用JavaScript通过C++在加载Excel文件时获取警告信息
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可能的使用场景
有时，用户尝试加载一个或有损坏但仍可加载的工作簿。在这种情况下，Aspose.Cells 在加载工作簿时会发出警告。您可以通过实现 IWarningCallback 接口并设置 LoadOptions.warningCallback 属性来捕获这些警告。
加载 Excel 文件时获取警告
以下示例代码说明了如何在加载Excel文件时获取警告。代码加载会在加载时抛出 DuplicateDefinedName 警告的 示例Excel文件。这个警告由 IWarningCallback.warning(WarningInfo) 方法捕获，并在控制台输出警告信息。随后，代码将工作簿保存为 输出Excel文件。如果在Microsoft Excel中打开该示例文件，也会显示类似的警告。请同时查看下面的控制台输出以获取更多信息。
示例代码
<!DOCTYPE html>
<html>
<head>
<title>Aspose.Cells Warning Callback Example</title>
</head>
<body>
<h1>Aspose.Cells Warning Callback 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, LoadOptions, WarningType } = AsposeCells;
AsposeCells.onReady({
license: "/lic/aspose.cells.enc",
fontPath: "/fonts/",
fontList: [
"arial.ttf",
"NotoSansSC-Regular.ttf"
]
}).then(() => {
console.log("Aspose.Cells initialized");
});
// Implement IWarningCallback interface to catch warnings while loading workbook
class WarningCallback extends AsposeCells.IWarningCallback {
warning(warningInfo) {
if (warningInfo.type === AsposeCells.WarningType.DuplicateDefinedName) {
console.log("Duplicate Defined Name Warning: " + warningInfo.description);
}
}
}
document.getElementById('runExample').addEventListener('click', async () => {
const fileInput = document.getElementById('fileInput');
const resultDiv = document.getElementById('result');
if (!fileInput.files.length) {
resultDiv.innerHTML = '<p style="color: red;">Please select an Excel file.</p>';
return;
}
const file = fileInput.files[0];
const arrayBuffer = await file.arrayBuffer();
// Create load options and set the WarningCallback property
// to catch warnings while loading workbook
const options = new LoadOptions();
options.warningCallback = new WarningCallback();
// Load the source excel file
const workbook = new Workbook(new Uint8Array(arrayBuffer), options);
// Save the workbook and provide a download link
const outputData = workbook.save(SaveFormat.Xlsx);
const blob = new Blob([outputData]);
const downloadLink = document.getElementById('downloadLink');
downloadLink.href = URL.createObjectURL(blob);
downloadLink.download = 'outputDuplicateDefinedName.xlsx';
downloadLink.style.display = 'block';
downloadLink.textContent = 'Download Resulting Excel File';
resultDiv.innerHTML = '<p style="color: green;">Workbook processed successfully. Check console for warnings.</p>';
});
</script>
</html>
控制台输出
Duplicate Defined Name Warning: Name:PRINT_AREA;ReferTo:Introduction!$D$16:$D$17
Duplicate Defined Name Warning: Name:PRINT_AREA;ReferTo:Panel!$B$228
Duplicate Defined Name Warning: Name:PRINT_AREA;ReferTo:'Queries '!$D$14:$D$16