Assign Mutex to each Thread - C# Discussion Boards

Want to chat through ip address

25-May-13 22:46

i added a registry key to regedit to auto start my app on startup
when the session open and the app start it crash on start
in the debugger it says it cant find the complete path
for a sepcific txt file it is suposed to read

when lunching the app in any other way the app works
just fine and can read said textfile easily

the text file is located in a parent folder

any idea on what could cause this

Re: very off bug

SoMad25-May-13 23:36

SoMad

25-May-13 23:36

It sounds like you implemented this expecting the current folder of the process to always be the folder where the application is located (e.g. "C:\Program Files\MyApps\MyNewApp\NewApp.exe" with the txt file located in "C:\Program Files\MyApps"), however when you launch an application by just specifying the full path, the current folder is not changed - since this happens during startup, the current folder for your process is most likely C:\.

There are several ways to make this work, here are a couple off the top of my head:
1) Change the code to accept the file name (with full path) as a command line parameter and pass that when you are starting it up through the registry.
2) Change the code to properly locate the txt file by having that location set in the registry.
3) Change the code to check the location of the process executable file and use that to locate your parent folder.
4) Don't make any changes in the code. Instead create a Windows shortcut and in the shortcut properties specify the startup folder for your application. On system startup, invoke the shortcut instead of launching your application directly.

I am not advocating that you go with 4), but I included it to give you some options.

Soren Madsen

"When you don't know what you're doing it's best to do it quickly" - Jase #DuckDynasty

Ramans44425-May-13 21:24

Ramans444

25-May-13 21:24

I want to connect two pc through ip address and start chat with one to another like my pc and my friend pc having no physical connect except they are connect through internet
can any one help ??? Using c# and socket programming

Re: Want to chat through ip address

harold aptroot25-May-13 21:30

harold aptroot

25-May-13 21:30

You will probably have to traverse NAT at some point, so look into how to do that.
Apart from that, it's much the same as on a LAN.

Re: Want to chat through ip address

Ramans44425-May-13 21:40

Ramans444

25-May-13 21:40

Can u explain it further?

Re: Want to chat through ip address

dusty_dex26-May-13 0:57

dusty_dex

26-May-13 0:57

There are plenty of chat server/client examples on the web.

Try googling chat server/client example

Assign Mutex to each Thread

RoyDoron25-May-13 5:28

RoyDoron

25-May-13 5:28

Hello,

I have a function, and i would like to let a list/array of Threads run parallel in it (inorder to protect critical sections in it).

I thought I'd create List<mutex> and assign each one to a different Thread:

for( int i =0; i<10; i++)
{ arrmutex[i] = new mutex(); }

and in the function i would like to lock with a

arrmutex.elementAt(someThread).waitOne()

-> a specific variable

It tells me that i cannot do that cause my mutex list is not initialize, AND, the lock wouldn't work..

Can you please help me figure out, how to initialize a list/array of mutexes?

and how to assign each thread a mutex?

Thanks,

Re: Assign Mutex to each Thread

Dave Kreskowiak25-May-13 14:08

Dave Kreskowiak

25-May-13 14:08

Why us a Mutex?? Are you trying to synchronize an operation between processes??

What exactly are you trying to do with this set of mutexes??

Should you be using a ManualResetEvent instead??

A guide to posting questions on CodeProject[^]

Dave Kreskowiak

c# question about gui standard location on every screen

User349025-May-13 4:55

User3490

25-May-13 4:55

hi
I have a question about forms in c#.

every time i run the program on a different laptops with different size of screen the items that have the forms have not be in the same location that i have put it the first time on my laptop.

how can i make the appearance of the items that have the different forms to be to the same location on every laptop or pc i run my program?
can i make it parametric?

thnx

Re: c# question about gui standard location on every screen

Abhinav S25-May-13 5:08

25-May-13 5:08

Using Dock and Anchor properties will help you out.
For more information, go through, Manage WinForm controls using the Anchor and Dock properties[^].

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int to string

Member 1007416125-May-13 1:17

25-May-13 1:17

im trying to remove a tab page from my tabcontrol

based on its tab index

but i have the tab index in an int

heres the code

if (e.Button == MouseButtons.Right)
          {
              for (int i = 0; i < tabControl1.TabCount; i++)
              {
                  Rectangle r = tabControl1.GetTabRect(i);
                  if (r.Contains(e.Location))
                  {
                    //  MessageBox.Show("TabPressed: " + i);

                      if (i == 0)
                      {


                      }
                      else
                      {
                          string tabindexint = i.ToString();

                          tabControl1.TabPages.Remove(i);

it wont let me use an interger as a tab index how could i possibly do this

Richard MacCutchan25-May-13 1:25

Richard MacCutchan

25-May-13 1:25

Check the http://msdn.microsoft.com/en-us/library/system.windows.forms.tabcontrol.tabpagecollection.remove.aspx[^] sample.

Use the best guess

Abhinav S25-May-13 1:26

25-May-13 1:26

The TabPages.Remove() method expects a TabPage elment as a parameter[^].
Pass the tabPage instead of an integer or string.

You can go through http://msdn.microsoft.com/en-us/library/zb7xae05.aspx[^] to get a solution.

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Member 1007416125-May-13 1:48

25-May-13 1:48

I REALY need to use the int tho because thats how i get
that selected tab name since its a right click selection
not a left click selection u can see it in the code

Abhinav S25-May-13 2:19

25-May-13 2:19

Try RemoveAt() - myTabControl.TabPages.RemoveAt(i);

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Member 1007416125-May-13 3:07

25-May-13 3:07

thx and how do i get the page name of a tab based on is index

like what is the name of tab at index 4

Abhinav S25-May-13 3:27

25-May-13 3:27

Try something like

for (int i = tabControl1.TabPages.Count - 1; i >= 0; i--) {
  if (tabControl1.TabPages[i].Text == "Header")
      //i becomes index - do whatever
}

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Member 1007416125-May-13 3:51

25-May-13 3:51

i got it to work using this
string tabpagenamex = tabControl1.TabPages[i].Name;

can u explain what the [] part means to tabpages

Dave Kreskowiak25-May-13 4:06

Dave Kreskowiak

25-May-13 4:06

It means absolutely nothing to TabPage.

It means everything in C# because that's an array you're indexing into.

If you didn't know this, you REALLY need to pickup a beginners book on C# and work through it. Arrays are something you learn about in the 1st or 2nd week of an intro to programming class.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak

Abhinav S25-May-13 5:06

25-May-13 5:06

[] basically accesses an array item.
As mentioned, it might be useful for you to catch up on some basics.

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Member 1007416125-May-13 7:09

25-May-13 7:09

definitly ive only been doing any sorts of coding for two months

im learning as i go still most of it is uncomprensible
but i think im doing prety considering my lack of prior
knowledge

Abhinav S25-May-13 9:16