Re: Run the application once - C# Discussion Boards

sarang_k14-Dec-11 3:07

14-Dec-11 3:07

Hi all,

I have created one windows setup application,when i installed it on the system if i click two times the application is running two times as it should run once.

How can i solve it ?

Thanks in advance.

Re: Run the application once

Wayne Gaylard14-Dec-11 3:26

Wayne Gaylard

14-Dec-11 3:26

You should run your app using the Mutex class, something like this:-

bool isNew = true;
using (Mutex mutex = new Mutex(true, "yourAppName", out isNew))
{
    if (isNew)
    {
        Application.Run(new MainForm());
    }
}

If the app is aplready running and you would like it to be given focus you need to use a Win32 API method called SetForegroundWindow which I'm sure you could find an instance of on Google.

Hope this helps

When I was a coder, we worked on algorithms. Today, we memorize APIs for countless libraries — those libraries have the algorithms - Eric Allman

Re: Run the application once

BobJanova14-Dec-11 3:43

BobJanova

14-Dec-11 3:43

I didn't know about this. Very handy.

Re: Run the application once

Wayne Gaylard14-Dec-11 3:52

Wayne Gaylard

14-Dec-11 3:52

Thanks!

When I was a coder, we worked on algorithms. Today, we memorize APIs for countless libraries — those libraries have the algorithms - Eric Allman

Re: Run the application once

thatraja14-Dec-11 4:23

thatraja

14-Dec-11 4:23

Here 5+ alternatives
Run Only One Copy Of Application[^]

thatraja

My Dad had a Heart Attack on this day so don't...
Pompeyboy3 here | Nobody remains a virgin, Life screws everyone Sigh | :sigh:

Re: Run the application once

Luc Pattyn14-Dec-11 9:26

Luc Pattyn

14-Dec-11 9:26

WARNING: all the schemes that have been mentioned to you do not prevent the app from launching a second or third time; all they do is try and make the app terminate pretty soon if it isn't the first instance.

Smile | :)

Luc Pattyn [My Articles] Nil Volentibus Arduum

Re: Run the application once

BillWoodruff14-Dec-11 22:13

BillWoodruff

14-Dec-11 22:13

Luc Pattyn wrote:
all the schemes that have been mentioned to you do not prevent the app from launching a second or third time

Even the one from Wayne G. using a Mutex ?

thanks, Bill

When I consider the brief span of my life, swallowed up in the eternity before and after, the little space which I fill, and even can see, engulfed in the infinite immensity of spaces of which I am ignorant, and which knows me not, I am frightened, and am astonished at being here rather than there; for there is no reason why here rather than there, now rather than then.

Blaise Pascal

Re: Run the application once

Pete O'Hanlon14-Dec-11 22:15

Pete O'Hanlon

14-Dec-11 22:15

It still has to start to detect that there's another instance running. It's not that they don't stop the appearance of an app not being started again, but there will always be a finite period of time where the second instance has spun up - even if it then terminates.

Forgive your enemies - it messes with their heads

"Mind bleach! Send me mind bleach!" - Nagy Vilmos

My blog | My articles | MoXAML PowerToys | Mole 2010 - debugging made easier - my favourite utility

Re: Run the application once

BillWoodruff14-Dec-11 22:13

BillWoodruff

14-Dec-11 22:13

CP has many articles on making a "Singleton" app:[^]

When I consider the brief span of my life, swallowed up in the eternity before and after, the little space which I fill, and even can see, engulfed in the infinite immensity of spaces of which I am ignorant, and which knows me not, I am frightened, and am astonished at being here rather than there; for there is no reason why here rather than there, now rather than then.

Blaise Pascal

Use the environment provided by the application instead from system environment.

Member 848801414-Dec-11 1:35

Member 8488014

14-Dec-11 1:35

How to tell the OS to use the environment provided by the WinForm application instead from system environment.

Example : My WinForm application uses C++ runtime dll's(msvcm80.dll, msvcp80.dll and msvcr80.dll) and bundling them as part of the application. How to make sure that my application will use the C++ runtime dll's that bundled along with product even though the dll's present else where in the system(c:\Windows\Winsxs).

Regards,
Gopal Reddy

Re: Use the environment provided by the application instead from system environment.

PIEBALDconsult14-Dec-11 1:45

PIEBALDconsult

14-Dec-11 1:45

I suppose you would have to load them yourself.

http://msdn.microsoft.com/en-us/library/h538bck7.aspx[^]

Re: Use the environment provided by the application instead from system environment.

Shameel14-Dec-11 2:02

Shameel

14-Dec-11 2:02

Posting this question in the C++ forum can help you get more answers.

Display a menu in context menu

sarang_k14-Dec-11 0:00

sarang_k

14-Dec-11 0:00

Hi all,

I have created one windows application setup.Now i want to display mt application shortcut in the menu that is when i left click on the file it should display the application name in the menu.

How can i do it ?

Thanks in advance.

