C# Discussion Boards - CodeProject

Re: Detecting music keys from keyboard in winform app

5-Jan-10 2:22

Good morning.

I am trying to detect the music button events from the keyboard, but have been unsuccessful so far. I have the following code:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;
using System.IO;
using System.Collections;

namespace KPlayer
{
    public partial class Form1 : Form
    {
        WMPLib.WindowsMediaPlayer wmp = new WMPLib.WindowsMediaPlayer();
        WMPLib.IWMPPlaylist pl;
        //WMPLib.IWMPPlaylistArray plItems; 
        WMPLib.IWMPMedia media;

        // Required designer variable
        //private System.ComponentModel.Container components = null;

        ArrayList ar = new ArrayList();
        int intCount = 0;      
        List<int> numbers = new List<int>();
      
        float currentSize = 10;
        string currentFont = "DS-Digital";

        public Form1()
        {
            // Required for Windows Form Designer support
            InitializeComponent();
        }
       
        [STAThread]
        // Declare Windows API calls used to access Windows hooks
        [DllImport("user32.dll")]

        public static extern int SetWindowsHookEx(int hookType,
                                                   HookProc callback,
                                                   int instance,
                                                   int threadID);
        [DllImport("user32.dll")]
        public static extern int CallNextHookEx(int hookHandle, int code,
                                                int wparam, int lparam);
        [DllImport("user32.dll")]
        public static extern bool UnhookWindowsHookEx(int hookHandle);
        [DllImport("user32.dll")]
        public static extern int GetKeyState(int vKey);

        // Fields, constants, and structures used by the keyboard hook.
        int hookHandle = 0;
        HookProc cb = null;

        public const int WH_KEYBOARD = 2;

        public const int HC_ACTION = 0;
        public const int HC_NOREMOVE = 3;

        public const int VK_CONTROL = 0x11;
        public const int VK_LWIN = 0x5B;
        public const int VK_RWIN = 0x5C;
        public const int VK_APPS = 0x5D;
        public const int VK_LSHIFT = 0xA0;
        public const int VK_RSHIFT = 0xA1;
        public const int VK_LCONTROL = 0xA2;
        public const int VK_RCONTROL = 0xA3;
        public const int VK_LMENU = 0xA4;
        public const int VK_RMENU = 0xA5;
        public const int VK_BROWSER_BACK = 0xA6;
        public const int VK_BROWSER_FORWARD = 0xA7;
        public const int VK_BROWSER_REFRESH = 0xA8;
        public const int VK_BROWSER_STOP = 0xA9;
        public const int VK_BROWSER_SEARCH = 0xAA;
        public const int VK_VOLUME_MUTE = 0xAD;
        public const int VK_VOLUME_DOWN = 0xAE;
        public const int VK_VOLUME_UP = 0xAF;
        public const int VK_MEDIA_NEXT_TRACK = 0xB0;
        public const int VK_MEDIA_PREV_TRACK = 0xB1;
        public const int VK_MEDIA_STOP = 0xB2;
        public const int VK_MEDIA_PLAY_PAUSE = 0xB3;
        public const int KF_UP = 0x8000;
        public const long KB_TRANSITION_FLAG = 0x80000000;
        public const int VK_W = 0x57;

        // Keyboard hook delegate
        public delegate int HookProc(int code, int wparam, int lparam);
        public int Proc(int code, int wparam, int lparam)
        {
            if (code == HC_ACTION)
            {
                switch (wparam)
                {
                    case VK_BROWSER_BACK:
                        // Handle Back keyboard button here.
                        textBox1.Text += "Browser Back key caught" +
                                         Environment.NewLine;
                        break;
                    case VK_BROWSER_FORWARD:
                        // Handle Forward keyboard button here.
                        textBox1.Text += "Browser Forward key caught" +
                                         Environment.NewLine;
                        break;
                    case VK_BROWSER_REFRESH:
                        // Handle Refresh keyboard button here.
                        textBox1.Text += "Browser Refresh key caught" +
                                         Environment.NewLine;
                        break;
                    case VK_BROWSER_STOP:
                        // Handle Stop keyboard button here.
                        textBox1.Text += "Browser Stop key caught" +
                                         Environment.NewLine;
                        break;
                    case VK_BROWSER_SEARCH:
                        // Handle Search keyboard button here.
                        textBox1.Text += "Browser Search key caught" +
                                         Environment.NewLine;
                        break;
                    case VK_VOLUME_MUTE:
                        // Handle Mute keyboard button here.
                        textBox1.Text += "Volume Mute key caught" +
                                         Environment.NewLine;
                        break;
                    case VK_VOLUME_DOWN:
                        // Handle Volume - keyboard button here.
                        textBox1.Text += "Volume Down key caught" +
                                         Environment.NewLine;
                        break;
                    case VK_VOLUME_UP:
                        // Handle Volume + keyboard button here.
                        textBox1.Text += "Volume Up key caught" +
                                         Environment.NewLine;
                        break;
                    case VK_MEDIA_NEXT_TRACK:
                        // Handle Next Track keyboard button here.
                        textBox1.Text += "Media Next Track key caught" +
                                         Environment.NewLine;
                        break;
                    case VK_MEDIA_PREV_TRACK:
                        // Handle Previous Track keyboard button here.
                        textBox1.Text += "Media Previous Track key caught" +
                                         Environment.NewLine;
                        break;
                    case VK_MEDIA_STOP:
                        // Handle Stop keyboard button here.
                        textBox1.Text += "Media Stop key caught" +
                                         Environment.NewLine;
                        break;
                    case VK_MEDIA_PLAY_PAUSE:
                        // Handle PLAY keyboard button here.
                        textBox1.Text += "Media Play/Pause key caught" +
                                         Environment.NewLine;
                        break;
                }
            }
            return (CallNextHookEx(hookHandle, code, wparam, lparam));
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            wmp.PlayStateChange +=
                new WMPLib._WMPOCXEvents_PlayStateChangeEventHandler(Player_PlayStateChange);
            wmp.MediaError +=
                new WMPLib._WMPOCXEvents_MediaErrorEventHandler(Player_MediaError);

                   }

I don't get any errors, but it doesn't appear to work. Any ideas?

WHEELS

Covean5-Jan-10 3:11

Covean

5-Jan-10 3:11

Can you please post your call to SetWindowsHookEx.
What hook are you using WH_KEYBOARD or WH_KEYBOARD_LL?

Because the function delegate called by the hook (Proc in your case)
can be called from threads/processes beyond your scope, you should not
do this:

textBox1.Text += "Browser Back key caught" + Environment.NewLine;

Use an invoke or for testing purposes just trace.

Greetings
Covean

Re: Detecting music keys from keyboard in winform app

Wheels0125-Jan-10 3:18

Re: Detecting music keys from keyboard in winform app

5-Jan-10 3:18

Hi Covean.

That is all the "hook" code I have. I am not exactly clear what you are asking for. WHEELS

Covean5-Jan-10 3:51

Covean

5-Jan-10 3:51

Ok so this will be the problem. ^^

Without calling SetWindowsHookEx how should the system know what you wanna hook? Big Grin | :-D

Somewhere you should call (for example at form init):
IntPtr hHook = SetWindowsHookEx(WH_KEYBOARD or WH_KEYBOARD_LL(for low-level hook), Proc (delegate to your hook proc), Process.GetCurrentProcess().Handle, 0);
if(hHook == IntPtr.Zero)
{
// hook failed
}

At destruction time call UnhookWindowsHookEx(hHook);

Greetings
Covean

Re: Detecting music keys from keyboard in winform app

Wheels0125-Jan-10 4:09

Re: Detecting music keys from keyboard in winform app

5-Jan-10 4:09

Now I understand. I have the following:

