Tlbimp.exe creats DLL with no constructors

[QSIDeveloper]

I need to add a method to a VB6 OCX that we are consuming with C# (VS 2005)
Unfortunately the person that created the original DLL to reference in the
C# code is not available. When I create a DLL using TLBIMP QDWorkFlowAx.OCX
/namespace:AxQDWorkFlow and then try to build the C# code I get a compile
error stating ‘the type AxQDassembly. QDassemblyAxClass has no constructors
defined’

I don’t see anything in the TLBIMP doc that covers this.

I also have tried creating a new VB control and a C# consumer for that
control with the same result.

 

[Jialiang Ge [MSFT]]

Hello QSIDeveloper,

For ActiveX control developed by VB6, we do not use tlbimp to generate its
.net wrapper (interop assemblies) because AxtiveX controls require a
AxHost. Instead, we use the tool: aximp, which can be found in the
directory: C:\program files\Microsoft Visual Studio.NET\FrameworkSDK\Bin\.
You can run the command as:

aximp QDWorkFlowAx.OCX

and it will generate two interop dlls: QDWorkFlowAx.dll and
AxQDWorkFlowAx.dll

AxQDWorkFlowAx.dll contains the constructor we need to create the ActiveX
control.

For more information, I personally recommend the book "Professional Visual
Basic Interoperability - COM and VB6 to .NET" written by Billy Holli, and
Rockford Lhotka. In its Chapter 13, it introduce the interop between .NET
and ActiveX control in very detail.

If you have any other concerns or questions, feel free to let me know.

Regards,
Jialiang Ge ([email protected], remove ¡®online.¡¯)
Microsoft Online Community Support

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[QSIDeveloper]

Thank you that worked.