x64 dll calling issue - thought I could fix it but not so fast.......

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C++

I am running two 64 bit com dlls, BCRMaster.dll and BCRSlave.dll in a process of a larger 64 bit application. BCRSlave calls a function in BCRMaster called SlaveCheckin
where the instance of a Slave instance is logged along with it's DWORD pointer, DWORD ID and BOOL LiveOrDie which is to be 1 or 0 whether the slave is connecting or disconnecting.

If compiled to 32 bit and run in a 32 application this works flawlessly.
If compiled to 64 bit and run in a 64 bit version of the same app the wrong data is received at the master. I am using a .DEF file to do the exports.

It looks like the receiving DWORD is not wide enough. What should I be doning and is there a bitness independent solution?

Here is the slave calling code:

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typedef void (CALLBACK* LPFNDLLFUNC1)(DWORD,CBCRSlave*,BOOL);
	
    HINSTANCE hDLL;               // Handle to DLL
    LPFNDLLFUNC1 lpfnDllFunc1;    // Function pointer
	
   // DWORD dwParam1 = 1;
   // UINT  uParam2 = 2, uReturnVal;
    hDLL = LoadLibrary("BCRMaster");
    if (hDLL != NULL)
    {
     lpfnDllFunc1 = (LPFNDLLFUNC1)GetProcAddress(hDLL, "SlaveCheckin");
	 
       if (!lpfnDllFunc1)
       {
          FreeLibrary(hDLL);    
          return -1;
       }
       else
       {
	 
		   CurThisPtr = this;
		   lpfnDllFunc1(m_dwSurfaceId,CurThisPtr,1); 
	   }
 
	}
 
		if ( FAILED( hr ))
			return hr;
	}
 
	return hr;
 }

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Here is the receiving Master function:

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void CBCRMaster::SlaveCheckin(DWORD SurfaceID, DWORD ObjInstPtr,BOOL BornOrDead)

----------------------------------------------------------------------------------

The Slave sends:

SurfaceID = 0x00000boc
ObjIstPtr = 0x000000000a9f7930
BornOrDead = 1

The Master Receives:

SurfaceID = 0x0b0c7930
ObjInstPtr = 0x00000001
BornOrDead = 0x0012e438

:Thanks

Ron