Having only one instance of App, bring window to top

This will not only detect the window, but will bring it forward, making it the active window. this way the user does not have to look at the task bar.

SET CLASSLIB TO "standards" ADDITIVE
objCheckRun = createobject("checkrun")
if type('objCheckRun') = 'O'
objCheckRun.windowname = "your app window name"
if objCheckRun.checkrun()
release objCheckRun
quit
endif
endif
release classlib "standards"


this code is in a class method or it could be a procedure in main.
local WindowName
WindowName = this.windowname

#define GW_OWNER 4
#DEFINE GW_HWNDFIRST 0
#DEFINE GW_HWNDNEXT 2
declare integer SetForegroundWindow in win32api long lnhWnd
declare integer GetWindowText in win32api integer, string, integer
declare integer GetWindow in win32api integer,INTEGER
declare integer IsWindowVisible in win32api integer
declare integer GetActiveWindow in win32api
IsWindEx = .F.
if len(WindowName) < 1
return IsWindEx
endif
foxhwnd = GetActiveWindow() && get the window handle of this window
hwndNext = GetWindow(foxhwnd,GW_HWNDFIRST) && get the handel of the first window

**** loop thru each window to search the title
DO WHILE hwndNext <> 0
*** if window is not the foxpro handle and not a child window
IF (hwndnext <> foxhwnd .AND. GetWindow(hwndnext,GW_OWNER) = 0)

Stuffer = SPACE(64)
x = GetWindowText(hwndnext,@Stuffer,64) && get the window text
*** check to see if this is the specified window.
IF WindowName $ Stuffer
IsWindEx = .T.
=SetForegroundWindow(hwndnext) && BRING WINDOW TO FRONT
EXIT
ENDIF
ENDIF
hwndNext = GetWindow(hwndnext,GW_HWNDNEXT)
ENDDO
RETURN IsWindEx