If I know the "title" of an open window of an application running on the
same PC that my application is installed, say for example "Window abc",
what's the best method of getting my vb.net to "switch" to that window as if
I'd clicked on the taskbar or pressed ALT+TAB?
It should be simple, but I've had no luck so far ..
Thanks,
JC
8  4090 
On Thu, 23 Sep 2004 00:31:53 +0200, Arne Janning wrote: "John Clark" <jo**@johnNOTHI SBITclark.me.uk > schrieb If I know the "title" of an open window of an application running on the
same PC that my application is installed, say for example "Window abc",
what's the best method of getting my vb.net to "switch" to that window as
if I'd clicked on the taskbar or pressed ALT+TAB?
It should be simple, but I've had no luck so far ..
Hi John,
get a handle of the window using Win32-API FindWindow
http://www.pinvoke.net/default.aspx/user32.FindWindow
and bring it to front using
http://www.pinvoke.net/default.aspx/...regroundWindow
or BringWindowToTo p
http://www.pinvoke.net/default.aspx/...ingWindowToTop
Cheers
Arne Janning
Actually, to make SetForegroundWi ndow work reliably, you'll also need to
use GetWindowThread ProcessId and AttachThreadInp ut as well...
findwindow 'get the window handle
getwindowthread processid 'get the thread handle for the window
attachthreadinp ut ' attach to it's input queue
setforgroundwin dow ' set it to the foreground
attachthreadinp ut ' detach from thread's input queue
This is because of changes made to the way SetForegroundWi ndow works in
Win98/Win2k and greater. The idea was to keep applications from stealing
the focus....
According to msdn SetForegroundWi ndow only works if one of the following is
true:
The process is the foreground process.
The process was started by the foreground process.
The process received the last input event.
There is no foreground process.
The foreground process is being debugged.
The foreground is not locked (see LockSetForegrou ndWindow).
The foreground lock time-out has expired (see SPI_GETFOREGROU NDLOCKTIMEOUT
in SystemParameter sInfo).
Windows 2000/XP: No menus are active.
Using the above sequence seems to circumvent these restrictions and forces
the window to the top...
--
Tom Shelton [MVP]
"Tom Shelton" schrieb According to msdn SetForegroundWi ndow only works if one of the following
is
true:
The process is the foreground process.
The process was started by the foreground process.
The process received the last input event.
There is no foreground process.
The foreground process is being debugged.
The foreground is not locked (see LockSetForegrou ndWindow).
The foreground lock time-out has expired (see SPI_GETFOREGROU NDLOCKTIMEOUT
in SystemParameter sInfo).
Windows 2000/XP: No menus are active.
Using the above sequence seems to circumvent these restrictions and forces
the window to the top...
Hi Tom,
thanks for the feedback. You are right, of course, but I don't know if it
helps John.
As I couldn't find a working implementation in VB.NET on groups.google.c om
or somewhere else on the net here is some code that worked for me and might
work for John as well:
Private Declare Function GetForegroundWi ndow _
Lib "user32" () As IntPtr
Private Declare Function SetForegroundWi ndow _
Lib "user32" (ByVal hWnd As IntPtr) As Boolean
Private Declare Function GetWindowThread ProcessId _
Lib "user32" (ByVal hWnd As IntPtr, _
ByVal lpdwProcessId As IntPtr) As Integer
Private Declare Function AttachThreadInp ut _
Lib "user32" (ByVal idAttach As Integer, _
ByVal idAttachTo As Integer, ByVal fAttach As Boolean _
) As Boolean
Private Declare Function FindWindow _
Lib "user32" Alias "FindWindow A" (ByVal lpClassName As String, _
ByVal lpWindowName As String) As IntPtr
Private Sub Button1_Click( _
ByVal sender As System.Object, _
ByVal e As System.EventArg s) _
Handles Button1.Click
Dim hwndApp As IntPtr
Dim hwndForeground As IntPtr
Dim ThreadForegroun d As Integer
hwndApp = FindWindow("Not epad", "Untitled - Notepad")
If Not hwndApp.Equals( IntPtr.Zero) AndAlso _
Not hwndApp.Equals( GetForegroundWi ndow) Then
ThreadForegroun d = GetWindowThread ProcessId(hwndF oreground,
IntPtr.Zero)
AttachThreadInp ut(ThreadForegr ound, 0, True)
SetForegroundWi ndow(hwndApp)
AttachThreadInp ut(ThreadForegr ound, 0, False)
End If
End Sub
One may have to use Spy++ to get more details about the window that shall be
set to the foreground.
