visual studio 2019 图像监视：在Visual Studio调试器中查看内存中图像

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Image Watch是一款用于Visual Studio 2019的插件，可在调试C++应用时可视化内存中的图像。本文介绍了如何下载和安装Image Watch，以及如何在调试过程中利用它来观察和理解代码对图像的操作。步骤包括安装插件、设置项目以支持OpenCV图像，并在调试时通过Local窗口和Image Watch查看图像。

Image Watch is a plug-in for Microsoft Visual Studio that lets you to visualize in-memory images (cv::Mat or IplImage_ objects, for example) while debugging an application. This can be helpful for tracking down bugs, or for simply understanding what a given piece of code is doing.
总的来说Image Watch 就是一个debug时候对于图像的观察的窗口。

stepone:

1.download the Image Watch Installer for visual studio 2019,安装程序是一个单文件，文件的后缀名是.vsix。

The introduction of Image Watch Installer
Image Watch is a watch window for viewing in-memory bitmaps when debugging native C++ code.

The current version has built-in support for OpenCV image types (cv::Mat, cv::Mat_<>, CvMat, _IplImage). To enable user-defined image types please refer to the Image Watch documentation.

This version works with Visual Studio 2019.

Quick Start: Simply break in the debugger and select View > Other Windows > Image Watch. Alternatively, click on the magnifying glass icon next to an image variable in your Locals window or on the debugger Data Tip.

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==2double click on the .vsix file ==

3.when the installer has finished, make sure to restart Visual Studio to complete the installation.
关闭visual studio，安装完成后重新打开visual studio
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打开View Install Log,可以看到拓展程序的安装位置，已成功完成到 Visual Studio Community 2019 的安装。扩展已经安装到 C:\USERS\ADMINISTRATOR\APPDATA\LOCAL\MICROSOFT\VISUALSTUDIO\16.0_823E3688\EXTENSIONS\JQWAAQUV.YU4\

steptwo：

新建一个项目进行测试，window控制台项目
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stepthree:

1.对项目进行property sheet opencv的设置，参考,是对debug进行设置
2复制下面的代码：（这个程序中并设置窗口去显示图像，以此来测试这个ImageWatch ）因为是built-in

/ Test application for the Visual Studio Image Watch Debugger extension
#include <iostream>                        // std::cout
#include <opencv2/core/core.hpp>           // cv::Mat
#include <opencv2/imgcodecs/imgcodecs.hpp>     // cv::imread()
#include <opencv2/imgproc/imgproc.hpp>     // cv::Canny()
using namespace std;
using namespace cv;
void help()
{
    cout
        << "----------------------------------------------------" << endl
        << "This is a test program for the Image Watch Debugger " << endl
        << "plug-in for Visual Studio. The program loads an     " << endl
        << "image from a file and runs the Canny edge detector. " << endl
        << "No output is displayed or written to disk."
        << endl
        << "Usage:"                                               << endl
        << "image-watch-demo inputimage"                          << endl
        << "----------------------------------------------------" << endl
        << endl;
}
int main(int argc, char *argv[])
{
    help();
    if (argc != 2)
    {
        cout << "Wrong number of parameters" << endl;
        return -1;
    }
    cout << "Loading input image: " << argv[1] << endl;
    Mat input;
    input = imread(argv[1], IMREAD_COLOR);
    cout << "Detecting edges in input image" << endl;
    Mat edges;
    Canny(input, edges, 10, 100);
    return 0;
}

3对活动解决方案进行设置：
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4.因为程序中有char*argv[],所以要对add the command line argument of your input image to your project,，这个是这个程序的自己的独特之处而已

5.查看本地局部变量 Debug->Windows->Locals,就会出现上面的图那样
Note that the built-in Local window will display text only.

6.如果想要查看built-in 的图像形式， View->Other Windows->Image Watch
**Note that Image Watch is like Visual studio’s Local window. **
Visual Studio will remember whether you had Image Watch open, and where it was located between debugging sessions.
This means that you only have to do this once-the next time you start debugging, Image Watch will be back where you left.
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