"James Kirkup" <ta*******@hotmail.com> wrote in message
news:es*************@TK2MSFTNGP09.phx.gbl...
Hello,
Does anyone know in code how to turn the NumLock key on in C#?
No support in the FCL, so you will have to Pinvoke, here's a working
sample....
using System;
using System.Runtime.InteropServices;
namespace Willys
{
class Tester
{
[StructLayout(LayoutKind.Sequential)]
public struct INPUT
{
internal int type;
internal short wVk;
internal short wScan;
internal int dwFlags;
internal int time;
internal IntPtr dwExtraInfo;
int dummy1;
int dummy2;
internal int type1;
internal short wVk1;
internal short wScan1;
internal int dwFlags1;
internal int time1;
internal IntPtr dwExtraInfo1;
int dummy3;
int dummy4;
}
[DllImport("user32.dll")]
static extern int SendInput(uint nInputs, IntPtr pInputs, int cbSize);
static void Main()
{
const int mouseInpSize = 28;//Hardcoded size of the MOUSEINPUT tag !!!
INPUT input = new INPUT();
input.type = 0x01; //INPUT_KEYBOARD
input.wVk = 0x90; //VK_NUMLOCK
input.wScan = 0;
input.dwFlags = 0; //key-down
input.time = 0;
input.dwExtraInfo = IntPtr.Zero;
input.type1 = 0x01;
input.wVk1 = 0x90;
input.wScan1= 0;
input.dwFlags1 = 2; //key-up
input.time1 = 0;
input.dwExtraInfo1 = IntPtr.Zero;
IntPtr pI = Marshal.AllocHGlobal(mouseInpSize * 2);
Marshal.StructureToPtr(input, pI, false);
int result = SendInput(2, pI, mouseInpSize); //Hardcoded size of the
MOUSEINPUT tag !!!
if (result == 0 || Marshal.GetLastWin32Error() != 0)
Console.WriteLine(Marshal.GetLastWin32Error());
Marshal.FreeHGlobal(pI);
}
}
}
Willy.
