VisualBasic.CompilerServices.NewLateBind ing.LateCall(Object
Instance, Type Type, String MemberName, Object[] Arguments, String[]
ArgumentNames, Type[] TypeArguments, Boolean[] CopyBack, Boolean
IgnoreReturn)
at ForteWB.WczytywanieWyciagu.WczytywanieWyciagu_Load (Object
sender, EventArgs e) in C:\Documents and Settings\Marcin\Moje dokumenty
\Visual Studio 2005\Projects\ForteWB\ForteWB
\WczytywanieWyciagu.vb:line 210
at System.EventHandler.Invoke(Object sender, EventArgs e)
at System.Windows.Forms.Form.OnLoad(EventArgs e)
at System.Windows.Forms.Form.OnCreateControl()
at System.Windows.Forms.Control.CreateControl(Boolean
fIgnoreVisible)
at System.Windows.Forms.Control.CreateControl()
at System.Windows.Forms.Control.WmShowWindow(Message& m)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ScrollableControl.WndProc(Mes sage& m)
at System.Windows.Forms.ContainerControl.WndProc(Mess age& m)
at System.Windows.Forms.Form.WmShowWindow(Message& m)
at System.Windows.Forms.Form.WndProc(Message& m)
at
System.Windows.Forms.Control.ControlNativeWindow.O nMessage(Message& m)
at
System.Windows.Forms.Control.ControlNativeWindow.W ndProc(Message& m)
at System.Windows.Forms.NativeWindow.DebuggableCallba ck(IntPtr
hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
at
System.Windows.Forms.UnsafeNativeMethods.SendMessa ge(HandleRef hWnd,
Int32 msg, Int32 wParam, Int32 lParam)
at System.Windows.Forms.Form.SetVisibleCore(Boolean value)
at System.Windows.Forms.Control.set_Visible(Boolean value)
at
System.Windows.Forms.Application.ThreadContext.Run MessageLoopInner(Int32
reason, ApplicationContext context)
at
System.Windows.Forms.Application.ThreadContext.Run MessageLoop(Int32
reason, ApplicationContext context)
at System.Windows.Forms.Application.Run(ApplicationCo ntext
context)
at
Microsoft.VisualBasic.ApplicationServices.WindowsF ormsApplicationBase.OnRun()
at
Microsoft.VisualBasic.ApplicationServices.WindowsF ormsApplicationBase.DoApplicationModel()
at
Microsoft.VisualBasic.ApplicationServices.WindowsF ormsApplicationBase.Run(String[]
commandLine)
at ForteWB.My.MyApplication.Main(String[] Args) in 17d14f5c-
a337-4978-8281-53493378c1071.vb:line 81
at System.AppDomain.nExecuteAssembly(Assembly assembly,
String[] args)
at System.Runtime.Hosting.ManifestRunner.Run(Boolean
checkAptModel)
at System.Runtime.Hosting.ManifestRunner.ExecuteAsAss embly()
at
System.Runtime.Hosting.ApplicationActivator.Create Instance(ActivationContext
activationContext, String[] activationCustomData)
at
System.Runtime.Hosting.ApplicationActivator.Create Instance(ActivationContext
activationContext)
at
Microsoft.VisualStudio.HostingProcess.HostProc.Run UsersAssemblyDebugInZone()
at System.Threading.ThreadHelper.ThreadStart_Context( Object
state)
at System.Threading.ExecutionContext.Run(ExecutionCon text
executionContext, ContextCallback callback, Object state)
at System.Threading.ThreadHelper.ThreadStart()
Why i can't execute metod open on object db??

Marcin

Apr 30 '07 #2

Martinez

On 30 Kwi, 06:12, "Cor Ligthert [MVP]" <notmyfirstn...@planet.nl>
wrote:

Hi Marcin,

Probably in par1, par2, par3 has an object to be instanced what is not done.

However for not AdoNet databases the newsgroup

micorosoft.public.ado.data is probably much better,

Cor

"Martinez" <marti...@szczecinek.net.plschreef in berichtnews:1177877720..09***********@y80g2000hsf. googlegroups.com...

Hello
I try declare

Dim db as New BtDatabase()
and execute metod
db.open(par1,par2,par3)

but i get error :

