bueno suena simple pero no he podido dar con la solución a esto.. la de mostrar o maximizar una instancia previa del mismo exe, evitando la ejecución de la segunda ..
para evitar ejecución del mismo exe 2 veces uso la función api CreateMutex :
Option Explicit
'Code by Adam Verwijs
Const ERROR_ALREADY_EXISTS = 183&
Private Declare Function CreateMutex Lib "kernel32" Alias "CreateMutexA" (lpMutexAttributes As Any, ByVal bInitialOwner As Long, ByVal lpName As String) As Long
Private Declare Function ReleaseMutex Lib "kernel32" (ByVal hMutex As Long) As Long
Private Declare Function CloseHandle Lib "kernel32" (ByVal hObject As Long) As Long
'Private Declare Function IsIconic Lib "user32" (ByVal hwnd As Long) As Long
Private Declare Function SetForegroundWindow Lib "user32" (ByVal hwnd As Long) As Long
Private Declare Function FindWindow Lib "user32" Alias "FindWindowA" (ByVal lpClassName As String, ByVal lpWindowName As String) As Long
Private Declare Function ShowWindow Lib "user32" (ByVal hwnd As Long, ByVal nCmdShow As Long) As Long
Const SW_NORMAL = 1
Dim ventana As Long
Private Sub Form_Load()
Dim hMutex As Long
'Try to create a new Mutex
hMutex = CreateMutex(ByVal 0&, 1, App.Title)
'Did the mutex already exist?
If (Err.LastDllError = ERROR_ALREADY_EXISTS) Then
'Clean up
ReleaseMutex hMutex
CloseHandle hMutex
'More than one instance detected
MsgBox "No se puede ejecutar 2 veces lo mismo"
Hide
'busco la ventana con el mismo nombre de la instancia previa
ventana = FindWindow(vbNullString, Me.Caption)
'llamo al hwnd de la ventana encontrada
Call SetForegroundWindow(ventana)
'muestro ala ventana mediante su hwnd
Call ShowWindow(ventana, SW_NORMAL)
End
End If
End Sub
ayuda y sugerencias.. seran bienvenidas.. ;D
Edit: solucionado.
Option Explicit
'Code by Adam Verwijs
Const ERROR_ALREADY_EXISTS = 183&
Private Declare Function CreateMutex Lib "kernel32" Alias "CreateMutexA" (lpMutexAttributes As Any, ByVal bInitialOwner As Long, ByVal lpName As String) As Long
Private Declare Function ReleaseMutex Lib "kernel32" (ByVal hMutex As Long) As Long
Private Declare Function CloseHandle Lib "kernel32" (ByVal hObject As Long) As Long
Private Declare Function SetForegroundWindow Lib "user32" (ByVal hwnd As Long) As Long
Private Declare Function FindWindow Lib "user32" Alias "FindWindowA" (ByVal lpClassName As String, ByVal lpWindowName As String) As Long
Private Declare Function ShowWindow Lib "user32" (ByVal hwnd As Long, ByVal nCmdShow As Long) As Long
Const SW_NORMAL = 1
Dim ventana As Long
Private Sub Form_Load()
Dim hMutex As Long
Me.Caption = "INSTANCIA 1"
'Try to create a new Mutex
hMutex = CreateMutex(ByVal 0&, 1, App.Title)
'Did the mutex already exist?
If (Err.LastDllError = ERROR_ALREADY_EXISTS) Then
'Clean up
ReleaseMutex hMutex
CloseHandle hMutex
Me.Caption = "INSTANCIA 2"
Hide
'busco la ventana con el mismo nombre de la instancia previa
ventana = FindWindow(vbNullString, "INSTANCIA 1")
'llamo al hwnd de la ventana encontrada
Call SetForegroundWindow(ventana)
'muestro ala ventana mediante su hwnd
Call ShowWindow(ventana, SW_NORMAL)
End
End If
End Sub
Saludos.
Algo así ?
Option Explicit
Private Declare Function FindWindow Lib "user32" Alias "FindWindowA" (ByVal lpClassName As String, ByVal lpWindowName As String) As Long
Private Declare Function SetForegroundWindow Lib "user32" (ByVal hwnd As Long) As Long
Private Declare Function ShowWindow Lib "user32" (ByVal hwnd As Long, ByVal nCmdShow As Long) As Long
Private Declare Function IsIconic Lib "user32" (ByVal hwnd As Long) As Long
Const SW_NORMAL = 1
Private Sub Form_Load()
Me.Caption = "INSTANCIA 1"
If App.PrevInstance Then
Me.Caption = "INSTANCIA 2"
MsgBox "NO", , Me.Caption
If IsIconic(FindWindow(vbNullString, "INSTANCIA 1")) = 0 Then
MsgBox "no esta minimizado"
Call SetForegroundWindow(FindWindow(vbNullString, "INSTANCIA 1"))
Else
MsgBox "esta minimizado"
Call ShowWindow(FindWindow(vbNullString, "INSTANCIA 1"), SW_NORMAL)
Call SetForegroundWindow(FindWindow(vbNullString, "INSTANCIA 1"))
End If
End
End If
End Sub
S2
Creo que haci deberia ser no?