Cheers
Arne Janning
On Thu, 23 Sep 2004 02:57:07 +0200, Arne Janning wrote: "Tom Shelton" schrieb According to msdn SetForegroundWi ndow only works if one of the following
is
true:
The process is the foreground process.
The process was started by the foreground process.
The process received the last input event.
There is no foreground process.
The foreground process is being debugged.
The foreground is not locked (see LockSetForegrou ndWindow).
The foreground lock time-out has expired (see SPI_GETFOREGROU NDLOCKTIMEOUT
in SystemParameter sInfo).
Windows 2000/XP: No menus are active.
Using the above sequence seems to circumvent these restrictions and forces
the window to the top...
Hi Tom,
thanks for the feedback. You are right, of course, but I don't know if it
helps John.
As I couldn't find a working implementation in VB.NET on groups.google.c om
or somewhere else on the net here is some code that worked for me and might
work for John as well:
Private Declare Function GetForegroundWi ndow _
Lib "user32" () As IntPtr
Private Declare Function SetForegroundWi ndow _
Lib "user32" (ByVal hWnd As IntPtr) As Boolean
Private Declare Function GetWindowThread ProcessId _
Lib "user32" (ByVal hWnd As IntPtr, _
ByVal lpdwProcessId As IntPtr) As Integer
Private Declare Function AttachThreadInp ut _
Lib "user32" (ByVal idAttach As Integer, _
ByVal idAttachTo As Integer, ByVal fAttach As Boolean _
) As Boolean
Private Declare Function FindWindow _
Lib "user32" Alias "FindWindow A" (ByVal lpClassName As String, _
ByVal lpWindowName As String) As IntPtr
Private Sub Button1_Click( _
ByVal sender As System.Object, _
ByVal e As System.EventArg s) _
Handles Button1.Click
Dim hwndApp As IntPtr
Dim hwndForeground As IntPtr
Dim ThreadForegroun d As Integer
hwndApp = FindWindow("Not epad", "Untitled - Notepad")
If Not hwndApp.Equals( IntPtr.Zero) AndAlso _
Not hwndApp.Equals( GetForegroundWi ndow) Then
ThreadForegroun d = GetWindowThread ProcessId(hwndF oreground,
IntPtr.Zero)
AttachThreadInp ut(ThreadForegr ound, 0, True)
SetForegroundWi ndow(hwndApp)
AttachThreadInp ut(ThreadForegr ound, 0, False)
End If
End Sub
One may have to use Spy++ to get more details about the window that shall be
set to the foreground.
Cheers
Arne Janning
Good example Arne...
--
Tom Shelton [MVP]
"Tom Shelton" schrieb According to msdn SetForegroundWi ndow only works if one of the following
is
true:
The process is the foreground process.
The process was started by the foreground process.
The process received the last input event.
There is no foreground process.
The foreground process is being debugged.
The foreground is not locked (see LockSetForegrou ndWindow).
The foreground lock time-out has expired (see SPI_GETFOREGROU NDLOCKTIMEOUT
in SystemParameter sInfo).
Windows 2000/XP: No menus are active.
Using the above sequence seems to circumvent these restrictions and forces
the window to the top...
Hi Tom,
thanks for the feedback. You are right, of course, but I don't know if it
helps John.
