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[Solved] I need help dealing with a C++ DLL [ pointer to pointer ]


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welcome
I need help dealing with a C++ DLL

Specify that I need help with how to use this function

struct libusb_device;

typedef struct libusb_context libusb_context;

ssize_t LIBUSB_CALL libusb_get_device_list(libusb_context *ctx,libusb_device ***list);

My problem is how to deal with "libusb_device ***list"

my code 

$libusb_device  = DllStructCreate("PTR")

Func libusb_init()
 $Var = DllCall($libusb0, "ptr", "libusb_init",'ptr',$_libusb_device_handle_Ptr)
 If @error Then Return False
 Return $Var[1]
EndFunc

Func libusb_get_device_list()
    MsgBox(0,VarGetType($_libusb_device_handle_Ptr),$_libusb_device_handle_Ptr)
 $Var = DllCall($libusb0, "int", "libusb_get_device_list","ptr",$_libusb_device_handle_Ptr,"ptr*",POINTER(POINTER($libusb_device)))
  $Error = @error
  If $Error Then Return False
 MsgBox(0,VarGetType($Var),$Error&@CRLF&$Var)
 _ArrayDisplay($Var)
  Return $Var[1]
EndFunc

 

Thank you

iLibUSB.dll iLibUSB_32.dll libusb.h

Edited by DevMode

dongel.png

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Hello. Please next time share a runnable code. Here is an example I wrote years ago.

 

#include <Array.au3>

Global Enum $LIBUSB_SUCCESS = 0
Global $g_sLibName = @AutoItX64 ? "iLibUSB.dll" : "iLibUSB_32.dll"
Global $g_hlibusb = DllOpen($g_sLibName)


_Test()

Func _Test()
    _libusb_init()
    Local $ahDevicesList = _libusb_get_device_list()
    _ArrayDisplay($ahDevicesList)
    _libusb_free_device_list($ahDevicesList)
    _libusb_exit()
EndFunc   ;==>_Test


Func _libusb_exit($hContext = 0)
    DllCall($g_hlibusb, "none", "libusb_exit", "ptr", $hContext)
    If @error Then Return SetError(1, 0, 0)
    Return 1
EndFunc   ;==>_libusb_exit

Func _libusb_free_device_list(ByRef $ahDevicesList, $iUnref_Devices = 1)
    If Not IsArray($ahDevicesList) Or Not UBound($ahDevicesList) Then Return SetError(1, 0, 0)
    Local $hDeviceList = (UBound($ahDevicesList, 2) = 4) ? $ahDevicesList[0][0] : $ahDevicesList[0]
    If Not $hDeviceList Then Return SetError(1, 0, 0)
    Local $aCall = DllCall($g_hlibusb, "none", "libusb_free_device_list", "ptr", $hDeviceList, "int", $iUnref_Devices)
    If @error Then Return SetError(1, 0, 0)
    Return 1
EndFunc   ;==>_libusb_free_device_list

Func _libusb_get_device_list($hContext = 0)
    Local $aCall = DllCall($g_hlibusb, "int", "libusb_get_device_list", "ptr", $hContext, "ptr*", 0)
    If @error Or Not $aCall[0] Then Return SetError(1, 0, 0)
    Local $tlibusb_device_list = DllStructCreate("ptr[" & $aCall[0] & "]", $aCall[2])
    Local $ahDevicesList[$aCall[0] + 1]

    $ahDevicesList[0] = $aCall[2] ;store libusb_device pointer
    For $i = 1 To $aCall[0]
        $ahDevicesList[$i] = DllStructGetData($tlibusb_device_list, 1, $i)
    Next
    Return $ahDevicesList
EndFunc   ;==>_libusb_get_device_list

Func _libusb_init($bNewhContext = False)
    If Not $g_hlibusb Then Return SetError(1, 0, -1)
    Local $sParamType = ($bNewhContext) ? "ptr*" : "ptr"
    Local $aCall = DllCall($g_hlibusb, "int", "libusb_init", $sParamType, 0)
    If @error Or Not $aCall[0] = $LIBUSB_SUCCESS Then Return SetError(1, 0, 0)
    Return $aCall[1]
EndFunc   ;==>_libusb_init

 

PD: I like your website. It's nice.

Saludos

Edited by Danyfirex
Added Free functions
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  • DevMode changed the title to [Solved] I need help dealing with a C++ DLL [ pointer to pointer ]

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