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DLL Start Operations

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Immediately after loading the IHV Extensions DLL, the operating system calls the following IHV Handler functions in this sequence.

  1. The operating system calls the Dot11ExtIhvGetVersionInfo IHV Handler function to determine the interface versions supported by the IHV Extensions DLL. This function is passed a pointer to a DOT11_IHV_VERSION_INFO structure, which the DLL formats with the minimum and maximum interface versions that it supports. Note  For Windows Vista, the IHV Extensions DLL must set the dwVerMin and dwVerMax members of the DOT11_IHV_VERSION_INFO structure to zero.

     

  2. If the IHV Extensions DLL supports an interface version that is supported by the operating system, the operating system calls the Dot11ExtIhvInitService IHV Handler function to initialize the DLL.

The IHV Extensions DLL must follow these guidelines when Dot11ExtIhvInitService is called.

  • The pDot11ExtAPI parameter contains a pointer to a DOT11EXT_APIS structure, which is formatted with the addresses of the IHV Extensibility functions supported by the operating system. The IHV Extensions DLL must copy the DOT11EXT_APIS structure, which is referenced by the pDot11ExtAPI parameter, to a globally-declared DOT11EXT_APIS structure.

  • The pDot11IHVHandlers parameter contains a pointer to a DOT11EXT_IHV_HANDLERS structure, which the IHV Extensions DLL formats with the addresses of the IHV Handler functions that it supports. Note  The DLL must not set any of the members of the DOT11EXT_IHV_HANDLERS structure to NULL.

     

  • The IHV Extensions DLL should perform any internal initialization and resource allocation in preparation for calls to its IHV Handler functions after the DLL returns from Dot11ExtIhvInitService.

For more information about the IHV Extensibility functions, see Native 802.11 IHV Extensibility Functions.

For more information about the IHV Handler functions, see Native 802.11 IHV Handler Functions.