代码之家 › 专栏 › 技术社区 › user7768436

C#使用“new bitmap()”的两个线程和笔记本电脑卡住

bitmap c#

-1

user7768436 · 技术社区 · 8 年前

我的程序有两个线程,从两个摄像头抓取数据,每个线程将用于更新PictureBox:

    private void StartGrabLoop()
    {
        m_grabThread = new BackgroundWorker();
        m_grabThread.ProgressChanged += new ProgressChangedEventHandler(UpdateUI);
        m_grabThread.DoWork += new DoWorkEventHandler(GrabLoop);
        m_grabThread.WorkerReportsProgress = true;
        m_grabThread.RunWorkerAsync();
    }


    private void StartGrabLoop1()
    {
        m_grabThread1 = new BackgroundWorker();
        m_grabThread1.ProgressChanged += new ProgressChangedEventHandler(UpdateUI1);
        m_grabThread1.DoWork += new DoWorkEventHandler(GrabLoop1);
        m_grabThread1.WorkerReportsProgress = true;
        m_grabThread1.RunWorkerAsync();
    }


    private void GrabLoop(object sender, DoWorkEventArgs e)
    {
        BackgroundWorker worker = sender as BackgroundWorker;

        while (m_grabImages)
        {
            try
            {
                m_camera.RetrieveBuffer(m_rawImage);
            }
            catch (FC2Exception ex)
            {
                Debug.WriteLine("Error: " + ex.Message);
                continue;
            }

            lock (this)
            {
                m_rawImage.Convert(PixelFormat.PixelFormatBgr, m_processedImage);
            }

            worker.ReportProgress(0);
        }

        m_grabThreadExited.Set();
    }



    private void GrabLoop1(object sender, DoWorkEventArgs e)
    {
        BackgroundWorker worker = sender as BackgroundWorker;

        while (m_grabImages1)
        {
            try
            {
                m_camera1.RetrieveBuffer(m_rawImage1);
            }
            catch (FC2Exception ex)
            {
                Debug.WriteLine("Error: " + ex.Message);
                continue;
            }

            lock (this)
            {
                m_rawImage1.Convert(PixelFormat.PixelFormatBgr, m_processedImage1);
            }

            worker.ReportProgress(0);
        }

        m_grabThreadExited1.Set();
    }

 private void UpdateUI(object sender, ProgressChangedEventArgs e)
        {
            Bitmap source = m_processedImage.bitmap;
            Bitmap resized = new Bitmap(source, source.Width / zoom, source.Height / zoom);
            pictureBox1.Image = resized;
            pictureBox1.Invalidate();
}
 private void UpdateUI1(object sender, ProgressChangedEventArgs e)
        {
            Bitmap source = m_processedImage.bitmap;
            Bitmap resized = new Bitmap(source, source.Width / zoom, source.Height / zoom);
            pictureBox2.Image = resized;
            pictureBox2.Invalidate();
}

关键是它可以在我的桌面上运行得很好。但我的笔记本电脑内存有问题,要么显示白色图像,要么忙着崩溃。我做了很多研究,并尝试了dispose(),或System。总承包商。Collect();系统总承包商。WaitForPendingFinalizers();他们都不管用,有人能帮我吗?我之所以使用“新位图”,是因为我想简化缩放功能。。。。

1 回复 | 直到 8 年前

Nyerguds 8 年前

制作新图像时最好不要与旧图像有任何链接;它可以帮助垃圾收集更好地运行。此外,在放入新版本时,还要显式地处理旧版本。

private void UpdateUI(object sender, ProgressChangedEventArgs e)
{
    Bitmap source = m_processedImage.bitmap;
    Bitmap resized = CreateWithNewSize(source, source.Width / zoom, source.Height / zoom);
    // Save reference to old image in the control
    Image oldImg = pictureBox1.Image;
    pictureBox1.Image = resized;
    // specifically dispose old image to avoid memory usage buildup
    if (oldImg != null)
    {
        try{ oldImg.Dispose(); }
        catch { /* Ignore; won't help much to process this */ }
    }
    // Request refresh.
    pictureBox1.Invalidate();
}

...并对pictureBox2执行相同的操作。如所述中间不过,您可能需要在工作线程和UI线程之间设置正确的通信,可能需要使用委托。在这种情况下,我的 Save reference to old image 注释可能应该放在名为函数的委托中,以替换UI控件上的图像。

调整大小的方法非常简单:

public static Bitmap CreateWithNewSize(Image image, Int32 newWidth, Int32 newHeight)
{
    Bitmap bp = new Bitmap(newWidth, newHeight, PixelFormat.Format32bppArgb);
    using (Graphics gr = Graphics.FromImage(bp))
        gr.DrawImage(image, new Rectangle(0, 0, newWidth, newHeight));
    return bp;
}

可能应该调用相同的图像处理代码 m_processedImage1 在更换之前 m_rawImage1.Convert 呼叫由于这段新代码将为您的UI创建干净的未链接副本,因此这种处理也不会导致任何问题。