How to permanently configure local opencv4.5.5 for vs2019

Preface ：

Due to actual development requirements , Need to put OpenCV original edition （ namely C and C++ Compiling ） Generate .dll( Dynamic link library ） for .Net Of C# Application usage , So we need to build a new one C++ Empty project to generate .dll. Therefore, it needs to be configured VS Tools and OpenCV The connection between , So make a special record and share experience , For your reference ！

Environmental Science ：windows10 pro +vs2019+opencv4.5.5

One , Download and install OpenCV

• If necessary , To specify the corresponding detailed version , It is suggested to go to the official website to download ！
• If you just browse the source code , You can go to GitHub Corresponding warehouse learning view ！

Click on The website links , Download the corresponding version you need to use , But what's worth noting here is , The version is not a random choice , To be used with you VS Version correspondence is good ！（ It is associated with the following configuration ） Reference to the corresponding version is given below （ Latest , The actual use will be different ）：

VC Version number	VS Corresponding version
vc6	VC6.0
vc7	VS2002
vc7.1	VS2003
vc8	VS2005
vc9	VS2008
vc10	VS2010
vc11	VS2012
vc12	VS2013
vc13	VS2014
vc14	VS2015
vc15	VS2017
vc16	VS2019

• After jumping out of the following interface , Automatically download files after accounting （ This version is about 200 many m）:
  
• After downloading , Open the installation file , And click unzip inside , Then automatically decompress ！
  
• After decompression , You can accomplish it ！
  
• Then you need to configure the environment variables of the system , Click OK after completing the following , It's better to restart it ！
  

Two , To configure vs

• stay vs2019 Next , New empty project ：
  
  
• Click View -> Other windows -> Property Manager
  
  As shown below , Right click on the Microsoft.Cpp.x64.user, It's normal if you don't have this choice （ I asked online vs2019 Most don't have this , It needs to be replaced with vs2017）, But there is a faster and more convenient way ： Will be Microsoft.Cpp.x64.user Your computer can copy and paste the relevant configuration files into the corresponding directory on your computer , Find the table of contents “C:\Users\“ Your username ”\AppData\Local\Microsoft”,（ Generally, it does not display AppData Folder , You need to check... In the folder view option “ Hidden items ” Make it visible ）. Will download okay file MSBuild（ Click to download ） Unzip and put it in the file directory ：
  

• If configured as Debug, choice opencv_world455d.lib
• If Release, choice opencv_world455.lib

stay demo.cpp Add the following code under the file ：

#include <opencv2/opencv.hpp>
#include "opencv2/imgcodecs/legacy/constants_c.h"

using namespace std;
using namespace cv;

void main(int argc, char* argv[]) {
    

    // Read the image from the file 
    Mat img = imread("D:\\Z-File\\cv\\1.jpg", 1);
    Mat dst;

    // If reading in the image fails 
    if (img.empty()) {
    
        printf(" Failed to open picture ！\n");
    }
    namedWindow("RGB", WINDOW_AUTOSIZE);
    imshow("RGB", img);
    cvtColor(img, dst, COLOR_BGR2GRAY);
    namedWindow("GRAY", WINDOW_AUTOSIZE);
    imshow("GRAY", dst);
    printf(" Test success ！ Succeed in putting rgb Convert image to grayscale image ！");
    // This function waits for the key to be pressed , Press any key on the keyboard to return to 
    waitKey(0);
}

The above code is mainly a RGB The original image is converted to a grayscale image , And print out the prompt of success and the window of two figures ！

Compile runtime , The following configuration is required ！

If , The configuration is successful ！

• After the above configuration is so successful , In the future, new projects don't need to be configured every time ！

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  Identifier not defined “CV_BGR2GRAY“

• The last thing I want to say is ,vs It's a big hole , Suggest using opencv and vs Not so new , Because the newer the words are vs The more difficult it is to configure , It is also recommended that you do not update to win11, Bigger pit , Finally installed successfully , You have to be roast MS Of ！
• If there are deficiencies in the text , it is respectful to have you criticize and correct sth ！