HttpWebRequest pass parameters to WebService

Question

I have a webpage that need to pass data to web Service (SMS) and I tried to use WebRequest to do this work but when I use this class the following error appears:

Cannot close stream until all bytes are written

in the line after this line :

stOut.WriteLine(strNewValue,number,text);

What is the problem? I tried to use Flush() but didn't work either

public class SendSms
{
    public SendSms(string number, string text)
    {
         string strNewValue;
         string strResponse;

         HttpWebRequest req = (HttpWebRequest)WebRequest.Create("http://www.buymessage.com/ostazSms/send.php");          

         req.Method = "POST";
         req.ContentType = "application/x-www-form-urlencoded";
         strNewValue = "usr=****&pwd=*****&to={0}&msg={1}"; 
         req.ContentLength = strNewValue.Length;

         using(StreamWriter stOut = new StreamWriter (req.GetRequestStream(), System.Text.Encoding.Unicode))
         {
             stOut.WriteLine(strNewValue,number,text);
         }

        StreamReader stIn = new StreamReader(req.GetResponse().GetResponseStream());
        strResponse = stIn.ReadToEnd();
        stIn.Close();  
    }
}

is it a .net/WDSL webservice? It woudl probably be easier to create a Web reference or service reference and let it handle the http interaction. as for your approach, have you tried flushing the stream after the write? — Frank Thomas
– Frank Thomas, Commented Nov 2, 2012 at 23:32

Fenton · Accepted Answer · 2012-11-02 23:44:44Z

1

Your issue is that you call WriteLine, which probably doesn't send all the data.

Here is a snippet that encodes the post data and sends it all:

string strNewValue = string.Format("usr=****&pwd=*****&to={0}&msg={1}", "A", "B");
byte[] byteArray = Encoding.UTF8.GetBytes (strNewValue);
req.ContentLength = byteArray.Length;

using (Stream dataStream = req.GetRequestStream ()) {
    dataStream.Write (byteArray, 0, byteArray.Length);
}

edited Nov 2, 2012 at 23:44

answered Nov 2, 2012 at 23:34

Fenton

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8 Comments

Hassan Juniedi Over a year ago

but how i will add parameters into strNewValues ?

Hassan Juniedi Over a year ago

can i use string.format on strNewValues and add values then use the string in byteArray[]

Fenton Over a year ago

Perform the string format first so you have your final string before you convert it into a byteArray.

Hassan Juniedi Over a year ago

thakyou so much no error is appear but the data is didnot pass to webservice .... can you help me in this :(

Fenton Over a year ago

What information did you get back in the response? I would expect an HTTP response code that will help identify the issue.

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