How to identify the window ID?

[Kevin_yeh2020]

Hello,

These are two different programs. I would like to use the program_A to check program_B is open or not? But I found that if I open a window_B.txt also passed inspection.
How to make Window_A check the AHK's Window_B only?

Program_A :

Code: Select all

IfWinNotExist, Window_B
{
MsgBox, 48,, Window_B is not opened
Exitapp
}

Program_B :

Code: Select all

Gui, Show, h90 w150, Window_B
Gui, Color, cBlack
Gui, Font, Norm S45 W900 cRed , Calibri
Gui, Add, Text, x6 y10, PASS
return
GuiClose:
ExitApp

[Rohwedder]

Hallo,
try:

Code: Select all

IfWinNotExist, Window_B ahk_class AutoHotkeyGUI
{
	MsgBox, 48,, Window_B is not opened
	Exitapp
}

[Marcosa1020]

Hallo,
try:

Code: Select all

IfWinNotExist, Window_B ahk_class AutoHotkeyGUI
{
	MsgBox, 48,, Window_B is not opened
	Exitapp
}

Hi Rohwedder,

Thanks.