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Catching WM_INPUT - hWnd not being set

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IErrors

I am working on some functionality to detect whether a standard keyboard was used for input in my UI or if a barcode scanner (that acts like a keyboard) was used. Instead of dealing with a scanner SDK, I decided I would read from the raw input to get device info and make a determination.

I discovered while testing with multiple UIs is that when the WM_INPUT message is received and the function called, the $hWnd param is always the same (apparently whatever handle I set the "hTarget" to in the RAWINPUTDEVICE struct).

Is this normal behavior??

Using the test code below, no matter what window you give input to the $hWnd param never changes.

#include <WindowsConstants.au3>
#include <GUIConstantsEx.au3>
#include <WinAPISys.au3>

$Form1 = GUICreate("Form 1", 300, 300, -1, 10)
ConsoleWrite("$Form1 = " & $Form1 & @CRLF)
$Edit1 = GUICtrlCreateEdit("", 0, 0, 300, 300)
GUISetState(@SW_SHOW, $Form1)

$Form2 = GUICreate("Form 2", 300, 300, -1, 350)
ConsoleWrite("$Form2 = " & $Form2 & @CRLF)
$Edit2 = GUICtrlCreateEdit("", 0, 0, 300, 300)
GUISetState(@SW_SHOW, $Form2)

GUIRegisterMsg($WM_INPUT, "WM_INPUT")          ; https://msdn.microsoft.com/en-us/library/ms645590(v=vs.85).aspx

$tRID = DllStructCreate($tagRAWINPUTDEVICE)    ; https://msdn.microsoft.com/en-us/library/ms645565(v=vs.85).aspx
DllStructSetData($tRID, "UsagePage", 1)
DllStructSetData($tRID, "Usage", 6)
DllStructSetData($tRID, "Flags", 0)
DllStructSetData($tRID, "hTarget", $Form1)     ; According to the struct def, if hTarget=NULL then it should follow keyboard focus. - nope :(

$pRID = DllStructGetPtr($tRID)
_WinAPI_RegisterRawInputDevices($pRID)         ; https://msdn.microsoft.com/en-us/library/ms645600(v=vs.85).aspx

Do
Until GUIGetMsg() = $GUI_EVENT_CLOSE

Func WM_INPUT($hWnd, $iMsg, $wParam, $lParam)
  ConsoleWrite("hWnd = " & $hWnd & " | Title = " & WinGetTitle($hWnd) & @CRLF)
  ConsoleWrite("Active Window = " & WinGetTitle("[ACTIVE]") & @CRLF)
    Return $GUI_RUNDEFMSG
EndFunc   ;==>WM_INPUT

 

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mikell
47 minutes ago, IErrors said:

I would read from the raw input to get device info and make a determination.

So... _WinAPI_GetRawInputDeviceInfo   ?  :)

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IErrors
Just now, mikell said:

Of course! That's how I am doing it and it works just fine! - Thanks.

I was wondering if the $hWnd param of the WM_INPUT message handler should reflect the actual window handle the message was received in, because it stays the same no matter what form I type in. :(

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mikell

Wrong way IMHO to get the window handle. The $hWnd param will always return the registered hTarget value

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LarsJ

IErrors, Yes, this is normal behaviour. $hWnd param of the WM_INPUT message reflects the window handle the message is send to. As mikell has already explained. Your WM_INPUT message handler should look like this:

Func WM_INPUT($hWnd, $iMsg, $wParam, $lParam)
  If $hWnd = WinGetHandle("[ACTIVE]") Then
    ConsoleWrite("hWnd = " & $hWnd & " | Title = " & WinGetTitle($hWnd) & @CRLF)
    ConsoleWrite("Active Window = " & WinGetTitle("[ACTIVE]") & @CRLF)
  EndIf
  Return $GUI_RUNDEFMSG
EndFunc   ;==>WM_INPUT

 

GUIRegisterMsg is able to catch messages which are send to a GUI. If you set the value of hTarget parameter to null, the WM_INPUT messages are send directly to the control which has the keybord focus. In this case either $Edit1 or $Edit2. To catch these messages you have to use subclassing in this way:

#include <WindowsConstants.au3>
#include <GUIConstantsEx.au3>
#include <WinAPIShellEx.au3>
#include <WinAPISys.au3>

$Form1 = GUICreate("Form 1", 300, 300, -1, 10)
ConsoleWrite("$Form1 = " & $Form1 & @CRLF)
$Edit1 = GUICtrlCreateEdit("", 0, 0, 300, 300)
$hEdit1 = GUICtrlGetHandle( $Edit1 )
GUISetState(@SW_SHOW, $Form1)

