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GetNumberOfInterfaces.md

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Function name : GetNumberOfInterfaces

Group: IP Helper - Library: iphlpapi

Returns the number of network interfaces on the local computer, including the loopback interface.

Declaration:

DWORD GetNumberOfInterfaces(
  PDWORD pdwNumIf  // pointer to number of interfaces
);

FoxPro declaration:

DECLARE INTEGER GetNumberOfInterfaces IN iphlpapi;
	INTEGER @ pdwNumIf

Parameters:

pdwNumIf [out] Pointer to a DWORD variable that receives the number of interfaces on the local computer.

Return value:

If the function succeeds, the return value is NO_ERROR (0). If the function fails, use FormatMessage to obtain the message string for the returned error.

Comments:

The number of network interfaces returned by this function is one more ( that is the loopback interface ) than the number of adapters returned by the GetAdaptersInfo and GetInterfaceInfo functions.

See also: if_indextoname, if_nametoindex.