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    • By taylansan
      Hello Autoit,
      I'm very new to DllCall function, in fact never used it, but I'm just curious about it.
      I found @toasterking's awesome beginner friendly dll GUI: 
      I searched for some easier functions (less input / less output parameters), and I found GetFileSize function (I didn't modify his code, just using the GUI): 
      https://learn.microsoft.com/en-gb/windows/win32/api/fileapi/nf-fileapi-getfilesize
      So, this is what I did: 

       
      The function itself is executing like this, but the output is 0 and -1
      DllCall("kernel32.dll","int","GetFileSize","HANDLE","D:\DllCall GetFileSize Example.au3","DWORD*","$hello")
       
      Then, I tried to execute my script (very simple) and put it into D drive: 
      ;DllCall("kernel32.dll", "int", "GetFileSize", "HANDLE", "D:\DllCall GetFileSize Example.au3") $aDllCallReturn = DllCall("kernel32.dll","int","GetFileSize","HANDLE","D:\DllCall GetFileSize Example.au3","DWORD*","$hello") For $i = 0 To UBound($aDllCallReturn) - 1 ConsoleWrite($i & ": " & $aDllCallReturn[$i] & @CRLF) ;MsgBox(0, $i, $aDllCallReturn[$i]) Next ;ConsoleWrite($hello & @CRLF) The result is as the following (same as the screenshot): 
      0: -1 1: 0x00000000 2: 0 This file size is 403 bytes in my computer, it's very small, I expected to see 403 somewhere, but I don't know where I made it wrong. 
      So, now I have some questions: 
      1. Do I really need to use lpFileSizeHigh or can I use "hello"?
      2. Do I always have to put $ in the beginning of the parameter? I tried without $ in his GUI, I got an error. So, I think $ is a must. 
      3. But if I write as $hello (expecting this will store the file size), when I ConsoleWrite it, Autoit becomes angry because "undeclared global variable". 
      4. If somehow $hello will be the output to my file size, why do I need to return an array $aDllCallReturn which contains 3 elements? So, I have one $hello + 3 items from the array = I have 4 outputs total. But Microsoft says this function has only one return "[out, optional] LPDWORD lpFileSizeHigh ". I'm confused. 
      Please note that; the goal for me is to use the DllCall function, not to get the file size by using FileGetSize() or some other existing functions. 
    • By FrancescoDiMuro
      Good morning Forums 
      In these days, I am working on a project that involved me to use some Windows APIs to obtain some information about Terminal Servers.
      I'm doing this using wtsapi32.dll in a VBA Project, but, the lack of knowledge about few things threated in the articles make this quite difficult to
      implement and understand at the same time.
      The most difficult thing I'm facing is "translating" C/C++ functions or struct in VBA when pointers are used, or pointers of pointers, and so on.
      Since VBA seems to not have a pointer type, to make those functions work I need to implement other functions taken from other DLLs, and this confuses me a lot.
      For example, starting from this code, I splitted all the functions and all the definitions to understand why they are there, and why I need to use them.
      At the end, I've found out that the code I was going to implement starting from the functions provided in the Microsoft Docs won't be ever be able to work without some supplementary functions which are not mentioned anywhere.
      So, I was wondering if someone would please point me out to a good and practical exaplanation about pointers (in general) or specifically for VBA, because I need to use them quite often in these days, and I'd like to understand what I am doing.
      Thanks in advance.

