学步园

C#里有一个WebClient.DownloadData可以用来下载指定网址的内容，

在VC里一样有这样的功能。代码实现很简单，如下：

#include<wininet.h><br /> #pragma comment(lib,"wininet.lib") </p> <p>void CTAXGDlg::downLoadData(void)<br /> {<br /> DWORD length=0;<br /> BYTE buffer[1024];<br /> memset(buffer,0,1024);<br /> HINTERNET hInternet; </p> <p> hInternet=InternetOpen(_T("Testing"),INTERNET_OPEN_TYPE_PRECONFIG,NULL,NULL,0);<br /> if (hInternet==NULL)<br /> {<br /> //cout<<_T("Internet open failed!")<<endl;<br /> return;<br /> } </p> <p> HINTERNET hUrl;<br /> hUrl=InternetOpenUrl(hInternet,_T("http://www.google.cn/images/isr_g.png"),NULL,0,INTERNET_FLAG_RELOAD,0);<br /> if (hUrl==NULL)<br /> {<br /> // cout<<_T("Internet open url failed!")<<endl;<br /> InternetCloseHandle(hInternet);<br /> return;<br /> } </p> <p> BOOL hwrite;<br /> DWORD written;<br /> HANDLE hFile;<br /> hFile=CreateFile(_T("d://sss.jpg"),GENERIC_WRITE,0,0,CREATE_ALWAYS,FILE_ATTRIBUTE_NORMAL,0);<br /> if (hFile==INVALID_HANDLE_VALUE)<br /> {<br /> //cout<<_T("Create File failed!")<<endl;<br /> InternetCloseHandle(hUrl);<br /> InternetCloseHandle(hInternet);<br /> return;<br /> } </p> <p> BOOL read;<br /> while(1)<br /> {<br /> read=InternetReadFile(hUrl,buffer,sizeof(buffer),&length);<br /> if(length==0)<br /> break;<br /> hwrite=WriteFile(hFile,buffer,sizeof(buffer),&written,NULL);<br /> if (hwrite==0)<br /> {<br /> //cout<<_T("Write to file failed!")<<endl;<br /> CloseHandle(hFile);<br /> InternetCloseHandle(hUrl);<br /> InternetCloseHandle(hInternet);<br /> return;<br /> }<br /> }<br /> CloseHandle(hFile);<br /> InternetCloseHandle(hUrl);<br /> InternetCloseHandle(hInternet);<br /> } 

代码很好，很强大！