C# Discussion Boards - CodeProject

Creating an TWAIN ActiveX and calling it from Web Browser

IndoDev8-Nov-06 22:26

8-Nov-06 22:26

Hi,

Recently I have been working on creating an ActiveX DLL (for performing Image Scan using TWAIN and C#) which could be invoked using a Javascript call from an HTML page and the scanned image could be displayed within the page. I got most of the things but when I invoke the TWAIN driver, it displays the scanning control, I can perform New Scan multiple times within it but when I click at Accept nothing happens, the same code works perfectly when I invoke it from a Windows Form.

I trapped Windows Messages, it seems that when I do a call to the ActiveX from HTML it does not send any message back when I click Accept in the Scanning control.

The code for using TWAIN scanning using C# writtem by NETMaster was the guide for my current activity.

Help would be highly appreciated.

Regards,

P2P File transfers

Sri harini8-Nov-06 22:23

Sri harini

8-Nov-06 22:23

Hi,

I developed P2P file transfers application using C#.NET in PC its working fine , but in Windows Mobile 5.0 , the chunks downloading is not complete, after downloading 4 or 5 chunks(32kB), its stopping.How to speed up the application?..
Anybody have idea?please help me..

Re: P2P File transfers

SeMartens9-Nov-06 5:26

SeMartens

9-Nov-06 5:26

Hi Sri harini,

being a bit more specific would be helpful. What kind of protocol are you using (TCP or UDP)? How do you buffer the chunks? How does it stop, with an exception? Maybe you should also post relevant parts of your code.

Regards
Sebastian

Re: P2P File transfers

Sri harini9-Nov-06 16:28

Sri harini

9-Nov-06 16:28

Hi Sebastian

We are using the following code to Read data,using TCP protocol.How to set the receive timeout option in Windows Mobile.Bcoz its throwing exception when we use SetSocketOption Method.

Please advise.

public void ReadData()

{

Byte[] buffer=null;
Socket s=null;
int port = threadVars.port;
int chunksize=threadVars.chunksize;
int cid = threadVars.cid;
int fileid = threadVars.fileid;
string hash = threadVars.chnkhash;
readlocked = false;
s=new Socket( SocketAddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
s.Bind(new IPEndPoint(IPAddr, port));
s.Listen(1);
Socket actualReader = s.Accept();
NetworkStream DataStream = new NetworkStream(actualReader);
int offset = 0;
int bytesActuallyRead = 0;
int i=0;
do
{
i = i++;
bytesActuallyRead = DataStream.Read(buffer, offset, buffer.Length - offset);
offset += bytesActuallyRead;
if (bytesActuallyRead == 0)
{
break;
}

Thread.Sleep(10);
}
while(actualReader.Connected && i<1000);

parentController.SocketReadComplete(false,cid, fileid, buffer,chunksize,hash);
}
DataStream.Flush();
DataStream.Close();
s.Close();

}

Thanks
Sri harini

A/V stream

Mustafa Ismail Mustafa8-Nov-06 22:11

Mustafa Ismail Mustafa

8-Nov-06 22:11

Does anyone know how I can start or get more info on how to capture an A/V (audio/visual) stream? either directly like from a mic or a (web)cam or from a file.

Any clues?

Much appreciated.

Got a coding problem? Hand it to the CodeDevil!
______________________

Its the idiot who stops learning and the wise that keep asking you questions!!!!

How to set Screen Resolution.

Jay Khanpara8-Nov-06 22:04

Jay Khanpara

8-Nov-06 22:04

Hi,

I have devolped one .net application using c#.net, according to my application requirement it should run only in 1024*768 resolution..

so, how can i get the resolution for a particular machine and change it to my desired resolution?

is that possible?

