# 建置VScode的C++及OpenCV環境 by076

## Step 1: 下載VScode Windows x64 Stable

:::info
https://code.visualstudio.com/
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## Step 2: 下載Mingw64

:::info
https://nchc.dl.sourceforge.net/project/mingw-w64/Toolchains%20targetting%20Win64/Personal%20Builds/mingw-builds/8.1.0/threads-posix/seh/x86_64-8.1.0-release-posix-seh-rt_v6-rev0.7z
:::

## Step 3: 下載OpenCV

:::info
https://drive.google.com/file/d/1UXtVSnCI7BTCAYuYgf2GQph7flR-UqGj/view?usp=sharing
:::

## Step4: 建置環境變數

graph LR
    編輯系統環境變數:::someclass --> 環境變數 
    classDef someclass fill;
    環境變數:::someclass --> 系統變數 
    classDef someclass fill;
    系統變數:::someclass --> Path 
    classDef someclass fill;
    Path:::someclass --> 新增Mingw的bin路徑 
    classDef someclass fill;
    新增Mingw的bin路徑:::someclass --> 新增OpenCV的bin路徑 
    classDef someclass fill;

:::info
編輯系統環境變數➜ 環境變數 ➜ 系統變數 ➜ Path ➜ 新增 Mingw的bin路徑 (ex: D:\APP\Mingw\mingw64\bin) ➜ 新增OpenCV的bin路徑 (ex: D:\APP\Opencv\build\bin)
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## Step5: 把OpenCV裡的include和lib分別複製到mingw64中的include和lib

:::info
- include
>D:\APP\Opencv\build\include內的"opencv2"文件複製到 D:\APP\Mingw\mingw64\include
- lib
>D:\APP\Opencv\build\lib 內的 "全部資料"複製到 D:\APP\Mingw\mingw64\lib
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## Step6: 建置一個資料夾並建立test.cpp，在資料夾中右鍵"以Code開啟"


## Step7: 點開test.cpp，貼上範例程式
- **include出現紅線先呼略啦**
- **test.png記得準備啦**

#include "opencv2/opencv.hpp" 
#include "iostream" 
 
int main(int argc, char const *argv[]) 
{ 
    cv::Mat img = cv::imread("test.png"); 
    if (img.empty()) 
        std::cout << "image is empty or the path is invalid!" << std::endl; 
    cv::imshow("Origin", img); 
    cv::waitKey(0); 
    cv::destroyAllWindows(); 
    return 0; 
} 

### :pushpin: Hint: 終端機的開法


## Step8: 測試時間

- ### 打在終端機上
:::info
g++ -g test.cpp -I <font color=red>D:\\\\APP\\\\Mingw\\\\mingw64\\\\include</font> -lopencv_core452 -lopencv_imgcodecs452 -lopencv_imgproc452 -lopencv_calib3d452 -lopencv_dnn452 -lopencv_features2d452 -lopencv_flann452 -lopencv_gapi452 -lopencv_highgui452 -lopencv_ml452 -lopencv_objdetect452 -lopencv_photo452 -lopencv_stitching452 -lopencv_video452 -lopencv_videoio452 -o test.exe

<font color=red> 紅色的地方改成自己mingw64 include路徑 </font>
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## Step9: 執行資料夾內生成的test.exe
- ### 成功顯示test.png ➜ 測試成功

## Step10: 在Coding用資料夾內建立名為.vscode的資料夾，在裡面新增tasks.json

## Step11: 撰寫tasks.json

- ### 從範例修改
:::info
https://drive.google.com/file/d/11YXBBIR8iFmvafgwSsAu7J7pzxvkYABR/view?usp=sharing
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## Step12: 存檔後到test.cpp執行結果，有以下兩種方式:

:::info
>### **1. Shift+ctrl+B : 只編譯出exe檔，要再手動執行exe。**
>
>### **2.** 
>### **案下去就會編譯加執行exe啦!!**

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### **:pushpin: Hint: 若出現此現象，則選擇g++編譯器**

## <補充>: 出現紅線 (ex: include出現紅線) 的解決辦法

### 1. **使用shift+ctrl+P叫出搜尋欄，輸入C++ config**

### 2. **修改內文**