As I couldn't find a working implementation in VB.NET on groups.google.c om
or somewhere else on the net here is some code that worked for me and might
work for John as well:
Private Declare Function GetForegroundWi ndow _
Lib "user32" () As IntPtr
Private Declare Function SetForegroundWi ndow _
Lib "user32" (ByVal hWnd As IntPtr) As Boolean
Private Declare Function GetWindowThread ProcessId _
Lib "user32" (ByVal hWnd As IntPtr, _
ByVal lpdwProcessId As IntPtr) As Integer
Private Declare Function AttachThreadInp ut _
Lib "user32" (ByVal idAttach As Integer, _
ByVal idAttachTo As Integer, ByVal fAttach As Boolean _
) As Boolean
Private Declare Function FindWindow _
Lib "user32" Alias "FindWindow A" (ByVal lpClassName As String, _
ByVal lpWindowName As String) As IntPtr
Private Sub Button1_Click( _
ByVal sender As System.Object, _
ByVal e As System.EventArg s) _
Handles Button1.Click
Dim hwndApp As IntPtr
Dim hwndForeground As IntPtr
Dim ThreadForegroun d As Integer
hwndApp = FindWindow("Not epad", "Untitled - Notepad")
If Not hwndApp.Equals( IntPtr.Zero) AndAlso _
Not hwndApp.Equals( GetForegroundWi ndow) Then
ThreadForegroun d = GetWindowThread ProcessId(hwndF oreground,
IntPtr.Zero)
AttachThreadInp ut(ThreadForegr ound, 0, True)
SetForegroundWi ndow(hwndApp)
AttachThreadInp ut(ThreadForegr ound, 0, False)
End If
End Sub
One may have to use Spy++ to get more details about the window that shall be
set to the foreground.
Cheers
Arne Janning
On Thu, 23 Sep 2004 02:57:07 +0200, Arne Janning wrote: "Tom Shelton" schrieb According to msdn SetForegroundWi ndow only works if one of the following
is
true:
The process is the foreground process.
The process was started by the foreground process.
The process received the last input event.
There is no foreground process.
The foreground process is being debugged.
The foreground is not locked (see LockSetForegrou ndWindow).
The foreground lock time-out has expired (see SPI_GETFOREGROU NDLOCKTIMEOUT
in SystemParameter sInfo).
Windows 2000/XP: No menus are active.
Using the above sequence seems to circumvent these restrictions and forces
the window to the top...
Hi Tom,
thanks for the feedback. You are right, of course, but I don't know if it
helps John.
As I couldn't find a working implementation in VB.NET on groups.google.c om
or somewhere else on the net here is some code that worked for me and might
work for John as well:
Private Declare Function GetForegroundWi ndow _
Lib "user32" () As IntPtr
Private Declare Function SetForegroundWi ndow _
Lib "user32" (ByVal hWnd As IntPtr) As Boolean
Private Declare Function GetWindowThread ProcessId _
Lib "user32" (ByVal hWnd As IntPtr, _
ByVal lpdwProcessId As IntPtr) As Integer
Private Declare Function AttachThreadInp ut _
Lib "user32" (ByVal idAttach As Integer, _
ByVal idAttachTo As Integer, ByVal fAttach As Boolean _
) As Boolean
Private Declare Function FindWindow _
Lib "user32" Alias "FindWindow A" (ByVal lpClassName As String, _
ByVal lpWindowName As String) As IntPtr
Private Sub Button1_Click( _
ByVal sender As System.Object, _
ByVal e As System.EventArg s) _
Handles Button1.Click
Dim hwndApp As IntPtr
Dim hwndForeground As IntPtr
Dim ThreadForegroun d As Integer
hwndApp = FindWindow("Not epad", "Untitled - Notepad")
If Not hwndApp.Equals( IntPtr.Zero) AndAlso _
Not hwndApp.Equals( GetForegroundWi ndow) Then
ThreadForegroun d = GetWindowThread ProcessId(hwndF oreground,
IntPtr.Zero)
AttachThreadInp ut(ThreadForegr ound, 0, True)
SetForegroundWi ndow(hwndApp)
AttachThreadInp ut(ThreadForegr ound, 0, False)
End If
End Sub
One may have to use Spy++ to get more details about the window that shall be
set to the foreground.
Cheers
Arne Janning
Good example Arne...
--
Tom Shelton [MVP]
Many thanks for all the assistance here :-) Very much appreciated!
JC
Many thanks for all the assistance here :-) Very much appreciated!
JC
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