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SendMessage (coredll)
 

coredll is for smart devices, not desktop Windows. Therefore, this information only applies to code using the .NET Compact Framework. To see if information for SendMessage in other DLLs exists, click on Find References to the right.

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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
    }
    }

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