More PInvoke Issues

this works -

 

code block

[dllimport("module.dll")]

public static extern intptr createmodule();

 

intptr modulepointer = createmodule();

logwindow.instance.addoutput( "pointer = " + modulepointer );

 

 

 

and prints out - 105987728

 

this doesn't work -

 

code block

modulebuilder modulebuilder;

assemblybuilder assemblybuilder;

assemblyname assemblyname = new assemblyname();

assemblyname.name = modulename;

assemblybuilder = appdomain.currentdomain.definedynamicassembly( assemblyname, assemblybuilderaccess.run );

modulebuilder = assemblybuilder.definedynamicmodule( modulename );

// createmodule function

methodbuilder mb;

mb = modulebuilder.definepinvokemethod( "createmodule", dllfile, methodattributes.public | methodattributes.static | methodattributes.pinvokeimpl,

callingconventions.standard, typeof( intptr ), null, callingconvention.cdecl, charset.unicode );

modulebuilder.createglobalfunctions();

module module = new module();

module.m_createmodulefunction = modulebuilder.getmethod( "createmodule" );

module.m_modulepointer = (intptr)module.m_createmodulefunction.invoke( null, null );

logwindow.instance.addoutput( "pointer = " + module.m_modulepointer );

 

 

 

everything works, call made successfully, however, returns 0 pointer.

 

i need 2nd code block( dynamic loading of dlls work ).  don't understand why it's returning 0.  in c++ dll, write out pointer being returned file, , it's valid.  have clue i'm doing wrong?

i've reproduced issue , reported our connect portal, can check out: http://connect.microsoft.com/visualstudio/feedback/viewfeedback.aspx?feedbackid=319570

 

thank valuable feedback. our developers investigating , hope can satisfying answer.

 

as work around, can add line code make works:

mb.setimplementationflags(methodimplattributes.preservesig);

 

preservesigattribute indicates hresult or retval signature transformation takes place during com interop calls should suppressed. can check out the  methodimplattributes enumeration (system.reflection).

.NET Framework  >  Common Language Runtime Internals and Architecture