为什么在C ++ CLI中使用DialogResult :: OK会出现异常

Question

我正在尝试打开一张图片并将其显示在图片框中但获得例外。

我使用visual studio 2017 c ++ CLI。

我在开头包含这些库

#include<opencv2/core/core.hpp>
#include<opencv2/highgui/highgui.hpp>
#include<opencv2/imgproc/imgproc.hpp>
#pragma managed

#include <Windows.h>
#include <conio.h>

cv::Mat img; cv::Mat imgThresh;

  

LPRCNN.exe中的0x00007FF9582E5D43（comctl32.dll）抛出异常：   0xC0000005：访问冲突读取位置0xFFFFFFFFB2BEB41A。   发生

private: System::Void btnBrowse_Click(System::Object^  sender, System::EventArgs^  e) {
        //Stream;
    Stream^ myStream;

    OpenFileDialog^ openFileDialog1 = gcnew OpenFileDialog;

    openFileDialog1->InitialDirectory = Directory::GetCurrentDirectory();
    openFileDialog1->Filter = "txt files (*.txt)|*.txt|All files (*.*)|*.*";
    openFileDialog1->FilterIndex = 2;
    openFileDialog1->RestoreDirectory = true;

    if (openFileDialog1->ShowDialog() == System::Windows::Forms::DialogResult::OK)
    {
        if ((myStream = openFileDialog1->OpenFile()) != nullptr)
        {

            file_path_temp = (openFileDialog1->FileName);
            txtImgUrl->Text = file_path_temp;

            IntPtr pointer_temp = Marshal::StringToHGlobalAnsi(file_path_temp);
            const char* input_location = static_cast<const char*>(pointer_temp.ToPointer());

            cv::Mat imgOriginalScene = cv::imread(input_location, CV_LOAD_IMAGE_ANYDEPTH | CV_LOAD_IMAGE_ANYCOLOR);

            if (!imgOriginalScene.empty())
            {
                cvtColor(imgOriginalScene, img, CV_RGB2RGBA);
                cv::imwrite("temp/temp.bmp", imgOriginalScene);
                System::Drawing::Graphics^ graphics = PicBoxCar->CreateGraphics();
                System::Drawing::Bitmap^ b = gcnew System::Drawing::Bitmap("temp/temp.bmp");
                System::Drawing::RectangleF rect(0, 0, (float)PicBoxCar->Width, (float)PicBoxCar->Height);
                graphics->DrawImage(b, rect);
                delete b;                   
            }
            else
                MessageBox::Show("Cannot open this image please choose another one !!", "Path:");

            myStream->Close();
        }

    }
}