WinSLIStartup

The WinSLIStartup function allows an application using the SLI verbs to specify the version of Windows LUA required and to retrieve details of the specific Windows LUA implementation. This function must be called by an application to register itself with a Windows LUA implementation before issuing any further Windows LUA calls.

int WINAPI WinSLIStartup(
  WORD wVersionRequired,  
  LUADATA FAR *lpLuaData  
);
 

Parameters

wVersionRequired

Specifies the version of Windows LUA support required. The high-order byte specifies the minor version (revision) number; the low-order byte specifies the major version number.

lpLuaData

Pointer to the LUADATA structure containing the returned version number information.

Return Values

The return code specifies whether the application was registered successfully and whether the Windows LUA implementation can support the specified version number. If the value is zero, it was registered successfully and the specified version can be supported. Otherwise, the return code is one of the following:

WLUASYSNOTREADY

The underlying network subsystem is not ready for network communication.

WLUAVERNOTSUPPORTED

The version of Windows LUA support requested is not provided by this particular Windows LUA implementation.

WLUAINVALID

The Windows LUA version specified by the application is not supported by this DLL.

WLUAFAILURE

A failure occurred while the Windows LUA DLL was initializing. This usually occurs because an operating system call failed.

WLUAINITREJECT

WinSLIStartup was called multiple times.

Remarks

To support future Windows LUA implementations and applications that may have functionality differences, a negotiation takes place in WinSLIStartup. An application passes to WinSLIStartup the Windows LUA version that it can use. If this version is lower than the lowest version supported by the Windows LUA DLL, the DLL cannot support the application and WinSLIStartup fails. If the version is not lower, however, the call succeeds and returns the highest version of Windows LUA supported by the DLL. If this version is lower than the lowest version supported by the application, the application either fails its initialization or attempts to find another Windows LUA DLL on the system.

This negotiation allows both a Windows LUA DLL and a Windows LUA application to support a range of Windows LUA versions. An application can successfully use a DLL if there is any overlap in the versions. The following table illustrates how WinSLIStartup works in conjunction with different application and DLL versions:

Note  The application that uses SLI verbs must call WinSLIStartup prior to issuing any other LUA commands. However, WinSLIStartup needs to be called only once per application. If it is called multiple times, the subsequent calls will be rejected.

Details of the actual LUA implementation are described in the WLUADATA structure, defined as follows:

typedef struct { WORD wVersion;
            char szDescription[WLUADESCRIPTION_LEN+1];
            } LUADATA;
 

Having made its last Windows LUA call, an application should call the WinSLICleanup routine.

Each LUA application that uses SLI verbs must make a WinSLIStartup call before issuing any other LUA calls.

See Also

WinSLICleanup