如何使用 Windows API 捕获屏幕和鼠标指针？答案

【问题标题】：How to capture the screen and mouse pointer using Windows APIs?如何使用 Windows API 捕获屏幕和鼠标指针？
【发布时间】：2011-07-19 15:46:20
【问题描述】：

我正在使用以下代码在位图中捕获屏幕。屏幕被捕获，但我无法在屏幕上获得鼠标指针。您能否建议一些替代方法以便也捕获鼠标？

    private Bitmap CaptureScreen()
    {
        // Size size is how big an area to capture
        // pointOrigin is the upper left corner of the area to capture
        int width = Screen.PrimaryScreen.Bounds.X + Screen.PrimaryScreen.Bounds.Width;
        int height = Screen.PrimaryScreen.Bounds.Y + Screen.PrimaryScreen.Bounds.Height;
        Size size = new Size(width, height);
        Point pointOfOrigin = new Point(0, 0);

        Bitmap bitmap = new Bitmap(size.Width, size.Height);
        {
            using (Graphics graphics = Graphics.FromImage(bitmap))
            {
                graphics.CopyFromScreen(pointOfOrigin, new Point(0, 0), size);
            }
            return bitmap;
        }
    }

【问题讨论】：

标签： c# .net graphics

【解决方案1】：

[StructLayout(LayoutKind.Sequential)]
struct CURSORINFO
{
    public Int32 cbSize;
    public Int32 flags;
    public IntPtr hCursor;
    public POINTAPI ptScreenPos;
}

[StructLayout(LayoutKind.Sequential)]
struct POINTAPI
{
    public int x;
    public int y;
}

[DllImport("user32.dll")]
static extern bool GetCursorInfo(out CURSORINFO pci);

[DllImport("user32.dll")]
static extern bool DrawIcon(IntPtr hDC, int X, int Y, IntPtr hIcon);

const Int32 CURSOR_SHOWING = 0x00000001;

public static Bitmap CaptureScreen(bool CaptureMouse)
{
    Bitmap result = new Bitmap(Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height, PixelFormat.Format24bppRgb);

    try
    {
        using (Graphics g = Graphics.FromImage(result))
        {
            g.CopyFromScreen(0, 0, 0, 0, Screen.PrimaryScreen.Bounds.Size, CopyPixelOperation.SourceCopy);

            if (CaptureMouse)
            {
                CURSORINFO pci;
                pci.cbSize = System.Runtime.InteropServices.Marshal.SizeOf(typeof(CURSORINFO));

                if (GetCursorInfo(out pci))
                {
                    if (pci.flags == CURSOR_SHOWING)
                    {
                        DrawIcon(g.GetHdc(), pci.ptScreenPos.x, pci.ptScreenPos.y, pci.hCursor);
                        g.ReleaseHdc();
                    }
                }
            }
        }
    }
    catch
    {
        result = null;
    }

    return result;
}

【讨论】：

注意，这段代码会在错误的位置绘制一些光标，因为你需要调用'GetIconInfo'来获取偏移量。还有一些会出现褪色，更多细节见：stackoverflow.com/questions/918990

【解决方案2】：

如果您不是在寻找当前使用的光标的精确副本，您可以使用以下代码，您只需在原始代码中添加一行！

private Bitmap CaptureScreen()
{
    // Size size is how big an area to capture
    // pointOrigin is the upper left corner of the area to capture
    int width = Screen.PrimaryScreen.Bounds.X + Screen.PrimaryScreen.Bounds.Width;
    int height = Screen.PrimaryScreen.Bounds.Y + Screen.PrimaryScreen.Bounds.Height;
    Size size = new Size(width, height);
    Point pointOfOrigin = new Point(0, 0);

    Bitmap bitmap = new Bitmap(size.Width, size.Height);
    {
        using (Graphics graphics = Graphics.FromImage(bitmap))
        {
            graphics.CopyFromScreen(pointOfOrigin, new Point(0, 0), size);
            //Following code is all you needed!
            graphics.DrawIcon(new Icon("Sample.ico"),Cursor.Position.X-50,Cursor.Position.Y-50);
            //The reason I minus 50 in the position is because you need to "offset" the position. Please go check out the post WholsRich commented.
        }
        return bitmap;
    }
}

你可以上网下载各种图标。

或使用ICO Convert 制作您自己的。

祝你好运！

【讨论】：