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DllCall - to my dll function - returns blank or zero only. - (Moved)

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I created dll with one function _add(no1 as integer, no2 as integer) as Integer in FreeBasic, vb.net and c#.net. Used the same to  get the return values but instead i get back only

blank(With FreeBasic dll) or zero (Vb.net and C#).

Code is as follows: (Run environment is Windows 7 SP1 -dot net framework - above 4.5) 

#include <MsgBoxConstants.au3>
;Local $hDLL = DllOpen("E\CV-Dell-1\autoit3\clsAddMul.dll")
;Local $hDLL = DllOpen(@ScriptDir & "\clsAddMul.dll")
;Local $hDLL = DllOpen(@ScriptDir & "\clsClass2.dll")
Local $hDLL = DllOpen(@ScriptDir & "\Math1.dll")

Local $aResult = 555

;$aResult = DllCall(@ScriptDir & "\Math1.dll", "int", "_add", "int", 7, "int", 😎
$aResult = DllCall($hDLL, "Int", "_add", "Int", 7, "Int", 😎
$aResult = DllCall($hDLL, "int", "_add", "int", 7, "int", 😎
MsgBox (0, "Result", "Total = " & $aResult)

;MsgBox (0, "Result2", "Total2 = " & DllCall($hDLL, "Int", "_add", "Int", 7, "Int", 8))

Whats wrong here? 

I am not sure I can ask such help here or not.

If not allowed, forgive me. I am first time participating and new to this.




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$aResult is an array. Please read help.

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  • Moderators

Moved to the appropriate forum, as the Developer General Discussion forum very clearly states:


General development and scripting discussions. If it's super geeky and you don't know where to put it - it's probably here.

Do not create AutoIt-related topics here, use the AutoIt General Help and Support or AutoIt Technical Discussion forums.

Moderation Team

Public_Domain.png.2d871819fcb9957cf44f4514551a2935.png Any of my own code posted anywhere on the forum is available for use by others without any restriction of any kind

Open spoiler to see my UDFs:


ArrayMultiColSort ---- Sort arrays on multiple columns
ChooseFileFolder ---- Single and multiple selections from specified path treeview listing
Date_Time_Convert -- Easily convert date/time formats, including the language used
ExtMsgBox --------- A highly customisable replacement for MsgBox
GUIExtender -------- Extend and retract multiple sections within a GUI
GUIFrame ---------- Subdivide GUIs into many adjustable frames
GUIListViewEx ------- Insert, delete, move, drag, sort, edit and colour ListView items
GUITreeViewEx ------ Check/clear parent and child checkboxes in a TreeView
Marquee ----------- Scrolling tickertape GUIs
NoFocusLines ------- Remove the dotted focus lines from buttons, sliders, radios and checkboxes
Notify ------------- Small notifications on the edge of the display
Scrollbars ----------Automatically sized scrollbars with a single command
StringSize ---------- Automatically size controls to fit text
Toast -------------- Small GUIs which pop out of the notification area


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