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Only one copy of application allowed to run

Anonymous21-Jul-05 19:13

21-Jul-05 19:13

How can I ensure that only one copy of my application (C#) runs?

(In technical terms - it may mean one process or one thread or something else?)

Thanks

Re: Only one copy of application allowed to run

Andrew Kirillov22-Jul-05 0:27

Andrew Kirillov

22-Jul-05 0:27

Don't you like to search here before ?

You can use mutex for it. There are a lot articles on the topic. Here is one of them [^].

Andrew

Re: Only one copy of application allowed to run

MihirV22-Jul-05 0:40

22-Jul-05 0:40

hi
do this

public static void Main()<br />
{<br />
<br />
System.Diagnostics.Process[] process = <br />
 System.Diagnostics.Process.GetProcessesByName("YourAppName");<br />
<br />
if ( process.Length >= 2 )<br />
{<br />
MessageBox.Show("Application already running..");<br />
Appliction.End();<br />
}<br />
else<br />
{<br />
Application.Run(new Form1());<br />
}<br />
<br />
}

Smile | :)

Mihir...

checking MSWord version

ppp00121-Jul-05 17:59

21-Jul-05 17:59

Hi,

How to check the version of MSWord installed in the pc in C# ?
Any code samples ?

Thanks

How to setup a CDECL callback to C# Delagate

Think RS23221-Jul-05 15:01

21-Jul-05 15:01

I have a Win32 DLL that has a standard _stdcall (WINAPI) exports. I am able to call these fine from C#. One call in particular however has a callback to a CDECL function. How would I set that up? Following is the specific.

Win32 DLL Declaration for function in MyDLL.dll
extern "C" int WINAPI SpecialTimerFunction(int Val, int (*Callback)(int InVal))

C# Declaration
public class MyClass
{
public delegate int MyCallback(int InVal);

[DllImport("MyDLL.dll")]
public static extern int SpecialTimerFunction(int Val,MyCallback Callback);
}

How do I declare the delegate to ensure that the marshaller will understand that the callback is of type CDECL?

Thanks a million.
Berto

WCSC (Willies Computer Software Co)
http://www.wcscnet.com

Re: How to setup a CDECL callback to C# Delagate

leppie21-Jul-05 22:01

21-Jul-05 22:01

Think RS232 wrote:
public delegate int MyCallback(int InVal);

This looks correct.

Define the import function as:
static extern int SpecialTimerFunction(int Val,IntPtr Callback);

When you are creating the delegate wrap it in a GCHandle (pinned). As follows:

GCHandle gch = new GCHandle(new MyCallback(foo), GCHandleType.Pinned);
int res = SpecialTimerFunction(bar, gch.AddressOfPinnedObject());
gch.Free();

^{xacc-ide 0.0.15 now with C#, MSIL, C, XML, ASP.NET, Nemerle, MyXaml and HLSL coloring - Screenshots}

Re: How to setup a CDECL callback to C# Delagate

Think RS23224-Jul-05 3:33

24-Jul-05 3:33

Thanks for the reply.

My concern is that the callback routine in the DLL expects the delagate to be of type CDECL and not _stdcall (WinAPI). Is there some way to specify this?

WCSC (Willies Computer Software Co)
http://www.wcscnet.com

Re: How to setup a CDECL callback to C# Delagate

leppie24-Jul-05 4:21

24-Jul-05 4:21

a delegate to static method should be fine. if that doesnt work, you can try specify the calling convention on the method, not sure if that will help.

^{xacc-ide 0.0.15 now with C#, MSIL, C, XML, ASP.NET, Nemerle, MyXaml and HLSL coloring - Screenshots}

Finding out if Ctrl key is pressed

Luis Alonso Ramos21-Jul-05 14:49

Luis Alonso Ramos

21-Jul-05 14:49

Hello,

I'm trying to implement multiple sort in a ListView control (yes, it will come later to CP as an article) but I can't find out if the Ctrl key is pressed down when I get the ColumnClick event.

In Win32 there's GetKeyState, but what's the equivalent in .NET? Any ideas?

-- LuisR

Luis Alonso Ramos
Intelectix - Chihuahua, Mexico

Not much here: My CP Blog!

