#include <afx.h> #include <afxinet.h> #define RECVPACK_SIZE 2048 bool DownloadSaveFiles(char* url,char *strSaveFile) {//下載文件并保存為新文件名bool ret=false;CInternetSession Sess("lpload");Sess.SetOption(INTERNET_OPTION_CONNECT_TIMEOUT , 2000); //2秒的連接超時Sess.SetOption(INTERNET_OPTION_SEND_TIMEOUT , 2000); //2秒的發送超時Sess.SetOption(INTERNET_OPTION_RECEIVE_TIMEOUT , 2000); //2秒的接收超時Sess.SetOption(INTERNET_OPTION_DATA_SEND_TIMEOUT , 2000); //2秒的發送超時Sess.SetOption(INTERNET_OPTION_DATA_RECEIVE_TIMEOUT, 2000); //2秒的接收超時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) {//查詢文件長度DWORD nLen=0;cFile->QueryInfo(HTTP_QUERY_CONTENT_LENGTH, nLen);//CString strFilename = GetFileName(url,TRUE);nBufLen=nLen;if (nLen <= 0) break;////分配接收數據緩存pBuf = (char*)malloc(nLen+8);ZeroMemory(pBuf,nLen+8);char *p=pBuf;while (nLen>0) {//每次下載8Kint n = cFile->Read(p,(nLen<RECVPACK_SIZE)?nLen:RECVPACK_SIZE);//接收完成退出循環if (n <= 0) break;////接收緩存后移p+= n ;//剩余長度遞減nLen -= n ;}//如果未接收完中斷退出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);//釋放緩存if (pBuf) {free(pBuf);pBuf=NULL;nBufLen = 0 ;}//關閉下載連接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; }

http://bbs.csdn.net/topics/390052882

轉載于:https://www.cnblogs.com/tiandsp/p/7440837.html

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