未定义的引用cv::imread(std::string const&，int)

Question

我想在Qt中链接OpenCV。我做的所有步骤都是here，每一个步骤都是成功的。但是现在我有一些错误是在Linux中被here回答的，但是我找不到适用于Linux的答案。

下面是我的代码示例：

main.cpp

#include <opencv2/opencv.hpp>
#include "opencv2/imgproc/imgproc.hpp"
#include "opencv2/highgui/highgui.hpp"

int main(int argc, char *argv[])
{
    cv::Mat input;
    input = cv::imread("‪C:\\Users\\IS UEFI\\Desktop\\pelak_khali.jpg");
    QApplication a(argc, argv);
    QString plate = "";
    MainWindow w(plate);
    w.show();
    std::thread thread(chenges_on_plate, &w);
    int rc = a.exec();
    thread.join(); // wait for the thread to finish
    return rc;
}

.pro文件

INCLUDEPATH += D:\QtCommercial\opencv\opencv\build\include

CONFIG(release,debug|release)
{
LIBS += D:\QtCommercial\opencv\opencv\build\x86\vc10\lib\opencv_calib3d2411.lib \
        D:\QtCommercial\opencv\opencv\build\x86\vc10\lib\opencv_contrib2411.lib \
        D:\QtCommercial\opencv\opencv\build\x86\vc10\lib\opencv_core2411.lib \
        D:\QtCommercial\opencv\opencv\build\x86\vc10\lib\opencv_features2d2411.lib \
        D:\QtCommercial\opencv\opencv\build\x86\vc10\lib\opencv_flann2411.lib \
        D:\QtCommercial\opencv\opencv\build\x86\vc10\lib\opencv_gpu2411.lib \
        D:\QtCommercial\opencv\opencv\build\x86\vc10\lib\opencv_highgui2411.lib \
        D:\QtCommercial\opencv\opencv\build\x86\vc10\lib\opencv_imgproc2411.lib \
        D:\QtCommercial\opencv\opencv\build\x86\vc10\lib\opencv_legacy2411.lib \
        D:\QtCommercial\opencv\opencv\build\x86\vc10\lib\opencv_ml2411.lib \
        D:\QtCommercial\opencv\opencv\build\x86\vc10\lib\opencv_nonfree2411.lib \
        D:\QtCommercial\opencv\opencv\build\x86\vc10\lib\opencv_objdetect2411.lib \
        D:\QtCommercial\opencv\opencv\build\x86\vc10\lib\opencv_ocl2411.lib \
        D:\QtCommercial\opencv\opencv\build\x86\vc10\lib\opencv_photo2411.lib \
        D:\QtCommercial\opencv\opencv\build\x86\vc10\lib\opencv_stitching2411.lib \
        D:\QtCommercial\opencv\opencv\build\x86\vc10\lib\opencv_superres2411.lib \
        D:\QtCommercial\opencv\opencv\build\x86\vc10\lib\opencv_ts2411.lib \
        D:\QtCommercial\opencv\opencv\build\x86\vc10\lib\opencv_video2411.lib \
        D:\QtCommercial\opencv\opencv\build\x86\vc10\lib\opencv_videostab2411.lib
        }
CONFIG(debug,debug|release)
       {
LIBS += D:\QtCommercial\opencv\opencv\build\x86\vc10\lib\opencv_calib3d2411.lib \
        D:\QtCommercial\opencv\opencv\build\x86\vc10\lib\opencv_contrib2411.lib \
        D:\QtCommercial\opencv\opencv\build\x86\vc10\lib\opencv_core2411.lib \
        D:\QtCommercial\opencv\opencv\build\x86\vc10\lib\opencv_features2d2411.lib \
        D:\QtCommercial\opencv\opencv\build\x86\vc10\lib\opencv_flann2411.lib \
        D:\QtCommercial\opencv\opencv\build\x86\vc10\lib\opencv_gpu2411.lib \
        D:\QtCommercial\opencv\opencv\build\x86\vc10\lib\opencv_highgui2411.lib \
        D:\QtCommercial\opencv\opencv\build\x86\vc10\lib\opencv_imgproc2411.lib \
        D:\QtCommercial\opencv\opencv\build\x86\vc10\lib\opencv_legacy2411.lib \
        D:\QtCommercial\opencv\opencv\build\x86\vc10\lib\opencv_ml2411.lib \
        D:\QtCommercial\opencv\opencv\build\x86\vc10\lib\opencv_nonfree2411.lib \
        D:\QtCommercial\opencv\opencv\build\x86\vc10\lib\opencv_objdetect2411.lib \
        D:\QtCommercial\opencv\opencv\build\x86\vc10\lib\opencv_ocl2411.lib \
        D:\QtCommercial\opencv\opencv\build\x86\vc10\lib\opencv_photo2411.lib \
        D:\QtCommercial\opencv\opencv\build\x86\vc10\lib\opencv_stitching2411.lib \
        D:\QtCommercial\opencv\opencv\build\x86\vc10\lib\opencv_superres2411.lib \
        D:\QtCommercial\opencv\opencv\build\x86\vc10\lib\opencv_ts2411.lib \
        D:\QtCommercial\opencv\opencv\build\x86\vc10\lib\opencv_video2411.lib \
        D:\QtCommercial\opencv\opencv\build\x86\vc10\lib\opencv_videostab2411.lib
}

我正在链接所有的库，我使用"/“而不是"\”，但是它也不起作用。

我做了很多方法来修复它，但不幸的是他们帮不了我。

以下是我的错误：

error: undefined reference to `cv::imread(std::string const&, int)'
error: undefined reference to `cv::fastFree(void*)'
error: undefined reference to `cv::Mat::copySize(cv::Mat const&)'
error: undefined reference to `cv::Mat::deallocate()'

在你帮忙之前谢谢你。

Answer 1

您使用的所有C++代码都必须至少使用相同的编译器进行编译。一些编译器选项也必须是相同的--比如要使用的运行时库、是否启用RTTI等等。否则，您将得到一些库/对象，这些库/对象轻微地二进制不兼容，在最不需要的时候会以各种混乱的方式中断。

因此，Qt、OpenCV和您自己的代码必须用同一个编译器编译。不同的MSVC版本不兼容。用MSVC10编译的代码可能与MSVC11链接，但这并不意味着它将正确工作。所以，千万别那么做。

实际上，使用C++项目的二进制发行版是不值得的。编译您自己的Qt，您自己的OpenCV，并使用它们。您还可以使用符号信息对它们进行调试，因此您可以立即获得这方面的信息。没有别的办法了。