用InternetOpen下载小文件 vc c++

文章改自：

http://hi.baidu.com/hacknothack/blog/item/4ca77710bc8e97fdc3ce79ad.html

使用vc6.0通过

#include"stdafx.h"
#include<windows.h>
#include<wininet.h>
#include<iostream.h>
#pragmacomment(lib,"wininet.lib")
voidmain()
{

DWORDbyteread=0;
charbuffer[100];
memset(buffer,0,100);
HINTERNETinternetopen;

internetopen=InternetOpen("Testing",INTERNET_OPEN_TYPE_PRECONFIG,NULL,NULL,0);
if(internetopen==NULL)
{
cout<<"Internetopenfailed!"<<endl;
return;
}

HINTERNETinternetopenurl;
internetopenurl=InternetOpenUrl(internetopen,"http://dt.163.com/images/news/0605/news02053101_5.jpg",NULL,0,INTERNET_FLAG_RELOAD,0);
if(internetopenurl==NULL)
{
cout<<"Internetopenurlfailed!"<<endl;
gotothere;
}

BOOLhwrite;
DWORDwritten;
HANDLEcreatefile;
createfile=CreateFile("c://sss.jpg",GENERIC_WRITE,0,0,CREATE_ALWAYS,FILE_ATTRIBUTE_NORMAL,0);
if(createfile==INVALID_HANDLE_VALUE)
{
cout<<"CreateFilefailed!"<<endl;
gotonext;
}

BOOLinternetreadfile;
while(1)
{
internetreadfile=InternetReadFile(internetopenurl,buffer,sizeof(buffer),&byteread);
if(byteread==0)
break;
hwrite=WriteFile(createfile,buffer,sizeof(buffer),&written,NULL);
if(hwrite==0)
{
cout<<"Writetofilefailed!"<<endl;
gotohere;
}
}

cout<<"Finisheddownloading!"<<endl;

here:
CloseHandle(createfile);
next:
InternetCloseHandle(internetopenurl);
there:
InternetCloseHandle(internetopen);

}