disable network card

[Jean]

hi all, urgent i need help!

i have vb6 and i want to know how can i disable/enable a network connection
in Win98 and Win2k.
witch API shoud i call?

[Alick [MS]]

If you want to disable net work card, it is really not easy to accomplish
this. One way I know is to call WIN2K
DDK, create a DLL in C and then call it from VB. So, the main functions are
accomplished in C codes, we just use VB to call the created DLL.

Here are just some snipped (but main) codes to provide some ideas.

BOOL StateChange(DWORD NewState, DWORD SelectedItem,HDEVINFO hDevInfo)
{
SP_PROPCHANGE_PARAMS PropChangeParams =
{sizeof(SP_CLASSINSTALL_HEADER)};
SP_DEVINFO_DATA DeviceInfoData = {sizeof(SP_DEVINFO_DATA)};

//
// Get a handle to the Selected Item.
//
if (!SetupDiEnumDeviceInfo(hDevInfo,SelectedItem,&DeviceInfoData))
return FALSE;

//
// Set the PropChangeParams structure.
//
PropChangeParams.ClassInstallHeader.InstallFunction =
DIF_PROPERTYCHANGE;
PropChangeParams.Scope = DICS_FLAG_GLOBAL;
PropChangeParams.StateChange = NewState;

if (!SetupDiSetClassInstallParams(hDevInfo,
&DeviceInfoData,
(SP_CLASSINSTALL_HEADER *)&PropChangeParams,
sizeof(PropChangeParams)))
return FALSE;

//
// Call the ClassInstaller and perform the change.
//
if (!SetupDiCallClassInstaller(DIF_PROPERTYCHANGE,
hDevInfo,
&DeviceInfoData))
return FALSE;

return TRUE;
}

BOOL DisableNetAdapter()
{
HDEVINFO hdi;
BOOL res;

// get a list of all devices of class 'GUID_DEVCLASS_NET'
hdi = SetupDiGetClassDevs(&GUID_DEVCLASS_NET, NULL, NULL,
DIGCF_PRESENT);
if (hdi == INVALID_HANDLE_VALUE)
return FALSE;

res = StateChange(DICS_DISABLE, 0, hdi);

// release the device info list
SetupDiDestroyDeviceInfoList(hdi);

return res;
}

BOOL EnableNetAdapter()
{
HDEVINFO hdi;
BOOL res;

// get a list of all devices of class 'GUID_DEVCLASS_NET'
hdi = SetupDiGetClassDevs(&GUID_DEVCLASS_NET, NULL, NULL,
DIGCF_PRESENT);
if (hdi == INVALID_HANDLE_VALUE)
return FALSE;

res = StateChange(DICS_ENABLE, 0, hdi);

// release the device info list
SetupDiDestroyDeviceInfoList(hdi);

return res;
}

Best Regards,

Alick Ye

This posting is provided "AS IS" with no warranties, and confers no rights.

--------------------
| From: "Jean" <Thunde...@Hotmail.com>
| Newsgroups: microsoft.public.vb.winapi
| Subject: disable network card
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