I have an API in NETMF C# that I am writing that includes a function to send an
HTTP request. For those who are familiar with NETMF, this is a heavily modified version of the "webClient" example, which a simple application that demonstrates how to submit an
HTTP request, and recive a response. In the sample, it simply prints the response and returns void,. In my version, however, I need it to return the
HTTP response.
For some reason, Visual Studio reports that not all code paths return a value, even though, as far as I can tell, they do.
Here is my code...
/// <summary>
/// This is a modified webClient
/// </summary>
/// <param name="url"></param>
private string httpRequest(string url)
{
// Create an
HTTP Web request.
HttpWebRequest request = HttpWebRequest.Create(url) as HttpWebRequest;
// Set request.KeepAlive to use a persistent connection.
request.KeepAlive = true;
// Get a response from the server.
WebResponse resp = request.GetResponse();
// Get the network response stream to read the page data.
if (resp != null)
{
Stream respStream = resp.GetResponseStream();
string page = "";
byte[] byteData = new byte[4096];
char[] charData = new char[4096];
int bytesRead = 0;
Decoder UTF8decoder = System.Text.Encoding.UTF8.GetDecoder();
int totalBytes = 0;
// allow 5 seconds for reading the stream
respStream.ReadTimeout = 5000;
// If we know the content length, read exactly that amount of
// data; otherwise, read until there is nothing left to read.
if (resp.ContentLength != -1)
{
for (int dataRem = (int)resp.ContentLength; dataRem > 0; )
{
Thread.Sleep(500);
bytesRead = respStream.Read(byteData,
0, byteData.Length);
if (bytesRead == 0)
throw new Exception("Data laes than expected");
dataRem -= bytesRead;
// Convert from bytes to chars, and add to the page
// string.
int byteUsed, charUsed;
bool completed = false;
totalBytes += bytesRead;
UTF8decoder.Convert(byteData,
0, bytesRead, charData,
0,
bytesRead, true, out byteUsed, out charUsed,
out completed);
page = page + new String(charData,
0, charUsed);
}
page = new String(System.Text.Encoding.UTF8.GetChars(byteData));
}
else
throw new Exception("No content-Length reported");
// Close the response stream. For Keep-Alive streams, the
// stream will remain open and will be pushed into the unused
// stream list.
resp.Close();
return page;
}
}
Any ideas? Thanks...
