C++ 获取URL图片、html文件，CInternetSession 【转】

http://blog.csdn.net/gnixuyil/article/details/7688439

获取网络图片

CString URL="http://www.google.com.hk/images/srpr/logo3w.png"

CInternetSession session;
CHttpFile *httpFile = (CHttpFile *)session.OpenURL(URL);
CStdioFile imgFile;
char buff[1024];    // 缓存

imgFile.Open("图片名字.png", CFile::modeCreate | CFile::modeWrite | CFile::typeBinary);

DWORD dwStatusCode;
httpFile->QueryInfoStatusCode(dwStatusCode);

if(dwStatusCode == HTTP_STATUS_OK) {
    int size=0;
    do {
        size = httpFile->Read(buff,1024);    // 读取图片
        imgFile.Write(buff,size);
    }while(size > 0);
}

httpFile->Close();
session.Close();

获取URL的html

CInternetSession session;
CHttpFile *httpFile = (CHttpFile *)session.OpenURL(m_URL);

DWORD dwStatusCode;
httpFile->QueryInfoStatusCode(dwStatusCode);

CString getdata=_T("");

if(dwStatusCode == HTTP_STATUS_OK) {
    CString line_data=_T("");
    while(httpFile->ReadString(line_data)) {
         getdata += line_data;          // 读取html
    }
     getdata.TrimRight();
}

httpFile->Close();   // html数据已经放在getdata中
session.Close();

// 如果 getdata 中保存的是UTF_8网页（可以看html的meta字段）

strCoding cfm;  // 编码转换类，详情请看下方连接

string temp = (LPCSTR)getdata.GetBuffer();  // 网页数据，转换成string型
string output;
// UTF_8转GB2312，让MFC控件能显示
cfm.UTF_8ToGB2312(output,(char *)temp.data(),strlen(temp.data()));

// 若MFC字符集为Unicode的话，还需要将多字节转为宽字节
temp = output;
DWORD dwNum = MultiByteToWideChar (CP_ACP, 0, temp.c_str(), -1, NULL, 0);
wchar_t *pwText;
pwText = new wchar_t[dwNum];
MultiByteToWideChar (CP_ACP, 0, temp.c_str(), -1, pwText, dwNum);

// 取得转换后结果 m_data 用于显示
m_data = pwText;
delete []pwText;

编码转换类： http://blog.csdn.net/gnixuyil/article/details/7688469

//下载文件并保存为新文件名

#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8K

                    int 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;

}