#include <afx.h>
#include <afxinet.h>
#define RECVPACK_SIZE 2048
bool DownloadSaveFiles(char* url,char *strSaveFile) {//下载文件并保存为新文件名bool ret=false;CInternetSession Sess("lpload");Sess.SetOption(INTERNET_OPTION_CONNECT_TIMEOUT     , 2000); //2秒的连接超时Sess.SetOption(INTERNET_OPTION_SEND_TIMEOUT        , 2000); //2秒的发送超时Sess.SetOption(INTERNET_OPTION_RECEIVE_TIMEOUT     , 2000); //2秒的接收超时Sess.SetOption(INTERNET_OPTION_DATA_SEND_TIMEOUT   , 2000); //2秒的发送超时Sess.SetOption(INTERNET_OPTION_DATA_RECEIVE_TIMEOUT, 2000); //2秒的接收超时DWORD dwFlag = INTERNET_FLAG_TRANSFER_BINARY|INTERNET_FLAG_DONT_CACHE|INTERNET_FLAG_RELOAD ;CHttpFile* cFile   = NULL;char      *pBuf    = NULL;int        nBufLen = 0   ;do {try{cFile = (CHttpFile*)Sess.OpenURL(url,1,dwFlag);DWORD dwStatusCode;cFile->QueryInfoStatusCode(dwStatusCode);if (dwStatusCode == HTTP_STATUS_OK) {//查询文件长度DWORD nLen=0;cFile->QueryInfo(HTTP_QUERY_CONTENT_LENGTH, nLen);//CString strFilename = GetFileName(url,TRUE);nBufLen=nLen;if (nLen <= 0) break;////分配接收数据缓存pBuf = (char*)malloc(nLen+8);ZeroMemory(pBuf,nLen+8);char *p=pBuf;while (nLen>0) {//每次下载8Kint n = cFile->Read(p,(nLen<RECVPACK_SIZE)?nLen:RECVPACK_SIZE);//接收完成退出循环if (n <= 0) break;////接收缓存后移p+= n ;//剩余长度递减nLen -= n ;}//如果未接收完中断退出if (nLen != 0) break;//接收成功保存到文件CFile file(strSaveFile, CFile::modeCreate | CFile::modeWrite);file.Write(pBuf,nBufLen);file.Close();ret = true;}} catch(...) {break;//}} while(0);//释放缓存if (pBuf) {free(pBuf);pBuf=NULL;nBufLen = 0 ;}//关闭下载连接if (cFile) {cFile->Close();Sess.Close();delete cFile;}return ret;
}
int main() {DownloadSaveFiles("http://www.nirsoft.net/utils/nircmd.zip","d:\\cppdld_nircmd.zip");return 0;
}