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C Programming Examples

All WiT operators are implemented as C functions in DLLs. So if you are more comfortable with writing your own C/C++ programs, you can use the WiT libraries for image processing and analysis directly from you C/C++ program. The programming API for WiT operator functions are very natural for C programming and are fully documented. You can use WiT for prototyping, then use the C code generator to generate code that you can insert into your C/C++ application. You can also bypass the entire WiT and igraph concept and code directly in C right from the beginning. The following is a trivial yet complete example console application using WiT libraries:

#include "corObj.h"
#include "wSystem.h"

main(void)
{
    CorImage im;
    
    CorObjInit(NULL, NULL);
    if (cor_rdImage(&im, "../data/sample2.bmp", 0) != COR_OP_OK) {
        printf("Failed\n");
    } else {
        int x, y;
        CorUByte min, max;
        int w = CorObj_width(&im);
        int h = CorObj_height(&im);
        CorUByte *ip = CorObj_mdData(&im);

        min = max = *ip;
        for (y=0; y<h; ++y) {
            for (x=0; x<w; ++x) {
                if (*ip < min) min = *ip;
                if (*ip > max) max = *ip;
                ++ip;
            }
        }
        printf("Size: %dx%d, range: %d-%d\n",
            w, h, min, max);
        CorImageFree(&im);
    }
    CorObjExit();
}

Even acquiring images is easy. The following example shows how to acquire one frame using a DirectShow compatible camera and writing the image out as a BMP file:

#include "CorObj.h"
#include "wdShow.h"
#include "wSystem.h"

void main(void)
{
    CorLibCaps dsCaps;
    CorContext context;
    GFrame mf;
    CorObj im;
    
    mf = CorGuiInit(NULL, NULL);
    dShowOpen(mf, &dsCaps);
    context.libContext = dsCaps.contexts[0];
    context.opContext = NULL;
    dShowAcquire(&context, &im, NULL, 1, 0);
    cor_writeImage(((CorImage *)(CorObj_image(&im))),
    	"grab.bmp", 5, 0, 0, 75, 0, 0, 2, 0, 1);
    CorObjRelease(&im);
    dShowClose(&dsCaps);
    CorGuiExit(mf);
}