Thread: Using MAPI in C application

I am trying to add MAPI functionality to my C application. Can anyone give me an idea of how to best do this.

I have to add the MAPI32.dll at runtime using LoadLibrary and using typedef's for the functions. I don't have any experience doing it this way and the examples that I have found on the web are very simplistic. All I want to do is be able to call the MAPIResolveName and MAPIAddress functions from my C application.

Ok, I've got it to compile and run but I am getting an unhandled exception when it calls lpfnMAPIResolveName. Can anyone see anything that might be wrong with my code?

Code:

prototypes...

typedef MediumInt (CALLBACK* LPFNMAPIRESOLVENAME)(LHANDLE lhSession, ULONG param, LPTSTR name, Flags16 options, ULONG reserved, MapiRecipDesc * lppRecip);
typedef MediumInt (CALLBACK* LPFNMAPIFREEBUFFER)(LPVOID pv);

code...

Bool Dynlink SmpCheckName( PSMP pSmp, PWND pWnd, PSTR pStr, MediumInt size )
{
   HINSTANCE   hMapi;
   MediumInt   rtn;
   Flags16     options;
   LPFNMAPIRESOLVENAME lpfnMAPIResolveName;
   LPFNMAPIFREEBUFFER  lpfnMAPIFreeBuffer;
   
   SmpAssert( pSmp );
                               
   BitSet( options, MAPI_DIALOG );
   BitSet( options, MAPI_NEW_SESSION );
   
   hMapi = LoadLibrary( "MAPI32.DLL" );
   if( hMapi == NULL )
      return False;
      
   lpfnMAPIResolveName = (LPFNMAPIRESOLVENAME)GetProcAddress( hMapi, "MAPIResolveName" );
   lpfnMAPIFreeBuffer = (LPFNMAPIFREEBUFFER)GetProcAddress( hMapi, "MAPIFreeBuffer" );
   
   rtn = lpfnMAPIResolveName( 0, (ULargeInt) WndAsHwnd( pWnd ), pStr, options, 0, pSmp->mapiDesc );
   
   if( rtn != SUCCESS_SUCCESS )
   {  FreeLibrary( hMapi );
      return False;
   }
   
   StrCopy( pStr, size, pSmp->mapiDesc->lpszAddress );
   lpfnMAPIFreeBuffer( pSmp->mapiDesc );   
   FreeLibrary( hMapi );
   return True;   
            
} /* End SmpCheckName */

lpfnMAPIResolve wasn't NULL it had an assigned address, but the problem was my MapiDesc wasn't a stack variable and needed to be.

Now it runs fine except it returns successful, but the address is NULL. After further research I find that this is a Microsoft issue where if your default browser is set to Outlook the lpszAddress returns NULL. There is a hotfix for this though, http://support.microsoft.com/kb/820369