System.NullReferenceException was unhandled
Message="Object reference not set to an instance of an object."
Source="Microsoft.VisualBasic"
StackTrace:
at
Microsoft.VisualBasic.CompilerServices.LateBinding .InternalLateCall(Object
o, Type objType, String name, Object[] args, String[] paramnames,
Boolean[] CopyBack, Boolean IgnoreReturn)
at
Microsoft.VisualBasic.CompilerServices.NewLateBind ing.LateCall(Object
Instance, Type Type, String MemberName, Object[] Arguments, String[]
ArgumentNames, Type[] TypeArguments, Boolean[] CopyBack, Boolean
IgnoreReturn)
at ForteWB.WczytywanieWyciagu.WczytywanieWyciagu_Load (Object
sender, EventArgs e) in C:\Documents and Settings\Marcin\Moje dokumenty
\Visual Studio 2005\Projects\ForteWB\ForteWB
\WczytywanieWyciagu.vb:line 210
at System.EventHandler.Invoke(Object sender, EventArgs e)
at System.Windows.Forms.Form.OnLoad(EventArgs e)
at System.Windows.Forms.Form.OnCreateControl()
at System.Windows.Forms.Control.CreateControl(Boolean
fIgnoreVisible)
at System.Windows.Forms.Control.CreateControl()
at System.Windows.Forms.Control.WmShowWindow(Message& m)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ScrollableControl.WndProc(Mes sage& m)
at System.Windows.Forms.ContainerControl.WndProc(Mess age& m)
at System.Windows.Forms.Form.WmShowWindow(Message& m)
at System.Windows.Forms.Form.WndProc(Message& m)
at
System.Windows.Forms.Control.ControlNativeWindow.O nMessage(Message& m)
at
System.Windows.Forms.Control.ControlNativeWindow.W ndProc(Message& m)
at System.Windows.Forms.NativeWindow.DebuggableCallba ck(IntPtr
hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
at
System.Windows.Forms.UnsafeNativeMethods.SendMessa ge(HandleRef hWnd,
Int32 msg, Int32 wParam, Int32 lParam)
at System.Windows.Forms.Form.SetVisibleCore(Boolean value)
at System.Windows.Forms.Control.set_Visible(Boolean value)
at
System.Windows.Forms.Application.ThreadContext.Run MessageLoopInner(Int32
reason, ApplicationContext context)
at
System.Windows.Forms.Application.ThreadContext.Run MessageLoop(Int32
reason, ApplicationContext context)
at System.Windows.Forms.Application.Run(ApplicationCo ntext
context)
at
Microsoft.VisualBasic.ApplicationServices.WindowsF ormsApplicationBase.OnRun*()
at
Microsoft.VisualBasic.ApplicationServices.WindowsF ormsApplicationBase.DoApp*licationModel()
at
Microsoft.VisualBasic.ApplicationServices.WindowsF ormsApplicationBase.Run(S*tring[]
commandLine)
at ForteWB.My.MyApplication.Main(String[] Args) in 17d14f5c-
a337-4978-8281-53493378c1071.vb:line 81
at System.AppDomain.nExecuteAssembly(Assembly assembly,
String[] args)
at System.Runtime.Hosting.ManifestRunner.Run(Boolean
checkAptModel)
at System.Runtime.Hosting.ManifestRunner.ExecuteAsAss embly()
at
System.Runtime.Hosting.ApplicationActivator.Create Instance(ActivationContex*t
activationContext, String[] activationCustomData)
at
System.Runtime.Hosting.ApplicationActivator.Create Instance(ActivationContex*t
activationContext)
at
Microsoft.VisualStudio.HostingProcess.HostProc.Run UsersAssemblyDebugInZone(*)
at System.Threading.ThreadHelper.ThreadStart_Context( Object
state)
at System.Threading.ExecutionContext.Run(ExecutionCon text
executionContext, ContextCallback callback, Object state)
at System.Threading.ThreadHelper.ThreadStart()

Why i can't execute metod open on object db??

Marcin- Ukryj cytowany tekst -

- Poka¿ cytowany tekst -

Ok, but par1,par2,par3 is string.
par1="Driver=...;Server=...;Database=...;"
par2="user"
par3="password"

I add db to watch and od i

Apr 30 '07 #3

Cor Ligthert [MVP]

Martinez,

I have the idea that the problem as nothing to do with the commands

Dim db as New BtDatabase()
db.open(par1,par2,par3)

Can you outcomment them and run again?

Cor
"Martinez" <ma******@szczecinek.net.plschreef in bericht
news:11**********************@y80g2000hsf.googlegr oups.com...
On 30 Kwi, 06:12, "Cor Ligthert [MVP]" <notmyfirstn...@planet.nl>
wrote:

Hi Marcin,

Probably in par1, par2, par3 has an object to be instanced what is not
done.

However for not AdoNet databases the newsgroup

micorosoft.public.ado.data is probably much better,

Cor

"Martinez" <marti...@szczecinek.net.plschreef in
berichtnews:11**********************@y80g2000hsf.g ooglegroups.com...

