问题描述

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

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

我正在尝试在 OpenCV 2.3 中编译一些非常简单的代码，但出现了一个奇怪的错误.

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;
}

但是，我收到了这些错误消息...

however, 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

推荐答案

我猜至少有一些库在

pkg-config opencv --libs

是档案库.将存档库放在需要它们的源之前是不正确的(在这种情况下为 test_1.cpp):链接行上源和库的顺序 很重要.

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.

试试

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

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