Jaydeep

Re: How to set Screen Resolution.

rah_sin8-Nov-06 22:41

rah_sin

8-Nov-06 22:41

for getting current resolution of system u can use

Screen.PrimaryScreen.Bounds.Height;
Screen.PrimaryScreen.Bounds.Width;

to change the resolution of system there is no direct way u have to use some window API's

rahul

Re: How to set Screen Resolution.

Eric Dahlvang9-Nov-06 4:42

Eric Dahlvang

9-Nov-06 4:42

It is generally bad practice to change the resolution on your users' machines. However, here is a good article about how to do it in C#:

Using P/Invoke to Call Unmanaged APIs from Your Managed Classes[^]
See the section: Task 2: Changing the Display Resolution

--EricDV Sig---------
Some problems are so complex that you have to be highly intelligent and well informed just to be undecided about them.
- Laurence J. Peters

Arguments to a process

Rahul.RK8-Nov-06 21:56

Rahul.RK

8-Nov-06 21:56

Hello,

Friends, I want to pass parameters to a process while starting. And in process get

that parameters. How to do that.

Rahul Kulkarni

Re: Arguments to a process

Stefan Troschuetz8-Nov-06 22:07

Stefan Troschuetz

8-Nov-06 22:07

RahulRKulkarni wrote:
I want to pass parameters to a process while starting

Use overload of Process.Start that takes an arguments parameter.

RahulRKulkarni wrote:
And in process get that parameters

Change the main method of application to Main(String[] args). args will conatin the passed command line parameters.

"Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning." - Rick Cook

www.troschuetz.de

Re: Arguments to a process

Rahul.RK8-Nov-06 22:19

Rahul.RK

8-Nov-06 22:19

Thank You very much.

It works fine...

Rahul Kulkarni

BallonTip not showing

SoftcodeSoftware8-Nov-06 21:56

SoftcodeSoftware

8-Nov-06 21:56

I am having a problem on MS Vista with balloon tips not showing, even with simple code like:

notifyIcon1.ShowBalloonTip(3000, "Test", "This is a test Wink | ;)

", ToolTipIcon.Info);

Is there a new peice of code I should be using?

Thanks, Ben.

Re: BallonTip not showing

EscKey200412-Nov-06 19:32

EscKey2004

12-Nov-06 19:32

Are you using the Enable Visual Styles in your application?

[STAThread]<br />
static void Main() <br />
{<br />
Application.EnableVisualStyles();<br />
Application.Run(new Form1());<br />
}

exit, minimize, maximize buttons on the form title bar

quiteSmart8-Nov-06 21:45

quiteSmart

8-Nov-06 21:45

hi,

how can i hide the exit, minimize and maximize buttons that appear on the top right side of the scree inside the title bar of the form. And if it is possible, also tell me how to modify the code and the action that those button do when clicked.

thanks in advance

jamil abou khalil

Re: exit, minimize, maximize buttons on the form title bar

jiugarte9-Nov-06 0:49

jiugarte

9-Nov-06 0:49

to remove. go to publishing Designer selects the form and change the property ControlBox to false.

to intercept.

public const int WM_SYSCOMMAND = 0x0112;
public const int SC_CLOSE = 0xF060;
protected override void WndProc(ref Message m)
{
if( m.Msg == WM_SYSCOMMAND)
{
if( (int) m.WParam.ToInt32() == SC_CLOSE )
{
if (ProjectIsOpen)
{
return;
}
else
{
this.Close();
Application.Exit();
}
}
}
base.WndProc (ref m);
}

Smile | :)

Re: exit, minimize, maximize buttons on the form title bar

quiteSmart9-Nov-06 1:16

quiteSmart

9-Nov-06 1:16

hi,
first thanks for your reply. second i want to ask you a more detailed question. what if i want to hide only the close button and the maximize button and keep the minimize button. The property ControlBox when set to false hides the three buttons together even if i try to set the maximizebox to true it want appear.

i hope u have a solution for that.

jamil abou khalil

Re: exit, minimize, maximize buttons on the form title bar

jiugarte13-Nov-06 1:23

jiugarte

13-Nov-06 1:23

try it.

