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I have a thing with 2 Basler usb-cameras and 2 lights. For power saving and educating myself I want lights to be ON only when the certain camera is running.

This programs opens 2 camera view windows on Windows. Cameras are toggling, only the other camera updates at a time but both windows keeps on. The not updating window is showing an old image, until it is updated too.

I have a form with 2 buttons: "Cameras on" and "Cameras off". It calls camera function and sends serial command to electronics.

This is very simplified, please ask if you want more code and I will provide it immediately:

myform.h:
C++
<pre>	   // Cameras on button
private: System::Void button17_Click(System::Object^ sender, System::EventArgs^ e) {
	
	stopCycle = 0;
	stop = 0;
	while (stopCycle == 0) {
		String^ BackLightsOn = "a";
		this->serialPort1->WriteLine(BackLightsOn);
		back_camera();
		String^ LightsOff = "b";
		this->serialPort1->WriteLine(LightsOff);
		Sleep(50);
		
		String^ FrontLightsOn = "c";
		this->serialPort1->WriteLine(FrontLightsOn);
		front_camera();
		String^ LightsOff = "b";
		this->serialPort1->WriteLine(LightsOff);
		Sleep(50);

	}


}

		//Cameras off button
private: System::Void button18_Click(System::Object^ sender, System::EventArgs^ e) {
	stop = 1;
	stopCycle = 1;
}




test.cpp:
C++
<pre>int back_camera() {

    if (stop == 0) {

        Pylon::PylonAutoInitTerm autoInitTerm;

        CDeviceInfo info;
        String_t serialNumber = "344322557";
        info.SetSerialNumber(serialNumber);

        CImageFormatConverter formatConverter;
        CPylonImage pylonImage;
        CGrabResultPtr ptrGrabResult;
        CBaslerUsbInstantCamera* pylon_camera;

        cv::Mat frame, playingFrame, cannyFrame, contoursFrame;

        cv::RNG rng(12345);

        pylon_camera = new CBaslerUsbInstantCamera(CTlFactory::GetInstance().CreateFirstDevice(info));

        pylon_camera->MaxNumBuffer = 1;
        formatConverter.OutputPixelFormat = PixelType_BGR8packed;
        pylon_camera->StartGrabbing();
        pylon_camera->AcquisitionFrameRate = 60.0;

        int i = 0;

        while (i < 2) {
            i++;
            if (pylon_camera->IsGrabbing())
            {
                pylon_camera->RetrieveResult(5000, ptrGrabResult, TimeoutHandling_ThrowException);

                if (ptrGrabResult->GrabSucceeded() && pylon_camera->IsGrabbing())
                {
                    const uint8_t* pImageBuffer = (uint8_t*)ptrGrabResult->GetBuffer();
                    formatConverter.Convert(pylonImage, ptrGrabResult);
                    frame = cv::Mat(ptrGrabResult->GetHeight(), ptrGrabResult->GetWidth(), CV_8UC3, (uint8_t*)pylonImage.GetBuffer());

                    cv::Size sz = frame.size();
                    int scale_percent = 20;
                    int imageWidth = sz.width;
                    int imageHeight = sz.height;
                    int down_width = imageWidth * scale_percent / 100;
                    int down_height = imageHeight * scale_percent / 100;
                    Mat resized_down;
                    resize(frame, resized_down, Size(down_width, down_height), INTER_LINEAR);
                    Mat flipped;
                    Mat flipped2;
                    flip(resized_down, flipped, 0);
                    flip(flipped, flipped2, 1);
                    cv::imshow("Back camera", flipped2);
                    cv::moveWindow("Back camera", 1140, 20);

                    int c = cv::waitKey(1);
                    if ((char)c == 'c') {
                        cv::destroyAllWindows();
                        break;
                    }
                }
            }
        }

        pylon_camera->Close();
        pylon_camera->StopGrabbing();
    }

    if (stop == 1) {
        cv::destroyAllWindows();
    }

    return 0;
}



int front_camera() {

    if (stop == 0) {

        Pylon::PylonAutoInitTerm autoInitTerm;

        CDeviceInfo info;
        String_t serialNumber = "57558330";
        info.SetSerialNumber(serialNumber);

        CImageFormatConverter formatConverter;
        CPylonImage pylonImage;
        CGrabResultPtr ptrGrabResult;
        CBaslerUsbInstantCamera* pylon_camera;

        cv::Mat frame, playingFrame, cannyFrame, contoursFrame;

        cv::RNG rng(12345);

        pylon_camera = new CBaslerUsbInstantCamera(CTlFactory::GetInstance().CreateFirstDevice(info));

        pylon_camera->MaxNumBuffer = 1;
        formatConverter.OutputPixelFormat = PixelType_BGR8packed;
        pylon_camera->StartGrabbing();
        pylon_camera->AcquisitionFrameRate = 60.0;

        int i = 0;

        while (i < 6) {
            i++;
            if (pylon_camera->IsGrabbing())
            {
                pylon_camera->RetrieveResult(5000, ptrGrabResult, TimeoutHandling_ThrowException);

                if (ptrGrabResult->GrabSucceeded() && pylon_camera->IsGrabbing())
                {
                    const uint8_t* pImageBuffer = (uint8_t*)ptrGrabResult->GetBuffer();
                    formatConverter.Convert(pylonImage, ptrGrabResult);
                    frame = cv::Mat(ptrGrabResult->GetHeight(), ptrGrabResult->GetWidth(), CV_8UC3, (uint8_t*)pylonImage.GetBuffer());

                    cv::Size sz = frame.size();
                    int scale_percent = 20;
                    int imageWidth = sz.width;
                    int imageHeight = sz.height;
                    int down_width = imageWidth * scale_percent / 100;
                    int down_height = imageHeight * scale_percent / 100;
                    Mat resized_down;
                    resize(frame, resized_down, Size(down_width, down_height), INTER_LINEAR);
                    Mat flipped;
                    Mat flipped2;
                    flip(resized_down, flipped, 0);
                    flip(flipped, flipped2, 1);
                    cv::imshow("Front camera", flipped2);
                    cv::moveWindow("Front camera", 320, 20);

                    int c = cv::waitKey(1);
                    if ((char)c == 'c') {
                        cv::destroyAllWindows();
                        break;
                    }
                }
            }
        }

        pylon_camera->Close();
        pylon_camera->StopGrabbing();
    }
    if (stop == 1) {
        cv::destroyAllWindows();              
    }    
    return 0;
}


What I have tried:

I have tried that if I dont do the function toggling and run only the other function, it will run forever and the application wont become unresponsive.
Posted
Updated 25-Jan-23 1:03am
v3

I do not have answer for you but I have run into similar situations in the past and what I did was I added various trace messages so I could figure where in the code it was hanging. That helped to know exactly where I should begin looking to solve the problem. Given that what we have here is a piece of code that no one else can run and debug I think that is the best way to proceed.

What I mean by "trace" is some mechanism for your program to emit text messages that tell you what it is doing. They could be printf statements to a console that you allocate or just about anything. Another possibility is to use the old TraceWin program by the late Paul DiLascia which you can find at Paul's Home Page[^]. I successfully used it for several years until I wrote my own thing.

Good luck.
 
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Comments
0x01AA 25-Jan-23 7:41am    
There is also that old OutputDebugString in combination with "Dbgview.exe"
I changed it to work in different way. myForm.h calls only one function from test.cpp and that function does the toggling now. Works fine.
 
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