__init__.py 文件源码

def script_ocrNavigatorObject(self, gesture):
        nav = api.getNavigatorObject()
        left, top, width, height = nav.location
        img = ImageGrab.grab(bbox=(left, top, left + width, top + height))
        # Tesseract copes better if we convert to black and white...
        img = img.convert(mode='L')
        # and increase the size.
        img = img.resize((width * IMAGE_RESIZE_FACTOR, height * IMAGE_RESIZE_FACTOR), Image.BICUBIC)
        baseFile = os.path.join(tempfile.gettempdir(), "nvda_ocr")
        try:
            imgFile = baseFile + ".bmp"
            img.save(imgFile)

            ui.message(_("Running OCR"))
            lang = getConfig()['language']
            # Hide the Tesseract window.
            si = subprocess.STARTUPINFO()
            si.dwFlags = subprocess.STARTF_USESHOWWINDOW
            si.wShowWindow = subprocess.SW_HIDE
            subprocess.check_call((TESSERACT_EXE, imgFile, baseFile, "-l", lang, "hocr"),
                startupinfo=si)
        finally:
            try:
                os.remove(imgFile)
            except OSError:
                pass
        try:
            hocrFile = baseFile + ".html"

            parser = HocrParser(file(hocrFile).read(),
                left, top)
        finally:
            try:
                os.remove(hocrFile)
            except OSError:
                pass

        # Let the user review the OCR output.
        nav.makeTextInfo = lambda position: OcrTextInfo(nav, position, parser)
        api.setReviewPosition(nav.makeTextInfo(textInfos.POSITION_FIRST))
        ui.message(_("Done"))