How to return an array from a DLL?

[AZJIO]

I want from the script (au3) call the function from the DLL. The function in the DLL returns an array. Can AutoIt get an array?

the only way?

$a = DllStructCreate("int[120]")

Edited April 20, 2013 by AZJIO

[trancexx]

Array of what, integers? Do you mean pointer to array of integers?

[AZJIO]

If to be exact, float is necessary. I think to change the size not a problem.

[trancexx]

Do you mean exported dll function will return array of floats?

You have to be precise about what you want or have.

[JohnOne]

I've wondered about this.

In order for a dll to fill an array passed by autoit, I fear you might need to know the variant type of an autoit array, and moreover that type might have to be supported as a passable value in DllCall.

I think Struct pointer might be the only way, and be sure also to pass it's size.

[AZJIO]

I think that the array (AutoIt3) is an array of pointers. So will have to use the structure. DLL returns the size of the unknown in advance. I need to get a pointer to a structure? I need to set up data exchange between the script and DLL.

[JohnOne]

Perhaps, but knowing they are pointers is not enough, In C++ you need to know what type of data a pointer points to.

And we are full circle.

I'm sure you know about DllStructGetPointer and DllStructGetSize.

Edited April 20, 2013 by JohnOne

[Richard Robertson]

Since this doesn't seem to be going anywhere fast, I'll speed it up by asking for the dll's function definition.

[Mat]

Hopefully something like:

int myFunction(int* ret, size_t retLen);

We can only hope.

[SolUmBao]

Hi Azjio,

I'm working on the same problem how to solve this problem. Principally the problem is the same whether to pass an array with reals or integers or other types. Actually I think about a 'work around' by RAM-Disks. But maybe one of the next Autoit-versions provide a solution, maybe also even with n-dimensional arrays and structs. But there is also another question. If memory was allocated by a function located in a Dll and there was a way to move the result to Autoit, is there a possibility to free this memory from the side of Autoit?
Actually I am pretty new in this forum, but I'm extremly interested to work through the possibilities and to overcome some problems. Do you know who would be the right member in the group of developers of Autoit to address questions and ideas?

All the best, kind regards!

 

[LarsJ]

The problem and related issues are completely handled and solved by active members. See these threads:

Accessing AutoIt Variables

.NET, C#, VB.NET:
Using .NET libary with AutoIt, possible?
.NET Common Language Runtime (CLR) Framework
DotNet.au3 UDF to access .NET Framework from AutoIt
Using C# and VB Code in AutoIt through .NET Framework

Accessing arrays:
Accessing AutoIt Arrays
Fast Array Management Functions UDF