CODEWITHSUNDEEP
c++winapibitmap
user1887092
user1887092

Reputation: 83

c++,bitmap won't show?

The bitmap will not display when the left mouse button is clicked. I'm using visual c++ express

HDC DC, memDC;

switch(message) {
case WM_CREATE:
        hBit1 = LoadBitmap(hInst, "C:\New folder (2)\MyBP1.bmp");
        break;

case WM_LBUTTONDOWN:
            DC = GetDC(hwnd);
            memDC = CreateCompatibleDC(DC);
        SelectObject (memDC, hBit1);
        BitBlt(DC, LOWORD(lParam), HIWORD(lParam), 27, 59, memDC, 0, 0, SRCCOPY);
        ReleaseDC(hwnd, DC);
        DeleteDC(memDC);
        break;

I'm not sure exactly whats wrong with the code. Theres no errors displayed in visual c++ express If the code is all wrong would someone point me in the right direction

Upvotes: 1

Views: 649

Answers (1)

Jerry Coffin
Jerry Coffin

Reputation: 490728

LoadBitmap is only for loading bitmaps that are stored as resources in your executable or a DLL.

To load a bitmap from a BMP file, you want to use LoadImage with the LR_LOADFROMFILE flag, something like this:

bmp = (HBITMAP)LoadImage(0, filename, IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE);

As an aside, you probably don't really want to do the displaying directly in response to WM_LBUTTONDOWN. Instead, you normally want to record the position, possibly set a flag to indicate that the bitmap should be displayed, and call InvalidateRect to invalidate your client rectangle -- then do the actual drawing in response to WM_PAINT.

Upvotes: 6

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