DhcpServerCalloutEntry callback function
The DhcpServerCalloutEntry function is called by Microsoft DHCP Server to initialize a third-party DLL, and to discover for which events the third-party DLL wants notification. The DhcpServerCalloutEntry function is implemented by third-party DLLs.
DWORD CALLBACK DhcpServerCalloutEntry( _In_ LPWSTR ChainDlls, _In_ DWORD CalloutVersion, _Out_ LPDHCP_CALLOUT_TABLE CalloutTbl );
- ChainDlls [in]
Collection of remaining third-party DLLs that provided registry entries requesting notification of DHCP Server events, in REG_MULTI_SZ format.
- CalloutVersion [in]
Version of the DHCP Server API that the third-party DLL is expected to support. The current version number is zero.
- CalloutTbl [out]
Cumulative set of notification hooks requested by all third-party DLLs, in the form of a DHCP_CALLOUT_TABLE structure.
Return values are defined by the application providing the callback.
Upon successful loading of a third-party DLL, Microsoft DHCP Server calls the DLL's DhcpServerCalloutEntry function. If this function call succeeds, Microsoft DHCP Server does not attempt to load any further third-party DLLs, and instead passes the list of remaining third-party DLLs in the ChainDlls parameter. It is the responsibility of the loaded third-party DLL to ensure that:
- other third-party DLLs are loaded
- their DhcpServerCalloutEntry function called
- the merged list of requested notification entry points are returned to Microsoft DHCP Server in the CalloutTbl parameter.
The initially loaded third-party DLL is responsible for maintaining a table of cumulative notification entry points, and upon notification of a particular event, must call all chained third-party DLLs before returning to Microsoft DHCP Server.
Minimum supported client
Minimum supported server
|Windows 2000 Server [desktop apps only]|