屏蔽拨号弹出用户和密码的提示框

RASENTRY entry;

       ::ZeroMemory(&entry, sizeof(entry));

entry.dwSize=sizeof(entry); 
DWORD size=sizeof(entry); 
BOOL dwRet1=RasGetEntryProperties(NULL,ENTRY_NAME,&entry,&size,NULL,NULL);




        entry.dwfOptions &= ~RASEO_PreviewUserPw;
dwRet1 = RasSetEntryProperties(NULL,ENTRY_NAME,&entry,sizeof(RASENTRY),NULL,NULL); 
if(!dwRet1)
{ 
              ok
}