javascript - w 和 h 必须是数字

标签 javascript node.js azure azure-functions

我很难重新创建this例子。我得到以下输出:

2019-08-19T17:19:24.531 [Information] Executing 'Functions.PdfToTiffConverter' (Reason='EventGrid trigger fired at 2019-08-19T17:19:24.4859961+00:00', Id=161802cf-f5b9-4555-8e36-a9ca7e0daf91) 2019-08-19T17:20:26.112 [Information] Error: w and h must be numbers at Jimp.throwError (D:\home\site\wwwroot\node_modules@jimp\utils\dist\index.js:26:13) at Jimp.resize (D:\home\site\wwwroot\node_modules@jimp\plugin-resize\dist\index.js:38:36) at Jimp.read.then (D:\home\site\wwwroot\PdfToTiffConverter\index.js:14:19)

这是我的function.json:

{
  "disabled": false,
  "bindings": [
    {
      "type": "eventGridTrigger",
      "name": "myEvent",
      "direction": "in"
    },
    {
      "name": "myBlob",
      "type": "blob",
      "direction": "in",
      "path": "{data.url}",
      "connection": "AZURE_STORAGE_CONNECTION_STRING",
      "datatype": "binary"
    }
  ]
}

这是我正在使用的代码:

const stream = require('stream');
const Jimp = require('jimp');

const storage = require('azure-storage');
const blobService = storage.createBlobService();

module.exports = (context, myEvent, myBlob) => {

  const widthInPixels = process.env.THUMBNAIL_WIDTH;
  const blobName = myEvent.subject.split('/')[6];

    Jimp.read(myBlob).then((thumbnail) => {

        thumbnail.resize(widthInPixels, Jimp.AUTO);

        thumbnail.getBuffer(Jimp.MIME_PNG, (err, buffer) => {

            const readStream = stream.PassThrough();
            readStream.end(buffer);

            blobService.createBlockBlobFromStream('thumbnails', blobName, readStream, buffer.length, (err) => {
                context.done();
            });
        });

    }).catch(context.log);
};

我做错了什么？为什么我会遇到此异常？

最佳答案

就像@Pointy指出的那样，process.env.THUMBNAIL_WIDTH的值是一个字符串，而不是数字。