Question

我正在尝试使用AForge.NET将网络摄像头图像保存在目录中。

这是我的代码：

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
    }

    FilterInfoCollection webcam;
    VideoCaptureDevice cam;
    Bitmap bitmap;

    private void Form1_Load(object sender, EventArgs e)
    {    
        webcam = new FilterInfoCollection(FilterCategory.VideoInputDevice);
        cam = new VideoCaptureDevice(webcam[0].MonikerString);
        cam.NewFrame += new NewFrameEventHandler(cam_NewFrame);
        cam.Start();   
    }

    void cam_NewFrame(object sender, NewFrameEventArgs eventArgs)
    {
        bitmap = (Bitmap)eventArgs.Frame.Clone();
        pictureBox1.Image = bitmap;
        pictureBox1.Image.Save("c:\\image\\image1.jpg");
    }

但我得到了这个例外：

InvalidOperationException was unhandled Object is currently in use elsewhere. If you are using Graphic objects after the GetHdc method, call the RealseHdc method.

提前致谢。

Answer 1

问题在于这一行：

pictureBox1.Image = bitmap;
pictureBox1.Image.Save("c:\\image\\image1.jpg");

您正在尝试保存尚未正确加载的图像，并且您正面临交叉线程。

这种情况下的解决方案是在绘图时不使用多个线程。

void cam_NewFrame(object sender, NewFrameEventArgs eventArgs)
{
    bitmap = (Bitmap)eventArgs.Frame.Clone();
    pictureBox1.Image = bitmap;

         try
         {
             this.Invoke((MethodInvoker)delegate
             {
                 //saves image on its thread

                 pictureBox1.Image.Save("c:\\image\\image1.jpg");

             });
         }
         catch (Exception ex)
         {
             MessageBox.Show(""+ex);
         }
 }

将图片框中的图像保存到特定目录

1 个答案: