PRB: DLL Fails to Initialize If User-Defined Entry Point Is Used (314657)

RESOLUTION

If you are using the /entry switch along with /clr to compile your DLL, use the following entry point parameters:

BOOL WINAPI <your_entrypoint_name>(LPVOID hinstDLL,
                                   DWORD  dwReason,
                                   LPVOID lpvReserved)

-or-

BOOL WINAPI <your_entrypoint_name>(void* hinstDLL,
                                   DWORD dwReason,
                                   void* lpvReserved)

MORE INFORMATION

Steps to Reproduce the Behavior

The following steps demonstrate the problem:

Compile the following code to create a DLL:

#include <windows.h>

int g_x = 0;

BOOL WINAPI MyDllMain(
  HINSTANCE hinstDLL,  // handle to the DLL module
  DWORD fdwReason,     // reason for calling function
  LPVOID lpvReserved   // reserved
)
/* To get rid of the error uncomment this code and comment the 
   code above
BOOL WINAPI MyDllMain(
  LPVOID hinstDLL,  
  DWORD  fdwReason,     
  LPVOID lpvReserved   
)*/ 
{
  g_x = 1;
  return 1;
}


extern "C" __declspec(dllexport) int GetVal()
{
return g_x;
}

Use the following command lines to build the DLL. This will create Library.dll and Library.lib.
cl /c /clr /Zi library.cpp link /debug /entry:MyDllMain /dll library.obj

Compile the following code to create an application that uses Library.dll:

#include <stdio.h>
extern "C" __declspec(dllimport) int GetVal();

int main()
{
	printf("%d\n",GetVal());
	return 0;
}

Use the following command lines to build the DLL. This will create App.exe.
cl /c /clr /Zi app.cpp
link /debug app.obj library.lib
Run App.exe. You will receive the following error message:
Application failed to initialize properly (0xc0000142). Click on OK to terminate the application.

REFERENCES

For other top-hit Visual C++ .NET Microsoft Knowledge Base articles, visit the following Microsoft Web site:

Visual C++ .NET (2002) Support Center
http://support.microsoft.com/default.aspx?xmlid=fh%3BEN-US%3Bvcnet

For more information about the Visual C++ Compiler options, visit the following Microsoft Web sites:

/clr
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vccore/html/vcrefEECOMCompilation.asp

/ENTRY
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vccore/html/_core_.2f.ENTRY.asp