question regarding dibsections

[Marcus Meissner]

Hi,

While debugging twain, I came across the nativexfer method, used by 60-70%
of all twain using programs.

It has some very unfortunate programming logic.

Here is a sample snippet from:
    http://hp.vector.co.jp/authors/VA011973/prg_twain.htm

TW_UINT16 rc;
    TW_UINT32 hBitmap;
    TW_BOOL PendingXfers = TRUE;
    LPBITMAPINFOHEADER      lpDib;

hBitmap = NULL;
    rc = lpfnDSM_Entry(pAppId,pSourceId,DG_IMAGE,DAT_IMAGENATIVEXFER,MSG_GET,(TW_MEMREF)&hBitmap);
    lpDib = (LPBITMAPINFOHEADER)GlobalLock((void*)hBitmap);
    /* ... */
    if(lpdib!=NULL){
    	GlobalUnlock((void*)hBitmap);
    	GlobalFree((void*)hBitmap);
    }

(hBitmap is the return value of CreateDIBSection()).

This sample code apparently assumes that GlobalLock(HBITMAP) gives it
a pointer to a BITMAPINFOHEADER.

We do not do this, for us HBITMAP is a regular 16bit GDI
handle.  GlobalLock will not work on it :/

Any ideas?

Ciao, Marcus