VB中检测是否连网2010-03-12利用WIN95中的注册表建植,在注册表的HKEY-LOCAL-MACHINESystemCurrentControlSetServicesRemoteAcces下,当计算机连上因特网时,Remote Connection的植为01 00 00 00,反之,为00 00 00 00,通过这一建植可判断是否连网。1.建立新模块public const ERROR-SUCCESS= 0& public const APINULL= 0& public const HKEY-LOCAL-MACHINE= &H80000002 public ReturnCode as long声明API函数RegCloseKey() RegQueryValueEx()自定义函数public function ActiveConnection() as boolean dim hKey as long dim lpSubKey as string dim lpReserved as long dim lpType as long dim lpData as long dim lpcbData as long ActiveConnection=False lpSubKey="SystemCurrentControlSetServicesRemoteAccess" ReturnCode=RegOpenKey(HKEY-LOCAL-MACHINE,lpSubKey,phkResult) if ReturnCode=ERROR-SUCCESS then hKey=phkResult lpValueName="Remote Connection" lpReserved=APINULL lpType=APINULL lpData=APINULL lpcbData=APINULL ReturnCode=RegQueryValueEx(hKey,lpValueName,lpReserved,lpType,ByVal lpData,lpcba ta) lpcbData=Len(lpData) ReturnCode=RegQueryValueEx(hKey,lpValueName,lpReserved,lpType,ByVal lpData,lpcba ta) if ReturnCode=ERROR-SUCCESS then if lpData=0 then ActiveConnection=false else ActiveConnection=True end if end if RegCloseKey(hKey) end if end funtion2.新建窗体priate sub Command1-click() if ActiveConnection=True then msgbox "OK!" else msgbox "ERROR!" end sub