Disabling/enabling network interfaces via WinAPI

Question

Here is my attempt to disable/enable network adapters on Windows:

void EnableNetDevice(bool aState, int index)
{
  HDEVINFO NetPnPHandle;
  SP_PROPCHANGE_PARAMS PCHP;
  SP_DEVINFO_DATA DeviceData;
  NetPnPHandle = SetupDiGetClassDevs(&GUID_DEVCLASS_NET, 0, 0, DIGCF_PRESENT);

  if (NetPnPHandle == INVALID_HANDLE_VALUE)
  {
        return;
  }

  DeviceData.cbSize = sizeof(SP_DEVINFO_DATA);
  SetupDiEnumDeviceInfo(NetPnPHandle, index, &DeviceData);
  PCHP.ClassInstallHeader.cbSize = sizeof(SP_CLASSINSTALL_HEADER);

  if (SetupDiSetClassInstallParams(NetPnPHandle,&DeviceData,&PCHP.ClassInstallHeader,sizeof(SP_PROPCHANGE_PARAMS)))
  {
        PCHP.ClassInstallHeader.cbSize = sizeof(SP_CLASSINSTALL_HEADER);
        PCHP.ClassInstallHeader.InstallFunction = DIF_PROPERTYCHANGE;
        PCHP.HwProfile = 0;
        PCHP.Scope = DICS_FLAG_CONFIGSPECIFIC;
        if (aState) PCHP.StateChange = DICS_ENABLE;
        else  PCHP.StateChange = DICS_DISABLE;
        SetupDiSetClassInstallParams(NetPnPHandle,&DeviceData,&PCHP.ClassInstallHeader,sizeof(SP_PROPCHANGE_PARAMS));
        SetupDiCallClassInstaller(DIF_PROPERTYCHANGE,NetPnPHandle,&DeviceData);
  }

  DeviceData.cbSize = sizeof(SP_DEVINFO_DATA);
  SetupDiDestroyDeviceInfoList(NetPnPHandle);
}

The problem is it works perfectly on Windows XP but doesn't work on Win 7 :(

Could you help me please find the bug?

Thank you very much!

Are you running with elevated privileges? If not you need to be. — Captain Obvlious
– Captain Obvlious, Commented Jun 26, 2013 at 22:48
You should also be checking the return value of each function call for failure and using GetLastError to determine the error condition. — Captain Obvlious
– Captain Obvlious, Commented Jun 26, 2013 at 22:50
Actually I found the real problem. There is a glitch with function SetupDiCallClassInstaller - it always return FALSE on x64 OS! So it doesn't work on Win XP x64, Win 7 x64, etc... I have no idea how to fix it ;( — The_Immortal
– The_Immortal, Commented Jun 26, 2013 at 23:30

White hawk · Accepted Answer · 2013-10-22 08:44:31Z

6

It's simply a requirement to call the function from a 64-bit process on x64 OS. See http://msdn.microsoft.com/en-us/library/windows/hardware/ff541255(v=vs.85).aspx

answered Oct 22, 2013 at 8:44

White hawk

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1 Comment

bkausbk Over a year ago

Yes indeed, 32 bits processes running under 64 bits operating system are not able to call that API methods. You have to create a 64 bits executable.

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