Question

我一直在编写一个程序，每次关闭我的表单时都会抛出异常，说我的堆栈溢出了关闭后台工作程序的行...
我已经面对这个问题已经有一段时间了，我已经尝试了谷歌搜索问题，但我还没有找到任何想要的解决方案......

我的疑难解答猜测如下：

图片框中的图片占用资源，在中止程序时不会被清除
后台工作人员仍然忙着

这是我的代码，提前谢谢！

元素

Picturebox名为 videobox
  按钮名为 btnOpenCamera_Click
  按钮名为 btnCloseCamera_Click
  标签名为 backgroundworkerStatus

变量

全局

Mat videoFrame;
VideoCapture video(0);

私人

bool flag_cameraStatus = true;
bool flag_backgroundworkerStatus = false;

功能

private：System :: Void MainForm_FormClosing

// this event is triggered when application is closing

video.release();

/* Exception is thrown here "System.StackOverflowException" */
backgroundWorker->CancelAsync();

if (backgroundWorker->IsBusy == false) {
    checkBackgroundworkerStatus();
    this->Close();
}
else {
    MessageBox::Show("Backgroundworker not aborted");
    e->Cancel = true;
}

private：System :: Void btnOpenCamera_Click

// this is a button for turning on camera

flag_cameraStatus = true;
backgroundWorker->RunWorkerAsync();

private：System :: Void btnCloseCamera_Click

// this is a button for turning off camera

flag_cameraStatus = false;
videoBox->Image = nullptr;

int openCamera（）

// this is a button for turning off camera

if (!video.isOpened()) {
    MessageBox::Show("Cannot Find Camera!");
    return -1;
}

while (flag_camera) {

  video >> videoFrame;
  if (videoFrame.empty()) {
        break;
  }

  /* These lines of code converts Opencv mat to bitmap for picturebox to display */
  System::Drawing::Graphics^ graphics = videoBox->CreateGraphics();
  System::IntPtr ptr(videoFrame.ptr());
  System::Drawing::Bitmap^ b = gcnew System::Drawing::Bitmap(videoFrame.cols, videoFrame.rows, videoFrame.step, System::Drawing::Imaging::PixelFormat::Format24bppRgb, ptr);
  System::Drawing::RectangleF rect(0, 0, videoBox->Width, videoBox->Height);
  graphics->DrawImage(b, rect);

  /* Was wondering if I need these lines of code below */
  /* delete graphics;                                  */

if (flag_camera == false) {
    videoBox->Image = nullptr;
    return 0;
}

void checkBackgroundworkerStatus（）

// this function is used to check if backgroundworker is busy
// it will identify the status via the backcolor of label backgroundworkerStatus

if(backgroundWorker->IsBusy==true)
backgroundworkerStatus->BackColor = Color::Green;
else
backgroundworkerStatus->BackColor = SystemColors::Control;

private：System :: Void backgroundWorker_DoWork

// this event is triggered when background worker is working

if (backgroundWorker->CancellationPending == false) {
    checkBackgroundworkerStatus();
    openCamera();
}
else {
    this->backgroundWorker->CancelAsync();
}

private：System :: Void backgroundWorker_RunWorkerCompleted

// this event is triggered when background worker is done working

checkBackgroundworkerStatus();

一些最后的注释......

我确实设置了

WorkerSupportsCancellation = true
WorkerReportsProgress = true

Answer 1

要解决此问题，请向DoWork添加延迟

private：System :: Void backgroundWorker1_DoWork

using namespace System::Threading
  /* your DoWork tasks */
  Thread::Sleep(50)

注意
Thread :: Sleep以毫秒为单位计算，您可以根据相机fps更改为您想要的数字。我的笔记本电脑摄像头约。 15帧/秒，每帧66.66毫秒，睡眠时间应该> =这个ms /帧，但我没有问题，运行它只有50毫秒的延迟。

使用Windows窗体的OpenCV继续抛出有关堆栈溢出的异常

1 个答案: