Structure in AutoIt

[EndlessLove]

Hello there, I'm new to AutoIt forum. Today, I want to ask a question about Structure in AutoIt

Is there any way to create structure elements with bitfields?

Like in C/C++:

struct
{
  unsigned int anUINT: 1;
  unsigned int anotherUINT : 1;
} test;

Thanks.

[Exit]

DllStructCreate()  ?

And welcome to the Forum.

Edited December 28, 2014 by Exit

[EndlessLove]

DllStructCreate()  ?

And welcome to the Forum.

Hi Exit, thanks for your reply.

I tried that, but I don't know how to set bit-fields for each element in the structure .

_{Sorry for my bad English.}

[UEZ]

Try this:

$tStruct_Test = DllStructCreate("uint anUINT;uint anotherUINT")

DllStructSetData($tStruct_Test, "anUINT", -100) ;either
$tStruct_Test.anotherUINT = 100 ;or

MsgBox(0, "Test", DllStructGetData($tStruct_Test,  "anUINT") & @CRLF & $tStruct_Test.anotherUINT)

Br,

UEZ

Edited December 28, 2014 by UEZ

[Mat]

There is no way to have bit fields in AutoIt. Instead you'll have to use bitwise operators to extract required bits. It's not too tricky to do, but unfortunately it means you can't have the nice syntax we have use for structs at the moment.

For everyone else, the struct in the first post is actually only 1 UINT long, and the two fields are just single bits. That's a very different structure to what you have posted UEZ.

[UEZ]

Sorry, but my C/C++ knowledge is very limited...

 

Br,

UEZ

[LarsJ]

EndlessLove, You can also use an array of arrays, which is much easier to use than DllStructCreate and just as fast.

[Mat]

Sorry, but my C/C++ knowledge is very limited...

Bit fields are hardly ever used in the winapi (in fact I can't think of any structures where they are used), and I have never come across them in practice either. I only know of them because I read the C standard and stumbled across them whilst looking for other information. That's probably why they've never been asked for in AutoIt before as well.

Mat

[EndlessLove]

Thanks everyone for replying.

Try this:

$tStruct_Test = DllStructCreate("uint anUINT;uint anotherUINT")

DllStructSetData($tStruct_Test, "anUINT", -100) ;either
$tStruct_Test.anotherUINT = 100 ;or

MsgBox(0, "Test", DllStructGetData($tStruct_Test, "anUINT") & @CRLF & $tStruct_Test.anotherUINT)

Br,

UEZ

 

Thank you, now I know another way to get/set data of an element of a structure

Bit fields are hardly ever used in the winapi (in fact I can't think of any structures where they are used), and I have never come across them in practice either. I only know of them because I read the C standard and stumbled across them whilst looking for other information. That's probably why they've never been asked for in AutoIt before as well.

Mat

 

I use WM_COPYDATA to send a packet buffer from C++ DLL to AutoIt, so I want to create a structure (IP Header & TCP Header structure) in AutoIt which points to the packet buffer so that I can easily manage the data of the IP/TCP Header structure.

If AutoIt structures can't have bit-fields then I think I will use bitwise operator like you suggest.

Thank you

.

Edited December 29, 2014 by EndlessLove