Esempio n. 1
0
        const int DefaultTimeout = 60 * 1000; // 1 minutes timeout

        #endregion Fields

        #region Methods

        //异步方式发起http get请求
        public bool HttpGet(string url, string queryString, AsyncHttpCallback callback)
        {
            if (!string.IsNullOrEmpty(queryString))
            {
                url += "?" + queryString;
            }

            HttpWebRequest webRequest = WebRequest.Create(url) as HttpWebRequest;
            webRequest.Method = "GET";
            webRequest.ServicePoint.Expect100Continue = false;

            try
            {
                RequestState state = new RequestState();
                state.cb = callback;
                state.request = webRequest;

                IAsyncResult result = (IAsyncResult)webRequest.BeginGetResponse(new AsyncCallback(ResponseCallback), state);

                // this line implements the timeout, if there is a timeout, the callback fires and the request becomes aborted
                ThreadPool.RegisterWaitForSingleObject(result.AsyncWaitHandle, new WaitOrTimerCallback(TimeoutCallback), webRequest, DefaultTimeout, true);

                // The response came in the allowed time. The work processing will happen in the callback function.
                allDone.WaitOne();

                // Release the HttpWebResponse resource.
                state.response.Close();
            }
            catch
            {
                return false;
            }

            return true;
        }
Esempio n. 2
0
        //异步方式发起http post请求
        public bool HttpPost(string url, string queryString, AsyncHttpCallback callback)
        {
            StreamWriter requestWriter = null;
            // StreamReader responseReader = null;

            // string responseData = null;

            HttpWebRequest webRequest = WebRequest.Create(url) as HttpWebRequest;
            webRequest.Method = "POST";
            webRequest.ContentType = "application/x-www-form-urlencoded";
            webRequest.ServicePoint.Expect100Continue = false;

            try
            {
                //POST the data.
                requestWriter = new StreamWriter(webRequest.GetRequestStream());
                requestWriter.Write(queryString);
                requestWriter.Close();
                requestWriter = null;

                RequestState state = new RequestState();
                state.cb = callback;
                state.request = webRequest;

                IAsyncResult result = (IAsyncResult)webRequest.BeginGetResponse(new AsyncCallback(ResponseCallback), state);

                // this line implements the timeout, if there is a timeout, the callback fires and the request becomes aborted
                ThreadPool.RegisterWaitForSingleObject(result.AsyncWaitHandle, new WaitOrTimerCallback(TimeoutCallback), webRequest, DefaultTimeout, true);

                // The response came in the allowed time. The work processing will happen in the
                // callback function.
                allDone.WaitOne();

                // Release the HttpWebResponse resource.
                state.response.Close();
            }
            catch
            {
                return false;
            }
            finally
            {
                if (requestWriter != null)
                {
                    requestWriter.Close();
                    requestWriter = null;
                }
            }

            return true;
        }
Esempio n. 3
0
 private void FireCallback(RequestState state)
 {
     //call back
     if (state.cb != null)
     {
         state.cb(this, state.requestData.ToString());
     }
 }
Esempio n. 4
0
        //异步方式发起http post请求,可以同时上传文件
        public bool HttpPostWithFile(string url, string queryString, List<APIParameter> files, AsyncHttpCallback callback)
        {
            Stream requestStream = null;
            string boundary = DateTime.Now.Ticks.ToString("x");

            url += '?' + queryString;
            HttpWebRequest webRequest = WebRequest.Create(url) as HttpWebRequest;
            webRequest.ServicePoint.Expect100Continue = true;
            webRequest.ContentType = "multipart/form-data; boundary=" + boundary;
            webRequest.Method = "POST";
            webRequest.KeepAlive = true;
            webRequest.Credentials = CredentialCache.DefaultCredentials;

            try
            {
                Stream memStream = new MemoryStream();

                byte[] boundarybytes = System.Text.Encoding.ASCII.GetBytes("\r\n--" + boundary + "\r\n");
                string formdataTemplate = "\r\n--" + boundary + "\r\nContent-Disposition: form-data; name=\"{0}\"\r\n\r\n{1}";

                List<APIParameter> listParams = HttpUtil.GetQueryParameters(queryString);

                foreach (APIParameter param in listParams)
                {
                    //需要将
                    string formitem = string.Format(formdataTemplate, param.Name, (FormParamDecode(param.Value)));
                    byte[] formitembytes = Encoding.UTF8.GetBytes(formitem);
                    memStream.Write(formitembytes, 0, formitembytes.Length);
                }

                memStream.Write(boundarybytes, 0, boundarybytes.Length);

                string headerTemplate = "Content-Disposition: form-data; name=\"{0}\"; filename=\"{1}\"\r\nContent-Type: \"{2}\"\r\n\r\n";

                foreach (APIParameter param in files)
                {
                    string name = param.Name;
                    string filePath = param.Value;
                    string file = Path.GetFileName(filePath);
                    string contentType = HttpUtil.GetContentType(file);

                    string header = string.Format(headerTemplate, name, file, contentType);
                    byte[] headerbytes = System.Text.Encoding.UTF8.GetBytes(header);

                    memStream.Write(headerbytes, 0, headerbytes.Length);

                    FileStream fileStream = new FileStream(filePath, FileMode.Open, FileAccess.Read);
                    byte[] buffer = new byte[1024];
                    int bytesRead = 0;

                    while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) != 0)
                    {
                        memStream.Write(buffer, 0, bytesRead);
                    }

                    memStream.Write(boundarybytes, 0, boundarybytes.Length);
                    fileStream.Close();
                }

                webRequest.ContentLength = memStream.Length;

                requestStream = webRequest.GetRequestStream();

                memStream.Position = 0;
                byte[] tempBuffer = new byte[memStream.Length];
                memStream.Read(tempBuffer, 0, tempBuffer.Length);
                memStream.Close();
                requestStream.Write(tempBuffer, 0, tempBuffer.Length);
                requestStream.Close();
                requestStream = null;

                RequestState state = new RequestState();
                state.cb = callback;
                state.request = webRequest;

                IAsyncResult result = (IAsyncResult)webRequest.BeginGetResponse(new AsyncCallback(ResponseCallback), state);
                ThreadPool.RegisterWaitForSingleObject(result.AsyncWaitHandle, new WaitOrTimerCallback(TimeoutCallback),
                    webRequest, DefaultTimeout, true);
                allDone.WaitOne();

                state.response.Close();
            }
            catch
            {
                return false;
            }
            finally
            {
                if (requestStream != null)
                {
                    requestStream.Close();
                    requestStream = null;
                }
            }

            return true;
        }