Referencing unmanaged ActiveX control methods in C#

[Michiel]

Hello,

I have an ActiveX control which I can call fine from HTML pages, using the
object tag like <OBJECT ID="UserControl 1" WIDTH="0" HEIGHT="0"
CLASSID="CLSID: 85A5119D-0000-0000-0000-5467CB71943E" CODEBASE =
http://mywebsite/MyActiveX.ocx#Version=1,1,0,0 VIEWASTEXT></OBJECT>

, and then simply adding them to the object's id with a . like

UserControl1.My Function()

in JavaScript.
But how do I do this from C# ?

I can't reference to the file directly (Visual Studio says "not a valid COM
component") so I figure I have to use something like

[ComImport, Guid("85A5119D-0000-0000-0000-5467CB71943E"), TypeLibType(416 0)]
public class MyActiveX
{
[PreserveSig, MethodImpl(Meth odImplOptions.I nternalCall,
MethodCodeType= MethodCodeType. Runtime)]
public virtual extern int MyFunction();
}
And then calling it like

MyActiveX oAX=new MyActiveX();
oAX.MyFunction( );

However, this gives me an ExecutionEngine Exception at the last line.

Thanks for any clues !

Michiel.

[Ollie Riches]

why not generate an interop assembly using the type library importer if you
have access to the original COM type library

http://msdn.microsoft.com/library/de...assemblies.asp

HTH

Ollie Riches
"Michiel" <mi*********@RE CLAMEpayvision. com> wrote in message
news:ul******** *****@TK2MSFTNG P11.phx.gbl...

Hello,

I have an ActiveX control which I can call fine from HTML pages, using the
object tag like <OBJECT ID="UserControl 1" WIDTH="0" HEIGHT="0"
CLASSID="CLSID: 85A5119D-0000-0000-0000-5467CB71943E" CODEBASE =
http://mywebsite/MyActiveX.ocx#Version=1,1,0,0 VIEWASTEXT></OBJECT>

, and then simply adding them to the object's id with a . like

UserControl1.My Function()

in JavaScript.
But how do I do this from C# ?

I can't reference to the file directly (Visual Studio says "not a valid
COM component") so I figure I have to use something like

[ComImport, Guid("85A5119D-0000-0000-0000-5467CB71943E"),
TypeLibType(416 0)]
public class MyActiveX
{
[PreserveSig, MethodImpl(Meth odImplOptions.I nternalCall,
MethodCodeType= MethodCodeType. Runtime)]
public virtual extern int MyFunction();
}
And then calling it like

MyActiveX oAX=new MyActiveX();
oAX.MyFunction( );

However, this gives me an ExecutionEngine Exception at the last line.

Thanks for any clues !

Michiel.

[Michiel]

Hi Ollie, thanks for your reply !

The ActiveX control doesn't have a .tlb file, is it possible to generate
this somehow ?

I have the ActiveX source, but I'm not an expert on it (it's written by
someone else).

If I use the ActiveX on the website, it somehow calls the GetIDsOfNames
function (member of IDispatch) which it passes the method's name via it's
second parameter (LPOLESTR *rgszNames) which is then translated to an
internal ActiveX function by the ActiveX.

So somehow I have to let it automatically call this GetIDsOfNames function
just like IE does I think ?

Michiel.

"Ollie Riches" <ol**********@p honeanalyser.ne t> wrote in message
news:O6******** ******@TK2MSFTN GP14.phx.gbl...

why not generate an interop assembly using the type library importer if
you have access to the original COM type library

http://msdn.microsoft.com/library/de...assemblies.asp

HTH

Ollie Riches
"Michiel" <mi*********@RE CLAMEpayvision. com> wrote in message
news:ul******** *****@TK2MSFTNG P11.phx.gbl...

Hello,

I have an ActiveX control which I can call fine from HTML pages, using
the object tag like <OBJECT ID="UserControl 1" WIDTH="0" HEIGHT="0"
CLASSID="CLSID: 85A5119D-0000-0000-0000-5467CB71943E" CODEBASE =
http://mywebsite/MyActiveX.ocx#Version=1,1,0,0 VIEWASTEXT></OBJECT>

, and then simply adding them to the object's id with a . like

UserControl1.My Function()

in JavaScript.
But how do I do this from C# ?

I can't reference to the file directly (Visual Studio says "not a valid
COM component") so I figure I have to use something like

[ComImport, Guid("85A5119D-0000-0000-0000-5467CB71943E"),
TypeLibType(416 0)]
public class MyActiveX
{
[PreserveSig, MethodImpl(Meth odImplOptions.I nternalCall,
MethodCodeType= MethodCodeType. Runtime)]
public virtual extern int MyFunction();
}
And then calling it like

MyActiveX oAX=new MyActiveX();
oAX.MyFunction( );

However, this gives me an ExecutionEngine Exception at the last line.

Thanks for any clues !

Michiel.

[Ollie Riches]

if you have the dll\ocx for the active x control you can run tlbimp against
that, I guess that the tlb might be embedded into the dll\ocx.

Ollie

"Michiel" <mi*********@RE CLAMEpayvision. com> wrote in message
news:Oi******** ******@TK2MSFTN GP12.phx.gbl...

Hi Ollie, thanks for your reply !

The ActiveX control doesn't have a .tlb file, is it possible to generate
this somehow ?

I have the ActiveX source, but I'm not an expert on it (it's written by
someone else).

If I use the ActiveX on the website, it somehow calls the GetIDsOfNames
function (member of IDispatch) which it passes the method's name via it's
second parameter (LPOLESTR *rgszNames) which is then translated to an
internal ActiveX function by the ActiveX.

So somehow I have to let it automatically call this GetIDsOfNames function
just like IE does I think ?

Michiel.

"Ollie Riches" <ol**********@p honeanalyser.ne t> wrote in message
news:O6******** ******@TK2MSFTN GP14.phx.gbl...

why not generate an interop assembly using the type library importer if
you have access to the original COM type library

http://msdn.microsoft.com/library/de...assemblies.asp

HTH

Ollie Riches
"Michiel" <mi*********@RE CLAMEpayvision. com> wrote in message
news:ul******** *****@TK2MSFTNG P11.phx.gbl...

Hello,

I have an ActiveX control which I can call fine from HTML pages, using
the object tag like <OBJECT ID="UserControl 1" WIDTH="0" HEIGHT="0"
CLASSID="CLSID: 85A5119D-0000-0000-0000-5467CB71943E" CODEBASE =
http://mywebsite/MyActiveX.ocx#Version=1,1,0,0 VIEWASTEXT></OBJECT>

, and then simply adding them to the object's id with a . like

UserControl1.My Function()

in JavaScript.
But how do I do this from C# ?

I can't reference to the file directly (Visual Studio says "not a valid
COM component") so I figure I have to use something like

[ComImport, Guid("85A5119D-0000-0000-0000-5467CB71943E"),
TypeLibType(416 0)]
public class MyActiveX
{
[PreserveSig, MethodImpl(Meth odImplOptions.I nternalCall,
MethodCodeType= MethodCodeType. Runtime)]
public virtual extern int MyFunction();
}
And then calling it like

MyActiveX oAX=new MyActiveX();
oAX.MyFunction( );

However, this gives me an ExecutionEngine Exception at the last line.

Thanks for any clues !

Michiel.