pinvoke.net: Edit: coredll.sendmessage

@msdn=http://msdn2.microsoft.com/en-us/library/ms793467.aspx
@pinvoke=http://pinvoke.net/$$$.htm

Summary: A summary

!!!!C# Signature:

[DllImport("coredll.dll")]
 private static extern IntPtr SendMessage(IntPtr hWnd, int Msg, IntPtr wParam, IntPtr lParam);

!!!!VB Signature:

Declare Function SendMessage Lib "coredll.dll" (ByVal hWnd As IntPtr, ByVal Msg As Integer, ByVal wParam As Integer, ByVal lParam As Integer) As IntPtr

!!!!Notes:

If you are searching for a way to send keys to an application, you can use System.Windows.Forms.SendKeys.Send(keys) after bringing the window to the top via the SetForegroundWindow API.

!!!!Tips & Tricks:

!!!!Sample Code:

public partial class Form1 : Form
    {
    public Form1()
    {
        InitializeComponent();
    }

private void button1_Click(object sender, EventArgs e)
    {
        //Down
        User32.SendMessage(listView1.Handle, User32.WM.WM_KEYDOWN, (int)User32.VK.VK_DOWN, 0);
        User32.SendMessage(listView1.Handle, User32.WM.WM_KEYUP, (int)User32.VK.VK_DOWN, 0);
    }

private void button2_Click(object sender, EventArgs e)
    {
        //Up
        User32.SendMessage(listView1.Handle, User32.WM.WM_KEYDOWN, (int)User32.VK.VK_UP, 0);
        User32.SendMessage(listView1.Handle, User32.WM.WM_KEYUP, (int)User32.VK.VK_UP, 0);
    }

//Left ... Right...
    }

class User32
    {
    [System.Runtime.InteropServices.DllImport("coredll.dll")]
    public static extern int SendMessage(IntPtr hWnd, WM Msg, int wParam, int lParam);

public enum VK : int
    private void button2_Click(object sender, EventArgs e)
    {
        VK_DOWN = 0x28,
        VK_UP = 0x26,
        VK_LEFT = 0x25,
        VK_RIGHT = 0x27
    }
        //Up
        User32.SendMessage(listView1.Handle, User32.WM.WM_KEYDOWN, (int)User32.VK.VK_UP, 0);
        User32.SendMessage(listView1.Handle, User32.WM.WM_KEYUP, (int)User32.VK.VK_UP, 0);

public enum WM
    {
        WM_KEYUP = 0x0101,
        WM_KEYDOWN = 0x0100
    }
    }
        //Left ... Right...

}

private void Form1_Load(object sender, EventArgs e)
    {

}
    }

class User32
    {
    [System.Runtime.InteropServices.DllImport("coredll.dll")]
    public static extern int SendMessage(IntPtr hWnd, WM Msg, int wParam, int lParam);

public enum VK : int
    {
        VK_DOWN = 0x28,
        VK_UP = 0x26,
        VK_LEFT = 0x25,
        VK_RIGHT = 0x27
    }

public enum WM
    {
        WM_KEYUP = 0x0101,
        WM_KEYDOWN = 0x0100
    }
    }

!!!!Alternative Managed API:

Do you know one? Please contribute it!

Documentation: SendMessage@msdn on MSDN - moved to: http://msdn.microsoft.com/en-us/library/aa931932.aspx