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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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C# Signature:
[DllImport("coredll")]
public static extern int SendMessage(IntPtr hWnd, uint Msg, int wParam, int 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...
Alternative Managed API:
Do you know one? Please contribute it!
}
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
}
}
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
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
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