private const int SC_CLOSE = 0xF060;
private const int SC_MAXIMIZE = 0xF030;
private const int SC_MINIMIZE = 0xF020;
private const int SC_RESTORE = 0xF120;

private const int MF_GRAYED = 0x1;

[System.Runtime.InteropServices.DllImport("user32.dll")]
private static extern IntPtr GetSystemMenu(IntPtr hWnd, bool bRevert);

[System.Runtime.InteropServices.DllImport("user32.dll")]
private static extern int EnableMenuItem(IntPtr hMenu, int wIDEnableItem, int wEnable);

private void Disable_opt()
{
EnableMenuItem(GetSystemMenu(this.Handle, false), SC_CLOSE, MF_GRAYED);
EnableMenuItem(GetSystemMenu(this.Handle, false), SC_MAXIMIZE, MF_GRAYED);
EnableMenuItem(GetSystemMenu(this.Handle, false), SC_MINIMIZE, MF_GRAYED);
EnableMenuItem(GetSystemMenu(this.Handle, false), SC_RESTORE, MF_GRAYED);
}

Smile | :)

datatypes conversion

ikbahrian8-Nov-06 21:02

ikbahrian

8-Nov-06 21:02

In C Language how can we do the following.. Confused | :confused:

conversion of the (int) to char
conversion of the (int) to (unsigned char) ------------interger to unsigned char
conversion of the (int) to (unsigned char *) ----------------interger to unsigned char pointer

Thanks..

Re: datatypes conversion

Stefan Troschuetz8-Nov-06 21:24

Stefan Troschuetz

8-Nov-06 21:24

Wrong message board

Re: datatypes conversion

Guffa8-Nov-06 21:24

Guffa

8-Nov-06 21:24

Perhaps you should ask this in the C forum instead.

---
b { font-weight: normal; }

how to write program for Automatic log off

Pavan Josh8-Nov-06 19:42

Pavan Josh

8-Nov-06 19:42

Hello all,

I have written a small windows form application in .NET 2005 using C#.

Now i have to include a functionality of automatic logging off in that application. Will u guys please help me to know whether is there any support already in .NET to do that, or should i do it through threads.

Please help me. Its very urgent. Ur help will be greatly appreciated.

Thanks and Regards
Pavan Joshi

Re: how to write program for Automatic log off

Ashish Derhgawen9-Nov-06 4:01

Ashish Derhgawen

9-Nov-06 4:01

Hey Pavan,

If you're using Windows XP, you can logoff by launching C:\Windows\System32\Logoff.exe:

System.Diagnostics.Process.Start(@"C:\Windows\System32\Logoff.exe");

I just got logged off in testing this line of code. lol! However, I'm not sure if this is the best way to do it. Check out:

http://www.codeproject.com/csharp/timercomputershutdown.asp?df=100&forumid=10485&exp=0&select=799275

Hope this helps,
Ashish Cool | :cool:

Time flies like an arrow;
Fruit flies like a banana.

Ashish Derhgawen - http://ashishrd.blogspot.com[^]

How to implement a screenlock

jamesjk8-Nov-06 19:34

jamesjk

8-Nov-06 19:34

Hi Buddies,

Could somebody help me in implementing a screenlock?
What I'm trin' to do is, if the user is not interacting with the system for a stipulated time I need to lock the screen, thereby forcing the user to enter his password to unlock the system.

Thanks to all in Advance

Re: How to implement a screenlock

Martin#8-Nov-06 20:01

Martin#

8-Nov-06 20:01

Hello,

Fast solution: create a full screen TopMost window with passwordbox.

All the best,

Martin

Re: How to implement a screenlock

Tamimi - Code8-Nov-06 20:05

Tamimi - Code

8-Nov-06 20:05

funny

When you get mad...THINK twice that the only advice
Tamimi - Code

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.