Question

windows编程位图问题

LRESULT CALLBACK winproc(HWND hwnd, UINT uMsg, WPARAM wparam, LPARAM lparam){ HDC hdc,hdc1; PAINTSTRUCT ps; static HBITMAP hbitmap; HINSTANCE hinstance; static int x=0, y=0; BITMAP bitmap; TCHAR str[100]; switch (uMsg){ case WM_CREATE: hinstance = ((LPCREATESTRUCTA)lparam)->hInstance; hbitmap = LoadBitmap(hinstance, TEXT("图片")); GetObject(hbitmap, sizeof(BITMAP), &bitmap); x = bitmap.bmWidth; y = bitmap.bmHeight; wsprintf(str, TEXT("%d,%d"), x, y); MessageBox(NULL, str, str, 0); return 0; case WM_DESTROY: DeleteObject(hbitmap); PostQuitMessage(0); return 0; case WM_PAINT: hdc = BeginPaint(hwnd, &ps); hdc1 = CreateCompatibleDC(hdc); SelectObject(hdc1, hbitmap); BitBlt(hdc, 0, 0, 500, 500, hdc1, 0, 0, SRCCOPY); DeleteDC(hdc1); EndPaint(hwnd, &ps); return 0; default: break; } return DefWindowProc(hwnd, uMsg, wparam, lparam);}
效果：

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Answer 1

也就是每隔1/、仍然直接在显示表面上更新画面

Answer 2

输出一下，每一次调用 api 的返回信息，调试看看