How to make XSleep() function execute untill i click on any button?

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How to make XSleep()function continue execution untill i click on the button.

Is there any other funtion that sleep untill an event occurs?

when XSleep is used XSleep(1000);
i stops execution for 1000 milliseconds.

Instead of giving a value the Execution should stop for time untill I do OnClick operstion on a button.

C++

void CDemoDlg::OnBnClickedSongPlay2()
{
	
if(PauseFlag==true)
{
	int i=0;bool b=true;
	while(b)
	{
		i++;
		XSleep(i++);
// some code to be written for any event occurs so i can make b=false;
		
	}

		
	}
	else
	{
		PauseFlag=true;
	return;
	}
}

In the above code it pauses and never resume please correct this code to resume it.

Posted 14-Mar-12 0:51am

chaiein

Updated 14-Mar-12 2:15am

v4

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Jochen Arndt · Answer 1 · 2012-03-14T01:43:00

Solution 1

Using sleep() should be avoided. I did not had a look at the XSleep() source, but it seems to avoid some of the disadvantages of the sleep function.

The usual way is to use WaitForSingleObject() with an event. If you tell us about the context where you want to use sleep(), we may find a solution to avoid it.

[UPDATE according to update question]
One solution may be terminating the thread created by XSleep(). This requires modification of the XSleep() source by adding code to terminate upon a specific message (e.g. the BN_CLICKED notfication of your button).

A better solution would be a proper design. I understand that you are playing audio and want to provide a pause and resume option. Then stop playing upon pause, and save the actual play position. Upon resume, start playing at the stored position. Such a design avoids the usage of sleep commands.
[UPDATE]

Posted 14-Mar-12 1:43am

Jochen Arndt

Updated 14-Mar-12 2:41am

v2

Comments

chaiein 15-Mar-12 23:55pm

for file type of CStdioFile to find the position where it stops getPositon() is used but the seek fails during execution. the getPosition is giving a wrong value.

Jochen Arndt 16-Mar-12 3:45am

Without knowing what you are doing, I can't help you.

chaiein 16-Mar-12 5:05am

I am reading each character from text file and displaying the letters when i click on button it should stop there and when again when i click that button it should continue from where it paused.

Jochen Arndt 16-Mar-12 5:26am

OK. To catch events during such operations, the professional solution is to use a thread for reading.
But you may use a simple solution here: From within the pause button handler, set the PauseFlag member variable, and from within the resume button handler clear it. You should also add a stop variable as member var that is set when the stop / cancel button is activated. The XSleep() function will process messages like the BN_CLICKED notifications from the buttons. The main loop may then look like this:
while (!bStop)
{
if (!bPauseFlag)
ProcessChar();
XSleep(DELAY_TIME);
}
EndDialog(IDCANCEL);
This requires that OnCancel() and OnOK() does not close the dialog immediately when playing is active:
void CMyDialog()::OnCancel()
{
if (bIsPlaying)
bStop = true;
else
CDialog::OnCancel();
}

chaiein 16-Mar-12 6:29am

ProcessChar() has the ReadFileTxt() which gives me warning!!

ReadFileTxt every time called will open the file when i give pause it exits with out closing and when i click pause again and goes to else loop(placed resume code)when ever file opens it starts from first character. First of all it tries to open gives a warning because its already open.

And what does DELAY_TIME contain?

Jochen Arndt 16-Mar-12 6:57am

ProcessChar() is a place holder for a function to read and process one character from the opened text file. DELAY_TIME is a place holder for a delay time between reading two characters (which may be zero). The code snippet is not intended to be a working one. It's just to show the principle of execution flow. I did not know your code, so I can't give you code that works out of the box. But before posting more from your code, try to solve it yourself. You won't learn when most of your code is finally based on answers from here. Especially in this case, it may be better to have a complete new approach. The first step should be always the creation of an abstract execution flow (pseudo code). While doing this, always have in mind if and how this may be realized using your programming language and APIs. When this is done, start implementing it using real code. Don't start creating code when you did not know how to implement a specific step. Otherwise, you will stick at some point, or end up with ugly hacks, and must finally decide to throw it all way and begin again.

chaiein 16-Mar-12 6:59am

XSleep should continue untill i give resume what should i do? or i will give XSleep to some high value and break the XSleep Execution when i resume.

So now How to break Xsleep execution?

If i am Wrong please correct me.

Jochen Arndt 16-Mar-12 7:05am

So you don't want to redesign, but modify the existing code until it does what you want. To do that what you want, you need an additional thread. Fortunately, XSleep() uses a thread. Just modify the XSleep code to terminate upon specific messages (as I wrote on the first sentence of my updated answer) and pass a infinite time to the XSleep() call.

chaiein 16-Mar-12 7:17am

I am modifying the code already I will try if not that then Xsleep. I will get back with results or doubts again and thank you once again :)