PRB: CreateDialogIndirect() Fails Under Windows 95 (137618)

CAUSE

The dialog resource for Windows 95 is the same as Windows NT; that is, all strings must be in Unicode, and all structures must be DWORD aligned.

Programs ported from Windows NT may find that when they insert strings into the dialog template resource, they used lstrcpyW() to force the string to be Unicode or the program itself was called compiled for Unicode. However, lstrcpyW() is not implemented in Windows 95, so it returns ERROR_NOT_IMPLEMENTED. To generate Unicode strings in Windows 95, the program must use MultiByteToWideChar().

Programs ported from 16-bit Windows 3.1 will probably have problems with the Unicode strings mentioned above and also with the structure alignment. In 16-bit Windows, dialog box resource structures are aligned on byte boundaries, so there's no work for the programmer to do. However, in Win32, all structures must be aligned on DWORD (four-byte) boundaries. AlignPtr() is a simple helper routine that takes a pointer and returns the nearest pointer aligned on a DWORD boundary. The program should call this between all the dialog resource structures.

   // 
   // AlignPtr - Helper routine.  Take an input pointer, return closest
   // pointer that is aligned on a DWORD (4 byte) boundary.
   // 

   LPWORD AlignPtr (LPWORD lpIn)
   {

     ULONG ul;

     ul = (ULONG) lpIn;
     ul +=3;
     ul >>=2;
     ul <<=2;
     return (LPWORD) ul;

   }