xcode - 在 xcode 4.5.1 上链接库 OpenCV 2.4.2

Question

我已经按照此处的说明使用 macports 安装了 opencv:Compile OpenCV (2.3.1+) for OS X Lion / Mountain Lion with Xcode

我还在 stackexchange 和谷歌上搜索并尝试了这个的所有其他变体，但这似乎让我最接近。

它似乎适用于某些事情，但不适用于 2.4.2 附带的示例代码。请注意，我已经添加了所有 opencv 2.4.2 dylibs Link Binary with Libraries。

例如，下面会编译运行:

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

int main ( int argc, char **argv )
{
    cvNamedWindow( "My Window", 1 );
    IplImage *img = cvCreateImage( cvSize( 640, 480 ), IPL_DEPTH_8U, 1 );
    CvFont font;
    double hScale = 1.0;
    double vScale = 1.0;
    int lineWidth = 1;
    cvInitFont( &font, CV_FONT_HERSHEY_SIMPLEX | CV_FONT_ITALIC,
           hScale, vScale, 0, lineWidth );
    cvPutText( img, "Hello World!", cvPoint( 200, 400 ), &font,
          cvScalar( 255, 255, 0 ) );
    cvShowImage( "My Window", img );
    cvWaitKey();
    return 0;
}

但是，当我尝试构建任何示例(例如 display_image.cpp，示例，如下所示)时，出现链接错误。

-不工作-

 #include <stdio.h>
 #include <iostream>
 #include "opencv2/imgproc/imgproc.hpp"
 #include "opencv2/highgui/highgui.hpp"
 #include "opencv2/flann/miniflann.hpp"

 using namespace cv; // all the new API is put into "cv" namespace. Export its content
 using namespace std;
 using namespace cv::flann;

static void help()
{
    cout <<
    "\nThis program shows how to use cv::Mat and IplImages converting back and forth.\n"
    "It shows reading of images, converting to planes and merging back, color conversion\n"
    "and also iterating through pixels.\n"
    "Call:\n"
    "./image [image-name Default: lena.jpg]\n" << endl;
}

int main(int argc, char *argv[])
{
    help();
    const char* imagename = argc > 1 ? argv[1] : "lena.jpg";
    Mat img = imread(imagename); // the newer cvLoadImage alternative, MATLAB-style function
    if(img.empty())
    {
        fprintf(stderr, "Can not load image %s\n", imagename);
        return -1;
    }
    if( !img.data ) // check if the image has been loaded properly
        return -1;

    Mat img_yuv;
    cvtColor(img, img_yuv, CV_BGR2YCrCb); // convert image to YUV color space. The output image will be created automatically

    vector<Mat> planes; // Vector is template vector class, similar to STL's vector. It can store matrices too.
    split(img_yuv, planes); // split the image into separate color planes

    imshow("image with grain", img);

    waitKey();

    return 0;

}

---

我收到以下错误:

Undefined symbols for architecture x86_64:
 "cv::split(cv::Mat const&, std::__1::vector<cv::Mat, std::__1::allocator<cv::Mat> >&)", referenced from:
  _main in main1.o
 "cv::imread(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, int)", referenced from:
  _main in main1.o
 "cv::imshow(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, cv::_InputArray const&)", referenced from:
  _main in main1.o
 ld: symbol(s) not found for architecture x86_64
 clang: error: linker command failed with exit code 1 (use -v to see invocation)

知道如何解决这个问题吗？

Answer 1

我遇到了同样的问题。 Xcode 4.5 中的build设置默认值似乎有所不同。

在“Build Settings”下--> Apple LLVM compiler 4.1 - Language >

C++ 标准库:=从 libc++ (LLVM ...) 更改为 libstdc++ (GNU C++ ...)。