tesseract makebox alternative

/*
 * build with:
 *    g++ -o makebox makebox.cpp -ltesseract
 * run with:
 *    ./makebox | sort -k 3nr -k 2n >zzz.box
 */

#include <tesseract/baseapi.h>
#include <leptonica/allheaders.h>

int main()
{
    Pix *image;
    BOX *box;
    l_int32 i, nwords;
    char *outText, *retStr;

    tesseract::TessBaseAPI *api = new tesseract::TessBaseAPI();

    api->Init("/usr/src/tesseract-3.02/", "eng");

    image = pixRead("/home/user/Download/zzz.tiff");
    api->SetImage(image);
    api->SetVariable("tessedit_char_whitelist","0123456789-.");

    Boxa* boxes = api->GetComponentImages(tesseract::RIL_SYMBOL, true, NULL, NULL);
    nwords = boxaGetCount(boxes);

    for (i = 0; i < nwords; i++) {
        box = boxaGetBox(boxes, i, L_CLONE);
        api->SetRectangle(box->x, box->y, box->w, box->h);
        outText = api->GetUTF8Text();
        //remove "\n" from outText
        if (strlen(outText)) {
            retStr = outText;
            retStr[strlen(outText)-2] = 0;
        }
        else retStr = 0;
        // print box style
        if (retStr)
            printf("%s %d %d %d %d 0\n", retStr,
                   box->x, image->h-(box->y + box->h),
                   box->x + box->w,  image->h-box->y);
    }

    api->End();
    delete [] outText, retStr;
    pixDestroy(&image);
    boxaDestroy(&boxes);
    return 0;
}