pinvoke.net: Edit: user32.getclassname

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Summary: The GetClassName API

!!!!C# Signature:
 [DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)]
 static extern int GetClassName(IntPtr hWnd, StringBuilder lpClassName,int nMaxCount);

!!!!VB.NET Signature:
 <DllImport("user32.dll", CharSet:=CharSet.Auto)> _
 Private Shared Function GetClassName(ByVal hWnd As System.IntPtr, _
   ByVal lpClassName As System.Text.StringBuilder, _
   ByVal nMaxCount As Integer) As Integer
    ' Leave function empty         
 End Function

!!!! Alternate VB.NET Signature:
 Public Declare Auto Function GetClassName Lib "User32.dll" (ByVal hwnd As IntPtr, _
	<Out()> ByVal lpClassName As System.Text.StringBuilder, _
	ByVal nMaxCount As Integer) As Integer

!!!!VB Signature
 Public Declare Function GetClassName Lib "user32" Alias "GetClassNameA" _
                 (ByVal hWnd As Long, _
                  ByVal lpClassName As String, _
                  ByVal nMaxCount As Long) As Long
!!!!Notes:
In .NET Framework 4.0, only CharSet.Ansi seems to produce the result.

The return type int seems to crash the .NET application in 64-bit mode (occasionally), long seems to work better. Maybe it should even be IntPtr? Please modify this note if you have more insights.

!!!!Tips & Tricks:
Please add some!

!!!!Sample Code:
'''C# Sample Code'''
 private static bool isIEServerWindow(IntPtr hWnd)
 {
	int nRet;
	// Pre-allocate 256 characters, since this is the maximum class name length.
	StringBuilder ClassName = new StringBuilder(256);
	//Get the window class name
	nRet = GetClassName(hWnd, ClassName, ClassName.Capacity);
	if(nRet != 0)
	{
		return (string.Compare(ClassName.ToString(), "Internet Explorer_Server",true,CultureInfo.InvariantCulture) == 0);
	}
	else
	{
		return false;
	}
 }

'''VB.NET Sample Code'''
Create a new VB .NET form and add a button Button1 to it.

Private Sub Button1_Click(ByVal sender As System.Object, _
        ByVal e As System.EventArgs) Handles Button1.Click
   Dim sClassName As New StringBuilder("", 256)
   'pass in the handle of the object for which to get
   'the class name; for example, the form's handle
   Call GetClassName(Me.Handle, sClassName, 256)
   MessageBox.Show(sClassName.ToString) 
 End Sub
!!!!Alternative Managed API:
The ManagedWindowsApi project (http://mwinapi.sourceforge.net) provides a 
class ManagedWinapi.SystemWindow that has a ClassName property.

Documentation: GetClassName@msdn on MSDN