How to use HttpWebRequest and get response back?

[Kueishiong Tu]

I have a url, I pass it to Webclient, and I get response without any problem.

String* uriString = S"trade7.master link.com.tw/futures/QuotePrice.jsp" ;
String* postData = S"";
// Create a new WebClient instance.
WebClient* myWebClient = new WebClient();
// Apply ASCII Encoding to obtain the String* as a Byte array.
Byte postArray[]= Encoding::ASCII->GetBytes(postD ata);

myWebClient->Headers->Add(S"Conten t-Type",

S"applicatio n/x-www-form-urlencoded");

//UploadData implicitly sets HTTP POST as the request method.
Byte responseArray[] = myWebClient->UploadData(uri String, postArray);
Now I pass the same string to HttpWebRequest. However, I do not get any
response
and get time-out exception. What is wrong with my HttpWebRequest call?

String* uriString = S"trade7.master link.com.tw/futures/QuotePrice.jsp" ;
HttpWebRequest *request = dynamic_cast<Ht tpWebRequest*>

(WebRequest::Cr eate(uriString) );
request->Method = "POST";
request->Credentials = CredentialCache ::DefaultCreden tials;
request->ContentType = S"applicatio n/x-www-form-urlencoded";

HttpWebResponse * response = dynamic_cast<Ht tpWebResponse*>
(request->GetResponse()) ;
// Gets the stream associated with the response.
Stream* receiveStream = response->GetResponseStr eam();
Encoding* encode = System::Text::E ncoding::GetEnc oding(S"utf-8");

// Pipes the stream to a higher level stream reader with the required
encoding format.
StreamReader* readStream = new StreamReader(re ceiveStream, encode);

String* responseText = readStream->ReadToEnd();
response->Close();

[Joerg Jooss]

Kueishiong Tu wrote:

I have a url, I pass it to Webclient, and I get response without any
problem.

String* uriString =
S"trade7.master link.com.tw/futures/QuotePrice.jsp" ; String*
postData = S""; // Create a new WebClient instance.
WebClient* myWebClient = new WebClient();
// Apply ASCII Encoding to obtain the String* as a Byte array.
Byte postArray[]= Encoding::ASCII->GetBytes(postD ata);

myWebClient->Headers->Add(S"Conten t-Type",

S"applicatio n/x-www-form-urlencoded");

//UploadData implicitly sets HTTP POST as the request method.
Byte responseArray[] = myWebClient->UploadData(uri String,
postArray);
Now I pass the same string to HttpWebRequest. However, I do not get
any response
and get time-out exception. What is wrong with my HttpWebRequest
call?

String* uriString =
S"trade7.master link.com.tw/futures/QuotePrice.jsp" ; HttpWebRequest
*request = dynamic_cast<Ht tpWebRequest*>

(WebRequest::Cr eate(uriString) );
request->Method = "POST";
request->Credentials = CredentialCache ::DefaultCreden tials;
request->ContentType = S"applicatio n/x-www-form-urlencoded";

HttpWebResponse * response = dynamic_cast<Ht tpWebResponse*>

(request->GetResponse()) ; // Gets the stream associated with the
response. Stream* receiveStream = response->GetResponseStr eam();
Encoding* encode = System::Text::E ncoding::GetEnc oding(S"utf-8");

// Pipes the stream to a higher level stream reader with the
required encoding format.
StreamReader* readStream = new StreamReader(re ceiveStream, encode);

String* responseText = readStream->ReadToEnd();
response->Close();

You're not posting anything. You're HttpWebRequest based code does not
emulate the line
myWebClient->UploadData(uri String, postArray);

You need to write your post data to the request stream before getting the
response:

// C# ;->
byte[] bytes = Encoding.UTF8.G etBytes(data);
HttpWebRequest request = (HttpWebRequest ) WebRequest.Crea te(url);
request.Method = "POST";
request.Content Length = bytes.Length;
request.Content Type = "applicatio n/x-www-form-urlencoded";
using (Stream requestStream = request.GetRequ estStream()) {
requestStream.W rite(bytes, 0, bytes.Length);
}

HttpWebResponse response = (HttpWebRespons e) request.GetResp onse();

Cheers,

--
Joerg Jooss
jo*********@gmx .net

[Kueishiong Tu]

You are absolutely right. Thank you very much for the help.

Kueishiong Tu