在WPF中使用AForge.net控制摄像头拍照

来源：互联网发布：能打开db数据库的软件编辑：程序博客网时间：2024/05/21 17:41

利用AForge.net控制摄像头拍照最方便的方法就是利用PictureBox显示摄像头画面，但在WPF中不能直接使用PictureBox。必须通过<WindowsFormsHost></WindowsFormsHost>来提供交换功能。其解决方法如下：

1、按照常规方法新建一个WPF应用程序；

2、添加引用

WindowsFormsIntegration (与WinForm交互的支持）

System.Windows.Forms (WinForm控件支持）

AForge.Video和AForge.Video.DirectShow(拷贝AForge.Video.dll,AForge.Video.DirectShow.dll，摄像头操作的库）

3、在XAML中添加 xmlns:wf="clr-namespace:System.Windows.Forms;assembly=System.Windows.Forms"(用wf代替System.Windows.Forms,即可使用<wf:PictureBox/>添加PictureBox控件

4、在界面相应位置添加

　　<wf:PictureBox Name="myPicture"/>

</WindowsFormsHost>(至此，界面层的设置完成）

5、代码部分

首先在窗口加载时初始化摄像头

myPhoto = pictureHost.Child as System.Windows.Forms.PictureBox;
            FilterInfoCollection videoDevices = new FilterInfoCollection(FilterCategory.VideoInputDevice);
            if (videoDevices.Count <= 0)
            {
                System.Windows.MessageBox.Show("请连接摄像头");
                return;
            }
            else
            {
                CloseCaptureDevice();

VideoCaptureDevice myCaptureDevice = null;
                myCaptureDevice = new VideoCaptureDevice(videoDevices[0].MonikerString);//myCaptureDevice的类型为 //VideoCaptureDevice，
                myCaptureDevice.NewFrame += new NewFrameEventHandler(myCaptureDevice_NewFrame);
//myCaptureDevice.DesiredFrameSize = new System.Drawing.Size(436, 360);//436, 360
//myCaptureDevice.DesiredFrameRate = 10;
                myCaptureDevice.Start();
            }

//PictureBox myPhoto = pictureHost.Child as System.Windows.Forms.PictureBox;//获取界面中的myPicture控件

void myCaptureDevice_NewFrame(object sender, NewFrameEventArgs eventArgs)//帧处理程序
{

PictureBox myPhoto = myPicture;
         Bitmap bitmap = (Bitmap)eventArgs.Frame.Clone();
         myPhoto.Image = bitmap.Clone(
           new RectangleF((bitmap.Size.Width - 295) / 2, (bitmap.Size.Height - 413) / 2, 295, 413), //显示图像的宽度为295像素，高度为413像素
                System.Drawing.Imaging.PixelFormat.Format32bppRgb);
        }

关闭摄像头，释放系统资源（在窗口推出时必须调用）

private void CloseCaptureDevice()
        {
            if (myCaptureDevice != null)
            {
                if (myCaptureDevice.IsRunning)
                {
                    myCaptureDevice.SignalToStop();
                }

　　　　　　 myCaptureDevice = null;
}

　　　}

/// <summary>

/// 截图程序，没有实验，等待中……
/// </summary>
private void Button3_Click(object sender, EventArgs e)
{
flag = 0;
videoSource.NewFrame += new NewFrameEventHandler(video_NewFrame);
}
private void video_NewFrame(object sender, NewFrameEventArgs eventArgs)
{
Bitmap bitmap = (Bitmap)eventArgs.Frame.Clone();
if (flag == 0)
{
string img = dirc + "/" + DateTime.Now.ToString("yyyyMMddhhmmss") + ".jpg";
bitmap.Save(img);
flag = 1;
}
}

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