หมุนไฟล์ PDF ใน JavaScript via C++

    var ffileRotateAllPages = function (e) {
        const file_reader = new FileReader();
        file_reader.onload = (event) => {
        /*Rotate PDF-pages PDF-file and save the "ResultRotation.pdf"*/
        const json = AsposePdfRotateAllPages(event.target.result, e.target.files[0].name, Module.Rotation.on270, "ResultRotation.pdf");
        if (json.errorCode == 0) document.getElementById('output').textContent = json.fileNameResult;
        else document.getElementById('output').textContent = json.errorText;
        /*Make a link to download the result file*/
        DownloadFile(json.fileNameResult, "application/pdf");
        };
        file_reader.readAsArrayBuffer(e.target.files[0]);
    };