C＃Windows窗体捕获从嵌入式的Windows Media Player中的形象 [英] C# Windows Forms capture a image from embeded Windows Media Player

问题描述

我有一个Windows窗体应用程序编写中采用嵌入式的Windows Media Player（AxInterop.WMPLib.dll和WMPLib.dll）C＃播放一些视频文件。现在我需要添加一个选项从视频捕获图像按钮的点击。如果我设置了窗户的选项设置为true，我能够捕获视频的图像，但是当我的窗户选项设置为true我没有看到在某些计算机视频图像。没有窗户的选项我只得到一个黑色的屏幕与此代码：

I have a windows forms application written in C# which uses embedded Windows Media Player (AxInterop.WMPLib.dll and WMPLib.dll) to play some video files. Now I need to add an option to capture image from video on button click. If I set the windowless option to true, I am able to capture an image of a video, but when I set the windowless option to true I don't see a video image on some computers. Without the windowless option I only get a black screen with this code:

        System.Drawing.Image ret = null;
        try{
            Bitmap bitmap = new Bitmap(wmPlayer.Width-26, wmPlayer.Height-66);
            {
                Graphics g = Graphics.FromImage(bitmap);
                {
                    Graphics gg = wmPlayer.CreateGraphics();
                    {
                        this.BringToFront();

                           g.CopyFromScreen(
                            wmPlayer.PointToScreen(
                                new System.Drawing.Point()).X+13,
                            wmPlayer.PointToScreen(
                                new System.Drawing.Point()).Y,
                            0, 0,
                            new System.Drawing.Size(
                                wmPlayer.Width-26,
                                wmPlayer.Height-66)  
                            );
                    }
                }
                using (MemoryStream ms = new MemoryStream()){
                        bitmap.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
                        ret = System.Drawing.Image.FromStream(ms);
                        ret.Save(@"C:\\WMP_capture.png");
                        pictureBox1.Image=ret;
                }
            }
            bitmap.Dispose();

        }catch (Exception){ }

我怎么能捕获帧从视频中嵌入的Windows Media Player中播放无窗户的选项在C＃（快照）？

How can I capture a frame (snapshot) from a video playing in embedded Windows Media Player without the windowless option in C#?

或者是有C＃Windows窗体任何其他视频播放器，可以轻松实现并支持拍摄功能。

Or is there any other video player for C# windows forms that can be easily implemented and that supports capture functionality.

推荐答案

希望你此代码的工作。

if (!string.IsNullOrEmpty(axWindowsMediaPlayer1.URL)){
axWindowsMediaPlayer1.Ctlcontrols.pause();

System.Drawing.Image ret = null;
try
{
    // take picture BEFORE saveFileDialog pops up!!
    Bitmap bitmap = new Bitmap(axWindowsMediaPlayer1.Width, axWindowsMediaPlayer1.Height);
    {
        Graphics g = Graphics.FromImage(bitmap);
        {
            Graphics gg = axWindowsMediaPlayer1.CreateGraphics();
            {
                //timerTakePicFromVideo.Start();
                this.BringToFront();
                g.CopyFromScreen(
                    axWindowsMediaPlayer1.PointToScreen(
                        new System.Drawing.Point()).X,
                    axWindowsMediaPlayer1.PointToScreen(
                        new System.Drawing.Point()).Y,
                    0, 0,
                    new System.Drawing.Size(
                        axWindowsMediaPlayer1.Width,
                        axWindowsMediaPlayer1.Height)
                    );
            }
        }
        // afterwards save bitmap file if user wants to
        if (saveFileDialog1.ShowDialog() == DialogResult.OK)
        {
            using (MemoryStream ms = new MemoryStream())
            {
                bitmap.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
                ret = System.Drawing.Image.FromStream(ms);
                ret.Save(saveFileDialog1.FileName);
            }
        }
    }
}
catch (Exception ex)
{
    Debug.WriteLine(ex.Message);
}

}

}

HTTP：你还有一个演示// WWW .codeproject.com /用品/ 34663 / DirectShow的例子换用-SampleGrabber换-GR

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