当操作时间过长时，使用InterruptMonitor停止转换或加载，采用C++中的JavaScript
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可能的使用场景
Aspose.Cells for JavaScript通过C++允许你在转换时间过长时，使用InterruptMonitor对象停止工作簿转换为各种格式。转换过程通常占用大量CPU和内存，当资源有限时停止是非常有用的。可以使用InterruptMonitor同时停止转换和加载大型工作簿。请使用Workbook.interruptMonitor属性停止转换，使用LoadOptions.interruptMonitor属性停止加载大型工作簿。
在转换或加载花费太长时间时使用InterruptMonitor停止转换或加载
以下示例代码解释了使用 InterruptMonitor 对象的用法。该代码将大型Excel文件转换为PDF。由于这些代码行的原因，转换需要几秒钟（即超过30秒）。
// Access cell J1000000 and add some text inside it.
let cell = ws.cells.get("J1000000");
cell.putValue("This is text.");
如你所见，J1000000 在 XLSX 文件中是一个较远的单元格。然而，waitForWhileAndThenInterrupt() 方法在 10 秒后中断转换，程序结束/终止。请使用以下代码运行示例。
new StopConversionOrLoadingUsingInterruptMonitor().testRun();
示例代码
<!DOCTYPE html>
<html>
<head>
<title>Aspose.Cells Example</title>
<meta charset="utf-8" />
</head>
<body>
<h1>Stop Conversion Using InterruptMonitor Example</h1>
<input type="file" id="fileInput" accept=".xls,.xlsx,.csv" />
<button id="runExample">Run Example</button>
<a id="downloadLink" style="display: none;">Download Result</a>
<div id="result"></div>
</body>
<script src="aspose.cells.js.min.js"></script>
<script type="text/javascript">
const { Workbook, SaveFormat, Utils, InterruptMonitor } = AsposeCells;
AsposeCells.onReady({
license: "/lic/aspose.cells.enc",
fontPath: "/fonts/",
fontList: [
"arial.ttf",
"NotoSansSC-Regular.ttf"
]
}).then(() => {
console.log("Aspose.Cells initialized");
});
class StopConversionOrLoadingUsingInterruptMonitor {
static outputDir = "output"; // browser uses filename directly
constructor() {
// Create InterruptMonitor object
this.im = new InterruptMonitor();
this._timeoutId = null;
}
// This function will create workbook and convert it to Pdf format
async createWorkbookAndConvertItToPdfFormat(monitorThread, fileUint8Array) {
// Create a workbook object
let wb;
if (fileUint8Array) {
// Opening the Excel file through the file stream
wb = new Workbook(fileUint8Array);
} else {
wb = new Workbook();
}
// Assign it InterruptMonitor object
wb.interruptMonitor = this.im;
// Access first worksheet
const ws = wb.worksheets.get(0);
// Access cell J1000000 and add some text inside it.
const cell = ws.cells.get("J1000000");
cell.value = "This is text.";
// Save the workbook to Pdf format (async) and provide download
const outputData = await wb.saveAsync(SaveFormat.Pdf);
const blob = new Blob([outputData], { type: "application/pdf" });
const downloadLink = document.getElementById('downloadLink');
downloadLink.href = URL.createObjectURL(blob);
downloadLink.download = 'output_InterruptMonitor.pdf';
downloadLink.style.display = 'block';
downloadLink.textContent = 'Download PDF File';
document.getElementById('result').innerHTML = '<p style="color: green;">Excel to PDF - Successful Conversion. Click the download link to get the PDF file.</p>';
// Stop monitor thread (clear scheduled interrupt)
if (monitorThread && typeof monitorThread.interrupt === 'function') {
monitorThread.interrupt();
}
}
// This function will interrupt the conversion process after 10s
waitForWhileAndThenInterrupt() {
// schedule an interrupt after 10 seconds
this._timeoutId = setTimeout(() => {
this.im.interrupt();
}, 1000 * 10);
// return a monitorThread object that can cancel the scheduled interrupt
return {
interrupt: () => {
if (this._timeoutId !== null) {
clearTimeout(this._timeoutId);
this._timeoutId = null;
}
}
};
}
async testRun(fileUint8Array) {
const monitorThread = this.waitForWhileAndThenInterrupt();
await this.createWorkbookAndConvertItToPdfFormat(monitorThread, fileUint8Array);
}
}
document.getElementById('runExample').addEventListener('click', async () => {
const fileInput = document.getElementById('fileInput');
const resultDiv = document.getElementById('result');
// Basic input validation: proceed even if no file (will create a new workbook)
let fileUint8Array = null;
if (fileInput.files && fileInput.files.length) {
const file = fileInput.files[0];
const arrayBuffer = await file.arrayBuffer();
fileUint8Array = new Uint8Array(arrayBuffer);
}
const example = new StopConversionOrLoadingUsingInterruptMonitor();
// Let errors propagate (no try-catch) as required
await example.testRun(fileUint8Array);
});
</script>
</html>