// Click event handlers for button1 and button2.
private void button1_Click(object sender, System.EventArgs e)
{
    // Set the keyboard hook.
    if (hookHandle == 0)
    {
        cb = new HookProc(Proc);
        hookHandle = SetWindowsHookEx(WH_KEYBOARD, cb, 0,
                                      appdomain.GetCurrentThreadId( ));
    }
    else
    {
        textBox1.Text += "Hook already set" + Environment.NewLine;
    }
    textBox1.Text += "Start: " + hookHandle + Environment.NewLine;
}

private void button2_Click(object sender, System.EventArgs e)
{
    // Unhook the keyboard hook.
    textBox1.Text += "End: " + UnhookWindowsHookEx(hookHandle) +
                     Environment.NewLine;
    hookHandle = 0;
}

I am coming up with an error on this line:
hookHandle = SetWindowsHookEx(WH_KEYBOARD, cb, 0,
appdomain.GetCurrentThreadId( ));

appdomain doesn't exist in the current context.

WHEELS

Covean5-Jan-10 4:16

Covean

5-Jan-10 4:16

If you want to hook more than the input to your application, you should set dwThreadId to 0 and just set the instance handle (3rd parameter) to Process.GetCurrentProcess().Handle.

Btw: appdomain does not exists its called AppDomain.

Greetings
Covean

Re: Detecting music keys from keyboard in winform app

Wheels0125-Jan-10 4:58

Re: Detecting music keys from keyboard in winform app

5-Jan-10 4:58

Still get same error when I capitalize appDomain. WHEELS

Saksida Bojan5-Jan-10 6:09

How validate c# DataGridView Cell to accept only Alphabet characters upper, lower and Numeric

5-Jan-10 6:09

Wheels012 wrote:
Still get same error when I capitalize appDomain. WHEELS

Still wrong. There are 2 letters to capatilaze: "AppDomain"

OutlookAddin

Md. Marufuzzaman5-Jan-10 1:31

Md. Marufuzzaman

5-Jan-10 1:31

Hello All…
Hope all is well with you..

Actually I want to write a OutlookAddin it will add a simple dropdown combo box after the subject input area.... Can anyone give me some guideline..Please note that a have done this but the problem is it load at the end of the form.

Thanks
Md. Marufuzzaman

Don't forget to click [Vote] / [Good Answer] on the post(s) that helped you.

I will not say I have failed 1000 times; I will say that I have discovered 1000 ways that can cause failure – Thomas Edison.

Member 11161155-Jan-10 0:33

Member 1116115

5-Jan-10 0:33

it is a windows application
I want to validate the datagridview cell ,it has to accepct only alphabets and numerics

HFGHFGHFGHFGHFHFHFHFHFHFHFHFHF

Faster

sanforjackass5-Jan-10 0:28

sanforjackass

5-Jan-10 0:28

i have program that search for white point in screen, the code is:

namespace CameraLab
{
public class CamManeger
{

Point pp;

public Point PP
{
get
{
return pp;
}

set
{
pp = value;
}
}

[DllImport("user32.dll")]
public static extern void mouse_event(MouseEventType dwFlags, int dx, int dy, int cButtons, int dwExtraInfo);

[DllImport("user32")]
public static extern int SetCursorPos(int x, int y);

public enum MouseEventType : int
{
LeftDown = 0x02,
LeftUp = 0x04,
RightDown = 0x08,
RightUp = 0x10
}

public void test(Bitmap bm, int X, int Y, int x, int y ,Point pp,bool L)
{
bool z = false;

for (int i = X; i < x; i++)
{
for (int j = Y; j < y; j++)
{
if (bm.GetPixel(i, j).R == 255 && bm.GetPixel(i, j).G == 255 && bm.GetPixel(i, j).B == 255 && bm.GetPixel(i, j).R == 255)
{
Point p = new Point(Screen.PrimaryScreen.WorkingArea.Width - i, Screen.PrimaryScreen.WorkingArea.Height - j);
Cursor.Position = p;
this.PP = p;

z = true;
break;
}
}
if (z == true)
{
break;
}
}
}
}
}

can i make this code more faster.

