버튼 클릭하면 이미지 나오게 하기

LRESULT OnCommand(HWND hWnd, WPARAM wParam, LPARAM lParam){
    switch (LOWORD(wParam)){
    case 100:
        hdc = GetDC(hWnd);
        MemDC = CreateCompatibleDC(hdc);
        OldBitmap = (HBITMAP)SelectObject(MemDC, hBitmap[0]);
        BitBlt(hdc, 30, 30, 500, 500, MemDC, 0, 0, SRCCOPY);
        SelectObject(MemDC, OldBitmap);
        DeleteDC(MemDC);
        ReleaseDC(hWnd, hdc);
        break;
    case 101:
 
        break;
    }
    return 0;
}