$pEdit1Callback = DllCallbackGetPtr( DllCallbackRegister( "Edit1Callback", "lresult", "hwnd;uint;wparam;lparam;uint_ptr;dword_ptr" ) )
_WinAPI_SetWindowSubclass( $hEdit1, $pEdit1Callback, 9999, 0 )

$Form2 = GUICreate("Form 2", 300, 300, -1, 350)
ConsoleWrite("$Form2 = " & $Form2 & @CRLF)
$Edit2 = GUICtrlCreateEdit("", 0, 0, 300, 300)
$hEdit2 = GUICtrlGetHandle( $Edit2 )
GUISetState(@SW_SHOW, $Form2)

$pEdit2Callback = DllCallbackGetPtr( DllCallbackRegister( "Edit2Callback", "lresult", "hwnd;uint;wparam;lparam;uint_ptr;dword_ptr" ) )
_WinAPI_SetWindowSubclass( $hEdit2, $pEdit2Callback, 9998, 0 )

GUIRegisterMsg($WM_INPUT, "WM_INPUT")          ; https://msdn.microsoft.com/en-us/library/ms645590(v=vs.85).aspx

$tRID = DllStructCreate($tagRAWINPUTDEVICE)    ; https://msdn.microsoft.com/en-us/library/ms645565(v=vs.85).aspx
DllStructSetData($tRID, "UsagePage", 1)
DllStructSetData($tRID, "Usage", 6)
DllStructSetData($tRID, "Flags", 0)
;DllStructSetData($tRID, "hTarget", $Form1)     ; According to the struct def, if hTarget=NULL then it should follow keyboard focus. - nope :(
DllStructSetData($tRID, "hTarget", 0)          ; It indeed does follow keyboard focus

$pRID = DllStructGetPtr($tRID)
_WinAPI_RegisterRawInputDevices($pRID)         ; https://msdn.microsoft.com/en-us/library/ms645600(v=vs.85).aspx

Do
Until GUIGetMsg() = $GUI_EVENT_CLOSE

_WinAPI_RemoveWindowSubclass( $Edit1, $pEdit1Callback, 9999 )
_WinAPI_RemoveWindowSubclass( $Edit2, $pEdit2Callback, 9998 )

Func WM_INPUT($hWnd, $iMsg, $wParam, $lParam)
  If $hWnd = WinGetHandle("[ACTIVE]") Then
    ConsoleWrite("hWnd = " & $hWnd & " | Title = " & WinGetTitle($hWnd) & @CRLF)
    ConsoleWrite("Active Window = " & WinGetTitle("[ACTIVE]") & @CRLF)
  EndIf
  Return $GUI_RUNDEFMSG
EndFunc   ;==>WM_INPUT

Func Edit1Callback( $hWnd, $iMsg, $wParam, $lParam, $iSubclassId, $pData )
  Switch $iMsg
    Case $WM_INPUT
      ConsoleWrite("Edit1Callback" & @CRLF)
      ConsoleWrite("    hWnd = " & $hWnd & " | Title = " & WinGetTitle($hWnd) & @CRLF)
      ConsoleWrite("    Active Window = " & WinGetTitle("[ACTIVE]") & @CRLF)
  EndSwitch

  ; Call next function in subclass chain
  Return DllCall( "comctl32.dll", "lresult", "DefSubclassProc", "hwnd", $hWnd, "uint", $iMsg, "wparam", $wParam, "lparam", $lParam )[0]
  #forceref $iSubclassId, $pData
EndFunc

Func Edit2Callback( $hWnd, $iMsg, $wParam, $lParam, $iSubclassId, $pData )
  Switch $iMsg
    Case $WM_INPUT
      ConsoleWrite("Edit2Callback" & @CRLF)
      ConsoleWrite("    hWnd = " & $hWnd & " | Title = " & WinGetTitle($hWnd) & @CRLF)
      ConsoleWrite("    Active Window = " & WinGetTitle("[ACTIVE]") & @CRLF)
  EndSwitch

  ; Call next function in subclass chain
  Return DllCall( "comctl32.dll", "lresult", "DefSubclassProc", "hwnd", $hWnd, "uint", $iMsg, "wparam", $wParam, "lparam", $lParam )[0]
  #forceref $iSubclassId, $pData
EndFunc

 

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IErrors

Thank you both Mikell & LarsJ!

I figured it had to do with the registered hTarget, but I wanted to make sure I wasn't doing it wrong.

I was able to get the active window and control handle in the message handler of my actual code - although very fumbly.

I hadn't thought of creating individual callbacks for each control - This is a great! Thank you for demonstrating the correct way of doing this.