Re: Display a menu in context menu

BillWoodruff14-Dec-11 2:48

BillWoodruff

14-Dec-11 2:48

Are you asking how to create a file association, so that when you are on the Desktop, or in a Windows Explorer window, and you context-click on a file whose type is the type you have associated: then you want the Windows system context menu to appear with the name of your application under the "Open With" sub-menu ?

Have you set the left mouse button to be the context-click button ?

When I consider the brief span of my life, swallowed up in the eternity before and after, the little space which I fill, and even can see, engulfed in the infinite immensity of spaces of which I am ignorant, and which knows me not, I am frightened, and am astonished at being here rather than there; for there is no reason why here rather than there, now rather than then.

Blaise Pascal

How I can Show the Value of Textbox in another form in C sharp?

ishaq shinwari13-Dec-11 21:25

ishaq shinwari

13-Dec-11 21:25

Hi,
I have a textbox, and i want to show the value of this textbox in another window form?
Any one can help me?

Thanks!

Re: How I can Show the Value of Textbox in another form in C sharp?

Pete O'Hanlon13-Dec-11 21:37

Pete O'Hanlon

13-Dec-11 21:37

Is this other form open already? Do you want the value to be displayed when the user clicks a button, or is it to be updated as the user types? You need to provide more information before anyone can offer useful help.

Forgive your enemies - it messes with their heads

"Mind bleach! Send me mind bleach!" - Nagy Vilmos

My blog | My articles | MoXAML PowerToys | Mole 2010 - debugging made easier - my favourite utility

Re: How I can Show the Value of Textbox in another form in C sharp?

ishaq shinwari13-Dec-11 22:26

ishaq shinwari

13-Dec-11 22:26

Yes, this form is already open, I wants to link it with this. And i want to open the this by button click,

Re: How I can Show the Value of Textbox in another form in C sharp?

Pete O'Hanlon13-Dec-11 23:01

Pete O'Hanlon

13-Dec-11 23:01

The common way to do this is to have an event in your code that looks something like this:

public event EventHandler<string> MyText;

protected void OnMyTextChanged()
{
  EventHandler<string> handler = MyText;
  if (handler == null)
  {
    return;
  }
  handler(this, new TextChangedEventArgs(textBox.Text));
}

Then, all you need do is subscribe to the event in the second form, and it will automatically receive the string whenever you raise this event (which you would trigger from your button click event). Note that TextChangedEventArgs is a custom event args class defined like this:

public class TextChangedEventArgs : EventArgs
{
  public TextChangedEventArgs(string text) : base()
  {
    MyText = text;
  }
  public string MyText { get; private set; }
}

Forgive your enemies - it messes with their heads

"Mind bleach! Send me mind bleach!" - Nagy Vilmos

My blog | My articles | MoXAML PowerToys | Mole 2010 - debugging made easier - my favourite utility

Re: How I can Show the Value of Textbox in another form in C sharp?

Varun Sareen13-Dec-11 23:12

Varun Sareen

13-Dec-11 23:12

Use the customeventhandler functionality of .net

Varun Sareen (Dot Net Developer)

PLD's quastion (storage binding)

desatir731613-Dec-11 20:48

desatir7316

13-Dec-11 20:48

hi can someone help me about storage binding in string type?
I need a rich answer
thanks so much

Re: PLD's quastion (storage binding)

Pete O'Hanlon13-Dec-11 21:51

Pete O'Hanlon

13-Dec-11 21:51

What? I'm sorry, but your question makes no sense to me whatsoever. Could you clarify what it is that you are asking?

Forgive your enemies - it messes with their heads

"Mind bleach! Send me mind bleach!" - Nagy Vilmos

My blog | My articles | MoXAML PowerToys | Mole 2010 - debugging made easier - my favourite utility

Re: PLD's quastion (storage binding)

jan lucas13-Dec-11 23:05

jan lucas

13-Dec-11 23:05

Could you define:
1. PLD
2. Storage binding
3. rich answer
thanks

My logic is impeccable; my arithmetic lets me down.

Re: PLD's quastion (storage binding)

Deborah Palmer McCain14-Dec-11 10:35

Deborah Palmer McCain

14-Dec-11 10:35

You are probably going to find your definitions (as well as examples) if you access MSDN.

VS 2010 No method to override error

Deborah Palmer McCain13-Dec-11 14:23

Deborah Palmer McCain

13-Dec-11 14:23

// CS0115.cs
namespace MyNamespace
{
    abstract public class MyClass1
    {
        public abstract int f();
    }

    abstract public class MyClass2
    {
        public override int f()   // CS0115
        {
            return 0;
        }

        public static void Main()
        {
        }
    }
}

After reducing errors to 1, I received the error (named in the Subject line) on line 14 of my project "No method to override". The problem is, Line 14 is blank.
When I went to MSDN, I found CS0115, but I don't know how to change it to work with my project. Should this be simple deduction and logical? Any help would be appreciated.

Re: VS 2010 No method to override error

PIEBALDconsult13-Dec-11 15:27

PIEBALDconsult

13-Dec-11 15:27

Perhaps you forgot to tell the compiler that MyClass2 is supposed to derive from MyClass1?

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