I am really new to Opencv. After downloading and installing Opencv 2.4 according to the instruction, I began writing my first Opencv program, which was basically a copy of the tutorial on the web.
#include <stdio.h>
#include <iostream>
#include <vector>
#include "cv.h"
#include "highgui.h"
#include <stdio.h>
#include <stdlib.h>
#include <opencv2/opencv.hpp>
using namespace std;
using namespace cv;
int main( int argc, char** argv )
{
char* filename = "C:\\Research\abc.pgm";
IplImage *img0;
if( (img0 = cvLoadImage(filename,-1)) == 0 )
return 0;
cvNamedWindow( "image", 0 );
cvShowImage( "image", img0 );
cvWaitKey(0);
cvDestroyWindow("image");
cvReleaseImage(&img0);
return 0;
}
The codes work very well, but you may notice that in the above code invoking Opencv function is in a C code fashion. I therefore decide to proceed with C++ code fashion with the following codes:
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <iostream>
using namespace cv;
using namespace std;
int main( int argc, char** argv )
{
if( argc != 2)
{
cout <<" Usage: display_image ImageToLoadAndDisplay" << endl;
return -1;
}
Mat image;
image = imread(argv[1], CV_LOAD_IMAGE_COLOR); // Read the file
if(! image.data ) // Check for invalid input
{
cout << "Could not open or find the image" << std::endl ;
return -1;
}
namedWindow( "Display window", CV_WINDOW_AUTOSIZE );// Create a window for display.
imshow( "Display window", image ); // Show our image inside it.
waitKey(0); // Wait for a keystroke in the window
return 0;
}
However, in this case the program has several link errors although compiling seems fine. The link errors I have received are as follows:
Error 2 error LNK2019: unresolved external symbol "void __cdecl cv::namedWindow(class stlp_std::basic_string<char,class stlp_std::char_traits<char>,class stlp_std::allocator<char> > const &,int)" (?namedWindow@cv@@YAXABV?$basic_string@DV?$char_traits@D@stlp_std@@V?$allocator@D@2@@stlp_std@@H@Z) referenced in function _main C:\Research\OpencvTest\OpencvTest.obj
Error 1 error LNK2019: unresolved external symbol "void __cdecl cv::imshow(class stlp_std::basic_string<char,class stlp_std::char_traits<char>,class stlp_std::allocator<char> > const &,class cv::_InputArray const &)" (?imshow@cv@@YAXABV?$basic_string@DV?$char_traits@D@stlp_std@@V?$allocator@D@2@@stlp_std@@ABV_InputArray@1@@Z) referenced in function _main C:\Research\OpencvTest\OpencvTest.obj
I am quite sure that I have added necessary Opencv libraries in my program (I use VC10), and the additional libraries I have added are as follows:
stl_port.lib
opencv_highgui242d.lib
opencv_core242d.lib
I was wondering what's wrong with my setting. Why does it work for the first program but not the second one? Any ideas will be appreciated. Thanks!
It has something to do with mixing STLPort and MSVC STL. You probably didn't build OpenCV libraries yourself, so they're using VC10 STL. With C interface there's just char*
but with C++ interface linker gets confused with std::string
in methods. You should see the same result with imread
if you cast it's input to string
too.
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