I need a DLL I can use with DLL Call but do not know how to make it

[KalInEx]

I want to write a routine using VC++ express 2008 edition so that the execution speed is very fast for some pixel color testing routines I need. Writing the routines should not be difficult for me however making a DLL I Can call using DLLCall without getting errors saying the routine does not exist is not at least not for me =/

What I have done is this...

1: Started a new W32 project selecting DLL as the type

2: Compiled the code that was there it has a function returning 42

3: went into AutoIT using DLLCall and get error 3 tell me the function "fnDLLTest" does not exist

=<

I added a call to MessageBox so I would know at least the dll is loading and it is but that function which is susposeto be an example of an exported function is not being called. Just FYI This is my test CODE in AutoIT.

$1="C:\Documents and Settings\HP_Administrator\Desktop\New Folder\DLLTest2\Release\DLLTest2.dll"

$2=DllCall($1,"none","FNDLLTEST")

MsgBox(1,@error,$2)

The MsgBox shows error code 3 and the text 0. Help will be much appreciated =)

EDIT: The name DNFLLTEST is just my latest try I had the capitalization correct in the beginning.

Edited September 20, 2009 by KalInEx

[KalInEx]

UPDATE: I can call the routine using ordinal value 1 but not by name.

[Richard Robertson]

What is the function declaration in C++? The problem most likely is that you've got a decorated name.

[KalInEx]

Thanks! I googled "dll decorated names" and found a thread at codeguru.com saying that by using "extern C" it will force the names to ANSI C format which for me means the names are preserved. FYI the function prototype is this...

__declspec(dllexport) int DLLTEST(int param);

Still have 1 problem. The routine is being called by name now, its getting the parameter but I do not get a return value back its always 0.

Edited September 20, 2009 by KalInEx

[martin]

Thanks! I googled "dll decorated names" and found a thread at codeguru.com saying that by using "extern C" it will force the names to ANSI C format which for me means the names are preserved. FYI the function prototype is this...

__declspec(dllexport) int DLLTEST(int param);

Still have 1 problem. The routine is being called by name now, its getting the parameter but I do not get a return value back its always 0.

Are you remembering that the return value is an array? So if you have

$Answer = DllCall(..........

$RealAnswer = $Answer[0]

[Andreik]

Thanks! I googled "dll decorated names" and found a thread at codeguru.com saying that by using "extern C" it will force the names to ANSI C format which for me means the names are preserved. FYI the function prototype is this...

__declspec(dllexport) int DLLTEST(int param);

Still have 1 problem. The routine is being called by name now, its getting the parameter but I do not get a return value back its always 0.

Read here.

You will be able to write a simple dll and know how to call the function from AutoIt.