Re: Disabling Print Screen - C# Discussion Boards

Wjousts25-Oct-05 4:15

25-Oct-05 4:15

You'll need to create your own dialog box. The MessageBox class is pretty well sealed up and you can't do much with it beyond what it's supposed to do. It shouldn't take more that five minutes to whip up your own dialog box class in Visual Studio anyway.

Re: MessageBox

zaboboa25-Oct-05 9:39

zaboboa

25-Oct-05 9:39

Thank you.

Windows Forms

Robert M Greene25-Oct-05 3:32

Robert M Greene

25-Oct-05 3:32

Is there a tutorial on the different events and their sequence of firing for a typical windows forms form?

I am curious about comparing the event sequences from MFC to windows forms.

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Disabling Print Screen

memoboy25-Oct-05 3:32

memoboy

25-Oct-05 3:32

i have a problem i need to diasble the print screen in my application.
i have been program my application by using C# language and i need to prevent any user from copying any desplayed image on it.
i have been search alot but i couldnt find any.

i try to learn programming what ever i had i feal that i did'nt get anything

Re: Disabling Print Screen

Wjousts25-Oct-05 4:17

Wjousts

25-Oct-05 4:17

What do you mean by "disable the print screen"? You want to stop people copying text off your application using the clipboard? You want to stop people taking screenshots (in which case, I think you're out of luck!)?

Re: Disabling Print Screen

Dave Kreskowiak25-Oct-05 10:16

Dave Kreskowiak

25-Oct-05 10:16

You can disable print screen keys (PrtScrn and Alt-PrtScrn) by redirecting the hot keys to your applications main window. But there is no way you can't stop another application, like ScreenGrabber, from grabbing the screen, and your graphic images.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Re: Disabling Print Screen

Dan Neely25-Oct-05 10:58

Dan Neely

25-Oct-05 10:58

I thought dvd player apps could prevent 3rd party apps from doing screen grabs. I assume they do it by accessing hardware at a lower level than the win32api provides access to.

Re: Disabling Print Screen

Dave Kreskowiak25-Oct-05 23:04

Dave Kreskowiak

25-Oct-05 23:04

Not really. You're grabbing exactly what you should, the image in the frame buffer. The frame buffer just happens to be blank in the video window. The video you're seeing isn't being shown in this frame buffer, but is an overlay rendered by a different part of the video card.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

registery hot key

memoboy27-Oct-05 3:00

memoboy

27-Oct-05 3:00

you have been mentioned somthing about redirecting the hot key, i have been searched for this solution but i didnt find any thing help full for how to do that with c#. it's ok for me to prevent the people from doing it at least in the easy way, so here i have a new Q how could i use the registry hot key with c#

thanks for help, a little help do alot

i try to learn programming what ever i had i feal that i did'nt get anything

Re: registery hot key

Dave Kreskowiak27-Oct-05 14:45

Dave Kreskowiak

27-Oct-05 14:45

memoboy wrote:
how could i use the registry hot key

????????

What are talking about?

The only thing I have on doing this for PrtScn is in C++, here[^]. I don't know of any C# version of this. From what I've seen in sample code, it should be pretty straight forward to convert some variant of this technique to C#.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Readonly DataRow

PaulaM25-Oct-05 3:14

PaulaM

25-Oct-05 3:14

Im using Visual studio.net 2003 language C#
i want to insert a readonly dataRow in my Datatable(which is bound to the grid)how do i do that?
thanks

regards paula

Re: Readonly DataRow

rudy.net25-Oct-05 19:27

rudy.net

25-Oct-05 19:27

Use the following:

<br />
yourTable.DefaultView.AllowNew = False<br />

Hiding column in DataGrid

zaboboa25-Oct-05 2:43

zaboboa

25-Oct-05 2:43

Hello,

I am trying to hide a certain column in a DataGrid, but to no avail. Here is the part of the code:

<br />
this.dataview.Table.Columns["VersionID"].ColumnMapping = MappingType.Hidden;<br />
this.dataGridCashFlow.DataSource = this.dataview;<br />

Any ideas, why it would not work? Column VersionID still shows up in the DataGrid

Thank you

Re: Hiding column in DataGrid

Wjousts25-Oct-05 3:35

Wjousts

25-Oct-05 3:35

Add a DataGridTableStyle object to your DataGrid and include only the columns you want visible in it's GridColumnStyles collection.

