Because my Software uses ProgramParameter(0) to open files, I have to open the files only with the first instance of my Programm before I close the seceond instance!
Do do this, I need the handle of the already running Application.
The remark from http://www.developerfusion.co.uk/show/1716/5/ is important so I have to find another way...
Only for information my Code:
Please compile and call it with a Programm parameter.
Code: Select all
Declare PreviousInstance(title.s)
Declare WindowCallBack(hwnd, uMsg, wParam, lParam)
progtitle.s = "Run Once"
parameter.s = ProgramParameter(0)
previnsthdl = PreviousInstance(progtitle)
If previnsthdl
If parameter
send.COPYDATASTRUCT
send\cbData = Len(parameter)
send\lpData = @parameter
MessageRequester("","Already running! Send '" + parameter + "' to previous instance")
SendMessage_(previnsthdl,#WM_COPYDATA,hwnd,@send)
Else
MessageRequester("","Already running")
EndIf
ShowWindow_(previnsthdl,#SW_RESTORE)
SetForegroundWindow_(previnsthdl)
End
EndIf
If OpenWindow(0,0,0,300,280,progtitle + FormatDate(" %hh:%mm:%ss",Date()),#PB_Window_SystemMenu | #PB_Window_TitleBar | #PB_Window_ScreenCentered )
SetWindowCallback(@WindowCallBack(),0)
Repeat
Event=WaitWindowEvent()
Until Event = #PB_Event_CloseWindow
EndIf
Procedure WindowCallBack(hwnd, uMsg, wParam, lParam)
result = #PB_ProcessPureBasicEvents
Select uMsg
Case #WM_COPYDATA
*recv.COPYDATASTRUCT = Lparam
MessageRequester("Parameter from second Instance ",PeekS(*recv\lpData,*recv\cbData))
EndSelect
ProcedureReturn result
EndProcedure
Procedure.l PreviousInstance(title.s)
Hwnd = FindWindow_( 0, 0 )
l = Len(title)
While Hwnd <> 0
txt.s = Space(256)
GetWindowText_(Hwnd, txt, 256)
If Left(txt,l) = title
ProcedureReturn Hwnd
EndIf
Hwnd = GetWindow_(Hwnd, #GW_HWNDNEXT)
Wend
ProcedureReturn #False
EndProcedure
