how can I hit the URL from windows application ?.

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i am working on windows application which converts the file into bytes and post this converted bytes to the url where i want to access these converted bytes and after accessing i want to convert it back to its origional form.....
here is the code of windows form .

C#

byte[] bytes = System.IO.File.ReadAllBytes("E:\\Asim Pics\\At Home\\DSC_0000084.jpg");

           //System.IO.File.WriteAllBytes("E:\\asim.jpg", bytes);
           string url = "http://localhost:55937/binary-conversion/frm-conversion.aspx? q=" + bytes + "";
           //for hitting a specific url i am using this line
           System.Diagnostics.Process.Start(url);

and in aspx page i m using this code to access that file which i posted from windows form ....

C#

<pre lang="cs">string file =  Request.QueryString["q"];

       byte[] asdf = Convert.ToByte(file);

       System.IO.File.WriteAllBytes(@"E:\usman.jpg", asdf);

but i m getting an error when i try to convert this file to the bytes.... is this poosible that we transfer a file through url hitting and then access it from aspx pages and work on it ?????

Posted 12-Sep-13 0:54am

Asim8748

Updated 12-Sep-13 0:56am

v3

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thatraja 12-Sep-13 7:05am

what's the error? always mention the error message to get quick response atleast normal response

Asim8748 12-Sep-13 7:17am

error is that "cannot implicity convert string to bytes".

Asim8748 12-Sep-13 7:17am

here is the error line
byte[] asdf = Convert.ToByte(file);

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Marc Gabrie · Answer 1 · 2013-09-12T01:29:00

Solution 1

You have to convert those bytes into a base64 string like follows:

C#

string url = "http://localhost:55937/binary-conversion/frm-conversion.aspx?q=" + Convert.ToBase64String(bytes);

then in your asp.net code you have to do this:

C#

byte[] asdf = Convert.FromBase64String(file);

Posted 12-Sep-13 1:29am

Marc Gabrie

Comments

Asim8748 12-Sep-13 7:42am

when i m trying this code it gives me the following error ..

Exception Details: System.ArgumentNullException: Value cannot be null.
Parameter name: InString
and this error appears on aspx page .

Marc Gabrie 12-Sep-13 13:31pm

validate that the variable "file" is not being null. Are you sure you used the same query string I posted here? Seeing your code it seems you have some space between "...? q=" which should not be there. Put a breakpoint in your aspx code and see what is going on...

Asim8748 13-Sep-13 6:36am

there is no space between them. the "file" variable receive some bytes from URL query string but it discard the remaining bytes which I post from windows application. I think there is a issue in array size. after some time array get full and remaining data is discarded.

Marc Gabrie 13-Sep-13 8:10am

keep in mind that query string length has a limit!!! each browser has different limits (just google about this topic to get those values) Maybe you should go for doing a HTTP POST like stating here http://stackoverflow.com/questions/566462/upload-files-with-httpwebrequest-multipart-form-data

Asim8748 13-Sep-13 8:15am

I am also searched that from Google . but I didn't get any positive answer which can resolve my problem.