# Function Reference

# _WinAPI_GetWindowLong

Retrieves information about the specified window

#include <WinAPISysWin.au3>
_WinAPI_GetWindowLong ( $hWnd, $iIndex )

## Parameters

$hWnd | Handle of the window
$iIndex | Specifies the 0-based offset to the value to be retrieved. Valid values are in the range zero through the number of bytes of extra window memory, minus four; for example, if you specified 12 or more bytes of extra memory, a value of 8 would be an index to the third 32 bit integer. To retrieve any other value, specify one of the following values: $GWL_EXSTYLE - Retrieves the extended window styles $GWL_STYLE - Retrieves the window styles $GWL_WNDPROC - Retrieves the address of the window procedure $GWL_HINSTANCE - Retrieves the handle of the application instance $GWL_HWNDPARENT - Retrieves the handle of the parent window, if any $GWL_ID - Retrieves the identifier of the window $GWL_USERDATA - Retrieves the 32-bit value associated with the window

## Return Value

Success: | the requested value.
Failure: | sets the @error flag to non-zero, call _WinAPI_GetLastError() to get extended error information.

## Remarks

Above constants require #include <Constants.au3>

## Related

_WinAPI_SetWindowLong

## See Also

Search GetWindowLongPtr in MSDN Library.