windows編程 單擊按鈕改變表單背景圖片

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上載者:User

case ID_BACKGROUND_BITMAP1:
   flag = 1;
   InvalidateRect(hWnd, NULL, TRUE);
   break;
  case ID_BACKGROUND_BITMAP2:
   flag = 2;
   InvalidateRect(hWnd, NULL, TRUE);
   break;
  case ID_BACKGROUND_BITMAP3:
   flag = 3;
      InvalidateRect(hWnd, NULL, TRUE);
   break;

以上是三個單擊按鈕事件,通過單擊不同的按鈕將flag置為不同的值,然後用invalidaterect觸發wm_paint重繪表單。

case WM_PAINT:
  PAINTSTRUCT ps;
  HDC hdc;
  HBITMAP hbmp;
  if (flag == 1)
  {
   hdc = BeginPaint(hWnd, &ps);
   GetClientRect(hWnd, &rt);
   {
    hbmp = LoadBitmap(hInst, MAKEINTRESOURCE(IDB_BITMAP1));
    HDC dcmem = CreateCompatibleDC(hdc);
    SelectObject(dcmem, hbmp);
    BitBlt(hdc, 0, 0, rt.right, rt.bottom, dcmem, 0, 0, SRCCOPY);
   }
   EndPaint(hWnd, &ps);
  }
  else if (flag == 2)
  {
   hdc = BeginPaint(hWnd, &ps);
   GetClientRect(hWnd, &rt);
   {
          hbmp = LoadBitmap(hInst, MAKEINTRESOURCE(IDB_BITMAP2));
    HDC dcmem = CreateCompatibleDC(hdc);
    SelectObject(dcmem, hbmp);
    BitBlt(hdc, 0, 0, rt.right, rt.bottom, dcmem, 0, 0, SRCCOPY);
   }
   EndPaint(hWnd, &ps);
  }
  else if (flag == 3)
  {
   hdc = BeginPaint(hWnd, &ps);
   GetClientRect(hWnd, &rt);
   {
    hbmp = LoadBitmap(hInst, MAKEINTRESOURCE(IDB_BITMAP3));
    HDC dcmem = CreateCompatibleDC(hdc);
    SelectObject(dcmem, hbmp);
    BitBlt(hdc, 0, 0, rt.right, rt.bottom, dcmem, 0, 0, SRCCOPY);
   }
   EndPaint(hWnd, &ps);
  }
  break;

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