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Private Shared Function FindWindow(ByVal lpClassName As String, ByVal lpWindowName As String) As IntPtr
End Function
<DllImport("user32.dll", EntryPoint:="FindWindow", SetLastError:=True, CharSet:=CharSet.Auto)> _
Private Shared Function FindWindowByClass(ByVal lpClassName As String, ByVal zero As IntPtr) As IntPtr
End Function
<DllImport("user32.dll", EntryPoint:="FindWindow", SetLastError:=True, CharSet:=CharSet.Auto)> _
Private Shared Function FindWindowByCaption(ByVal zero As IntPtr, ByVal lpWindowName As String) As IntPtr
End Function
User-Defined Types:
None.
Notes:
The FindWindow function retrieves the handle to the top-level window whose class name and window name match the specified strings. This function does not search child windows.
*If lpClassName is NULL FindWindow will search for the window by the lpWindowName (window's title) only. This is useful if the class of a particular window is variable.
Tips & Tricks:
Use the fantastic Spy++ (One of the vStudio tools) to get details of specific Windows you're looking for.
Sample Code (C#):
public static int FindWindow(string windowName, bool wait)
{
int hWnd = FindWindow(null, windowName);
while (wait && hWnd == 0)
{
System.Threading.Thread.Sleep(500);
hWnd = FindWindow(null, windowName);
}
return hWnd;
}
// THE FOLLOWING METHOD REFERENCES THE SetForegroundWindow API
public static bool BringWindowToTop(string windowName, bool wait)
{
int hWnd = FindWindow(windowName, wait);
if (hWnd != 0)
{
return SetForegroundWindow((IntPtr)hWnd);
}
return false;
}
Sample Code (C#):
//Open Up blank Notepad First !
string lpszParentClass = "Notepad";
string lpszParentWindow = "Untitled - Notepad";
string lpszClass = "Edit";
IntPtr ParenthWnd = new IntPtr(0);
IntPtr hWnd = new IntPtr(0);
ParenthWnd = FindWindow(lpszParentClass,lpszParentWindow);
if (ParenthWnd.Equals(IntPtr.Zero))
Console.WriteLine("Notepad Not Running");
else
{
hWnd = FindWindowEx(ParenthWnd,hWnd,lpszClass,"");
if (hWnd.Equals(IntPtr.Zero))
Console.WriteLine("What the F??? Notepad doesn't have an edit component ?");
else
{
Console.WriteLine("Notepad Window: " + ParenthWnd.ToString());
Console.WriteLine("Edit Control: " + hWnd.ToString());
}
}
'// VB (chellios at gmail dot com)
'// Open up a blank Notepad!
Dim lpszParentClass As String = "Notepad"
Dim lpszParentWindow As String = "Untitled - Notepad"
Dim lpszClass As String = "Edit"
Dim ParenthWnd As New IntPtr(0)
Dim hWnd As New IntPtr(0)
If ParenthWnd.Equals(IntPtr.Zero) Then
Debug.WriteLine("Notepad Not Running!")
Else
hWnd = FindWindowEx(ParenthWnd, hWnd, lpszClass, "")
If hWnd.Equals(IntPtr.Zero)
Debug.WriteLine("What the F??? Notepad doesn't have an Edit component, how strange.")
Else
Debug.WriteLine("Notepad Window: " & ParenthWnd.ToString())
Debug.WriteLine("Edit Control: " & hWnd.ToString())
End If
End If
Alternative Managed API:
Do you know one? Please contribute it!
ByVal is a VB keyword that specifies a variable to be passed as a parameter BY VALUE. In other words, if the function or sub changes the value of the internal variable, it does not change the value of the external variable that was passed to it.
4/25/2007 3:19:55 AM - josep1er@cmich.edu-141.209.229.179
ByVal is a VB keyword that specifies a variable to be passed as a parameter BY VALUE. In other words, if the function or sub changes the value of the internal variable, it does not change the value of the external variable that was passed to it.
4/25/2007 3:19:55 AM - josep1er@cmich.edu-141.209.229.179
An IntPtr is a pointer to a memory location (unmanaged) that adapts to the platform it is running on (64-bit, etc.) UNLIKE a standard int/Integer. You should always use this type for unmanaged calls that require it, even though an int will appear to work on your development machine.
1/13/2008 4:00:13 AM - Damon Carr-72.43.165.29
ByVal is a VB keyword that specifies a variable to be passed as a parameter BY VALUE. In other words, if the function or sub changes the value of the internal variable, it does not change the value of the external variable that was passed to it.
4/25/2007 3:19:55 AM - josep1er@cmich.edu-141.209.229.179
ByVal is a VB keyword that specifies a variable to be passed as a parameter BY VALUE. In other words, if the function or sub changes the value of the internal variable, it does not change the value of the external variable that was passed to it.
4/25/2007 3:19:55 AM - josep1er@cmich.edu-141.209.229.179
An IntPtr is a pointer to a memory location (unmanaged) that adapts to the platform it is running on (64-bit, etc.) UNLIKE a standard int/Integer. You should always use this type for unmanaged calls that require it, even though an int will appear to work on your development machine.
1/13/2008 4:00:13 AM - Damon Carr-72.43.165.29
An IntPtr is a pointer to a memory location (unmanaged) that adapts to the platform it is running on (64-bit, etc.) UNLIKE a standard int/Integer. You should always use this type for unmanaged calls that require it, even though an int will appear to work on your development machine.
1/13/2008 4:00:13 AM - Damon Carr-72.43.165.29
ByVal is a VB keyword that specifies a variable to be passed as a parameter BY VALUE. In other words, if the function or sub changes the value of the internal variable, it does not change the value of the external variable that was passed to it.
4/25/2007 3:19:55 AM - josep1er@cmich.edu-141.209.229.179
An IntPtr is a pointer to a memory location (unmanaged) that adapts to the platform it is running on (64-bit, etc.) UNLIKE a standard int/Integer. You should always use this type for unmanaged calls that require it, even though an int will appear to work on your development machine.
1/13/2008 4:00:13 AM - Damon Carr-72.43.165.29
ByVal is a VB keyword that specifies a variable to be passed as a parameter BY VALUE. In other words, if the function or sub changes the value of the internal variable, it does not change the value of the external variable that was passed to it.
4/25/2007 3:19:55 AM - josep1er@cmich.edu-141.209.229.179
An IntPtr is a pointer to a memory location (unmanaged) that adapts to the platform it is running on (64-bit, etc.) UNLIKE a standard int/Integer. You should always use this type for unmanaged calls that require it, even though an int will appear to work on your development machine.
1/13/2008 4:00:13 AM - Damon Carr-72.43.165.29
The FindWindowEx API
7/24/2021 9:48:36 PM - a-202.69.38.82
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