Including External cpp file in OpenCV cpp Code - c++

Question

I am working on an Image Processing toolbox, that links OpenCV to Scilab, so that OpenCV functions can be used in Scilab directly. Now, my issue is that I have many functions that are used in all the other codes, so i decided to include those in an external cpp file, and include that in my other codes. What I did was, i made a header file common.h with the function definitions. common.c has the actual functions written. And all my other files, for e.g opencv_imcrop have a #include "common.h" along with the other included header files. However, when i compile this in Scilab using my builder gateway file(a .sce file that compiles my opencv_imcrop.cpp), it gives the following error:-
opencv_imcrop.cpp:14:22: fatal error: common.h: No such file or directory
compilation terminated.
This is my common.h file:-
#include "common.cpp"
string type2str(int type);
int no_of_channels(int type);
int retrieveImage(Mat &image);
int returnImage(char *checker,int &temp,Mat img);
This is my common.cpp file:-
string type2str(int type)
{
string r;
uchar depth = type & CV_MAT_DEPTH_MASK;
switch ( depth )
{
case CV_8U: r = "8U"; break;
case CV_8S: r = "8S"; break;
case CV_16U: r = "16U"; break;
case CV_16S: r = "16S"; break;
case CV_32S: r = "32S"; break;
case CV_32F: r = "32F"; break;
case CV_64F: r = "64F"; break;
default: r = "User"; break;
}
return r;
}
int no_of_channels(int type)
{
uchar chans = 1 + (type >> CV_CN_SHIFT);
return chans;
}
//Note : the other 2 functions are also present here, but they
// comprise of 800 lines of code, so i did not paste them here
My opencv_imcrop.cpp(The file that has to include the above made header file to use the functions) file is:-
#include <numeric>
#include "opencv2/core/core.hpp"
#include "opencv2/highgui/highgui.hpp"
#include "opencv2/opencv.hpp"
#include <iostream>
using namespace cv;
using namespace std;
extern "C"
{
#include "api_scilab.h"
#include "Scierror.h"
#include "BOOL.h"
#include <localization.h>
#include "common.h"
int opencv_imcrop(char *fname, unsigned long fname_len)
{
SciErr sciErr;
int iRows=0,iCols=0;
int *piAddr = NULL;
int *piAddrNew = NULL;
int *piAddr2 = NULL;
int *piAddr3 = NULL;
int *piAddr4 = NULL;
int *piAddr5 = NULL;
unsigned char *pstDataR = NULL;
unsigned char *pstDataG = NULL;
unsigned char *pstDataB = NULL;
int i,j,k;
double *x,*y,*width,*height;
//checking input argument
CheckInputArgument(pvApiCtx, 5, 5);
CheckOutputArgument(pvApiCtx, 1, 1) ;
Mat image;
retrieveImage(image);
//for value of top-left x-coordinate
sciErr = getVarAddressFromPosition(pvApiCtx,2,&piAddr2);
if (sciErr.iErr)
{
printError(&sciErr, 0);
return 0;
}
sciErr = getMatrixOfDouble(pvApiCtx, piAddr2, &iRows, &iCols ,&x);
if(sciErr.iErr)
{
printError(&sciErr, 0);
return 0;
}
//for value top-left y-coordinate
sciErr = getVarAddressFromPosition(pvApiCtx,3,&piAddr3);
if (sciErr.iErr)
{
printError(&sciErr, 0);
return 0;
}
sciErr = getMatrixOfDouble(pvApiCtx, piAddr3, &iRows, &iCols ,&y);
if(sciErr.iErr)
{
printError(&sciErr, 0);
return 0;
}
//for value of width
sciErr = getVarAddressFromPosition(pvApiCtx,4,&piAddr4);
if (sciErr.iErr)
{
printError(&sciErr, 0);
return 0;
}
sciErr = getMatrixOfDouble(pvApiCtx, piAddr4, &iRows, &iCols ,&width);
if(sciErr.iErr)
{
printError(&sciErr, 0);
return 0;
}
//for value of height
sciErr = getVarAddressFromPosition(pvApiCtx,5,&piAddr5);
if (sciErr.iErr)
{
printError(&sciErr, 0);
return 0;
}
sciErr = getMatrixOfDouble(pvApiCtx, piAddr5, &iRows, &iCols ,&height);
if(sciErr.iErr)
{
printError(&sciErr, 0);
return 0;
}
//defining a temporary rectangle, that denotes the area that has to be cropped into the new image
Rect myROI(x[0], y[0], width[0], height[0]);
// Crop the full image to that image contained by the rectangle myROI
// Note that this doesn't copy the data
Mat croppedRef(image, myROI);
Mat cropped;
// Copy the data into new matrix
croppedRef.copyTo(cropped);
int temp = nbInputArgument(pvApiCtx) + 1;
string tempstring = type2str(cropped.type());
char *checker;
checker = (char *)malloc(tempstring.size() + 1);
memcpy(checker, tempstring.c_str(), tempstring.size() + 1);
returnImage(checker,temp,cropped);
//Assigning the list as the Output Variable
AssignOutputVariable(pvApiCtx, 1) = nbInputArgument(pvApiCtx) + 1;
//Returning the Output Variables as arguments to the Scilab environment
ReturnArguments(pvApiCtx);
return 0;
}
/* ==================================================================== */
}
And finally, the .sce(builder_gateway_cpp.sce) file i execute in scilab to compile the above cpp file is as follows:-
function builder_gw_cpp()
WITHOUT_AUTO_PUTLHSVAR = %t;
tbx_build_gateway("skeleton_cpp69690", ..
["imcrop","opencv_imcrop"], ..
["opencv_imcrop.cpp"], ..
get_absolute_file_path("builder_gateway_cpp.sce"),[],"g++ -ggdb
`pkg-config --cflags opencv` -o `basename opencv_imcrop.cpp .cpp`
opencv_imcrop.cpp `pkg-config --libs opencv`");
endfunction
builder_gw_cpp();
clear builder_gw_cpp; // remove builder_gw_cpp on stack