public void ReleaseRessources()
{
if (this.FStream != null)
{
this.FStream.Close();
try
{
FStream.Dispose();
}
catch (Exception ex)
{
string message = ex.Message;
}
}
}
public static bool Download(string sourceFile, string desFile)
{
bool flag = false;
long SPosition = 0;
FileStream FStream = null;
Stream myStream = null;
string fileName = sourceFile.Substring(sourceFile.LastIndexOf(@"/") + 1);
if (desFile.EndsWith("\\"))
{
desFile = desFile + fileName;
}
else
{
desFile = desFile + "\\" + fileName;
}
try
{
long serverFileLength = 0;
//判断要下载的文件夹是否存在
if (File.Exists(desFile))
{
//打开上次下载的文件
FStream = File.OpenWrite(desFile);
//获取已经下载的长度
SPosition = FStream.Length;
serverFileLength = GetHttpLength(sourceFile);
if (SPosition == serverFileLength)
{//文件是完整的，直接结束下载任务
return(true);
}
FStream.Seek(SPosition, SeekOrigin.Current);
}
else
{
//文件不保存创建一个文件
FStream = new FileStream(desFile, FileMode.Create);
SPosition = 0;
}
//打开网络连接
HttpWebRequest myRequest = (HttpWebRequest)HttpWebRequest.Create(sourceFile);
if (SPosition > 0)
{
myRequest.AddRange(SPosition); //设置Range值
}
//向服务器请求,获得服务器的回应数据流
myStream = myRequest.GetResponse().GetResponseStream();
//定义一个字节数据
byte[] btContent = new byte[512];
int intSize = 0;
intSize = myStream.Read(btContent, 0, 512);
while (intSize > 0)
{
FStream.Write(btContent, 0, intSize);
intSize = myStream.Read(btContent, 0, 512);
}
flag = true; //返回true下载成功
}
catch (Exception ex)
{
System.Console.WriteLine("下载文件时异常：" + ex.Message + ex.StackTrace);
}
finally
{
//关闭流
if (myStream != null)
{
myStream.Close();
myStream.Dispose();
}
if (FStream != null)
{
FStream.Close();
FStream.Dispose();
}
}
return(flag);
}
public bool Start()
{
if (SavePath == "" || Url == "")
{
return(false);
}
if (!SavePath.EndsWith("\\"))
{
SavePath += "\\";
}
bool flag = false;
long SPosition;
FileStream FStream = null;
Stream myStream = null;
String desFile = SavePath + SaveFile + Suffix;
try
{
//判断要下载的文件夹是否存在
if (File.Exists(desFile))
{
//打开上次下载的文件
FStream = File.OpenWrite(desFile);
//获取已经下载的长度
SPosition = FStream.Length;
long serverFileLength = GetHttpLength(Url);
if (SPosition == serverFileLength)
{//文件是完整的，直接结束下载任务
return(true);
}
FStream.Seek(SPosition, SeekOrigin.Current);
}
else
{
//文件不保存创建一个文件
FStream = new FileStream(desFile, FileMode.Create);
SPosition = 0;
}
//打开网络连接
HttpWebRequest myRequest = (HttpWebRequest)HttpWebRequest.Create(Url);
if (SPosition > 0)
{
myRequest.AddRange(SPosition); //设置Range值
}
//向服务器请求,获得服务器的回应数据流
myStream = myRequest.GetResponse().GetResponseStream();
//定义一个字节数据
byte[] btContent = new byte[512];
int intSize = 0;
intSize = myStream.Read(btContent, 0, 512);
while (intSize > 0)
{
FStream.Write(btContent, 0, intSize);
intSize = myStream.Read(btContent, 0, 512);
}
flag = true; //返回true下载成功
}
catch (Exception ex)
{
//下载文件时异常
}
finally
{
//关闭流
if (myStream != null)
{
myStream.Close();
myStream.Dispose();
}
if (FStream != null)
{
FStream.Close();
FStream.Dispose();
}
}
if (flag)
{
File.Move(desFile, SavePath + SaveFile);
}
return(flag);
}