Hello
I try declare

Dim db as New BtDatabase()
and execute metod
db.open(par1,par2,par3)

but i get error :

System.NullReferenceException was unhandled
Message="Object reference not set to an instance of an object."
Source="Microsoft.VisualBasic"
StackTrace:
at
Microsoft.VisualBasic.CompilerServices.LateBinding .InternalLateCall(Object
o, Type objType, String name, Object[] args, String[] paramnames,
Boolean[] CopyBack, Boolean IgnoreReturn)
at
Microsoft.VisualBasic.CompilerServices.NewLateBind ing.LateCall(Object
Instance, Type Type, String MemberName, Object[] Arguments, String[]
ArgumentNames, Type[] TypeArguments, Boolean[] CopyBack, Boolean
IgnoreReturn)
at ForteWB.WczytywanieWyciagu.WczytywanieWyciagu_Load (Object
sender, EventArgs e) in C:\Documents and Settings\Marcin\Moje dokumenty
\Visual Studio 2005\Projects\ForteWB\ForteWB
\WczytywanieWyciagu.vb:line 210
at System.EventHandler.Invoke(Object sender, EventArgs e)
at System.Windows.Forms.Form.OnLoad(EventArgs e)
at System.Windows.Forms.Form.OnCreateControl()
at System.Windows.Forms.Control.CreateControl(Boolean
fIgnoreVisible)
at System.Windows.Forms.Control.CreateControl()
at System.Windows.Forms.Control.WmShowWindow(Message& m)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ScrollableControl.WndProc(Mes sage& m)
at System.Windows.Forms.ContainerControl.WndProc(Mess age& m)
at System.Windows.Forms.Form.WmShowWindow(Message& m)
at System.Windows.Forms.Form.WndProc(Message& m)
at
System.Windows.Forms.Control.ControlNativeWindow.O nMessage(Message& m)
at
System.Windows.Forms.Control.ControlNativeWindow.W ndProc(Message& m)
at System.Windows.Forms.NativeWindow.DebuggableCallba ck(IntPtr
hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
at
System.Windows.Forms.UnsafeNativeMethods.SendMessa ge(HandleRef hWnd,
Int32 msg, Int32 wParam, Int32 lParam)
at System.Windows.Forms.Form.SetVisibleCore(Boolean value)
at System.Windows.Forms.Control.set_Visible(Boolean value)
at
System.Windows.Forms.Application.ThreadContext.Run MessageLoopInner(Int32
reason, ApplicationContext context)
at
System.Windows.Forms.Application.ThreadContext.Run MessageLoop(Int32
reason, ApplicationContext context)
at System.Windows.Forms.Application.Run(ApplicationCo ntext
context)
at
Microsoft.VisualBasic.ApplicationServices.WindowsF ormsApplicationBase.OnRun*()
at
Microsoft.VisualBasic.ApplicationServices.WindowsF ormsApplicationBase.DoApp*licationModel()
at
Microsoft.VisualBasic.ApplicationServices.WindowsF ormsApplicationBase.Run(S*tring[]
commandLine)
at ForteWB.My.MyApplication.Main(String[] Args) in 17d14f5c-
a337-4978-8281-53493378c1071.vb:line 81
at System.AppDomain.nExecuteAssembly(Assembly assembly,
String[] args)
at System.Runtime.Hosting.ManifestRunner.Run(Boolean
checkAptModel)
at System.Runtime.Hosting.ManifestRunner.ExecuteAsAss embly()
at
System.Runtime.Hosting.ApplicationActivator.Create Instance(ActivationContex*t
activationContext, String[] activationCustomData)
at
System.Runtime.Hosting.ApplicationActivator.Create Instance(ActivationContex*t
activationContext)
at
Microsoft.VisualStudio.HostingProcess.HostProc.Run UsersAssemblyDebugInZone(*)
at System.Threading.ThreadHelper.ThreadStart_Context( Object
state)
at System.Threading.ExecutionContext.Run(ExecutionCon text
executionContext, ContextCallback callback, Object state)
at System.Threading.ThreadHelper.ThreadStart()

Why i can't execute metod open on object db??

Marcin- Ukryj cytowany tekst -

- Poka¿ cytowany tekst -

Ok, but par1,par2,par3 is string.
par1="Driver=...;Server=...;Database=...;"
par2="user"
par3="password"

I add db to watch and od i

Apr 30 '07 #4

Martinez

On 30 Kwi, 10:21, "Cor Ligthert [MVP]" <notmyfirstn...@planet.nl>
wrote:

Martinez,

I have the idea that the problem as nothing to do with the commands

Dim db as New BtDatabase()
db.open(par1,par2,par3)

Can you outcomment them and run again?

Cor

I don't understand, can you explain me that ??

Marcin

Apr 30 '07 #5

Cor Ligthert [MVP]

-Dim db as New BtDatabase()
-db.open(par1,par2,par3)

"Martinez" <ma******@szczecinek.net.plschreef in bericht
news:11**********************@q75g2000hsh.googlegr oups.com...

On 30 Kwi, 10:21, "Cor Ligthert [MVP]" <notmyfirstn...@planet.nl>
wrote:
>Martinez,

I have the idea that the problem as nothing to do with the commands

Dim db as New BtDatabase()
db.open(par1,par2,par3)

Can you outcomment them and run again?

Cor

I don't understand, can you explain me that ??

Marcin

Apr 30 '07 #6

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