C / C++ / MFC Discussion Boards

Re: Reading a comma delimited file to array

Jeffrey Webster13-Feb-13 20:25

Jeffrey Webster

13-Feb-13 20:25

Hi,
Thanks for the reply.
As far as I can see that's what I have except without the assignment to the array:

str2[j][l]=k

but that is basically what I'm trying to accomplish. The printing at the end is just to confirm that the file was successfully written to the array.

Re: Reading a comma delimited file to array

Graham Breach13-Feb-13 21:33

Graham Breach

13-Feb-13 21:33

Replace the double-quotes in your comparison with single-quotes. In C and C++, double-quotes mean a pointer to a string of characters, but single-quotes mean a character literal.

Re: Reading a comma delimited file to array

Jeffrey Webster14-Feb-13 4:15

Jeffrey Webster

14-Feb-13 4:15

Hi, thanks for your response. That helped. I also changed the control in the inside printf loop to

for(l=0;*(str2[j]+l);l++)

Now it's compiling with no warnings and is reading back pretty good text, though there is some stray characters after some of the words in the test text.

Re: Reading a comma delimited file to array

Richard MacCutchan13-Feb-13 22:17

Richard MacCutchan

13-Feb-13 22:17

Why are you making life so complicated for yourself? Use a tokeniser such as strtok()[^].

Re: Reading a comma delimited file to array

Jeffrey Webster14-Feb-13 4:21

Jeffrey Webster

14-Feb-13 4:21

Thanks Richard,
I'm going to try to track down the errors in this code first and then experiment with this tokenizer. At this point I'm trying to get a really granular understanding of C which even means reinventing the wheel at times, just for my own edification Smile | :)

Re: Reading a comma delimited file to array

Richard MacCutchan14-Feb-13 5:14

Richard MacCutchan

14-Feb-13 5:14

Just glancing at your code I would suggest using proper names for variables. Also, read up on the difference between a character and a string.

Re: Reading a comma delimited file to array

Jeffrey Webster14-Feb-13 9:23

Jeffrey Webster

14-Feb-13 9:23

Thanks.
This is just a test of concept program so I'm not doing 'real' variable names. As a former VB person I'm still in the CCAC (code cuss and cry) phase of learning C Smile | :)

modified 14-Feb-13 16:13pm.

Re: Reading a comma delimited file to array

David Crow14-Feb-13 5:14

David Crow

14-Feb-13 5:14

Jeffrey Webster wrote:
At this point I'm trying to get a really granular understanding of C which even means reinventing the wheel at times, just for my own edification

A good strategy. Thumbs Up | :thumbsup:

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Implementing of Interruption

mohammad torabi13-Feb-13 10:14

mohammad torabi

13-Feb-13 10:14

Assume that there are 8 Modules which one of them is Supervisor. They are implemented in C++ classes, so we have 1 Object of Supervisor and more than one Object of other module.

The Supervisor assign Tasks to each other module, and whenever they finished their tasks or faced with a problem, they should inform the Supervisor.

I think that the best way to implement this behavior is Interruption or something like that.

Now, I want to know how to implement it or is there any solution for this problem?

Re: Implementing of Interruption

Albert Holguin13-Feb-13 11:49

Albert Holguin

13-Feb-13 11:49

Messaging[^] suits this well and is the native Windows way of handling such tasks... but I'm sure there are many options.

Re: Implementing of Interruption

Stefan_Lang15-Feb-13 3:39

Stefan_Lang

15-Feb-13 3:39

Using interrupts is something you do when your program needs to interact with hardware components that trigger these interrupts. Software can trigger only one type of interrupt, and that is by setting a timer. Your problem is not timed, it is controlled by demand, so setting a timer does not fit that problem. using a timer in this situation is like telling a home owner that instead of reacting to the door bell, he should rather check the door every 5 minutes.

I suggest you fire up your preferred search engine and search for the keywords "master slave pattern". This should provide you with lots of interesting links.

The master slave pattern is extensively used for organizing the parallelization of complex tasks. Each slave works (potentially) on its own thread, allowing it to work in parallel with its coworkers. That means telling a slave to work requires sending a message to a different thread or process. Since inter-process communication is rather slow, you should prefer the former.

In most cases it is not necessary for the slaves to live beyond the scope of their tasks. Therefore, the easiest way is to create a new thread for each slave, whenever you need one. The problem you describe assumes a fixed number of slaves however, implying that these slaves' livetimes are not linked to the tasks they work on.

In that case you need a messaging system that allows the supervisor to inform the slaves if and when they are needed, and the slaves to inform the master after they're done. The windows messaging system - as suggested above - should work well for that purpose.

The disadvantage of messages is that the master needs to keep track which of his slaves are busy. Also he'll need to queue the tasks if all slaves are busy, until one becomes available.

Since you need the ability to queue your tasks anyway, a better solution would be to just push your tasks there, always, and let your slaves pick up work items from there whenever they're idle. That way the master doesn't need to know if or who is available for work. He wouldn't even need to be informed every time a slave is done with his work item; instead, the queue could notify him when it is empty, i. e. the entire workload completed.

The only reason not to do that would be if your slaves are specialized to different tasks, but not able to decide for themselves which these are. (e. g. this may happen when the data associated with the tasks come in different formats that the slaves cannot interpret)

Re: Implementing of Interruption

Shaheed Legion26-Feb-13 5:33

Shaheed Legion

26-Feb-13 5:33

Hi, you need too Google the "Observer Pattern" to see a very well explained answer to your question. Hope this helps.

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Line number Add-in

Krishnakumartg13-Feb-13 5:20

Krishnakumartg

13-Feb-13 5:20

Hi,

I have an idea to develop one MSDEV (VC6) addin that shows the line numbers in editor (like the VS2008 IDE).

