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I noticed that the size of the two files is different... The one created using "Option 1" is 1144 bytes and the one created using "Option 2" is 1160 bytes. Perhaps this will help someone explain to me what is happening? Thanks again,
Sounds like somebody's got a case of the Mondays
-Jeff
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I don't use the CryptoStream (I have an article about a SecureStream, but I think it will not work for you) but as I remember there is a FlushFinalBlock in the CryptoStream. I think you should use it because I think the "FinalBlock" will include additional information that is needed during decryption.
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Thanks... the FlushFinalBlock() operation you suggested worked! Thank you very much!
Sounds like somebody's got a case of the Mondays
-Jeff
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I use Microsoft.DirectX.AudioVideoPlayback for video player, and I don't know how to get frequencies and amplitude of the sound (when playing video) to draw a waveform. I can't find any-code about it. Somebode help me please!! 
Thank you for your help.
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This article[^] demonstrates how to resolve the frequencies and amplitudes of audio waveforms using a FFT algorithm, and even provides code for displaying it. As to accessing the actual audio sample stream, you'll have to look into the DirectX API yourself; I have no idea how it works. I'm sure it's encoded in some way to include synchronized audio and video packet streams for your multimedia hardware to display it correctly, and that will have to be converted to a stream of instantaneous audio samples at a uniform sample rate to make the FFT algorithm work. If the audio is time-compressed it will have to be expanded, and if amplitude compressed an inverse transform will have to be applied to restore the original dynamic range.
By the way, Google led me straight back here. There is an extensive collection of member articles about audio and video manipulation available at CodeProject, and if you haven't already done so, it would be very helpful to you to spend some time reading them. Some contain far more information than their titles would imply.
Good luck, and I look forward to your article appearing once you solve this one.
"A Journey of a Thousand Rest Stops Begins with a Single Movement"
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Hi All,
how find all used / connected COM PORT on the system??
Thanks.
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First, include System.IO.Ports this snippet shout help you:
foreach (string portName in SerialPort.GetPortNames())
{
SerialPort port = new SerialPort(portName);
Console.WriteLine("{0} is open = {1}", port.PortName, port.IsOpen);
}
The important thing is the SerialPort object, it allows communication with the port and has plenty of useful properties and methods see http://msdn.microsoft.com/en-us/library/system.io.ports.serialport(VS.80).aspx[^] for more details.
CCC solved so far: 2 (including a Hard One!)
37!?!! - Randall, Clerks
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Thanks!
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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.IWMPMedia media;
ArrayList ar = new ArrayList();
int intCount = 0;
List<int> numbers = new List<int>();
float currentSize = 10;
string currentFont = "DS-Digital";
public Form1()
{
InitializeComponent();
}
[STAThread]
[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);
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;
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:
textBox1.Text += "Browser Back key caught" +
Environment.NewLine;
break;
case VK_BROWSER_FORWARD:
textBox1.Text += "Browser Forward key caught" +
Environment.NewLine;
break;
case VK_BROWSER_REFRESH:
textBox1.Text += "Browser Refresh key caught" +
Environment.NewLine;
break;
case VK_BROWSER_STOP:
textBox1.Text += "Browser Stop key caught" +
Environment.NewLine;
break;
case VK_BROWSER_SEARCH:
textBox1.Text += "Browser Search key caught" +
Environment.NewLine;
break;
case VK_VOLUME_MUTE:
textBox1.Text += "Volume Mute key caught" +
Environment.NewLine;
break;
case VK_VOLUME_DOWN:
textBox1.Text += "Volume Down key caught" +
Environment.NewLine;
break;
case VK_VOLUME_UP:
textBox1.Text += "Volume Up key caught" +
Environment.NewLine;
break;
case VK_MEDIA_NEXT_TRACK:
textBox1.Text += "Media Next Track key caught" +
Environment.NewLine;
break;
case VK_MEDIA_PREV_TRACK:
textBox1.Text += "Media Previous Track key caught" +
Environment.NewLine;
break;
case VK_MEDIA_STOP:
textBox1.Text += "Media Stop key caught" +
Environment.NewLine;
break;
case VK_MEDIA_PLAY_PAUSE:
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
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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
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Hi Covean.
That is all the "hook" code I have. I am not exactly clear what you are asking for. WHEELS
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Ok so this will be the problem. ^^
Without calling SetWindowsHookEx how should the system know what you wanna hook?
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
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Now I understand. I have the following:
private void button1_Click(object sender, System.EventArgs e)
{
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)
{
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
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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
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Still get same error when I capitalize appDomain. WHEELS
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Wheels012 wrote: Still get same error when I capitalize appDomain. WHEELS
Still wrong. There are 2 letters to capatilaze: "AppDomain"
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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.
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it is a windows application
I want to validate the datagridview cell ,it has to accepct only alphabets and numerics
HFGHFGHFGHFGHFHFHFHFHFHFHFHFHF
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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.
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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
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GetPixel is seriously slow. Take a look at this article:
ImageTraverser[^]
Regards,
Rob Philpott.
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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?
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Gif supports transparency, can't you make the background transparent in your gif images? Would this do what you need?
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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.
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