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      1. From a bit of testing It seems AutoIt won't overflow a DllStruct?
      2. Are strings passed through DLL call guaranteed to be 'an ANSI string (a minimum of 65536 chars is allocated)' as the Helpfile clearly states?
      #include <Array.au3> #include <WinAPI.au3> Example() Func Example() Local $aWindows = _WinAPI_EnumWindows() Local $aResult[$aWindows[0][0]][6] For $i = 1 To $aWindows[0][0] $aResult[$i - 1][0] = "0x" & Hex($aWindows[$i][0], 8) $aResult[$i - 1][1] = $aWindows[$i][1] $aResult[$i - 1][2] = WinGetTitle($aWindows[$i][0]) $aResult[$i - 1][3] = WinGetText($aWindows[$i][0]) $aResult[$i - 1][4] = WinGetProcess($aWindows[$i][0]) $aResult[$i - 1][5] = _ArrayToString(EnumProps($aWindows[$i][0]), ", ", 1) Next _ArrayDisplay($aResult, "_WinAPI_EnumWindows", Default, Default, Default, "Handle|Class|Title|Text|Process|Properties") EndFunc ;==>Example Func EnumProps($hWnd, $vDLL = 'user32.dll') ; Create callback function. Local $iErr = 0 Local $aProps[1] = [0] Local $hCb = DllCallbackRegister('_PropEnumProcEx', 'int', 'hwnd;ptr;handle;ptr') ; Call EnumPropsEx Local $aRet = DllCall($vDLL, 'int', 'EnumPropsEx', 'HWND', $hWnd, 'ptr', DllCallbackGetPtr($hCb), 'str', "") If @error Or Not $aRet[0] Then $iErr = @error ConsoleWrite("EnumProps Error:" & $iErr & @CRLF) ElseIf $aRet[3] <> "" Then $aProps = StringSplit($aRet[3], ";") EndIf DllCallbackFree($hCb) Return SetError($iErr, 0, $aProps) EndFunc ;==>EnumProps Func _PropEnumProcEx($hWnd, $sProp, $hData, $pStr) Local $iSzStr = _WinAPI_StringLenA($sProp) + 1 ; + Null Char If $iSzStr > 1 Then Local $tProp = DllStructCreate('char[' & $iSzStr & ']', $sProp) Local $tRetn = DllStructCreate('char[65535]', $pStr) DllStructSetData($tRetn, 1, DllStructGetData($tRetn, 1) & DllStructGetData($tProp, 1) & ";") EndIf Return 1 EndFunc ;==>_PropEnumProcEx ;-------------------------------------------------------------------------------------------------------------- Func EnumProps2($hWnd, $iSzBuffer = 4096, $vDLL = 'user32.dll') ; Create callback function. Local $iErr = 0 Local $sProps Local $aProps[1] = [0] Local $hCb = DllCallbackRegister('_PropEnumProcEx', 'int', 'hwnd;ptr;handle;ptr') Local $tProps = DllStructCreate('int;int;char[' & $iSzBuffer & ']') DllStructSetData($tProps, 1, $iSzBuffer) ;BufferSz DllStructSetData($tProps, 2, $iSzBuffer) ;BufferRemaining ; Call EnumPropsEx Local $aRet = DllCall($vDLL, 'int', 'EnumPropsEx', 'HWND', $hWnd, 'ptr', DllCallbackGetPtr($hCb), 'ptr', DllStructGetPtr($tProps)) If @error Or Not $aRet[0] Then $iErr = @error DllStructSetData($tProps, 2, 0) EndIf DllCallbackFree($hCb) $sProps = DllStructGetData($tProps, 3) If DllStructGetData($tProps, 2) > 0 Then If $sProps <> "" Then $aProps = StringSplit(StringTrimRight($sProps, 1), ";") EndIf Else If Not $iErr Then $iErr = 6 ;buffer overflow Return SetError($iErr, -DllStructGetData($tProps, 2), $aProps) EndIf Return $aProps EndFunc ;==>EnumProps2 Func _PropEnumProcEx2($hWnd, $sProp, $hData, $ptProp) Local $iSzStr = _WinAPI_StringLenA($sProp) + 1 Local $tProp = DllStructCreate('char[' & $iSzStr & ']', $sProp) If $iSzStr > 1 Then Local $sRet = DllStructGetData($tProp, 1) Local $iSzBuffer = DllStructGetData(DllStructCreate('int', $ptProp), 1) Local $tRetn = DllStructCreate('int;int;char[' & $iSzBuffer & ']', $ptProp) DllStructSetData($tRetn, 2, DllStructGetData($tRetn, 2) - $iSzStr) If DllStructGetData($tRetn, 2) > 0 Then DllStructSetData($tRetn, 3, DllStructGetData($tRetn, 3) & $sRet & ";") EndIf EndIf Return 1 EndFunc ;==>_PropEnumProcEx2  
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