Re: Hiding column in DataGrid

Mossie0125-Oct-05 3:51

Mossie01

25-Oct-05 3:51

use tablestyle and set the column width = 0

***********example of some of the code************
tsGrid.MappingName = "data";

// Add it to the datagrid's TableStyles collection
dgClientView.TableStyles.Add(tsGrid);

// Hide the first column (index 0)
dgClientView.TableStyles[0].GridColumnStyles[0].Width = 0;

Don't know if this is what your looking for?

marcelw

Re: Hiding column in DataGrid

zaboboa25-Oct-05 3:53

zaboboa

25-Oct-05 3:53

Yeah, I did that and it was wroking. (setting the width to 0). I just wanted to know how come the Mapping command did not work.

Thank you very much for the input guys.

Create a Form in constructor

Pixinger7725-Oct-05 2:31

Pixinger77

25-Oct-05 2:31

Hi
I want to create a Form in a constructor (or the load event) like this:

public class Form1
{
private Form fm;

public Form1()
{
fm = new Form();
fm.Show();
}
}

It is important for me to use Show() and not ShowDialog(). The problem is, that the Form is created and displayed, but it does not react on any mouseclick (or move...). When I use the same code from within a Button callback everything works fine. As far as I could figure out by now, there is no Messageloop created in the CTOR or in the Load callback.
So what options do I have?

Thanks in advance

remarks:
The Form1 was created in an extra Thread. This seems to cause the problem. But I need this Thread.
Snow.

-- modified at 9:00 Tuesday 25th October, 2005

Re: Create a Form in constructor

Tom Larsen25-Oct-05 4:34

Tom Larsen

25-Oct-05 4:34

Logically, the problem is that Form1 hasn't been created yet nor is it isn't ready to be a "realized window" and yet you've created another window and tried to realize that. There is simply a mistiming of events in your logic (child window is created and displayed before the parent is created and displayed). I'm not surprised that fm never "appears".

I would seperate these Forms or at the very least move the Show of the child form out of the contructor. You can still "parent" the one form off the other even if they are complete seperated objects. If you still want to agrigate the child form, show it on the Load event. That is my best guess without writing or compiling test code.

Re: Create a Form in constructor

S. Senthil Kumar25-Oct-05 5:01

S. Senthil Kumar

25-Oct-05 5:01

Your only option is to run a message pump on that thread also, using the Application.Run[^] method.

public Form1()
{
   fm = new Form();
   Application.Run(fm);
}

Regards
Senthil
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Status like messenger

Mossie0125-Oct-05 2:24

Mossie01

25-Oct-05 2:24

I need to know where to check for system status? like messenger 'Away' after say 5 minutes. I need to run code when it goes into such a status, and again when it returns to normal.

marcelw

Static Classes

HakunaMatada25-Oct-05 2:04

HakunaMatada

25-Oct-05 2:04

I tried to create static classes but failed. I tried something like,

public static class StaticClass
{
public static int start()
{
return 5;
}
}

but it didn't work. I am using .NET framework 1.1. Can anyone help me!

Bikash Rai

Re: Static Classes

Colin Angus Mackay25-Oct-05 2:22

Colin Angus Mackay

25-Oct-05 2:22

That isn't supported until .NET 2.0

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Re: Static Classes

Tom Larsen25-Oct-05 4:45

Tom Larsen

25-Oct-05 4:45

In 1.1, static is not an object level modifier. Just define all of your functions as static instead and you'll get the effect you desire.

Re: Static Classes

S. Senthil Kumar25-Oct-05 5:09

S. Senthil Kumar

25-Oct-05 5:09

And of course, declare the constructor protected or private to prevent the class from being instantiated by clients.

Regards
Senthil
_____________________________
My Blog | My Articles | WinMacro

Re: Static Classes

Brian Leach25-Oct-05 10:02

Brian Leach

25-Oct-05 10:02

Bikash,

In the 1.1 .NET framework, a static class is a sealed class with a private constructor. I use them all the time.

Your example would look like this:

public sealed class StaticClass {
   private const int start = 5;
 
   private StaticClass() {
      // no constructor allowed
   }

   public static int Start {
      get { return start; }
   }
}

Brian Leach

-- modified at 16:04 Tuesday 25th October, 2005

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