Opencv functions was not declared - opencv3.0

Question

I switched to new opencv 3.0 as it is newer and has more function, but I faced with a problem.
When I compile old code which was perfectly working on version 2.4.8, it could not find some function:
error: ‘resize’ was not declared in this scope
error: ‘VideoCapture’ was not declared in this scope
error: ‘namedWindow’ was not declared in this scope
error: ‘cvtColor’ was not declared in this scope
error: ‘imshow’ was not declared in this scope
error: ‘Sobel’ was not declared in this scope
here the small piece of code as an example:
test.cpp:
#include <opencv/highgui.h>
#include <opencv/cv.h>
using namespace cv;
int main( int argc, char** argv )
{
IplImage* imgX;
IplImage* img = cvLoadImage( argv[1] );
Sobel(img, imgX, CV_32F, 1, 0, 1);
cvNamedWindow( "Example1", CV_WINDOW_AUTOSIZE );
cvShowImage( "Example1", imgX );
cvWaitKey(0);
cvReleaseImage( &imgX );
cvDestroyWindow("Example1");
}
CMakeList.txt:
cmake_minimum_required (VERSION 2.6)
project (Test)
find_package( OpenCV REQUIRED )
add_executable(Test test.cpp)
target_link_libraries( Test ${OpenCV_LIBS} )
and output:
Scanning dependencies of target Test
[100%] Building CXX object CMakeFiles/Test.dir/test.cpp.o
/home/kairat/Dropbox/ComputerVision/Codes/test/test.cpp: In function ‘int main(int, char**)’:
/home/kairat/Dropbox/ComputerVision/Codes/test/test.cpp:11:34: error: ‘Sobel’ was not declared in this scope
Sobel(img, imgX, CV_32F, 1, 0, 1);
^
CMakeFiles/Test.dir/build.make:54: recipe for target 'CMakeFiles/Test.dir/test.cpp.o' failed
make[2]: *** [CMakeFiles/Test.dir/test.cpp.o] Error 1
CMakeFiles/Makefile2:60: recipe for target 'CMakeFiles/Test.dir/all' failed
make[1]: *** [CMakeFiles/Test.dir/all] Error 2
Makefile:75: recipe for target 'all' failed
make: *** [all] Error 2
What I could do in this situation?

Answer 1

Sobel(img, imgX, CV_32F, 1, 0, 1); this is c++ version of sobel function.
you should use c version of sobel function
i.e cvSobel(img, imgX,1, 0, 1); as you are dealing with C structure IPLimage.
Note:C version of opencv functions generally starts with "cv".
Otherwise convert your IPLimages to Mats using this function
Mat src = cvarrToMat(img) then use Sobel(src , srcX, CV_32F, 1, 0, 1);
it is recommended to use the c++ functions by dealing with Mats which has more advantages like automatic memory allocation/reallocation for outputs and automatic memory releasing.