Building opencv example in OS X 10.8 with eclipse - eclipse

Question

I'm trying to build the following example using Eclipse in OS X 10.8:
//============================================================================
#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;
}
but getting this result:
**** Build of configuration Debug for project cvTesting ****
make all
Building file: ../src/cvTesting.cpp
Invoking: GCC C++ Compiler
g++ -I/opt/local/include/opencv -I/opt/local/include/opencv2 -I/opt/local/include/opencv2/core/ - I/opt/local/include/opencv2/highgui/ -O0 -g3 -Wall -c -fmessage-length=0 -MMD -MP -MF"src/cvTesting.d" -MT"src/cvTesting.d" -o "src/cvTesting.o" "../src/cvTesting.cpp"
../src/cvTesting.cpp:9:33: warning: opencv2/core/core.hpp: No such file or directory
../src/cvTesting.cpp:10:39: warning: opencv2/highgui/highgui.hpp: No such file or directory
../src/cvTesting.cpp:13: error: 'cv' is not a namespace-name
../src/cvTesting.cpp:13: error: expected namespace-name before ';' token
../src/cvTesting.cpp: In function 'int main(int, char**)':
../src/cvTesting.cpp:24: error: 'Mat' was not declared in this scope
../src/cvTesting.cpp:24: error: expected `;' before 'image'
../src/cvTesting.cpp:25: error: 'image' was not declared in this scope
../src/cvTesting.cpp:25: error: 'CV_LOAD_IMAGE_COLOR' was not declared in this scope
../src/cvTesting.cpp:25: error: 'imread' was not declared in this scope
../src/cvTesting.cpp:33: error: 'CV_WINDOW_AUTOSIZE' was not declared in this scope
../src/cvTesting.cpp:33: error: 'namedWindow' was not declared in this scope
../src/cvTesting.cpp:34: error: 'imshow' was not declared in this scope
../src/cvTesting.cpp:36: error: 'waitKey' was not declared in this scope
make: *** [src/cvTesting.o] Error 1
**** Build Finished ****
I have opencv installed such that pkg-config reports the following:
$ pkg-config opencv --cflags
-I/opt/local/include/opencv -I/opt/local/include
and
$ pkg-config --libs opencv
/opt/local/lib/libopencv_calib3d.dylib /opt/local/lib/libopencv_contrib.dylib /opt/local/lib/libopencv_core.dylib /opt/local/lib/libopencv_features2d.dylib /opt/local/lib/libopencv_flann.dylib /opt/local/lib/libopencv_gpu.dylib /opt/local/lib/libopencv_highgui.dylib /opt/local/lib/libopencv_imgproc.dylib /opt/local/lib/libopencv_legacy.dylib /opt/local/lib/libopencv_ml.dylib /opt/local/lib/libopencv_nonfree.dylib /opt/local/lib/libopencv_objdetect.dylib /opt/local/lib/libopencv_photo.dylib /opt/local/lib/libopencv_stitching.dylib /opt/local/lib/libopencv_ts.dylib /opt/local/lib/libopencv_video.dylib /opt/local/lib/libopencv_videostab.dylib
and within Eclipse, in the project properties I have, C/C++ Build -> Settings -> GCC C++ Compiler "All options" set to:
-I/opt/local/include/opencv -I/opt/local/include/opencv2 -O0 -g3 -Wall -c -fmessage-length=0
and the C/C++ Build -> Settings -> MacOS X C++ Linker -> "All options" is set to:
-L/opt/local/lib
I also have the following libraries (-l) listed in C/C++ Build -> Settings -> MacOS X C++ Linker -> Libraries:
opencv_core
opencv_imgproc
opencv_highgui
opencv_ml
opencv_video
opencv_features2d
opencv_calib3d
opencv_objdetect
opencv_contrib
opencv_legacy
opencv_flann
I am able to build this same example in Ubuntu, just not OS X. Can anyone help explain the setup for the paths used by eclipse in OS X, for opencv?

Answer 1

As you can see in the compiler output:
../src/cvTesting.cpp:9:33: warning: opencv2/core/core.hpp: No such file or directory
../src/cvTesting.cpp:10:39: warning: opencv2/highgui/highgui.hpp: No such file or directory
Eclipse can't find core.hpp and highgui.hpp files. Are you sure that those files are in these locations?
Also you may try to use core.h and highgui.h instead of *.hpp files.

Answer 2

After a lot more more research on the topic, and working through various options, I found the best approach to be using Xcode rather than Eclipse for the IDE while in OS X.
The information I used to get Xcode setup and working correctly is in the Answer posted here:
Compile OpenCV (2.3.1+) for OS X Lion / Mountain Lion with Xcode
Prior to doing this though, I went back through the Mac OS X OpenCV Port instructions found here:
http://opencv.willowgarage.com/wiki/Mac_OS_X_OpenCV_Port
Hope this helps others trying to use OpenCV with a modern IDE in OS X...
-Walt