【转】c++ http下载文件-白红宇

【转】c++ http下载文件

阅读量：6426 次

发布时间：2019-06-23

本文共 1706 字，大约阅读时间需要 5 分钟。

#include 
     
      #include 
      
       #define RECVPACK_SIZE 2048bool 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8K                    int n = cFile->Read(p,(nLen
       
        Close();        Sess.Close();        delete cFile;    }    return ret;}int main() {    DownloadSaveFiles("http://www.nirsoft.net/utils/nircmd.zip","d:\\cppdld_nircmd.zip");    return 0;}