Hola

Esto es un ejemplo de uso de SendMessage para enviar comandos a otras aplicaciones. Se necesita el Handle de la otra aplicación y un código que hace referencia a una acción o evento determinado. Los códigos se pueden encontrar usando la herramienta Spy++ incluida en VB y VB.Net

Este programita permite cambiar las vistas de los iconos del escritorio como si fuera un ListView y también cambia las vistas del Explorador de windows.  Es como hacer "clic" en 'Vistas' del Explorador de Windows pero se hace remotamente desde el programa.

Intrucciones:

- Crea un array con dos controles OptionButton, 5 de cada uno: Option1 y Option2

En un formulario meter esto:

Option Explicit
Private Declare Function SendMessage Lib "user32" Alias "SendMessageA" _
(ByVal hwnd As Long, _
ByVal wMsg As Long, _
ByVal wParam As Long, _
lParam As Any) As Long
 
Private Declare Function FindWindow Lib "user32" Alias "FindWindowA" _
(ByVal lpClassName As String, _
ByVal lpWindowName As String) As Long
 
Private Declare Function FindWindowEx Lib "user32" Alias "FindWindowExA" _
(ByVal hWnd1 As Long, _
ByVal hWnd2 As Long, _
ByVal lpsz1 As String, _
ByVal lpsz2 As String) As Long
 
Private Const WM_COMMAND = &H111
 
Private Sub Form_Load()
Option1.Item(0).Caption = "Vista Miniatura"
Option1.Item(1).Caption = "Mosaico"
Option1.Item(2).Caption = "Iconos"
Option1.Item(3).Caption = "Lista"
Option1.Item(4).Caption = "Detalle"
 
Option2.Item(0).Caption = "Vista Miniatura"
Option2.Item(1).Caption = "Mosaico"
Option2.Item(2).Caption = "Iconos"
Option2.Item(3).Caption = "Lista"
Option2.Item(4).Caption = "Detalle"
End Sub
 
Public Function VistasEscritorio(ByVal Code As Long)
Dim hwProgMan As Long
Dim hwDesktop As Long
hwProgMan = FindWindow("Progman", "Program Manager")
hwDesktop = FindWindowEx(hwProgMan, &H0, "SHELLDLL_DefView", vbNullString)
SendMessage hwDesktop, WM_COMMAND, Code, &H0
End Function
 
Public Function VistasExplorador(ByVal Code As Long)
Dim hwExplorer As Long
Dim ListView As Long
 
'Para XP
hwExplorer = FindWindow("ExploreWClass", vbNullString)
ListView = FindWindowEx(hwExplorer, &H0, "SHELLDLL_DefView", vbNullString)
SendMessage ListView, WM_COMMAND, Code, &H0
 
'Para Vista/...
hwExplorer = FindWindow("CabinetWClass", vbNullString)
ListView = FindWindowEx(hwExplorer, &H0, "ShellTabWindowClass", vbNullString)
SendMessage ListView, WM_COMMAND, Code, &H0
End Function
 
Private Sub Option1_Click(Index As Integer)
Dim Code As Long
Select Case Index
Case 0: Code = 28717 'Vista Miniatura
Case 1: Code = 28718 'Mosaico
Case 2: Code = 28713 'Iconos
Case 3: Code = 28715 'Lista
Case 4: Code = 28716 'Detalles
End Select
Call VistasEscritorio(Code)
End Sub
Private Sub Option2_Click(Index As Integer)
Dim Code As Long
Select Case Index
Case 0: Code = 28717 'Vista Miniatura
Case 1: Code = 28718 'Mosaico
Case 2: Code = 28713 'Iconos
Case 3: Code = 28715 'Lista
Case 4: Code = 28716 'Detalles
End Select
Call VistasExplorador(Code)
End Sub