/// <summary>
/// 下载文件
/// </summary>
/// <param name="webRequest">WEB请求信息</param>
/// <param name="savePath">保存路径</param>
/// <param name="requestCookie">请求Cookie</param>
/// <param name="responseCookie">响应Cookie</param>
/// <param name="errMsg">[OUT]错误信息</param>
/// <returns>执行结果</returns>
public static bool CF_DownloadFile(ModWebRequest webRequest, string savePath, CookieContainer requestCookie, out CookieContainer responseCookie, out string errMsg)
{
errMsg = "";
bool result = false;
try
{
Stream stream = CF_GetWebStream(webRequest, requestCookie, out responseCookie, out errMsg);
if (string.IsNullOrEmpty(errMsg))
{
using (FileStream fileStream = new FileStream(savePath, FileMode.Create))
{
ModHttpTransSpeed transmissionSpeed = webRequest.DownloadSpeed;
if (transmissionSpeed.EnableLimit)
{
//缓存字节数
int bufferSize = transmissionSpeed.Speed * (int)Math.Pow(2, transmissionSpeed.Unit.CF_ToNumber());
//缓存
byte[] btBuffer = new byte[bufferSize];
//读取的字节数
int readSize = stream.Read(btBuffer, 0, bufferSize);
while (readSize > 0)
{
//写入服务器
fileStream.Write(btBuffer, 0, readSize);
readSize = stream.Read(btBuffer, 0, bufferSize);
//延时
if (readSize > 0)
{
Thread.Sleep(transmissionSpeed.Delay);
}
}
}
else
{
stream.CopyTo(fileStream);
}
}
result = true;
}
}
catch (Exception ex)
{
responseCookie = null;
errMsg = string.IsNullOrEmpty(errMsg) ? ex.Message : errMsg;
}
return(result);
}
/// <summary>
/// 获取HTML代码
/// </summary>
/// <param name="webRequest">WEB请求信息</param>
/// <param name="requestCookie">请求Cookie</param>
/// <param name="responseCookie">响应Cookie</param>
/// <param name="errMsg">[OUT]错误信息</param>
/// <returns>HTML代码</returns>
public static string CF_GetHtmlCode(ModWebRequest webRequest, CookieContainer requestCookie, out CookieContainer responseCookie, out string errMsg)
{
errMsg = "";
string result = string.Empty;
try
{
Stream stream = CF_GetWebStream(webRequest, requestCookie, out responseCookie, out errMsg);
if (string.IsNullOrEmpty(errMsg))
{
//判断是否限速
ModHttpTransSpeed transmissionSpeed = webRequest.DownloadSpeed;
if (transmissionSpeed.EnableLimit)
{
//数据列表
List <byte> lstBytes = new List <byte>();
//缓存字节数
int bufferSize = transmissionSpeed.Speed * (int)Math.Pow(2, transmissionSpeed.Unit.CF_ToNumber());
//缓存
byte[] btBuffer = new byte[bufferSize];
//读取的字节数
int readSize = stream.Read(btBuffer, 0, bufferSize);
while (readSize > 0)
{
//从服务器读取
stream.Read(btBuffer, 0, readSize);
//记入列表
lstBytes.AddRange(btBuffer);
readSize = stream.Read(btBuffer, 0, bufferSize);
//延时
if (readSize > 0)
{
Thread.Sleep(transmissionSpeed.Delay);
}
}
//转化为字符串
result = webRequest.Encoding.GetString(lstBytes.ToArray());
}
else
{
using (StreamReader streamReader = new StreamReader(stream, webRequest.Encoding))
{
result = streamReader.ReadToEnd();
}
}
}
stream.Close();
}
catch (Exception ex)
{
responseCookie = null;
errMsg = string.IsNullOrEmpty(errMsg) ? ex.Message : errMsg;
}
return(result);
}
/// <summary>
/// 获取数据流
/// </summary>
/// <param name="webRequest">WEB请求信息</param>
/// <param name="requestCookie">请求Cookie</param>
/// <param name="responseCookie">响应Cookie</param>
/// <param name="errMsg">[OUT]错误信息</param>
/// <returns>数据流</returns>
public static Stream CF_GetWebStream(ModWebRequest webRequest, CookieContainer requestCookie, out CookieContainer responseCookie, out string errMsg)
{
errMsg = "";
