Opened 6 years ago

Closed 6 years ago

Last modified 6 years ago

#3582 closed Bug (Fixed)

Bug in _WinAPI_GetGUIThreadInfo with caret rectangle

Reported by: linton.miller@… Owned by: Jon
Milestone: Component: AutoIt
Version: Severity: None
Keywords: Cc:


The _WinAPI_GetGUIThreadInfo does not return correct information for the caret bounding rectangle, in elements 7-10 of the return array. That can be observed using the demo program from the help documentation for _WinAPI_GetGUIThreadInfo, or the following block

#include <WinAPISys.au3>
Local $iPID
Local $aInfo[11]
$aInfo = _WinAPI_GetGUIThreadInfo(_WinAPI_GetWindowThreadProcessId(WinGetHandle('[ACTIVE]'), $iPID))
MsgBox(0, "_WinAPI_GetGUIThreadInfo Bug", _
       "Active window caret: "&$ainfo[7]&" "&$ainfo[8]&" "&$ainfo[9]&" "&$ainfo[10] & @CRLF & _
       "Caret window "&$ainfo[6]&" incorrectly equals caret x pos "&$ainfo[7])

The bug is a straightforward error in the UDF, referencing the wrong element of the DLL return struct.

	For $i = 1 To 4
		$aResult[6 + $i] = DllStructGetData($tGTI, 6 + 2, $i) ;<-- Second arg should be element 9, not 8

Also noted, for strict compliance, the $tagGUITHREADINFO DLLStruct should be properly declared with struct to ensure alignment of the rcCaret rect.

While a slightly more verbose DLLStruct definition, spelling out each of the rect members results in simpler code to copy the data out of the struct (and solves the bug by simply getting rid of the need for the loop with the buggy reference).

Func _WinAPI_GetGUIThreadInfo($iThreadId)
    Local Const $tagGUITHREADINFO = 'dword Size;dword Flags;hwnd hWndActive;hwnd hWndFocus;hwnd hWndCapture;hwnd hWndMenuOwner;hwnd hWndMoveSize;hwnd hWndCaret;struct rcCaret;long left;long top;long right;long bottom;endstruct'
	Local $tGTI = DllStructCreate($tagGUITHREADINFO)
	DllStructSetData($tGTI, 1, DllStructGetSize($tGTI))

	Local $aRet = DllCall('user32.dll', 'bool', 'GetGUIThreadInfo', 'dword', $iThreadId, 'struct*', $tGTI)
	If @error Or Not $aRet[0] Then Return SetError(@error + 10, @extended, 0)

	Local $aResult[11]
	For $i = 0 To 10
		$aResult[$i] = DllStructGetData($tGTI, $i + 2)
	For $i = 9 To 10
		$aResult[$i] -= $aResult[$i - 2]
	Return $aResult
EndFunc   ;==>_WinAPI_GetGUIThreadInfo

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Change History (2)

comment:1 Changed 6 years ago by Jpm

  • Milestone set to
  • Owner set to Jpm
  • Resolution set to Fixed
  • Status changed from new to closed

Fixed by revision [11941] in version:

comment:2 Changed 6 years ago by Jon

  • Milestone changed from to
  • Owner changed from Jpm to Jon

Fixed by revision [11942] in version:

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as closed The owner will remain Jon.

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