OpenCV 2.3编译问题 - 未定义的Refence - Ubuntu 11.10 [英] OpenCV 2.3 Compiling Issue - Undefined Refence - Ubuntu 11.10

问题描述

感谢您提供任何帮助...

系统信息：
Ubuntu 11.10（64位）使用OpenCV 2.3（今天安装）

我试图在OpenCV 2.3中编译一些非常简单的代码，但我得到一个奇怪的错误。

  #include< opencv2 / core / core.hpp> 
 #include< opencv2 / highgui / highgui.hpp> 
 
 int main（）{
 cv :: Mat image = cv :: imread（img.jpg）; 
 cv :: namedWindow（My Image）; 
 cv :: imshow（My Image，image）; 
 cv :: waitKey（0）; 
 return 1; 
} 
  

couldrrrrrrrrrrrr，我收到这些错误消息...

  -SG41：〜/ Desktop $ g ++`pkg-config opencv --cflags --libs`-o test_1 test_1.cpp 
 /tmp/ccCvS1ys.o：在函数main中：
 test_1.cpp :( .text + 0x44）：未定义引用`cv :: imread（std :: basic_string< char，std :: char_traits< char> ; std :: allocator< char>> const& int）'
 test_1.cpp :( .text + 0x8e）：未定义引用`cv :: namedWindow（std :: basic_string& ：char_traits< char>，std :: allocator< char>> const& int，'
 test_1.cpp :(文本+ 0xbc）：未定义的引用`cv :: _ InputArray :: _ InputArray ：mat const&）'
 test_1.cpp :(。text + 0xf0）：未定义的引用`cv :: imshow（std :: basic_string< char，std :: char_traits< char>，std :: allocator< char>> const& cv :: _ InputArray const&）'
 test_1.cpp :(。text + 0x112）：未定义引用`cv :: waitKey（int）'
 / tmp / ccCvS1ys .o：在函数`cv :: Mat ::` Mat（）'：
 test_1.cpp :( .text._ZN2cv3MatD2Ev [_ZN2cv3MatD5Ev] + 0x39）：未定义引用`cv :: fastFree '
 /tmp/ccCvS1ys.o：在函数`cv :: Mat :: release（）'：
 test_1.cpp :(。text._ZN2cv3Mat7releaseEv [cv :: Mat :: release（）] + 0x47）：未定义引用`cv :: Mat :: deallocate（）'
 collect2：ld返回1退出状态
  

$ b $我猜在

的输出中至少有一些库是   pkg-config opencv --libs 
  

是归档库。将归档库放在需要它们的源之前是不正确的（ test_1.cpp 在这种情况下）：链接行上的源和库的顺序

  g ++ -o test_1 test_1.cpp`pkg-config opencv --cflags --libs` 
  

Thanks in advance for any help...

System Info: Ubuntu 11.10 (64 bits) with OpenCV 2.3 (installed today)

I'm trying to compile some very simple code in OpenCV 2.3 but I'm getting a weird error.

#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>

int main(){
  cv::Mat image=cv::imread("img.jpg");
  cv::namedWindow("My Image");
  cv::imshow("My Image",image);
  cv::waitKey(0);
  return 1;
}

howeverrrrrrrrrrrrr, I'm getting these error messages...

-SG41:~/Desktop$ g++ `pkg-config opencv --cflags --libs` -o test_1 test_1.cpp 
/tmp/ccCvS1ys.o: In function `main':
test_1.cpp:(.text+0x44): undefined reference to `cv::imread(std::basic_string<char,    std::char_traits<char>, std::allocator<char> > const&, int)'
test_1.cpp:(.text+0x8e): undefined reference to `cv::namedWindow(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, int)'
test_1.cpp:(.text+0xbc): undefined reference to `cv::_InputArray::_InputArray(cv::Mat const&)'
test_1.cpp:(.text+0xf0): undefined reference to `cv::imshow(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, cv::_InputArray const&)'
test_1.cpp:(.text+0x112): undefined reference to `cv::waitKey(int)'
/tmp/ccCvS1ys.o: In function `cv::Mat::~Mat()':
test_1.cpp:(.text._ZN2cv3MatD2Ev[_ZN2cv3MatD5Ev]+0x39): undefined reference to `cv::fastFree(void*)'
/tmp/ccCvS1ys.o: In function `cv::Mat::release()':
test_1.cpp:(.text._ZN2cv3Mat7releaseEv[cv::Mat::release()]+0x47): undefined reference to `cv::Mat::deallocate()'
collect2: ld returned 1 exit status

解决方案

I am guessing that at least some of the libraries in the output of

pkg-config opencv --libs

are archive libraries. It is incorrect to put archive libraries before sources that need them (test_1.cpp in this case): the order of sources and libraries on the link line matters.

Try

g++ -o test_1 test_1.cpp `pkg-config opencv --cflags --libs` 

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