Stream result = null;
try
{
//检查输入URL
if (!(WebRequest.Create(webRequest.RequestUrl) is HttpWebRequest httpWebRequest))
{
responseCookie = null;
errMsg = "URL不规范！";
}
else
{
//初始化请求模型
httpWebRequest.KeepAlive = webRequest.KeepAlive;
httpWebRequest.AllowAutoRedirect = webRequest.AllowAutoRedirect;
if (webRequest.Proxy.Enable)
{
httpWebRequest.Proxy = new WebProxy(webRequest.Proxy.Host, webRequest.Proxy.Port);
}
httpWebRequest.Timeout = webRequest.TimeOut;
httpWebRequest.Method = webRequest.Method.ToString();
httpWebRequest.ProtocolVersion = webRequest.ProtocolVersion;
if (!string.IsNullOrEmpty(webRequest.Host))
{
httpWebRequest.Host = webRequest.Host;
}
if (!string.IsNullOrEmpty(webRequest.Accept))
{
httpWebRequest.Accept = webRequest.Accept;
}
if (!string.IsNullOrEmpty(webRequest.Referer))
{
httpWebRequest.Referer = webRequest.Referer;
}
if (!string.IsNullOrEmpty(webRequest.UserAgent))
{
httpWebRequest.UserAgent = webRequest.UserAgent;
}
if (!string.IsNullOrEmpty(webRequest.ContentType))
{
httpWebRequest.ContentType = webRequest.ContentType;
}
if (!string.IsNullOrEmpty(webRequest.ContentType))
{
httpWebRequest.ContentType = webRequest.ContentType;
}
foreach (string key in webRequest.Headers.Keys)
{
httpWebRequest.Headers[key] = webRequest.Headers[key];
}
if (!string.IsNullOrEmpty(webRequest.Cookie))
{
httpWebRequest.Headers["Cookie"] = webRequest.Cookie;
}
httpWebRequest.CookieContainer = requestCookie;
//判断请求方式
if (webRequest.Method == ERequestMethod.POST)
{
byte[] postData;
//优先处理 PostBytes
if (webRequest.PostBytes == null)
{
StringBuilder postString = new StringBuilder();
//再处理 PostString
if (string.IsNullOrEmpty(webRequest.PostString))
{
foreach (string key in webRequest.PostDictionary.Keys)
{
if (!string.IsNullOrEmpty(key))
{
postString.Append($"{key}={ webRequest.PostDictionary[key]}&");
}
}
}
else
{
postString.Append(webRequest.PostString);
}
postData = Encoding.UTF8.GetBytes(postString.ToString().TrimEnd('&'));
}
else
{
postData = webRequest.PostBytes;
}
httpWebRequest.ContentLength = postData.Length;
using (Stream requestStream = httpWebRequest.GetRequestStream())
{
ModHttpTransSpeed transmissionSpeed = webRequest.UploadSpeed;
if (transmissionSpeed.EnableLimit)
{
//单次发送字节数
int bufferSize = transmissionSpeed.Speed * (int)Math.Pow(2, transmissionSpeed.Unit.CF_ToNumber());
//发送数据字节数小于限速单次发送字节数
if (postData.Length <= bufferSize)
{
requestStream.Write(postData, 0, postData.Length);
}
else
{
//计算传输次数
int count = postData.Length / bufferSize;
//发送数据
for (int i = 0; i < count; i++)
{
requestStream.Write(postData, i * bufferSize, bufferSize);
//延时（非最后一次）
if (i != count - 1)
{
Thread.Sleep(transmissionSpeed.Delay);
}
}
//补偿剩余字节
if (bufferSize * count != postData.Length)
{
Thread.Sleep(transmissionSpeed.Delay);
requestStream.Write(postData, bufferSize * count, postData.Length - bufferSize * count);
}
}
}
else
{
requestStream.Write(postData, 0, postData.Length);
}
requestStream.Close();
}
}
//获取远程响应
HttpWebResponse httpWebResponse = (HttpWebResponse)httpWebRequest.GetResponse();
if (httpWebResponse.StatusCode == HttpStatusCode.OK)
{
responseCookie = httpWebRequest.CookieContainer;
result = httpWebResponse.GetResponseStream();
errMsg = "";
}
else
{
responseCookie = null;
result = null;
errMsg = $"[{(int)httpWebResponse.StatusCode}:{httpWebResponse.StatusCode}]数据流请求错误！";
}
}
}
