C++ OpenCV网络摄像头源未在PictureBox visual studio 2015中显示

大家好，我使用opencv从默认摄像头获取网络摄像头提要，我希望在windows窗体上的图片框中显示它。我的网络摄像头打开了，但由于某些原因，该提要从未显示在我的picturebox上。请有人帮我指出/解决这个问题，因为我现在被困在这里。 提前谢谢

在myform.h中，我有以下代码将picturebox发送到myform.cpp文件：

System::Windows::Forms::PictureBox^ mypicbox1(void)  
{
    opencv_gui::MyForm aform;
    return aform.pictureBox1;
}

获取视频提要并将其放入myform.cpp中的图片框的代码是：

void opencv_gui::DrawCvImage(const cv::Mat& cvImage)
{
    System::Windows::Forms::PictureBox^ pictureBox = mypicbox1();
    // only color images are supported
    assert(cvImage.type() == CV_8UC3);

    if ((pictureBox->Image == nullptr) || (pictureBox->Width != cvImage.cols) || (pictureBox->Height != cvImage.rows))
    {
        pictureBox->Width = cvImage.cols;
        pictureBox->Height = cvImage.rows;
        pictureBox->Image = gcnew System::Drawing::Bitmap(cvImage.cols, cvImage.rows);
    }

    // Create System::Drawing::Bitmap from cv::Mat
    System::Drawing::Bitmap^ bmpImage = gcnew System::Drawing::Bitmap(
        cvImage.cols, cvImage.rows, cvImage.step,
        System::Drawing::Imaging::PixelFormat::Format24bppRgb,
        System::IntPtr(cvImage.data)
    );

    // Draw Bitmap over a PictureBox
    System::Drawing::Graphics^ g = System::Drawing::Graphics::FromImage(pictureBox->Image);

    g->DrawImage(bmpImage, 0, 0, cvImage.cols, cvImage.rows);
    pictureBox->Refresh();

    delete g;
}


//camera feed
int opencv_gui::video_cap(void)
{
    VideoCapture cap;

    if (!cap.open(0)) // open the default camera (camera 0), use something different from 0 otherwise;
        return 0;
    for (;;)
    {
        Mat frame;
        cap >> frame;
        if (frame.empty()) break; // end of video stream
        DrawCvImage(frame);
        if (waitKey(10) == 27) break; // stop capturing by pressing ESC 
    }
    // the camera will be closed automatically upon exit
    // cap.close();
    return 0;
}

这是我的调试日志：我使用了像“>>>>>>>”这样的箭头来显示重要的参数，并使用了“RED>>>>>>>>>这样的词来显示错误参数

• cvImage{flags=1124024336 dims=2行=480…}cv:：Mat&
• 分配器0x0000000000000000 cv:：MatAllocator* COLS640INT

• 数据0x000026AC2146F80无符号字符* *（*cvImage）.数据0''无符号字符

• dataend 0x0000026AC2227F80无符号字符*
• 数据限制0x000026AC2227F80无符号字符*
• datastart 0x0000026AC2146F80无符号字符* dims 2 int 标志1124024336 int 行480整数
• 大小{p=0x000000DBDFF0DE80}cv:：MatSize

