DLL HELP!

[SDX2000]

Hi,

I would be grateful if some body could tell me how to pass a pre-allocated buffer to a DLL function?

Eg.

DllCall("user32.dll", "int", "wsprintf", "str", "", "str", "%s", "str", "Hello World")

Note:

1)I need to pass the pre-allocated buffer as the first argument.

2)How do I call a Dll function with a calling convention other than __stdcall

[piccaso]

for 2:

cdecl ?

for 1:

DllStructCreate()

DllStructGetPtr() or so...

[SDX2000]

Thanks for the extremely prompt reply. Though I could not find the aforementioned functions within the version of autoit I have with me (v3). Let me download the latest and get back to you.

for 2:

cdecl ?

Yes cdecl would be good. If this were possible we might be able to use a variable number of arguments.

[piccaso]

cdecl is supported, all sqlite exports are cdecl

from helpfile:

By default, AutoIt uses the 'stdcall' calling method. To use the 'cdecl' method place ':cdecl' after the return type.
DllCall("SQLite.dll", "int:cdecl", "sqlite3_open", "str", $sDatabase_Filename , "long_ptr", 0).

[SDX2000]

Thanks again. That was most helpful.

[piccaso]

your welcome

if its wsprintf you want to use make sure you read the warnings on msdn.

and btw. did you look at the StringFormat() function?

its like sprintf maybe your satisfied with that...

[SDX2000]

Nah, wsprintf was only meant as an example. Actually I developed a wrapper around the Win Sock API and exported my functions from a dll. I Needed some way to pass a pre-allocated buffer to the recv() (WinSock API)

But I was rather surprised to see the same functionality as part of the AutoIt function set in the latest version (v3.2)