我正在尝试在窗口周围绘制边框,但是我的代码似乎无法正常工作。它没有画任何东西。谁能告诉我这是怎么回事?

LRESULT CALLBACK WndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
    HDC hDC = 0;
    PAINTSTRUCT ps;
    ZeroMemory(&ps, sizeof(PAINTSTRUCT));
    HPEN hp353535 = 0;
    RECT rWnd;
    GetWindowRect(hWnd, &rWnd);

    switch(msg)
    {
        case WM_PAINT:
            // I could/should put GetWindowRect() here..
            hDC = BeginPaint(hWnd, &ps);
            hp353535 = CreatePen(PS_SOLID, 7, RGB(247, 247, 247));
            SelectObject(hDC, hp353535);
            MoveToEx(hDC, rWnd.left, rWnd.top, 0);
            LineTo(hDC, rWnd.right, rWnd.top);
            LineTo(hDC, rWnd.right, rWnd.bottom);
            LineTo(hDC, rWnd.left, rWnd.bottom);
            LineTo(hDC, rWnd.left, rWnd.top);
            DeleteObject(hp353535);
            EndPaint(hWnd, &ps);
            break;

        // More cases
    }
}

最佳答案

GetWindowRect()返回屏幕坐标,而绘图使用客户端坐标(即相对于窗口左上角的坐标)。我认为使用GetClientRect()会有所帮助。

07-24 09:26