bool DownPart(CHttp http, string url, int nFileOffset, int nDownSize, int nFileSize, DownResFile resFile)
{
// 调用Http下载的代码
nDownSize = http.PrepareDown(url, nFileOffset, nDownSize, nDownSize == 0);
if (nDownSize <= 0)
{
Debug.LogError("文件下载失败，url:" + url + "(" + nFileOffset + "-" + nDownSize + ")");
return(false);
}
// 将下载的内容提交到写线程
byte[] szTempBuf = null;
int nCurDownSize = 0;
int nRecTotal = 0;
int nRecLen = 0;
int nOffset = 0;
nCurDownSize = nDownSize > 4096 ? 4096 : nDownSize;
MemBlock pBlock = AllockBlock(url, nFileOffset, nCurDownSize, nFileSize); // 从内存池中取一个4K的内存片
while (nDownSize > 0 && !m_bNeedStop)
{
// 必要的话，在这里添加限速功能或限制接收速度的功能，以免网速太快，导致一秒内分配太多内存
//LimitSpeed();
nRecLen = http.FastReceiveMax(ref szTempBuf, ref nOffset, 4096 - nRecTotal);
if (nRecLen > 0)
{
OnReceive(nRecLen); // 统计下载的流量
Array.Copy(szTempBuf, nOffset, pBlock.data, nRecTotal, nRecLen);
nRecTotal += nRecLen;
// 如果当前块接收满了
if (nRecTotal >= nCurDownSize)
{
pBlock.resFile = resFile;
PushWrite(pBlock);// 提交写文件
nRecTotal = 0;
nDownSize -= nCurDownSize;
nFileOffset += nCurDownSize;
nCurDownSize = nDownSize > 4096 ? 4096 : nDownSize;
// 必要的话，加上限额等待
if (nCurDownSize > 0)
{
WaitBlock(1024 * 1024); // 检测当前内存池分配的总量，超过就挂起
pBlock = AllockBlock(url, nFileOffset, nCurDownSize, nFileSize); // 从内存池中取一个4K的内存片
}
}
}
else
{
return(false); // 文件读取失败，可能是网络出问题了
}
}
return(true);
}
// 功能：下载整个文件
// 说明：这个接口是阻塞模式的，请不要在主线程调用
static public bool DownFile(string url, out byte[] szFileData, int nDownOffset = 0, int nNeedDownSize = 0, long nRandSeed = 0, LPOnReceiveDownFile lpReceiveFunc = null)
{
szFileData = null;
CHttp http = new CHttp(nRandSeed);
string szServerIP = string.Empty, szObj = string.Empty;
int nPort = 80;
http.ParseURL(url, ref szServerIP, ref szObj, ref nPort);
string szAnswer = string.Empty;
if (!http.QueryFile(ref szAnswer, szServerIP, nPort, szObj, nDownOffset, nNeedDownSize, nNeedDownSize <= 0))
{
http.Close();
return(false);
}
int nDownSize = 0, nFileSize = 0;
if (!http.AnlyseFileLengthFromAnswer(szAnswer, ref nDownSize, ref nFileSize))
{
http.Close();
return(false);
}
nDownSize = nFileSize;
byte[] szTempBuf = null;
szFileData = new byte[nFileSize];
int nRecTotal = 0;
int nRecLen = 0;
int nOffset = 0;
while (nRecTotal < nDownSize)
{
nRecLen = http.FastReceiveMax(ref szTempBuf, ref nOffset);
// 写入文件吧
if (nRecLen > 0)
{
if (lpReceiveFunc != null)
{
lpReceiveFunc(nRecLen);
}
Array.Copy(szTempBuf, nOffset, szFileData, nRecTotal, nRecLen);
nRecTotal += nRecLen;
}
else
{
break;
}
}
http.Close();
return(nRecTotal == nDownSize);
}
// 功能：下载文件，并将下载的文件保存到本地
// 参数：url - 网络URL的地址
// szLocalPathName - 本地保存地址
// 说明：这个接口是阻塞模式的，请不要在主线程调用
static public bool DownFile(string url, string szLocalPathName, int nNeedDownOffset, int nNeedDownSize, long nRandSeed = 0, LPOnReceiveDownFile lpReceiveFunc = null)
{
CHttp http = new CHttp(nRandSeed);
string szServerIP = string.Empty, szObj = string.Empty;
int nPort = 80;
http.ParseURL(url, ref szServerIP, ref szObj, ref nPort);
string szAnswer = string.Empty;
if (!http.QueryFile(ref szAnswer, szServerIP, nPort, szObj, nNeedDownOffset, nNeedDownSize, nNeedDownSize <= 0))
{
http.Close();
return(false);
}
int nDownSize = 0, nFileSize = 0;
if (!http.AnlyseFileLengthFromAnswer(szAnswer, ref nDownSize, ref nFileSize))
{
http.Close();
return(false);
}
if (nNeedDownSize <= 0)
{
nDownSize = nFileSize; // 这是全部下载
}
// 打开本地文件
if (File.Exists(szLocalPathName))
{
File.Delete(szLocalPathName);
}
FileStream pFile = new FileStream(szLocalPathName, FileMode.CreateNew, FileAccess.Write);
// 开始下载吧
byte[] szTempBuf = null;
int nRecTotal = 0;
int nRecLen = 0;
int nOffset = 0;
while (nRecTotal < nDownSize)
{
nRecLen = http.FastReceiveMax(ref szTempBuf, ref nOffset);
// 写入文件吧
if (nRecLen > 0)
{
if (lpReceiveFunc != null)
{
lpReceiveFunc(nRecLen);
}
nRecTotal += nRecLen;
pFile.Write(szTempBuf, nOffset, nRecLen);
}
else
{
break;
}
}
http.Close();
pFile.Close();
return(nRecTotal == nDownSize);
}
