How to send big image from wp7 to wcf?

Question

I'm trying to send an image to wcf to use OCR. For now, I succeeded in transforming my image into a byte[] and sending it to the server using wcf. Unfortunately, it works for an array whose size is <16Kb and doesn't work for an array >17Kb.

I've already set the readerQuotas and maxArrayLength to its maximum size in web.config on the server size.

Do you know how to send big data to a wcf server, or maybe any library to use OCR directly on wp7?

Answer 1

如果所有其他方法都失败了，请以16Kb的片段发送，然后发送“全部完成”消息（必要时重新组装）

Answer 2

我不知道这是否适用于WP7，但是使用WCF，您还可以使用流来上传更大量的数据。

Answer 3

Bit of a hack but howabout sending it with a HTTP post if it isn't too big? or alternatively changing the webservice so it accepts a blob? (the current array limitation is a limit on the array datatype in the W3C spec)

Answer 4

Finaly solved. You have to update your web.config to allow the server to receive big data. And then you have to use the Stream type in your WCF and byte[] type in your WP7. Types will match and both WCF or WP7 will agree to receive and send it.

In WCF :

public string ConvertImgToStringPiece(Stream img)
{
     //.....
}

In WP7 :

Service1Client proxy = new Service1Client();    
proxy.ConvertImgToStringPieceCompleted += new EventHandler<ConvertImgToStringPieceCompletedEventArgs>(proxy_ConvertImgToStringPieceCompleted);    
proxy.ConvertImgToStringPieceAsync(b); //b is my Byte[], more thant 17Kb.

Answer 5

You can try using a WCF session. The key thing to remember is that sessions in WCF are different than normal sessions we use for Internet programming. It's basically a call to a method that starts the session, any interim calls, and then a final one that ends the session. You could have a service call that starts the session, send chunks of the image, and then call the last one which closes the session and will return whatever you need.

http://msdn.microsoft.com/en-us/library/ms733040.aspx