我已经回答了这个与Azure Webjob和调整存储为blob的图像大小有关的问题,因此我正在尝试使用Function App
进行同样的操作
每次上传一个新的blob时,我都会发送一条新的队列消息。我的函数由队列消息触发,并绑定到上传的blob。我还有一个第二个输入绑定,它绑定到另一个CloudBlobContainer,以便能够将新的调整大小的图像上传到其他blob容器。
我的函数是这样的:
#r "System.Web"
using System.IO;
using System.Web;
using ImageResizer;
using Microsoft.Azure.WebJobs;
using Microsoft.WindowsAzure;
using Microsoft.WindowsAzure.Storage;
using Microsoft.WindowsAzure.Storage.Blob;
private static readonly int[] Sizes = { 800, 500, 250 };
public static void Run(string filename, Stream blobStream, CloudBlobContainer container, TraceWriter log)
{
log.Verbose($"C# Queue trigger function processed: {filename}");
// Extract the filename and the file extension
var name = Path.GetFileNameWithoutExtension(filename);
var ext = Path.GetExtension(filename);
// Get the mime type to set the content type
var mimeType = MimeMapping.GetMimeMapping(filename);
foreach (var width in Sizes)
{
// Set the position of the input stream to the beginning.
blobStream.Seek(0, SeekOrigin.Begin);
// Get the output stream
var outputStream = new MemoryStream();
ResizeImage(blobStream, outputStream, width);
// Get the blob reference
CloudBlockBlob blob = container.GetBlockBlobReference($"{name}-w{width}.{ext}");
// Set the position of the output stream to the beginning.
outputStream.Seek(0, SeekOrigin.Begin);
blob.UploadFromStream(outputStream);
// Update the content type => don't know if required
blob.Properties.ContentType = mimeType;
blob.SetProperties();
}
}
private static void ResizeImage(Stream input, Stream output, int width)
{
var instructions = new Instructions
{
Width = width,
Mode = FitMode.Carve,
Scale = ScaleMode.Both
};
var imageJob = new ImageJob(input, output, instructions);
// Do not dispose the source object
imageJob.DisposeSourceObject = false;
imageJob.Build();
}
关联的function.json
文件:
{
"bindings": [
{
"queueName": "newfileuploaded",
"connection": "crazytunastorageaccount_STORAGE",
"name": "filename",
"type": "queueTrigger",
"direction": "in"
},
{
"path": "input-images/{queueTrigger}",
"connection": "crazytunastorageaccount_STORAGE",
"name": "blobStream",
"type": "blob",
"direction": "in"
},
{
"name": "container",
"type": "blob",
"path": "output-images",
"connection": "crazytunastorageaccount_STORAGE",
"direction": "in"
}
],
"disabled": false
}
和project.json
文件:
{
"frameworks": {
"net46":{
"dependencies": {
"ImageResizer": "4.0.5",
"WindowsAzure.Storage": "4.3.0"
}
}
}
}
现在,当我编译该函数时,我总是收到以下错误:
Microsoft.Azure.WebJobs.Host:索引方法"Functions.ResizeBlobImage"时出错。Microsoft.Azure.WebJobs.Host:无法将Blob绑定到类型"Microsoft.WindowsAzure.Storage.Blob.CloudBlobContainer".
目前支持这种类型吗?
是,支持CloudBlobContainer
。我现在自己尝试了一个快速示例,下面的函数对我有效,使用了与上面显示的相同的绑定元数据。我还在project.json
中使用相同版本的WebJobs SDK。
using System;
using Microsoft.WindowsAzure.Storage.Blob;
public static void Run(
string blobTrigger, Stream inputBlob, Stream outputBlob,
CloudBlobContainer container, TraceWriter log)
{
log.Info($"Container name: {container.Name}");
log.Info($"C# Blob trigger function processed {blobTrigger}");
inputBlob.CopyTo(outputBlob);
}
不知道为什么这对你不起作用。我不时看到一些门户故障(我们正在修复的错误),有时会导致问题。