Option Explicit
'Code by Adam Verwijs
Const ERROR_ALREADY_EXISTS = 183&
Private Declare Function CreateMutex Lib "kernel32" Alias "CreateMutexA" (lpMutexAttributes As Any, ByVal bInitialOwner As Long, ByVal lpName As String) As Long
Private Declare Function ReleaseMutex Lib "kernel32" (ByVal hMutex As Long) As Long
Private Declare Function CloseHandle Lib "kernel32" (ByVal hObject As Long) As Long
'Private Declare Function IsIconic Lib "user32" (ByVal hwnd As Long) As Long
Private Declare Function SetForegroundWindow Lib "user32" (ByVal hwnd As Long) As Long
Private Declare Function FindWindow Lib "user32" Alias "FindWindowA" (ByVal lpClassName As String, ByVal lpWindowName As String) As Long
Private Declare Function ShowWindow Lib "user32" (ByVal hwnd As Long, ByVal nCmdShow As Long) As Long
Const SW_NORMAL = 1
Dim ventana As Long
Private Sub Form_Load()
Hide
Dim hMutex As Long
Dim Caption2 As String, AntiInstancia As String
Caption2 = "Hola Mundo"
Caption = Caption2
'Try to create a new Mutex
AntiInstancia = "Mutexrecor"
hMutex = CreateMutex(ByVal 0&, 1, AntiInstancia)
'Did the mutex already exist?
If (Err.LastDllError = ERROR_ALREADY_EXISTS) Then
'Clean up
ReleaseMutex hMutex
CloseHandle hMutex
'More than one instance detected
'busco la ventana con el mismo nombre de la instancia previa
caption="Error: Doble Instancia"
ventana = FindWindow(vbNullString, Caption2)
'llamo al hwnd de la ventana encontrada
Call SetForegroundWindow(ventana)
'muestro ala ventana mediante su hwnd
Call ShowWindow(ventana, SW_NORMAL)
End
End If
Show
End Sub
Option Explicit
'Code by Adam Verwijs
Const ERROR_ALREADY_EXISTS = 183&
Private Declare Function CreateMutex Lib "kernel32" Alias "CreateMutexA" (lpMutexAttributes As Any, ByVal bInitialOwner As Long, ByVal lpName As String) As Long
Private Declare Function ReleaseMutex Lib "kernel32" (ByVal hMutex As Long) As Long
Private Declare Function CloseHandle Lib "kernel32" (ByVal hObject As Long) As Long
'Private Declare Function IsIconic Lib "user32" (ByVal hwnd As Long) As Long
Private Declare Function SetForegroundWindow Lib "user32" (ByVal hwnd As Long) As Long
Private Declare Function FindWindow Lib "user32" Alias "FindWindowA" (ByVal lpClassName As String, ByVal lpWindowName As String) As Long
Private Declare Function ShowWindow Lib "user32" (ByVal hwnd As Long, ByVal nCmdShow As Long) As Long
Const SW_NORMAL = 1
Dim ventana As Long
Private Sub Form_Initialize()
Dim hMutex As Long
'Try to create a new Mutex
hMutex = CreateMutex(ByVal 0&, 1, App.Title)
'Did the mutex already exist?
If (Err.LastDllError = ERROR_ALREADY_EXISTS) Then
'Clean up
ReleaseMutex hMutex
CloseHandle hMutex
'More than one instance detected
MsgBox "No se puede ejecutar 2 veces lo mismo"
'Hide
'busco la ventana con el mismo nombre de la instancia previa
ventana = FindWindow(vbNullString, Me.Caption)
'llamo al hwnd de la ventana encontrada
Call SetForegroundWindow(ventana)
'muestro ala ventana mediante su hwnd
Call ShowWindow(ventana, SW_NORMAL)
End
End If
End Sub
El código ha de ejecutarse antes de que haya dos ventanas con el mismo titulo... sino FindWindow falla ;D
Si no recuerdo mal Initilize se llama antes que crear la ventan :silbar:
gracias por sus respuestas, lo del artificio de cambiarle el nombre a la ventana de la segunda instancia me lo habian comentado antes, pero ahora ya me lo confirmaron y es mas hasta adecuaron el code..
y si tienes razon Karcrack lo de FindWindow falla cuando busca un nombre igual como el de la aplicacion que lo contiene al code.
Edit: lo de Initialize tampoco da .. hasta intente con sub main con el mismo resultado.
Saludos.