OpenCV 2.3 C++ Visual Studio 2010

I'm trying to use opencv 2.3 with Visual Studio 2010 Express. My code is from example:

#include "stdafx.h"
#include <highgui.h>

int _tmain(int argc, _TCHAR* argv[])
{
    int c;
    // allocate memory for an image
    IplImage *img;
    // capture from video device #1
    CvCapture* capture = cvCaptureFromCAM(1);
    // create a window to display the images
    cvNamedWindow("mainWin", CV_WINDOW_AUTOSIZE);
    // position the window
    cvMoveWindow("mainWin", 5, 5);
    while(1)
    {
        // retrieve the captured frame
        img=cvQueryFrame(capture);
        // show the image in the window
        cvShowImage("mainWin", img );
        // wait 10 ms for a key to be pressed
        c=cvWaitKey(10);
        // escape key terminates program
        if(c == 27)         
            break;
    }

    return 0;
}

What have I done so far?

• Added build\bin and one of build\{x86|x64}\{vc9\vc10\mingw}\bin to my system path (to use DLLs).
• Added build\{x86|x64}\{vc9\vc10\mingw}\lib or build\{x86|x64}\{vc9\vc10\mingw}\staticlib as library directories to my linker settings.
• Added build\include and build\include\opencv as include directories to my compiler settings.

And the result is:

1>LINK : fatal error LNK1104: cannot open file 'c:\OpenCV2.3\build\x86\vc10\lib.obj'

There's no lib.obj in OpenCV folders. I've only unziped OpenCV-2.3.0-win-superpack.exe, without using CMake software.

What am I doing wrong?

Answers:-

Well, the official guide is for installing OpenCV 2.1 on VS2010, so I wrote some instructions below that shows how to properly install and configure the x86 version of OpenCV 2.3 on Visual Studio 2010(Express), since a lot of folks seem to have problems setting it up correctly.

Download OpenCV-2.3.0-win-superpack.exe and execute it to extract all files to a folder namedOpenCV2.3. Inside this folder there are 2 directories: build and opencv. All the setup on VS2010 will refer to the build directory. For practical purposes I moved the folder OpenCV2.3 to my C:\drive, so pay attention to the paths I suggest on this guide as yours might be different.

On Visual Studio, create a new Win32 Console Application project and name it whatever you like. After that, a new window will show up. Click on the tab Application Settings and make sure the option Empty Project gets selected:

Add a new file main.cpp to the folder Source Files, then add this code to main.cpp:

#include <stdio.h>
#include <cv.h>
#include <highgui.h>

int main(int argc, char* argv[])
{
if (argc < 2)
{
    printf("Usage: ./opencv_hello <file.png>\n");
    return -1;
}

    IplImage* img = cvLoadImage(argv[1], CV_LOAD_IMAGE_UNCHANGED);
if (!img)
{
    return -1;
}

cvNamedWindow("display", CV_WINDOW_AUTOSIZE);
    cvShowImage("display", img );

    cvWaitKey(0);        

    return 0;
}

At this point, we need to configure the project so it can locate OpenCV headers and libraries. Go to the Project Properties (ALT+F7), and once the new window shows up do the following:

• On the Configuration box, select All Configurations
• Open Configuration Properties > C/C++ > General, and edit the field Additional Include Directories to add these 3 paths (for the headers):
  C:\OpenCV2.3\build\include\opencv
  C:\OpenCV2.3\build\include\opencv2
  C:\OpenCV2.3\build\include

Note that include\opencv is for the C interface of OpenCV and include\opencv2 if for the C++ interface. We are also adding the folder include to prevent our build from being broken by some headers of the C interface that refer to C++ headers as opencv2\core.

• Then, add the path of the libraries on Configuration Properties > Linker > General, and on theAdditional Library Directories field, add this: C:\OpenCV2.3\build\x86\vc9\lib:

• Finally, for this simple test we are going to add the libraries opencv_core230.lib andopencv_highgui230.lib. So go to Configuration Properties > Linker > Input and add them:

When writing more complex applications you'll probably need to add other OpenCV libs that I did not mentioned on this little project of ours.

Press F7 to Build Solution and you should see:

========== Build: 1 succeeded, 0 failed, 0 up-to-date, 0 skipped ==========

To be able to execute the application you'll need to modify the PATH environment variable of your system to add the location of OpenCV's DLLs. Add this to end of PATH:

; C:\OpenCV2.3\build\x86\vc9\bin