如何在没有表单的情况下捕获屏幕?

时间:2013-05-26 13:59:26

标签: c# winforms

这是我用来捕捉我的屏幕和鼠标游戏的类作为截图。 但我想以某种方式表明,如果表格位于屏幕中间,则不会捕获屏幕和表格背后的区域,而不是表格自己。

即使表单位于前面,我点击按钮或在应用程序运行时更改表单中的内容但不捕获它只是继续捕获屏幕后面的区域,如表格不存在。

using System;
using System.Runtime.InteropServices;
using System.Drawing;
using System.Drawing.Imaging;
using System.Windows.Forms;

namespace ScreenShotDemo
{
    public class ScreenCapture
    {
        [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.Format32bppArgb);

            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;
        }
    }

我的意思是,我会在运行时看到表单,我将能够更改单击按钮,但如果我将使用Paint编辑它,则捕获的屏幕截图将不会看到表单。

这是Form1我如何进行捕获:

private void StartRecording_Click(object sender, EventArgs e)
        {
            timer1.Enabled = true;
        }

并且timer1 tick事件:

private void timer1_Tick(object sender, EventArgs e)
        {
            using (bitmap = (Bitmap)ScreenCapture.CaptureScreen(true))
            {
                ffmp.PushFrame(bitmap);
            }       
        }

此行进行实际捕获:using(bitmap =(Bitmap)ScreenCapture.CaptureScreen(true))

1 个答案:

答案 0 :(得分:8)

嗯..隐藏表格?

this.Visible = false;然后运行屏幕截图方法。

像这样:

protected Bitmap TakeScreenshot(bool cursor)
{
   Bitmap bitmap;
   this.Visible = false;
   bitmap = CaptureScreen(cursor);
   this.Visible = true;
   return bitmap;
}

并按照您想要的方式在代码中使用它:

 private void timer1_Tick(object sender, EventArgs e)
 {
    using (bitmap = (Bitmap)ScreenCapture.TakeScreenshot(true))
    {
        ffmp.PushFrame(bitmap);
    }       
 }