xroot

VarGetType Return Type

2 posts in this topic

Playing with VarGetType with DllStructCreate and getting return types not expected.

uint; ulong; dword all return Int64, but DllStructSize = 12 correctly.

Please, tell me what this means, or if doing it wrong.

Thanks

local $tStruct = DllStructCreate("uint;ulong;dword")
local $sTypes  = ""

For $i = 1 To 3
    $sTypes &= VarGetType(DllStructGetData($tStruct,$i)) & "," ;@lf
Next

MsgBox(64,@error & " Struct Var Types","Au3 Version="  & @AutoItVersion & @lf & _
                                       "Au3 X64="      & @AutoItX64 & @lf & _
                                       "OS Arch="      & @OSArch & @lf & _
                                       "OS Version="   & @OSVersion & @lf & _
                                       "Struct Size="  & DllStructGetSize($tStruct) & @lf & _
                                       "Struct Types=" & $sTypes)

Here is what Msgbox is on my pc.

Au3 Version=3.3.12.0
Au3 X64=0
OS Arch=X64
OS Version=WIN_7
Struct Size=12
Struct Types=Int64,Int64,Int64

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Here's is why you get what you see: when extracting (with DllStructGetData) items from the structure, AutoIt needs to ensure that there is no misrepresentation of the value. As you already know, uint, ulong and dword all mean unsigned 32-bit integer. AutoIt doesn't have such a variant, so it must store the value in the next larger integral variant, i.e. Int64, the only datatype able to hold all positive 32-bit values above 0x7FFFFFFF which may be stored in the items' structure.

Inside the structure, values occupy the size they are meant to.

Hope this clears the mud.


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