      Best Regards and Stay at home 🏡
       
    • By IndianSage
      Hi,
      My AutoIt script is as folllows:
      ;use for calling function add2NosA in dll ;Local $vNo1 = 33 ;Local $vNo2 = 11 ;use for calling function sortNos in dll Local $vNo1 = [11,7,9] Local $vNo2 = [1,3,2] ; _ArrayDisplay($vNo1, "vNo1 display") ; _ArrayDisplay($vNo2, "vNo2 display") ;Local $hWnd = DllOpen("E:\CV-Dell-1\autoit3\myComObj1.dll") Local $hWnd = ObjCreate("myComObj1.clsMath") if (@error) Then MsgBox (0, "Error", "Error1 = " & @error) Exit EndIf ;function call method - DllCall with function name ;Local $aRes = DllCall($hWnd, "int", "addNosA", "int", $vNo1, "int", $vNo2) ;Local $aRes = DllCall($hWnd, "Ptr", "sortNos", "Array", $vNo1, "Array", $vNo2) ;function call method - $hWnd.<function name> ;Local $aRes = $hWnd.add2NosA($vNo1, $vNo2) ; this works fine with ObjCreate Local $aRes = $hWnd.sortNos($vNo1, $vNo2) if (@error) Then MsgBox (0, "Error", "Error2 = " & @error) DllClose($hWnd) Exit EndIf ;use appropriate msgbox ;MsgBox(0,"Result", "Result = " & $vNo1[0]) MsgBox(0,"Result", "Result = " & $aRes) _ArrayDisplay($vNo1, "vNo1 display") _ArrayDisplay($aRes , "aRes display") DllClose($hWnd) My VB.Net - ClassLibrary - Dll - COM obj is as follows - has 2 functions - add2NosA and sortNos:
      <ComClass(clsMath.ClassId, clsMath.InterfaceId, clsMath.EventsId)> Public Class clsMath Public Const ClassId As String = "3A42F85E-24C8-4BAA-91B5-AE56C4683C13" Public Const InterfaceId As String = "D99D7C79-2BA7-4A33-B7BC-9B7F19FDF828" Public Const EventsId As String = "CA128AC4-580C-4112-9EAD-8D1599E3F37A" Public Sub New() MyBase.New() End Sub Public Function add2NosA(ByVal no1 As Integer, ByVal no2 As Integer) As Integer Return (no1 + no2) End Function Public Sub sortNos(ByRef no1 As Array, ByRef no2 As Array) Array.Sort(no1) no2 = no1 End Sub End Class  Over all I tried various 8 options mentioned in the attached Excel file - with only 1 combination working.
      Overall could not make Array returned capture in AutoIt script. 
      Can someone help please?
      Thanks in  advance.
      Options-Tried-Matrix-Results.xlsx
    • By IndianSage
      I have create a function in FreeBasic like below:
      Extern "Windows-MS" Type tA f1 As Integer f2 As Integer End Type Public Function _switchOrder(ByVal no1 As Integer, ByVal no2 As Integer) As tA Export Dim result As Integer Dim taa As tA taa.f1 = no2 taa.f2 = no1 Return taa End Function End Extern Caller AutoIt code is:
      #include <MsgBoxConstants.au3> Global Const $sTag_ftdi_version_info="struct; int no1a; int no2a; endstruct" Local $aRet=DllCall("Math1.dll","Ptr","_switchOrder", "Int", 10, "Int", 30) ;MsgBox (0,"",@error & "-" & $aRet[0] & "-" & $aRet[1]& "-" & $aRet[2]) Local $t_ftdi_version_info=DllStructCreate($sTag_ftdi_version_info,$aRet[0]) MsgBox (0,"msg1=",@error & "---" & $aRet[0] & "-" & $aRet[1]& "-" & $aRet[2]) ;Local $retData1 = DllStructGetData($t_ftdi_version_info,"",1) Local $retData1 = DllStructGetData($t_ftdi_version_info,"no1a") MsgBox (0,"msg2=",@error & "--" & $retData1) ;Local $retData1 = DllStructGetData($t_ftdi_version_info,"",2) Local $retData1 = DllStructGetData($t_ftdi_version_info,"no2a") MsgBox (0,"msg2=",@error & "--" & $retData1) ;ConsoleWrite(DllStructGetData($t_ftdi_version_info,"",2) & "--" & @error) ;ConsoleWrite(DllStructGetData($t_ftdi_version_info,"no2a") & @CRLF) ;ConsoleWrite(DllStructGetData($tversion_str,1) & @CRLF) Getting error 2 for DllStructGetData or it give Close Application AutoIt popup message. 
      Certainly DllCall is not returning pointer to the Structure in $aRet[0] hence issue.
      Can someone help me fix this please?
      Thanks in advance.
       
       
    • By xYuri
      This simple dllcall gives me error 5, access denied,
      Func _WinAPI_VkKeyScan($__key) _WinAPI_SetLastError(0) $res = DllCall('User32.dll', 'SHORT', 'VkKeyScan', 'CHAR', $__key) _xConsole('res: '&$res) $_LastErr = _WinAPI_GetLastError() If $_LastErr <> 0 Then _xConsole('Err: {' & $_LastErr & '}> ' & _WinAPI_GetLastErrorMessage()) Return $res EndFunc Am i doing something wrong?
      Also tried VkKeyScanA and W
      Edit:
      I want to send `:` via PostMessage() WM_KEYDOWN
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