I want to get the handle of every new Dialog which pops up from a specific application.
I understand I should set a hook with SetWinEventHook which is in user32.dll
Here's a very simple example that prints to the console the window text for each dialog that is opened:
import sys
import time
import ctypes
import ctypes.wintypes
EVENT_SYSTEM_DIALOGSTART = 0x0010
WINEVENT_OUTOFCONTEXT = 0x0000
user32 = ctypes.windll.user32
ole32 = ctypes.windll.ole32
ole32.CoInitialize(0)
WinEventProcType = ctypes.WINFUNCTYPE(
None,
ctypes.wintypes.HANDLE,
ctypes.wintypes.DWORD,
ctypes.wintypes.HWND,
ctypes.wintypes.LONG,
ctypes.wintypes.LONG,
ctypes.wintypes.DWORD,
ctypes.wintypes.DWORD
)
def callback(hWinEventHook, event, hwnd, idObject, idChild, dwEventThread, dwmsEventTime):
length = user32.GetWindowTextLengthA(hwnd)
buff = ctypes.create_string_buffer(length + 1)
user32.GetWindowTextA(hwnd, buff, length + 1)
print buff.value
WinEventProc = WinEventProcType(callback)
user32.SetWinEventHook.restype = ctypes.wintypes.HANDLE
hook = user32.SetWinEventHook(
EVENT_SYSTEM_DIALOGSTART,
EVENT_SYSTEM_DIALOGSTART,
0,
WinEventProc,
0,
0,
WINEVENT_OUTOFCONTEXT
)
if hook == 0:
print 'SetWinEventHook failed'
sys.exit(1)
msg = ctypes.wintypes.MSG()
while user32.GetMessageW(ctypes.byref(msg), 0, 0, 0) != 0:
user32.TranslateMessageW(msg)
user32.DispatchMessageW(msg)
user32.UnhookWinEvent(hook)
ole32.CoUninitialize()