AutoHotkey Community

A struct is a set of values in the memory, where the order and lenght of each member is defined.

For example a the Struct Point:

We have 2 int - that makes a 2 * 4 Bytes Memory block. (an int consumes 4 Bytes, in hex view 00 00 00 00)
X := 0xFF
Y := 0xFF
This will look like..

...in the memory. (each byte consuming 2 digits in hex view)

To place these nums in the struct:

The comments tell what happens in the memory.

Hope this helps

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http://securityvision.ch
AHK 2D GAME ENGINE

Very helpful, confirms pretty much what I thought. Thanks IsNull.

For strings, its the address of the string right? Could I do something like this to add the address of the string at the offset 4:


Would that work? Or would I have to change the type or anything like that?

IsNull dont forget, if (asc = you) then break right ??

You are correct.
I asked the same question not too long ago .

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paradigm.shift:=(•_•)┌П┐RTFM||^.*∞

AHK will see the string as an unsigned integer, so yes it should be ok. The thing that you have to make sure of is that the pointer contains the valid data.

Be thankful its not c++ where the type also has to be converted ..

You should definatly take a look at this:

http://www.autohotkey.com/forum/post-91578.html#91578

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paradigm.shift:=(•_•)┌П┐RTFM||^.*∞

Well, strings are a bit special here. Strings are representated as numbers in the memory - look after ASCII Table to understand.) As TLM joked about (:mrgreen:), you have to test against NULL:

As I said before, every type needs to have a defined length in the memory. But C strings don't have that. The address of a string is the pointer to the first byte - the first char.
So how does we know the strings length? We have to read byte for byte (type char) - until we reach a NULL Byte. NULL Bytes terminating a string.

You can test this:




Its important to understand that "World" is not erased from the memory - it only lies behind the NULL byte and is still accessible with Memoryoperators like numget().

_________________
http://securityvision.ch
AHK 2D GAME ENGINE

Thanks for the explanation. And thanks also for the link TLM, looks good, that'll give me something to read this evening

EDIT: Woop, thanks to you guys and that post TLM linked to, I have just written my first successful (and quite pointless, but it was a learning experience) DllCall. Thanks. I now know much more about this sort of stuff.

Hi svi,
I sure took a long time getting back to this thread.
I don't see how your code help to know what the top level menu selection was.
For example in Notepad: File->Open...
becomes just "&Open... Ctrl+O"

So if I wanted to capture the menu selection to repeat it, i don't know what menu to start with, such as "File", "Edit","Format" ...

Do you have anything for this part of the selection process?