Datatype from DLLStruct

[HurleyShanabarger]

Hello,

is it possible to get the datatype inside a structure giving the same result as the function VarGetType?

If you take a look at his example:

Dim $sStruct = "struct;boolean Test_Bool;uint Test_UInt;char Test_Char[1];endstruct"
Dim $tStruct = DllStructCreate($sStruct)
Dim $vBool = False

ConsoleWrite("Bool by Dim:    " & VarGetType($vBool) & @CRLF)

DllStructSetData($tStruct, 1, False)
ConsoleWrite("IsStruct?:      " & VarGetType($tStruct.Test_Bool) & @CRLF)

$vBool = DllStructGetData($tStruct, 1)
ConsoleWrite("Bool by struct: " & VarGetType($tStruct.Test_Bool) & @CRLF)

$vBool = True
ConsoleWrite("Bool by assign: " & VarGetType($vBool) & @CRLF)

If the variable is directly assigned the correct datatype is shown (Bool by Dim: Bool).

If the value is set using DllStructSetData the returned datatype is Int32 - which I guess is the internal AutoIt representation.

Is there away to receive the datatype that is actually held within the elements of the structure?

Edited February 2, 2021 by HurleyShanabarger
Update script

[Nine]

Help file says :

 

Element

Which element of the struct you want to access, starting at 1 or the element name as defined in DllStructCreate().

[HurleyShanabarger]

You are right, but does not change the outcome.

[jchd]

Here's a way to get byte fundamental datatypes:

Local $t = DllStructCreate("byte;char;wchar;short;ushort;int;uint;int64;float;double;ptr;boolean;bool")
DllStructSetData($t, 1, 0x3C)
DllStructSetData($t, 2, 't')
DllStructSetData($t, 3, 'µ')
DllStructSetData($t, 4, -12345)
DllStructSetData($t, 5, 23456)
DllStructSetData($t, 6, -3456789)
DllStructSetData($t, 7, 4567890)
DllStructSetData($t, 8, 123456789123456)
DllStructSetData($t, 9, 123.456789)
DllStructSetData($t, 10, 123.4567891234567)
DllStructSetData($t, 11, DllStructGetPtr($t))
DllStructSetData($t, 12, True)
DllStructSetData($t, 13, True)
ConsoleWrite(_VarDump($t) & @LF)

It has also been posted another way, using a Windows API but I don't remember which. Use search feature.

Yet you can't differentiate a Boolean or a Bool from their byte or int internal representation in the structure.

Dump.au3

Edited February 2, 2021 by jchd

[Nine]

42 minutes ago, jchd said:

It has also been posted another way, using a Windows API but I don't remember which.

_WinAPI_DisplayStruct ?

[jchd]

Yes but this requires to supply the struct tag string to get back types. It's easier to grab struct element types by regex!

Or, is the tag supplied is an empty string, then you get a useless list of bytes.