void PushDownFile(List <DownResInfo> downList, string url)
{
DownResInfo node = new DownResInfo();
node.url = url;
CHttpDown.GetDownFileSize(url, out node.nFileSize);
downList.Add(node);
}
void DownFile(CHttp http, string url, int nFileSize, int nLastDownSize)
{
// 如果文件比较小的话，可以不分片下载，真正下载整个文件
if (nFileSize == 0)
{
CHttpDown.GetDownFileSize(url, out nFileSize);
}
DownResFile resInfo = new DownResFile();
resInfo.url = url;
resInfo.nFileSize = 0;
if (0 == nFileSize)
{
// 无法获取文件大小信息,整个下载吧
bool bSuc = DownPart(http, url, 0, 0, nFileSize, resInfo);
NotifyDownEvent(url, bSuc, resInfo);
return;
}
int nPageSize = 1024 * 300; // 分片的大小，应小于你的最大限制下载速度, 这里默认选用300K，读者自己根据项目修改
int nFileOffset = nLastDownSize; // 从上一次下载的位置接着下载
int nDownSize = 0;
for (; nFileOffset < nFileSize; nFileOffset += nPageSize)
{
// 先限速
LimitSpeed();
// 开始分片下载
nDownSize = nFileOffset + nPageSize < nFileSize ? nPageSize : (nFileSize - nFileOffset);
if (!DownPart(http, url, nFileOffset, nDownSize, nFileSize, resInfo))
{
NotifyDownEvent(url, false, resInfo);
return;
}
}
NotifyDownEvent(url, true, resInfo);
}
