I am working on connecting a camera feed using MFC in Visual Studio.

After creating a picture box, I made buttons for open, live, and close.

When I press the open button, the camera connects, and the close button disconnects the camera.

The part where I got stuck is implementing the feature to view the live camera feed when I press the live button.

When I press the live button, I get an alert that says “failed to retrieve grab result.”

I don’t know if this is an issue with the ‘Live’ code or if it’s related to the frame capture code.

My ‘Live’ code :

void Cimageviewer12Dlg::OnBnClickedButtonLive()
{
    if (!m_isCameraConnected)
    {
        AfxMessageBox(_T("Camera is not connected. Please connect the camera first."));
        return;
    }

    try
    {
        if (!InitializeCamera())
        {
            AfxMessageBox(_T("Failed to initialize camera."));
            return;
        }

        while (true)
        {
            BYTE* pFrameData = nullptr;
            try
            {
                pFrameData = CaptureFrame();
            }
            catch (const GenICam_3_1_Basler_pylon::RuntimeException& e)
            {
                CString errorMsg;
                errorMsg.Format(_T("Failed to capture image from camera: %s"), e.what());
                AfxMessageBox(errorMsg);
                break;
            }

            if (pFrameData == nullptr)
            {
                AfxMessageBox(_T("Failed to capture image from camera."));
                break;
            }

            DisplayFrame(pFrameData);

            if (GetAsyncKeyState(VK_ESCAPE))
                break;

            Sleep(30);
        }
    }
    catch (const GenICam_3_1_Basler_pylon::RuntimeException& e)
    {
        CString errorMsg;
        errorMsg.Format(_T("An error occurred: %s"), e.what());
        AfxMessageBox(errorMsg);
    }

    ReleaseCamera();
}

My ‘initializeCamera’ code :

bool Cimageviewer12Dlg::InitializeCamera()
{
    Pylon::PylonInitialize(); // SDK 초기화

    try
    {
        // 카메라 장치 열기
        auto device = CTlFactory::GetInstance().CreateFirstDevice();
        if (device == nullptr)
        {
            AfxMessageBox(_T("Failed to create a device."));
            return false;
        }

        m_camera.Attach(device);
        m_camera.Open();
    
        if (!m_camera.IsOpen())
        {
            AfxMessageBox(_T("Failed to open the camera."));
            return false;
        }

        
    }
    catch (const Pylon::GenericException &e) // 1. 변수 사용
    {
        CString errorMessage;
        errorMessage.Format(_T("Error: %s"), e.GetDescription());
        AfxMessageBox(errorMessage);
        return false;
    }

    return true;  // 초기화 성공 여부 반환
}

My ‘CaptureFrame’ code :

BYTE* Cimageviewer12Dlg::CaptureFrame()
{
    try
    {
        if (!m_camera.IsOpen())
        {
            AfxMessageBox(_T("Camera is not open."));
            return nullptr;
        }

        // 카메라가 이미 캡처를 시작했는지 확인
        if (!m_camera.IsGrabbing())
        {
            m_camera.StartGrabbing();
            AfxMessageBox(_T("Started grabbing."));
        }

        Pylon::CGrabResultPtr ptrGrabResult;

        // 예외 처리 강화
        m_camera.RetrieveResult(20000, ptrGrabResult, Pylon::TimeoutHandling_ThrowException);

        if (!ptrGrabResult)
        {
            AfxMessageBox(_T("Failed to retrieve grab result."));
            return nullptr;
        }

        if (ptrGrabResult->GrabSucceeded())
        {
            return (BYTE*)ptrGrabResult->GetBuffer();
        }
        else
        {
            CString errorMsg;
            errorMsg.Format(_T("Grab failed: %s"), ptrGrabResult->GetErrorDescription());
            AfxMessageBox(errorMsg);
            return nullptr;
        }
    }
    catch (const Pylon::GenericException &e)
    {
        CString errorMsg;
        errorMsg.Format(_T("An exception occurred: %s"), CString(e.GetDescription()));
        AfxMessageBox(errorMsg);
        return nullptr;
    }
    catch (...)
    {
        AfxMessageBox(_T("An unexpected error occurred."));
        return nullptr;
    }
}

I can confirm that there was no problem connecting the camera through the Pylon Viewer app.

If there’s anything I’m missing, I’d appreciate it if you could let me know.