cpdf_save_to_file
Description
bool cpdf_save_to_file ( int pdf_document, string filename)The cpdf_save_to_file() function outputs the pdf document into a file if it has been created in memory. 如果成功则返回 TRUE，失败则返回 FALSE。
This function is not needed if the pdf document has been open by specifying a filename as a parameter of cpdf_open().
See also cpdf_output_buffer() and cpdf_open().