private static string RunOcr()
{
int res;
TNSOCR.Img_DeleteAllBlocks(ImgObj);
if (Frame.Width > 0)
{
Rectangle r = Frame;
int w, h;
TNSOCR.Img_GetSize(ImgObj, out w, out h);
if (r.X < 0)
{
r.X = 0;
}
if (r.Y < 0)
{
r.Y = 0;
}
if (r.Width > w)
{
r.Width = w;
}
if (r.Height > h)
{
r.Height = h;
}
int BlkObj;
res = TNSOCR.Img_AddBlock(ImgObj, r.Left, r.Top, r.Width, r.Height, out BlkObj);
if (res > TNSOCR.ERROR_FIRST)
{
ShowError("Img_AddBlock", res);
return(null);
}
//detect text block inversion
TNSOCR.Blk_Inversion(BlkObj, TNSOCR.BLK_INVERSE_DETECT);
Frame.Width = 0;
}
//zoning will not be executed since we have created text block
res = TNSOCR.Img_OCR(ImgObj, TNSOCR.OCRSTEP_ZONING, TNSOCR.OCRSTEP_LAST, 0);
if (res > TNSOCR.ERROR_FIRST)
{
ShowError("Img_OCR", res);
return(null);
}
int flags = TNSOCR.FMT_EDITCOPY; //or TNSOCR.FMT_EXACTCOPY
StringBuilder txt = new StringBuilder(0);
int n = TNSOCR.Img_GetImgText(ImgObj, txt, 0, flags); //get buffer text length plus null-terminated zero
txt = new StringBuilder(n + 1);
TNSOCR.Img_GetImgText(ImgObj, txt, n + 1, flags);
return(txt.ToString());
}