Re: Faster [modified]

Saksida Bojan5-Jan-10 2:01

Proper way to determine the colors of controls?

5-Jan-10 2:01

Edit your code and add <pre> tags, because i can very hardly to read

The only thing you could improve (as i see), modify your if statement. But you won't get performance boost

if (bm.GetPixel(i, j) == Color.White)
{
}

Maybe you shoud look into directly into unmanaged GDI. (GDI+ is only a wraper around unmanaged GDI)

Edit: Styleing

modified on Tuesday, January 5, 2010 10:59 AM

Re: Faster

Rob Philpott5-Jan-10 2:12

Rob Philpott

5-Jan-10 2:12

GetPixel is seriously slow. Take a look at this article:

ImageTraverser[^]

Regards,
Rob Philpott.

Re: Faster

harold aptroot5-Jan-10 3:32

harold aptroot

5-Jan-10 3:32

Is that for an aimbot?

arnold_w5-Jan-10 0:20

Re: Proper way to determine the colors of controls?

5-Jan-10 0:20

Sometimes I need to determine the color of different controls. I give a couple a of examples. In a MessageBox I needed a custom made gif-icon and I wanted the background color of the icon to match the color of the MessageBox itself. In another project I wanted to get rid of the little sort-array in the header of a DataGridView and to do that I had to override the Paint-method and paint the arrow with the background color. To determine the colors in these two examples I did a print screen and pasted the screen dump into Paint and used the color picker to get the RGB-values. This works fine on most computer, but I have noticed that on some computers (depending on operating system and other things) the gray color is not the same as on my computer. Something tells me there must be a way to query the color to use instead of determining it by hand and then hardcoding it. How do I do this?

petercrab5-Jan-10 0:32

petercrab

5-Jan-10 0:32

Gif supports transparency, can't you make the background transparent in your gif images? Would this do what you need?

Re: Proper way to determine the colors of controls?

arnold_w5-Jan-10 0:36

Re: Proper way to determine the colors of controls?

5-Jan-10 0:36

Well, in the specific case with a gif-icon I could use transparency. However, I would still like to know how I can determine the color programmatically.

Saksida Bojan5-Jan-10 1:54

Re: Proper way to determine the colors of controls?

5-Jan-10 1:54

you could atempt use the folowing

Bitmap bmp;
// <snip>intelizing bmp

if (bmp.GetPixel(x,y) == Color.White) // Color has predefined colors. SystemColor has a system setting colors as predefind
{
}

arnold_w5-Jan-10 2:56

Re: Proper way to determine the colors of controls? [modified]

5-Jan-10 2:56

I don't understand how to use this. Can you please give an example how I can use it when I override the Paint-method for DataGridViewColumnHeaderCell:

protected override void Paint(Graphics graphics, Rectangle clipBounds, Rectangle cellBounds, int rowIndex, DataGridViewElementStates dataGridViewElementState, object value, object formattedValue, string errorText, DataGridViewCellStyle cellStyle, DataGridViewAdvancedBorderStyle advancedBorderStyle, DataGridViewPaintParts paintParts)

Saksida Bojan5-Jan-10 4:51

Re: Proper way to determine the colors of controls?

5-Jan-10 4:51

I actually don't remember Paint method has this many parameters. I assume you are inherited from DataGridView

The method I posted was intended from thread above yours. I posted in wrong but I left it because you asked a question in that post that could be correct answer.
It is better to get color from propties instead atempt to read from a point on the screan

DataGridView background color is default to SystemColors.AppWorkspace.

So I suggest you use to get your background color:

this.BackgroundColor

modified on Tuesday, January 5, 2010 10:57 AM

Saksida Bojan5-Jan-10 1:56

Re: Proper way to determine the colors of controls?

5-Jan-10 1:56

arnold_w wrote:
This works fine on most computer, but I have noticed that on some computers (depending on operating system and other things) the gray color is not the same as on my computer.

That could be cousing also by monitors. Some have Color temperature (or even named as Color Tone) setting

arnold_w5-Jan-10 2:04