OpenCV hello world 没有像它应该的那样编译
我正在使用 OpenCV 2.3.1 设置一台新机器。机器是Windows 7盒子，我按照OpenCV网站给出的安装说明进行操作（使用CMake和MinGW来构建）。
这是我的代码：
#include <iostream>
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
int main() {
char var;
cv::Mat img;
img = cv::imread("C:/test/img.jpg");
cv::namedWindow("Image");
cv::imshow("Image", img);
std::cin >> var;
return 1;
}
这是我的 make 命令：
g++ -o main main.cpp -lopencv_core -lopencv_imgproc -lopencv_calib3d -lopencv_video -lopencv_features2d -lopencv_ml -lopencv_highgui -lopencv_objdetect -lopencv_contrib -lopencv_legacy
这是我的路径：
C:\OpenCV-2.3.1\install\bin;C:\OpenCV-2.3.1\install\include;C:\QtSDK\QtCreator\bin;C:\Program Files (x86)\MiKTeX 2.9\miktex\bin;%SystemRoot%\system32;%SystemRoot%;%SystemRoot%\System32\Wbem;%SYSTEMROOT%\System32\WindowsPowerShell\v1.0\;C:\Program Files (x86)\CMake 2.8\bin;C:\QtSDK\mingw\bin;
这是我的错误：
main.cpp:2:33: error: opencv2/core/core.hpp: No such file or directory
main.cpp:3:39: error: opencv2/highgui/highgui.hpp: No such file or directory
main.cpp: In function 'int main()':
main.cpp:8: error: 'cv' has not been declared
main.cpp:8: error: expected ';' before 'img'
main.cpp:9: error: 'img' was not declared in this scope
main.cpp:9: error: 'cv' has not been declared
main.cpp:10: error: 'cv' has not been declared
main.cpp:11: error: 'cv' has not been declared
这是没有意义的。为什么这不能编译？为什么找不到opencv2/core/core.hpp？
I am setting up a new machine with OpenCV 2.3.1. The machine is a Windows 7 box, and I followed the installation instructions given by the OpenCV website (used CMake with MinGW to build).
Here is my code:
#include <iostream>
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
int main() {
char var;
cv::Mat img;
img = cv::imread("C:/test/img.jpg");
cv::namedWindow("Image");
cv::imshow("Image", img);
std::cin >> var;
return 1;
}
Here is my make command:
g++ -o main main.cpp -lopencv_core -lopencv_imgproc -lopencv_calib3d -lopencv_video -lopencv_features2d -lopencv_ml -lopencv_highgui -lopencv_objdetect -lopencv_contrib -lopencv_legacy
Here is my path:
C:\OpenCV-2.3.1\install\bin;C:\OpenCV-2.3.1\install\include;C:\QtSDK\QtCreator\bin;C:\Program Files (x86)\MiKTeX 2.9\miktex\bin;%SystemRoot%\system32;%SystemRoot%;%SystemRoot%\System32\Wbem;%SYSTEMROOT%\System32\WindowsPowerShell\v1.0\;C:\Program Files (x86)\CMake 2.8\bin;C:\QtSDK\mingw\bin;
Here is my error:
main.cpp:2:33: error: opencv2/core/core.hpp: No such file or directory
main.cpp:3:39: error: opencv2/highgui/highgui.hpp: No such file or directory
main.cpp: In function 'int main()':
main.cpp:8: error: 'cv' has not been declared
main.cpp:8: error: expected ';' before 'img'
main.cpp:9: error: 'img' was not declared in this scope
main.cpp:9: error: 'cv' has not been declared
main.cpp:10: error: 'cv' has not been declared
main.cpp:11: error: 'cv' has not been declared
This is not making sense. Why won't this compile? Why can't it find opencv2/core/core.hpp?
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评论（3）
在查找包含文件时，
g++不考虑%PATH%（Unix 上的$PATH）。在编译命令中添加以下内容：
-IC:\OpenCV-2.3.1\install\include：g++doesn't consider%PATH%($PATHon Unix) when looking for include files.Add the following to the compilation command:
-IC:\OpenCV-2.3.1\install\include:您没有包含正确的 OpenCV 目录。
我在
C:\OpenCV2.3中安装了 OpenCV 的早期版本，这些是我必须为编译器添加以查找标头的路径：传统上，g++ 使用带有
-I标志的标头目录，您似乎根本没有使用该标志。You are not including the right OpenCV directories.
I made an installation of a previous version of OpenCV in
C:\OpenCV2.3, and these are the paths I had to add for my compiler to find the headers:Traditionally, g++ takes headers directories with the
-Iflag, which you doesn't seem to be using at all.在类似 UNIX 的操作系统上
（如果您要检查 blob，则 cvblob 是可选的）
on unix like os
(cvblob optional if you are checking for blob)