pinvoke.net: Edit: user32.sendmessage

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Summary: The SendMessage API

!!!!C# Signature:
 [DllImport("user32.dll", CharSet = CharSet.Auto)]
 public static extern IntPtr SendMessage(IntPtr hWnd, uint Msg, nuint wParam, StringBuilder lParam);
 
 [DllImport("user32.dll", CharSet = CharSet.Auto)]
 public static extern IntPtr SendMessage(IntPtr hWnd, uint Msg, nuint wParam, [MarshalAs(UnmanagedType.LPWStr)] string lParam);
 
 [DllImport("user32.dll", CharSet = CharSet.Auto)]
 public static extern IntPtr SendMessage(IntPtr hWnd, uint Msg, nuint wParam, [MarshalAs(UnmanagedType.LPWStr)] string lParam);
 
 [DllImport("user32.dll", CharSet = CharSet.Auto)]
 public static extern IntPtr SendMessage(IntPtr hWnd, uint Msg, nuint wParam, ref nint lParam);
 
 [DllImport("user32.dll", CharSet = CharSet.Auto)]
 public static extern IntPtr SendMessage(IntPtr hWnd, uint Msg, nuint wParam, nint lParam);

!!!!VB Signature:
 <DllImport("user32.dll", CharSet:=CharSet.Auto)>
 Public Shared Function SendMessage(ByVal hWnd As IntPtr, ByVal Msg As Integer, ByVal wParam As IntPtr, ByVal lParam As StringBuilder) As IntPtr
 End Function
 
 <DllImport("user32.dll", CharSet:=CharSet.Auto)>
 Public Shared Function SendMessage(ByVal hWnd As IntPtr, ByVal Msg As Integer, ByVal wParam As IntPtr, <MarshalAs(UnmanagedType.LPWStr)> ByVal lParam As String) As IntPtr
 End Function
 
 <DllImport("user32.dll", CharSet:=CharSet.Auto)>
 Public Shared Function SendMessage(ByVal hWnd As IntPtr, ByVal Msg As Integer, ByVal wParam As Integer, <MarshalAs(UnmanagedType.LPWStr)> ByVal lParam As String) As IntPtr
 End Function
 
 <DllImport("user32.dll", CharSet:=CharSet.Auto)>
 Public Shared Function SendMessage(ByVal hWnd As IntPtr, ByVal Msg As Integer, ByVal wParam As Integer, ByRef lParam As IntPtr) As IntPtr
 End Function
 
 <DllImport("user32.dll", CharSet:=CharSet.Auto)>
 Public Shared Function SendMessage(ByVal hWnd As IntPtr, ByVal Msg As Integer, ByVal wParam As Integer, ByVal lParam As IntPtr) As IntPtr
 End Function
!!!!Notes:
None.

!!!!Tips & Tricks:
Used when propagating environment variables, for instance, updating the Path, without requiring a reboot: see also http://support.microsoft.com/kb/104011

Please add some!

!!!!Sample Code:
'''C# Samples'''
 //Set a note to a CommandLink
 SendMessage(myCommandLink, BCM_SETNOTE, 0, "My CommandLink Note");
 
 //Retrieve a text using WM_GETTEXT
 int length = SendMessage(myHwndHandle, WM_GETTEXTLENGTH, 0, 0).ToInt32();
 StringBuilder builder = new StringBuilder(length);
 SendMessage(myHwndHandle, WM_GETTEXT, length, builder);

'''VB.NET Samples'''
Function GetWindowTitle(hWnd As IntPtr) As String
    Dim length As Integer = SendMessage(hWnd, WM_GETTEXTLENGTH, 0, 0)
    Dim title As New String(New Char, length)
    SendMessage(hWnd, WM_GETTEXT, length+1, title)
    Return title
End Function
 
!!!!Alternative Managed API:
Do you know one?  Please contribute it!

Documentation: SendMessage@msdn on MSDN