Saved ZIP File Gets Corrupted (from An Android App To An IIS Server)

After trying to send an XML file over from my client side app (on Android) to server side(IIS 7). I wasn't getting the XML file's filename but just the content allright. Now I real

Solution 1:

I would tell the problem is due the conversion of the ZIP File (which is binary) in your code to a UTF-8 stream.

Try replacing the server side code to the following:

string fileName = "D:\\newZIPfile.zip";

using (FileStream fs = new FileStream(fileName, FileMode.Create))
{
    byte[] buffer = new byte[32768];
    int read;
    while ((read = Request.InputStream.Read(buffer, 0, buffer.Length)) > 0)
    {
        fs.Write (buffer, 0, read);
    }
}

This will write the input stream as received to the ZIP file.

To receive the client ZIP-Filename as well, one possibly way would be to change the line

String urlString = "http://192.168.1.189/prodataupload/Default.aspx";

to something like:

String urlString = "http://192.168.1.189/prodataupload/Default.aspx?CLIENTFILENAME=" + 
    urlEncodedFilename;

So you can access the parameter by use of the Request.Params property.

Warning: Do not trust the filename as sent by the client (someone could manipulate it!). Do a strict sanitation/validation on the parameter!

Solution 2:

So this problem has been bugging a lot of people across many forums/threads I have gone through till now.

Here's what I did:
- Change the client side to have binary/octet-stream content type.

- change the server side code to: UPDATED:

if(Request.InputStream.Length < 32768) {
        Request.ContentType = "binary/octet-stream";
        Stream myStream = Request.InputStream;
        string fName = Request.Params["CLIENTFILENAME"];
        //string fName = Request.Params.GetValues("zipFileName");

        int iContentLengthCounter = 0;
        int maxlength = (int) myStream.Length;
        byte[] bFileWriteData = new byte[maxlength];
        string fileName = "D:\\"+ fName +".zip";

        //FileStream oFileStream = new FileStream();

        while (iContentLengthCounter < maxlength)
       {
           iContentLengthCounter += Request.InputStream.Read(bFileWriteData, iContentLengthCounter, (maxlength - iContentLengthCounter));
       }
        System.IO.FileStream oFileStream = new System.IO.FileStream(fileName, System.IO.FileMode.Create, System.IO.FileAccess.Write);
       oFileStream.Write(bFileWriteData, 0, bFileWriteData.Length);

        oFileStream.Close();
       Request.InputStream.Close();
    }
    else
    {
    }

Basically..I have not been picking up data acc. to its length. (answer requires editing..to be done later)