在Python SDK中向PDF的页眉添加文本

    import shutil
    import json
    import logging
    from pathlib import Path
    from asposepdfcloud import ApiClient, PdfApi, TextHeader, HorizontalAlignment, TextHorizontalAlignment

    # Configure logging
    logging.basicConfig(level=logging.INFO, format="%(asctime)s - %(levelname)s - %(message)s")

    class Config:
        """Configuration parameters."""
        CREDENTIALS_FILE = Path(r"C:\\Projects\\ASPOSE\\Pdf.Cloud\\Credentials\\credentials.json")
        LOCAL_FOLDER = Path(r"C:\Samples")
        PDF_DOCUMENT_NAME = "sample.pdf"
        LOCAL_RESULT_DOCUMENT_NAME = "output_sample.pdf"
        HEADER_VALUE = "New header Value"
        PAGE_NUMBER = 2

    class pdfHederFooter:
        """Class for managing PDF headers and footers using Aspose PDF Cloud API."""
        def __init__(self, credentials_file: Path = Config.CREDENTIALS_FILE):
            self.pdf_api = None
            self._init_api(credentials_file)

        def _init_api(self, credentials_file: Path):
            """Initialize the API client."""
            try:
                with credentials_file.open("r", encoding="utf-8") as file:
                    credentials = json.load(file)
                    api_key, app_id = credentials.get("key"), credentials.get("id")
                    if not api_key or not app_id:
                        raise ValueError("init_api(): Error: Missing API keys in the credentials file.")
                    self.pdf_api = PdfApi(ApiClient(api_key, app_id))
            except (FileNotFoundError, json.JSONDecodeError, ValueError) as e:
                logging.error(f"init_api(): Failed to load credentials: {e}")

        def upload_document(self):
            """ Upload a PDF document to the Aspose Cloud server. """
            if self.pdf_api:
                file_path = Config.LOCAL_FOLDER / Config.PDF_DOCUMENT_NAME
                try:
                    self.pdf_api.upload_file(Config.PDF_DOCUMENT_NAME, str(file_path))
                    logging.info(f"upload_document(): File {Config.PDF_DOCUMENT_NAME} uploaded successfully.")
                except Exception as e:
                    logging.error(f"upload_document(): Failed to upload file: {e}")

        def download_result(self):
            """ Download the processed PDF document from the Aspose Cloud server. """
            if self.pdf_api:
                try:
                    temp_file = self.pdf_api.download_file(Config.PDF_DOCUMENT_NAME)
                    local_path = Config.LOCAL_FOLDER / Config.LOCAL_RESULT_DOCUMENT_NAME
                    shutil.move(temp_file, str(local_path))
                    logging.info(f"download_result(): File successfully downloaded: {local_path}")
                except Exception as e:
                    logging.error(f"download_result(): Failed to download file: {e}")

        def append_text_header(self):
            """Append a new text header to the PDF document."""
            if self.pdf_api:
                new_header = TextHeader(
                    background = True,
                    horizontal_alignment = HorizontalAlignment.CENTER,
                    text_alignment = TextHorizontalAlignment.CENTER,
                    value = Config.HEADER_VALUE
                )

                try:
                    response = self.pdf_api.post_document_text_header(
                        Config.PDF_DOCUMENT_NAME, new_header
                    )
                    if response.code == 200:
                        logging.info(f"append_text_header(): Header '{new_header.value}' added to the document '{Config.PDF_DOCUMENT_NAME}'.")
                    else:
                        logging.error(f"append_text_header(): Failed to add header '{new_header.value}' to the document '{Config.PDF_DOCUMENT_NAME}'. Response code: {response.code}")
                except Exception as e:
                    logging.error(f"append_text_header(): Error while adding header: {e}")

        def append_text_header_page(self):
            """Append a new text header to the page on PDF document."""
            if self.pdf_api:
                new_header = TextHeader(
                    background = True,
                    horizontal_alignment = HorizontalAlignment.LEFT,
                    text_alignment = TextHorizontalAlignment.CENTER,
                    value = Config.HEADER_VALUE
                )

                try:
                    response = self.pdf_api.post_document_text_header(
                        Config.PDF_DOCUMENT_NAME, new_header, start_page_number=Config.PAGE_NUMBER, end_page_number=Config.PAGE_NUMBER
                    )
                    if response.code == 200:
                        logging.info(f"append_text_header_page(): Header '{new_header.value}' added to the page #{Config.PAGE_NUMBER}.")
                    else:
                        logging.error(f"append_text_header_page(): Failed to add header '{new_header.value}' to the document #{Config.PAGE_NUMBER}. Response code: {response.code}")
                except Exception as e:
                    logging.error(f"append_text_header_page(): Error while adding header: {e}")


    if __name__ == "__main__":
        pdf_header_footer = pdfHederFooter()
        pdf_header_footer.upload_document()
        pdf_header_footer.append_text_header()
        pdf_header_footer.append_text_header_page()
        pdf_header_footer.download_result()