_freeimage.py 文件源码

def get_page(self, index):
        """ Return the sub-bitmap for the given page index.
        Please close the returned bitmap when done.
        """ 
        with self._fi as lib:

            # Create low-level bitmap in freeimage
            bitmap = lib.FreeImage_LockPage(self._bitmap, index)
            bitmap = ctypes.c_void_p(bitmap)
            if not bitmap:  # pragma: no cover
                raise ValueError('Could not open sub-image %i in %r: %s' % 
                                 (index, self._filename, 
                                  self._fi._get_error_message()))

            # Get bitmap object to wrap this bitmap
            bm = FIBitmap(self._fi, self._filename, self._ftype, self._flags)
            bm._set_bitmap(bitmap, (lib.FreeImage_UnlockPage, self._bitmap, 
                           bitmap, False))
            return bm