DllCallbackRegister? D:

[Steurendo]

I want to learn how i use DllCallbackRegister and what is its utility.. I didn't find any easy examples to learn. Can anyone post an easy example of this function? Thanks

[Danyfirex]

search in the forum you wil find a lot of good examples.

look:

expandcollapse popup

#include <winapi.au3>
#include <guitooltip.au3>
#include <WindowsConstants.au3>
$hTool = _WinAPI_CreateWindowEx($WS_EX_TOPMOST, "tooltips_class32", 0, BitOR($TTS_ALWAYSTIP, $TTS_NOPREFIX, $TTS_BALLOON), 0, 0, 0, 0, 0)
_GUIToolTip_AddTool($hTool, 0, "CPU Info:", 0, 0, 0, 0, 0, 16 + 128, 0) ; 16 = TTF_TRACK, 128 = TTF_PARSELINKS
_GUIToolTip_TrackActivate($hTool)
_GUIToolTip_SetTitle($hTool, "CPU Info:", 1)

$m_callback = DllCallbackRegister("_mover", "long", "int;wparam;lparam")
$pm_callback = DllCallbackGetPtr($m_callback)
$hook = _WinAPI_SetWindowsHookEx($WH_MOUSE_LL, $pm_callback, _WinAPI_GetModuleHandle(0))

While 1
sleep(1000)
WEnd

Func OnAutoItExit()
_WinAPI_UnhookWindowsHookEx($hook)
DllCallbackFree($m_callback)
_WinAPI_DestroyWindow($hTool)
EndFunc

Exit

Func _mover($nCode, $wparam, $lparam)
If $nCode<0 Then Return _WinAPI_CallNextHookEx($hook, $nCode, $wparam, $lparam)
ConsoleWrite("jk" & @CRLF)
Switch Number($wparam)
Case $WM_MOUSEMOVE
Local $pos = DllStructCreate("long;long", $lparam)
;MsgBox(0,"","test")
$x = DllStructGetData($pos, 1)
$y = DllStructGetData($pos, 2)
_GUIToolTip_TrackPosition($hTool, $x+25, $y+15)
_GUIToolTip_UpdateTipText($hTool, 0, 0, "Pos: " & $x & " x " & $y)
EndSwitch

Return _WinAPI_CallNextHookEx($hook, $nCode, $wparam, $lparam)
EndFunc

from help file.

; Create callback function
Local $handle = DllCallbackRegister("_EnumWindowsProc", "int", "hwnd;lparam")

; Call EnumWindows
DllCall("user32.dll", "int", "EnumWindows", "ptr", DllCallbackGetPtr($handle), "lparam", 10)

; Delete callback function
DllCallbackFree($handle)

; Callback Procedure
Func _EnumWindowsProc($hWnd, $lParam)
If WinGetTitle($hWnd) <> "" And BitAND(WinGetState($hWnd), 2) Then
Local $res = MsgBox(1, WinGetTitle($hWnd), "$hWnd=" & $hWnd & @CRLF & "lParam=" & $lParam & @CRLF & "$hWnd(type)=" & VarGetType($hWnd))
If $res = 2 Then Return 0 ; Cancel clicked, return 0 to stop enumeration
EndIf
Return 1 ; Return 1 to continue enumeration
EndFunc ;==>_EnumWindowsProc

regards

Edited January 4, 2013 by Danyfirex

[Steurendo]

Sorry but I have not figured yet how the function works : Can someone explain me the concept?

[trancexx]

Sorry but I have not figured yet how the function works : Can someone explain me the concept?

When you call DllCallbackRegister then AutoIt performs "just in time" compilation (aka JIT) and gives you back the handle that you can use to get pointer to compiled code.

Other functions that make use of the callback functions will ask you for that pointer and will redirect execution to your callback code as defined by their documentation.

For example see documentation for EnumWindows function (Danyfirex's second and help file example) .

Edited January 4, 2013 by trancexx

[JohnOne]