Hi Ed,

I did a bit of digging I'm not sure I like what I've found.
Following is more VB code showing the TYPE for SLS_CHALLDATA.
There appears to be some nesting which is a little intimidating.

Type SLS_MSG_DIGEST
    MessageDigest(16) As Byte 'binary data
End Type

Type SLS_CHALLDATA
    SecretIndex As Long
    Random As Long
    MsgDigest As SLS_MSG_DIGEST
End Type

Type SLS_CHALLENGE
    Protocol As Long
    Size As Long
    ChallengeData As SLS_CHALLDATA
End Type

It looks like SLS_CHALLENGE references SLS_CHALLDATA which further references SLS_MSG_DIGEST.  Is this to say that I must construct a string for each of these structs ?
Also, do you know what MessageDigest(16) As Byte means ?

I'm beginning to wonder if I'm in a bit over my head here.  Or is this just a nasty initiation reserved for rookies ?

Thanks.
>
>>
>>Type SLS_CHALLENGE
>>    Protocol As Long
>>    Size As Long
>>    ChallengeData As SLS_CHALLDATA
>>End Type
>
>
>Oops.  This will be a string, but we need to know what SLS_CHALLDATA looks like before we can construct it.
>>
>>Declare Function SLS_REQUEST Lib "SlsApi" Alias "SLS_Request" ( _
>>                    ByVal pszProductID As String, _
>>                    ByVal pszUserName As String, _
>>                    pRequest As SLS_REQUEST, _
>>                    pPermit As SLS_PERMIT, _
>>                    plLicenceHandle As Long, _
>>                    pChallenge As SLS_CHALLENGE) As Long
>>
>
>
>VFP equivalent declaration, and converters for DWORDs:
>
>
DECLARE INTEGER SLS_REQUEST IN SLSAPI.DLL ;
>      STRING @ lpszProductID, ;
>      STRING @ lpsUserName, ;
>      INTEGER SLS_REQUEST, ;
>      STRING SLS_PERMIT, ;
>      INTEGER plLicenseHandle, ;
>      STRING SLS_CHALLENGE

Carl Chambers
Cardol Data Systems