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    • 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
    • By Skysnake
      This is relevant
      From here https://stackoverflow.com/questions/3454315/is-it-possible-to-pin-a-dll-in-memory-to-prevent-unloading
      I use several UDFs on the Forum to do various things.  Those UDFs work very well.
      Effectively the UDFs are DLL wrappers, that make it possible to access DLL functions easily without the long hard slog of DLLCall() every time.
      However, I have now run into the issue that multiple UDF DLLCalls are slow. Not mind numbingly slow, but slow enough to become noticeable with a large of repeated function calls.
      So I was wondering, is it possible to "load a DLL into memory" and leave it there for the duration of my script's lifetime, avoid repeated DLL on-disk reads with a persistent in memory DLL?
      From Microsoft
      https://docs.microsoft.com/en-us/windows/desktop/dlls/about-dynamic-link-libraries
      Looks like what I want to do is: load-time dynamic linking,
      So next question, (a) how do I do this with AutoIt (b) How would this impact on standard AutoIt type DLL calls?
       
      The point is speed.  Is there a different approach?
      Or am I barking up the wrong tree?
      Skysnake
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