WP7 resumable upload

Resumable data transfer is actually a request stream in the middle of the Request stream, instead of coming from the beginning each time.

Httpwebrequest myrq = (httpwebrequest) httpwebrequest. createhttp (URL );

Myrq. headers ["range"] = "bytes = 1024-"; // sets the range value.

This is the stream from the beginning to the end of the request.

If myrq. headers ["range"] = "bytes = 1024-2048 ";

Indicates the data at the 1024 to 2048 locations in the request.

With this method, writing resumable upload is much simpler. The error is omitted as follows:

 

 
Public VoidDownfile (StringURL,StringFilename, progressbar prog)
 

 
{
 

 
// Open the last downloaded file or create a new file
 

 
LongLstartpos = 0;
 

 
Isolatedstoragefilestream FS;
 

If(Isolatedstoragefile. getuserstoreforapplication (). fileexists (filename ))
 

 
{
 

 
FS = isolatedstoragefile. getuserstoreforapplication (). openfile (filename, filemode. Open );
 

 
Lstartpos = FS. length;
 

 
FS. Seek (lstartpos, system. Io. seekorigin. Current );// Move the current pointer in the file stream
 

 
}
 

 
Else 
 

 
{
 

 
FS = isolatedstoragefile. getuserstoreforapplication (). createfile (filename );
 

 
Lstartpos = 0;
 

 
}
 

Try 
 

 
{
 

 
Httpwebrequest myrq = (httpwebrequest) httpwebrequest. createhttp (URL );
 

 
Myrq. headers ["User-Agent"] ="Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0;. Net CLR 1.0.3705 )";
 

 
If(Lstartpos> 0)
 

 
{
 

 
Myrq. headers ["Range"] ="Bytes ="+ Lstartpos +"-";// Set the range value
 

 
}
 

 
Myrq. begingetresponse (NewAsynccallback (a) =>
 

{
 

 
VaR myrp = myrq. endgetresponse ();
 

 
LongTotalbytes = myrp. contentlength + FS. length;
 

 
This. Dispatcher. begininvoke () => {Prog. Maximum = (Int) Totalbytes ;});
 

 
Stream ST = myrp. getresponsestream ();
 

 
// Stream so = new filestream (filename, filemode. Create );
 

 
LongTotaldownloadedbyte = FS. length;
 

 
Byte[] By =New Byte[1024];
 

IntOsize = ST. Read (by, 0 ,(Int) By. Length );
 

 
While(Osize> 0)
 

 
{
 

 
Totaldownloadedbyte = osize + totaldownloadedbyte;
 

 
FS. Write (by, 0, osize );
 

 
This. Dispatcher. begininvoke () => {Prog. value = (Int) Totaldownloadedbyte ;});
 

 
Osize = ST. Read (by, 0 ,(Int) By. Length );
 

 
}
 

 
FS. Close ();
 

St. Close ();
 

 
MessageBox. Show ("Download complete! ");
 

 
}),Null);
 

 
}
 

 
Catch(Exception ex)
 

 
{
 

 
MessageBox. Show ("Prompt"+ Ex. Message );
 

 
}
 

 
}
 

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