Could you please give me the basic idea that I should follow (i mean how to modify the existing editor window)?

Krishnakumar TG

Re: Line number Add-in

Maximilien13-Feb-13 8:14

Maximilien

13-Feb-13 8:14

Krishnakumartg wrote:
I have an idea to develop one MSDEV (VC6) addin

Why, oh, why do you want to do an add-in for an antiquated IDE ?

Confused | :confused:

Nihil obstat

Re: Line number Add-in

Albert Holguin13-Feb-13 8:59

Albert Holguin

13-Feb-13 8:59

I agree with the previous post... why would you want to develop something new for something so old? D'Oh! | :doh:

If you just want a project, I'm sure you can find other more useful and productive things to work on. Line numbers are hardly ever useful either, I've never had the need for them (I guess if you're having a need to discuss a file with another coder they'd be useful but I've never needed them).

Re: Line number Add-in

jschell13-Feb-13 10:12

jschell

13-Feb-13 10:12

Krishnakumartg wrote:
Could you please give me the basic idea that I should follow (i mean how to
modify the existing editor window)?

Have you already researched whether that VS supported Addins at all?

If it does then finding examples would be one way to approach it.

Combine two windows

Krishnakumartg13-Feb-13 5:16

Krishnakumartg

13-Feb-13 5:16

Hi,

I am trying to prepare a test application that combines two windows. I visualize that if one window is dragged, the other one also drags automatically.

For this,
1. I created a dialog based app
2. In button click created a new window (other than dialog apps window). And the new window is attached with the dialog apps window.

But after the button click whole the app hangs. Unable to touch the windows.

The code is as follows. Could you please help?

C++

CWnd NewWindow;
void CAttachDlg::OnButton1() 
{
	CRect crect( 0, 0, 500, 500 );
	RECT rect;
	rect.left = 0;
	rect.top = 0;
	rect.right = 100;
	rect.bottom = 100;
	CString csClassName = AfxRegisterWndClass( 0 );
	
	BOOL bReturn = NewWindow.Create( csClassName, "Test", WS_POPUP | WS_VISIBLE, crect, this, 0 );
	RECT wRECT;
	GetWindowRect( &wRECT );
	wRECT.right = wRECT.left - 1;
	wRECT.left = wRECT.left - 100;

	NewWindow.MoveWindow( &wRECT, TRUE );
	this->Attach( NewWindow.operator HWND());
}

Krishnakumar TG

Re: Combine two windows

prabhjot.cgc13-Feb-13 17:29

prabhjot.cgc

13-Feb-13 17:29

Hello Krishnakumartg,

Use CreateEx method insted of Create. Because WS_POPUP cannot be used with the Create method.

Member 983250613-Feb-13 2:39

Member 9832506

13-Feb-13 2:39

How to shut down computer using c programming?

Re: c

Orjan Westin13-Feb-13 2:49

Orjan Westin

13-Feb-13 2:49

By calling the appropriate OS API, if any, if you are permitted.

Re: c

Matthew Faithfull13-Feb-13 2:51

Matthew Faithfull

13-Feb-13 2:51

Basically two ways to do this that I know of:

1. Make a call from your C code to the Operating System API for shutdown. Which API call, what permissions you need and what options you have depends on the Operating System.

2. Break out the books and learn to make ACPI BIOS calls, probably more assembler than C. This will do it fast and sure but you may corrupt your OS and will certianly loose any unsaved data if you go this way.

"The secret of happiness is freedom, and the secret of freedom, courage."
Thucydides (B.C. 460-400)

Re: c

Richard MacCutchan13-Feb-13 3:22

Richard MacCutchan

13-Feb-13 3:22

See http://msdn.microsoft.com/en-us/library/windows/desktop/aa376876(v=vs.85).aspx[^].

Ribbon To existing MFC Application

002comp12-Feb-13 19:53

002comp

12-Feb-13 19:53

Hello Friends
I am going to add Ribbon Toolbar in My Existing MFC application. As i go through on net,i found that in VS2010,we can create Ribbon Resource using Ribbon Designer Inspite of using Ribbon Classes to create Ribbon Toolbar.

Now, I am using VS2010. I want to know How can I Add Ribbon toolbar to my application which is using old toolbars. Do I need to create Ribbon Resource Independently and then to load in Exisitng Application Or Some other Way to DO it?
Any Help Will be Appreciated.I want to in Right way when I update to Ribbon toolbar.

Thanks In Advance.
Regards
Y

Re: Ribbon To existing MFC Application

Richard MacCutchan12-Feb-13 22:17

Richard MacCutchan

12-Feb-13 22:17

Take a look at some of these articles[^].

CAsyncSocket exception

ForNow12-Feb-13 19:47

ForNow

12-Feb-13 19:47

Hi,

I have a derived CAsyncSoct class as a member of a Derived CwinThread Class
the members that I have in my derived CAsynSocket class include data members such as a port no
that I wish to connect to

so...

class CSocketThread : public CwinThread
{
public
CSocket thisicket

}

class CSocket : public CAsynSocket
{

I create a UI thread

via new SockThread(start_port)

I create the thread suspended

fill in the missing pieces such the ipaddr, port #

Then do a resumethread this should kick the SockThread:Iinitinstance overridable

I figure by this time everthing the SockThread and Csocket Objects has been Created

So in the SOckThread::initinstance I do a Socket.create withe yhe ipaddr and port

By the time i get to create the third of fourth thread I get an exceptin from

CAsynSocket::Create

One of my questons is if I create the SockThread on the heap via new does that mean
every data memeber and or classes such the CSocket is contructed on the heap

and is there something wrong with my design

Thanks in advance

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