将文件从 Flex 上传到 WCF REST Stream 问题(如何在 REST WS 中解码多部分表单发布) [英] Uploading file from Flex to WCF REST Stream issues (how to decode multipart form post in REST WS)

问题描述

该系统是一个与 WCF REST Web 服务通信的 Flex 应用程序.我正在尝试将文件从 Flex 应用程序上传到服务器，但遇到了一些问题，希望这里有人能够提供帮助.我在 Flex 应用程序中使用 FileReference 来浏览和上传此处定义的文件:

The system is a Flex application communicating with a WCF REST web service. I am trying to upload a file from the Flex application to the server and am running into some issues I'm hoping someone here will be able to help out with. I'm using a FileReference in the Flex app to browse and upload the file as defined here:

http://blog.flexexamples.com/2007/09/21/uploading-files-in-flex-using-the-filereference-class/

然后我在 WCF REST Web 服务(使用 WCF 4 REST 服务的项目类型)中以流的形式接收文件(在调试器中显示为 System.ServiceModel.Dispatcher.StreamFormatter.MessageBodyStream)

I am then receiving the file as a Stream (shows as System.ServiceModel.Dispatcher.StreamFormatter.MessageBodyStream in the debugger) in the WCF REST web service (using project type of WCF 4 REST Service)

[WebInvoke(Method = "POST", UriTemplate = "_test/upload")]
public void UploadImage(Stream data)
{
    // TODO: just hardcode filename for now
    var filepath = HttpContext.Current.Server.MapPath(@"~\_test\testfile.txt");
    using (Stream file = File.OpenWrite(filepath))
    {
        CopyStream(data, file);
    }
}
private static void CopyStream(Stream input, Stream output)
{
    var buffer = new byte[8 * 1024];
    int len;
    while ((len = input.Read(buffer, 0, buffer.Length)) > 0)
    {
        output.Write(buffer, 0, len);
    }
}

注意:本文使用的 CopyStream 方法:How do我在 C# 中将流保存到文件中?

Note: CopyStream method used from this post: How do I save a stream to a file in C#?

文件保存没有任何问题.我的问题是该文件包含的信息比我想要的多.以下是保存文件的内容(其中源文件仅包含这是文件的内容"):

The file saves without any issues. The issue I have is that the file contains more information than i would like. Here are the contents of the saved file (where the source file only contained "THIS IS THE CONTENT OF THE FILE"):

------------ae0ae0Ef1ae0Ef1ae0gL6gL6Ij5cH2
Content-Disposition: form-data; name="Filename"

testfile.txt
------------ae0ae0Ef1ae0Ef1ae0gL6gL6Ij5cH2
Content-Disposition: form-data; name="Filedata"; filename="testfile.txt"
Content-Type: application/octet-stream

THIS IS THE CONTENT OF THE FILE
------------ae0ae0Ef1ae0Ef1ae0gL6gL6Ij5cH2
Content-Disposition: form-data; name="Upload"

Submit Query
------------ae0ae0Ef1ae0Ef1ae0gL6gL6Ij5cH2--

内容与 Adob​​e 文档中描述的完全相同:http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/flash/net/FileReference.html

The contents look exactly like they are described in the Adobe documentation: http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/flash/net/FileReference.html

C# 中是否有任何工具可以从 Stream 中获取文件内容?

Are there any facilities in C# to get the file contents from the Stream?

编辑(3/24 8:15 pm):Flex 应用程序发送的是多部分表单 POST.如何解码由 Stream 参数表示的多部分正文数据并剥离多部分正文的片段?

EDIT (3/24 8:15 pm): What the Flex app is sending is a Multipart form POST. How can I decode the multipart body data as represented by the Stream parameter and strip out the pieces of the multipart body?

编辑(3/25 上午 10 点):更多相关的 Stack Overflow 帖子:
WCF 服务接受后编码的 multipart/form-data
将 multipart/form-data 发布到WCF REST 服务:动作变化

EDIT (3/25 10 am): some more Stack Overflow posts that are related:
WCF service to accept a post encoded multipart/form-data
POSTing multipart/form-data to a WCF REST service: the action changes

EDIT(3/25 10:45 am):找到一个运行良好的多部分解析器:
http://antscode.blogspot.com/2009/11/parsing-multipart-form-data-in-wcf.html

EDIT (3/25 10:45 am): Found a multipart parser that works very well:
http://antscode.blogspot.com/2009/11/parsing-multipart-form-data-in-wcf.html

提前致谢.

推荐答案

感谢 Anthony 在 http://antscode.blogspot.com/ 适用于效果很好的多部分解析器(用于图像、txt 文件等).

Thanks to Anthony over at http://antscode.blogspot.com/ for the multipart parser that works great (for images, txt files, etc).

http://antscode.blogspot.com/2009/11/parsing-multipart-form-data-in-wcf.html

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