Re: Finding out if Ctrl key is pressed

Mike Dimmick22-Jul-05 0:10

22-Jul-05 0:10

For Ctrl, Alt and/or Shift, you can check the Control.ModifierKeys[^] property.

Otherwise I think you're stuck with P/Invoke on GetKeyState.

Stability. What an interesting concept. -- Chris Maunder

Re: Finding out if Ctrl key is pressed

Luis Alonso Ramos22-Jul-05 6:19

Luis Alonso Ramos

22-Jul-05 6:19

Thanks, that will do it! Smile | :)

Smile | :)

-- LuisR

Luis Alonso Ramos
Intelectix - Chihuahua, Mexico

Not much here: My CP Blog!

simultte splitter moving effect

Sasuko21-Jul-05 12:50

21-Jul-05 12:50

If i add to my application a splitter and i try to move, it shows a transparent line following the cursor.
I would simulate this line.
I've to show this line if i click on a panel.
How could i do?

Re: simultte splitter moving effect

malharone21-Jul-05 13:11

21-Jul-05 13:11

Check out http://www.codeproject.com/cs/miscctrl/collapsiblesplitter.asp[^]

Re: simultte splitter moving effect

Sasuko21-Jul-05 13:14

21-Jul-05 13:14

i don't need about it, sorry but i need only to show a semi-transparent line the follows the cursor when i click and move the panel (used as splitter).
Please any suggest?

Re: simultte splitter moving effect

malharone21-Jul-05 13:21

21-Jul-05 13:21

Oh .. sorry misunderstood your qstn. Though I don't have much experience in System.Graphics, you'll have to manually implement the drawing with brush/lines.

Picture-strange

nc3b21-Jul-05 12:25

21-Jul-05 12:25

I have a problem.. a strange problem.. a have an application with a picture box.. when i build it everithing is perfect.. so i build it, and i make a copy of the program, and move it to some other folder.. when i run my application, the picture looks really bad.. can anyone help? pls.. Smile | :)

Smile | :)

Re: Picture-strange

Member 177347421-Jul-05 12:46

21-Jul-05 12:46

What dou you mean by looking really bad?.

Re: Picture-strange

nc3b21-Jul-05 12:51

21-Jul-05 12:51

I mean that other colors appear instead of the ones that were supost to.. and the contours are smudged... the really strange thing is, that if i keep the debug folder opened the picture displays correctlky (it's a picture on a form that loads on startup

Re: Picture-strange

malharone21-Jul-05 13:09

21-Jul-05 13:09

I think you specified the value of the picturebox image at design time. Instead of that, load and set your image at run time. this will retain the quality.

- Malhar

Re: Picture-strange

nc3b21-Jul-05 13:14

21-Jul-05 13:14

OK

Smile | :)

Now, supose i don't want anybody to be able to mofify my picture, what should i do? Smile | :)

Smile | :)

Hope i'm not bugging you too much Big Grin | :-D

Big Grin | :-D

Smile | :)

Re: Picture-strange

malharone21-Jul-05 13:18

21-Jul-05 13:18

Rename .jpg to .dll ..!!!! Just kidding!!
You can embed the image as a project resource by making image part of the project and extract the image just as you were accessing file.

System.Reflection.Assembly asm = GetType().Assembly;
StreamReader stream = new StreamReader(asm.GetManifestResourceStream("FULLY_QUALIFIED_NAMESPACE.FileName.jpg"));

Re: Picture-strange

nc3b21-Jul-05 21:32

21-Jul-05 21:32

Smile | :)

Thank you very much Smile | :)

Smile | :)

. Hope I'll get it right( Smile | :)

Smile | :)

)) )

Re: Picture-strange

nc3b22-Jul-05 6:58

22-Jul-05 6:58

Cry | :((

i still can't make that picturebox look good... i managed to embed it, and now i set it's value at run-time.. pls help Smile | :)

Smile | :)

Re: Picture-strange

malharone22-Jul-05 7:09

22-Jul-05 7:09

Huh .. strange .. is it a very large or a high-DPI picture? I can certainly give it a try if you dont mind uploading the image.

Re: Picture-strange

nc3b22-Jul-05 7:18

22-Jul-05 7:18

It's not a large picture... it's quite simple... here-s a link http://www.firefly.go.ro/sn.png[^]

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