#include <stdio.h>
#include <Windows.h>
#include <wininet.h>
#define MAXBLOCKSIZE 1024
#pragma   comment   (lib,   "wininet.lib")
void download(const char*);

int main(int argc, char* argv[]){

    download("http://sci.hdu.);

        return 0 ;

 if(argc > 1){
  download((const char*)argv[1]);
 }else{
  printf("Usage: auto-Update url");
 }
 return 0;
}



void download(const char *Url)
{
 HINTERNET hSession = InternetOpen("RookIE/1.0", INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, 0);
 if (hSession != NULL)
 {
  HINTERNET handle2 = InternetOpenUrl(hSession, Url, NULL, 0, INTERNET_FLAG_DONT_CACHE, 0);
  if (handle2 != NULL)
  {
   printf("%s\n",Url);
   byte Temp[MAXBLOCKSIZE];
   ULONG Number = 1;

   FILE *stream;
   if( (stream = fopen( "c:\\1.txt", "wb" )) != NULL )
   {
    while (Number > 0)
    {
     InternetReadFile(handle2, Temp, MAXBLOCKSIZE - 1, &Number);
     
     fwrite(Temp, sizeof (char), Number , stream);
    }
    fclose( stream );
   }
   
   InternetCloseHandle(handle2);
   handle2 = NULL;
  }
  InternetCloseHandle(hSession);
  hSession = NULL;
 }
}

别说你一条代码都看不懂,你要是一条代码都看不懂就应该回去看书,而不是让别人给你读代码.

这是个下载的程序   里面都是些个windows API  函数的功能以及用法楼主自己查
没必要来代码轰炸   如果让别人解释  也是去查msdn然后在告诉你  不如自己动手