cannot convert from HBITMAP__* to unsigned long

This is a discussion on cannot convert from HBITMAP__* to unsigned long within the Windows Programming forums, part of the Platform Specific Boards category; Code: HBITMAP Ball = LoadBitmap(GetModuleHandle(NULL), MAKEINTRESOURCE(IDB_BALL)); HBITMAP BallMask = CreateBitmapMask(Ball, RGB(255,0,255)); Code: HBITMAP CreateBitmapMask(COLORREF hbmColour, COLORREF crTransparent); HBITMAP CreateBitmapMask(HBITMAP hbmColour, ...

  1. #1
    Unregistered Leeman_s's Avatar
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    Oct 2001
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    cannot convert from HBITMAP__* to unsigned long

    Code:
    HBITMAP Ball = LoadBitmap(GetModuleHandle(NULL), MAKEINTRESOURCE(IDB_BALL));
    			HBITMAP BallMask = CreateBitmapMask(Ball, RGB(255,0,255));
    Code:
    HBITMAP CreateBitmapMask(COLORREF hbmColour, COLORREF crTransparent);
    
    HBITMAP CreateBitmapMask(HBITMAP hbmColour, COLORREF crTransparent)
    {
    	HDC hdcMem, hdcMem2;
    	HBITMAP hbmMask;
    	BITMAP bm;
    
    	GetObject(hbmColour, sizeof(BITMAP), &bm); //bm holds ship info now
    	hbmMask = CreateBitmap(bm.bmWidth, bm.bmHeight, 1, 1, NULL); //create a bitmap with same size
    
    	hdcMem = CreateCompatibleDC(0); //two new DCs
    	hdcMem2 = CreateCompatibleDC(0);
    
    	SelectObject(hdcMem, hbmColour); //ship into MemDC
    	SelectObject(hdcMem2, hbmMask);  //blank bitmap, same size, into MemDC #2
    
    	SetBkColor(hdcMem, crTransparent); //background of DC with ship is pink
    
    	BitBlt(hdcMem2, 0, 0, bm.bmWidth, bm.bmHeight, hdcMem, 0, 0, SRCCOPY);
    	//ship with pink background blitted onto blank bitmap
    
    	BitBlt(hdcMem, 0, 0, bm.bmWidth, bm.bmHeight, hdcMem2, 0, 0, SRCINVERT);
    	//hDCMem2 has small bitmap w/ pink background
    
    	DeleteDC(hdcMem);
    	DeleteDC(hdcMem2);
    
    	return hbmMask;
    }
    c:\documents and settings\administrator\desktop\leegames\pong\main. cpp(36) : error C2664: 'CreateBitmapMask' : cannot convert parameter 1 from 'struct HBITMAP__ *' to 'unsigned long'
    This conversion requires a reinterpret_cast, a C-style cast or function-style cast

    i get that error when trying to make the bitmap mask

    anyone know why?

  2. #2
    Unregistered Leeman_s's Avatar
    Join Date
    Oct 2001
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    753
    LOL!

    After reading my own post I saw the answer!

    excuse me for such a stupid post.....

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