C / C++ / MFC

Re: any solution for WSAETIMEDOUT for CAsynSocket::OnConnect

22 May '13 - 21:02

Don't try solving a problem that may not exist. The first thing you need to do is investigate why the timeout is occurring. Use the best guess
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ForNow

23 May '13 - 4:32

My computer has gotten a lot slower since I have gotten it

<a href="http://support.microsoft.com/kb/170359">http://support.microsoft.com/kb/170359</a>[<a href="http://support.microsoft.com/kb/170359" target="_blank" title="New Window">^</a>]

I tried Microsoft knowledge base 170359 to resolve the problem upping the time out times but didn't seem to work

I am thinking of re-installing windows to get the computer back to speed

source code sudoku c

Member 10069426

22 May '13 - 3:54

does anyone have the source code of sudoku?, but that requires us to input numbers and and using C
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Re: source code sudoku c

C^hris L^osinger

22 May '13 - 4:16

yes, somebody probably does image processing toolkits \| batch image processing
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Re: source code sudoku c

CPallini

22 May '13 - 22:54

Definitely. Veni, vidi, vici.
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C++ Syntax failure ?

Engeltje

22 May '13 - 3:40

Can anyone explain me why the following C++ snippet does compile and not end up in a compiler error ?

int main()
{
  double d;
  d = 0,2;      // WHY IS THIS NOT A COMPILER ERROR ?

  return 0;
}

I would expect the double assignment should be

  double d;
  d = 0.2;

Because I couldn't believe it, I tried VisualStudio 2010, -2005 AND -6, all three compiled with 0 errors, 0 warnings...

Re: C++ Syntax failure ?

Jochen Arndt

22 May '13 - 4:11

See the C comma operator[^]
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Re: C++ Syntax failure ?

Engeltje

22 May '13 - 4:25

How simple can it be... Thank you Jochen. And thanks to CppCheck for finding the mistake! (see cppcheck.sourceforge.net)
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error handling in c++ dll

venkatesh52867

21 May '13 - 19:39

Hi, I have one function which is return string array in my C++ dll .from this function how can return error .please help me . Thanks
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Re: error handling in c++ dll

21 May '13 - 21:05

venkatesh52867 wrote: how can return error Use `SetLastError()` to set some unique error code, and return `NULL` instead of a valid pointer. Use the best guess
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MFC SetTimer() question

21 May '13 - 7:13

In a dialog, WM_PAINT message handler, I set a timer.

void CXYZDlg::OnPaint()
{... SetTimer(12, 2500, NULL);}

in the OnTimer(),I found I have to set it again, then it goes into
the breakpoint in OnTimer() repeatedly. otherwise, it only goes into the OnTimer() function once.

<pre lang="c++">void CXYZ::OnTimer(UINT_PTR nIDEvent)
{
if (g_Scroll == 1) {
		if ( sc< 16 ){
			BuzzerOnce(1);
			SC++;
		}
		else
			sc = 1;
	}
 
	...
	SetTimer(1361, 2500, NULL);  //Have to set this, other wise OnTimer only runs once. I am confused with this statement.
	CDialog::OnTimer(nIDEvent);
}

DavidCrow

21 May '13 - 9:36

Set the timer once in the dialog's `OnInitDialog()` method. "One man's wage rise is another man's price increase." - Harold Wilson "Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons "Show me a community that obeys the Ten Commandments and I'll show you a less crowded prison system." - Anonymous
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21 May '13 - 15:32

Thanks, but, it's like in the OnPaint();
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thanh_bkhn

21 May '13 - 16:46

I don't understand why you have to set the timer again because it will repeatedly called. If you want to handle multiple timers, you can call SetTimer() with multiple Id, for example

SetTimer(12, 2500, NULL);
SetTimer(1361, 2500, NULL);

Then in the OnTimer(UINT nIDEvent), you can process it as below:

if(nIDEvent == 12){
...
}
if(nIDEvent == 1361){
...
}

21 May '13 - 21:04

That means the timer will be set every time a `WM_PAINT` message is received. A very bad idea, since you have no control over it. Use the best guess
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22 May '13 - 15:02

Tried to put SetTimer() in OnInitDialog(), just trigger OnTimer() once, so weird. But it is a old project wrote by others, I just tried to add a timer, to do something. I wonder timer is a resource, like c++ "new" something, right? it will take up memory, if settimer repeatedly, no killertimer, then that means it will use more and more memory, right?
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22 May '13 - 17:23

I have a new question about SetTimer(), if I use a unique ID, say, SetTimer(2, 1000, NULL), then, I repeat this statement many times, SetTimer(2, 1000, NULL),.... Then, I set one timer named 2 many times, or I set many timer with same name 2? that is, after 100 SetTimer(2,1000,NULL); there is only one Timer with name 2 in the system. or there are 100 pcs Timer with name 2 in the system?
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22 May '13 - 21:00

In this case you are just resetting Timer2 with every call, but why do that - again it serves no purpose. Maybe it would be better if you actually explained what problem you are trying to solve. Use the best guess
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