ITypeLib->GetLibAttr & TLIBATTR structure

In addition to yesterdays tread about 'Playing with COM', I am hoping to get some help.

I'm trying to get the TLIBATTR structure by loading a dll. I'm able to get the GUID but non of the other members.
There must be something wrong with the way I allocate the TLIBATTR structure ?

!define COM_CallMethod "!insertmacro _COM_CallMethod "
!macro _COM_CallMethod _vto _ParamsDecl _IFacePtr _Params
    System::Call `${_IFacePtr}->${_vto}${_ParamsDecl} ${_Params}`
!macroend
!define ITypeLib->GetLibAttr "${COM_CallMethod}7 (i)i. "
!define ITypeLib->ReleaseTLibAttr "${COM_CallMethod}12 ()i. "
Section
    StrCpy $0 msxml.dll
    System::Call Oleaut32::LoadTypeLib(wr0,*i.r1)
    System::call *(g,i,i,i,i,i)i.R0 ;  TLIBATTR  structure
    ${ITypeLib->GetLibAttr} $1 (R0)
    System::Call *$R0(g.R1,i.R2,i.R3,i.R4,i.R5,i.R6)
    ${ITypeLib->ReleaseTLibAttr} $1 ()
    System::free $R0
    DetailPrint 'TLIBATTR structure'
    DetailPrint GUID=$R1
    DetailPrint CLID=$R2
    DetailPrint SYSKIND=$R3
    DetailPrint MajorVerNum=$R4
    DetailPrint MinorVerNum=$R5
    DetailPrint LibFlags=$R6
SectionEnd 

Or use the attached file for a complete test script.

The TLIBATTR struct is probably more like *(&g16,i,i,&i2,&i2,&i2), but that is only half your problem. GetLibAttr will allocate the struct for you...

!include LogicLib.nsh
!define IUnknown->Release "${COM_CallMethod}2 ()i. "
!define ITypeLib->GetLibAttr "${COM_CallMethod}7 (*i)i. "
!define ITypeLib->ReleaseTLibAttr "${COM_CallMethod}12 (i)i. "
Section
    System::Call 'Oleaut32::LoadTypeLib(w "msxml.dll",*i.r1)i.r0'
    ${If} $0 = 0
        ${ITypeLib->GetLibAttr} $1 '(.R0).r0'
        ${If} $0 = 0
            System::Call '*$R0(&g16.R1,i.R2,i.R3,&i2.R4,&i2.R5,&i2.R6)'
            ${ITypeLib->ReleaseTLibAttr} $1 (R0)
            
            DetailPrint 'TLIBATTR structure'
            DetailPrint GUID=$R1
            DetailPrint CLID=$R2
            DetailPrint SYSKIND=$R3
            DetailPrint MajorVerNum=$R4
            DetailPrint MinorVerNum=$R5
            DetailPrint LibFlags=$R6
        ${EndIf}
        ${IUnknown->Release} $1 ()
    ${EndIf}
SectionEnd 

Edit: The fact that you need &g16 and not just g in a struct is probably a system plugin bug

Thanx for that, it works great now !
it must have been the &g16 thing what was bugging me 🙁