• p 0x000000DBDFF0DE80 int* *（*cvImage）.size.p0 int

• 步骤{p=0x000000DBDFF0DEC8 buf={Length=2}}cv:：MatStep
• buf{Length=2}无符号_int64[]
• p 0x000000DBDFF0DEC8无符号\uuuu int64*
• u 0x0000026AA4814780 cv:：UMatData*
• 红色>>>>>>bmpImage 0x0000026aa62a1fd0{defaultTransparentColor=}系统：：绘图：：位图^
• 红色>>>>>>>系统：：绘图：：图像^0x0000026aa62a1fd0{nativeImage=2657511292512 rawData=userData=}系统：：绘图：：图像^ defaultTransparentColor系统：：绘图：：颜色 g系统：：绘图：：图形^
• 红色>>>>>>>>>pictureBox 0x0000026aa62a1388{borderStyle=System:：Windows:：Forms:：borderStyle:：None image=0x000026AA62A1FA0 sizeMode=System:：Windows:：Forms:：PictureBoxSizeMode:：Normal…}系统：：Windows:：Forms:：pictureBox^
• 红色>>>>>>系统：：Windows:：Forms:：Control^0x0000026aa62a1388{ControlKeyboardRouting=PaletteTracing=FocusTracing=…}系统：：Windows:：Forms:：Control^ AllowDrop假布尔 BorderStyle系统：：Windows:：Forms:：BorderStyle:：None系统：：Windows:：Forms:：BorderStyle 因果关系
• CreateParams 0x0000026aa62a15d8{className=caption=style=1442840576…}系统：：窗口：：窗体：：CreateParams^ 默认ImeMode系统：：Windows:：Forms:：ImeMode:：禁用系统：：Windows:：Forms:：ImeMode
• DefaultSize{Width=100 Height=50}系统：：绘图：：大小 事件大小已更改0x0000026aa629af50系统：：对象^
• ErrorImage 0x0000026aa629b110{nativeImage=2657511192608 rawData=userData=}系统：：绘图：：图像^
• Font 0x0000026aa6280148{}系统：：绘图：：Font^
• 前景色{RGB=0x0}系统：：绘图：：颜色
• 图像0x0000026aa62a1fa0{nativeImage=2657511290992 rawData=userData=}系统：：绘图：：图像^
• [系统：：绘图：：位图^0x0000026aa62a1fa0{defaultTransparentColor=}系统：：绘图：：位图^
• System:：MarshalByRefObject ^0x0000026aa62a1fa0{{u_identity=}System:：MarshalByRefObject^ 旗帜2整型
• FrameDimensionsList{Length=1}数组^ 高度480英寸 水平分辨率96.000000浮点
• 调色板0x0000026aa62a25e8{flags=1129621568条目的={Length=0}}系统：：绘图：：成像：：颜色调色板^
• 物理尺寸{宽度=640.00000高度=480.00000}系统：：绘图：：SizeF PixelFormat系统：：绘图：：成像：：PixelFormat：：Format32bppArgb系统：：绘图：：成像：：PixelFormat PropertyIdList{Length=0}数组^ PropertyItems{Length=0}数组^
• RawFormat 0x0000026aa62a3488{…}系统：：绘图：：成像：：图像格式^
• 尺寸{宽度=640高度=480}系统：：绘图：：尺寸 标记系统：：对象^ 垂直分辨率96.000000浮点 宽度640整数 国家图像2657511290992 原始数据数组^ 用户数据系统：：对象^ ImageLocation系统：：字符串^
• 图像矩形{X=0 Y=0宽度=640高度=480}系统：：绘图：：矩形 ImeMode系统：：Windows:：Forms:：ImeMode:：禁用系统：：Windows:：Forms:：ImeMode
• InitialImage 0x0000026aa629c568{nativeImage=2657511196256 rawData=userData=}系统：：绘图：：图像^ PICTUREBOXSTATE_异步操作进度1 int PICTUREBOXSTATE_取消挂起2 int PICTUREBOXSTATE_初始化64 int PICTUREBOXSTATE_需要加载图像位置32 int PICTUREBOXSTATE_useDefaultErrorImage 8 int PICTUREBOXSTATE_useDefaultInitialImage 4 int PICTUREBOXSTATE_waitOnLoad 16 int RightToLeft系统：：Windows:：Forms:：RightToLeft:：无系统：：Windows:：Forms:：RightToLeft SizeMode System:：Windows:：Forms:：PictureBoxSizeMode:：普通系统:：Windows:：Forms:：PictureBoxSizeMode TabIndex 1 int 止跳假波 文本“”系统：：字符串^ 等待加载假布尔 borderStyle系统：：Windows:：Forms:：borderStyle:：None系统：：Windows:：Forms:：borderStyle contentLength 0 int currentAsyncLoadOperation System:：ComponentModel:：AsyncOperation^ 当前animating假布尔
• defaultErrorImage 0x0000026aa629b110{nativeImage=2657

  private: System::Void button2_MouseClick(System::Object^  sender, System::Windows::Forms::MouseEventArgs^  e)
  {
      if (button2->Text == "Stop")
      {
          button2->Text = "Start";
  
      }
      else if (button2->Text == "Start")
      {
          button2->Text = "Stop";
  
      }
  
       VideoCapture capture(0);
       Mat frame;
  
       while (button2->Text == "Stop")
       {
           capture.read(frame);
           System::Drawing::Graphics^ graphics2 = pictureBox1->CreateGraphics();
           System::IntPtr ptr2(frame.ptr());
           System::Drawing::Bitmap^ b2 = gcnew System::Drawing::Bitmap(frame.cols,
               frame.rows, frame.step, System::Drawing::Imaging::PixelFormat::Format24bppRgb, ptr2);
           System::Drawing::RectangleF rect2(0, 0, pictureBox1->Width, pictureBox1->Height);
           graphics2->DrawImage(b2, rect2);
  
       }
   }