在 Node.js SDK 中从 PDF 提取页面

    import credentials from "./credentials.json"  with { type: "json" };
    import fs from 'node:fs/promises';
    import path from 'node:path';
    import { PdfApi } from "asposepdfcloud";

    const configParams = {
        LOCAL_FOLDER: "C:\\Samples\\",
        PDF_DOCUMENT_NAME: "sample.pdf",
        LOCAL_RESULT_DOCUMENT_NAME: "output_sample.pdf",
        PAGE_NUMBER: 2,     // Your document page number...
    };

    const pdfApi = new PdfApi(credentials.id, credentials.key);

    const pdfPages = {
        async uploadDocument () {
            const fileNamePath = path.join(configParams.LOCAL_FOLDER, configParams.PDF_DOCUMENT_NAME);
            const pdfFileData = await fs.readFile(fileNamePath);
            await pdfApi.uploadFile(configParams.PDF_DOCUMENT_NAME, pdfFileData);
        },
            
        async downloadResult () {
            const changedPdfData = await pdfApi.downloadFile(configParams.PDF_DOCUMENT_NAME);
            const filePath = path.join(configParams.LOCAL_FOLDER, configParams.LOCAL_RESULT_DOCUMENT_NAME);
            await fs.writeFile(filePath, changedPdfData.body);
            console.log("Downloaded: " + filePath);
        },

        async getPagesInfo () {
            const resultPages = await pdfApi.getPages(configParams.PDF_DOCUMENT_NAME);

            if (resultPages.body.code == 200 && resultPages.body.pages.list) {
                this.showPages(resultPages.body.pages.list, "pages");
                return resultPages.body.pages.list;
            }
            else
                console.error("Unexpected error : can't get pages!!!");
        },

        async getPageInfo (pageNumber) {
            const resultPages = await pdfApi.getPage(configParams.PDF_DOCUMENT_NAME, pageNumber);

            if (resultPages.body.code == 200 && resultPages.body.page) {
                this.showPages( [ resultPages.body.page ], "page");
                return resultPages.body.page;
            }
            else
                console.error("Unexpected error : can't get pages!!!");
        },

        showPages (pages, prefix) {
            if (Array.isArray(pages) && pages.length > 0)
            {
                pages.forEach(function(page) {
                    console.log(prefix +" => id: '" + page.id + "', lLx: '" + page.rectangle.lLX + "', lLY: '" + page.rectangle.lLY + "', uRX: '" + page.rectangle.uRX + "', uRY: '" + page.rectangle.uRY + "'");
                });
            }
            else
                console.error("showPages() error: array of pages is empty!")
        },
    }

    async function main() {
        try {
            await pdfPages.uploadDocument();
            await pdfPages.getPagesInfo();
            await pdfPages.getPageInfo(configParams.PAGE_NUMBER);
        } catch (error) {
            console.error("Error:", error.message);
        }
    }