Re: VC++ Graphs. - C / C++ / MFC Discussion Boards

Re: How to use CMimeMessage to send a mail with attached file?

André Kraak25-Sep-11 4:38

André Kraak

25-Sep-11 4:38

This Mailer Sample[^] demonstrates the use of CMimeMessage::AttachFile[^].

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Watch cannot find symbol $x

AlecJames24-Sep-11 4:35

AlecJames

24-Sep-11 4:35

This is a C console application in VS2008.

I've got a script language similar to C but the host application has very few debug facilites. With a little modification I can convert the script to plain C and run it in a wrapper in a console app. In the script all variables must start $. If I try to watch a variable $x the watch window says:

$x	CXX0017: Error: symbol "x" not found

If I #define $x x it finds it OK but I have to redefine all my variables this way in order to watch them.

Does anyone know why VS doesn't like the leading $ and whether it's possible to configure it to accept it as a normal symbol?

Thanks
A

Re: Watch cannot find symbol $x

Richard MacCutchan24-Sep-11 5:56

Richard MacCutchan

24-Sep-11 5:56

This looks like a mistake on Microsoft's part. Even though they allow a variable to start with a dollar sign, the debugger does not seem to recognise it.

Unrequited desire is character building. OriginalGriff

Re: Watch cannot find symbol $x

Albert Holguin24-Sep-11 6:34

Albert Holguin

24-Sep-11 6:34

If that is an error... interesting catch... Thumbs Up | :thumbsup:

It wouldn't be the first time one part of the MS IDE doesn't match what another part does.

Re: Watch cannot find symbol $x

Richard MacCutchan24-Sep-11 6:43

Richard MacCutchan

24-Sep-11 6:43

Having never used the dollar sign (a Microsoft extension) for identifier names I thought it worth a try.

Unrequited desire is character building. OriginalGriff

VC++ Graphs.

Vijay Rajanna23-Sep-11 7:08

Vijay Rajanna

23-Sep-11 7:08

Hi,
In my VC++ project I have to draw 2D graphs (X,Y). I would like to know which component I have to use for the same.

Also, The graphs should be rendered at run time continuously for the input values, same like display of ECG machine.

I'm using VS 2010 Express edition..

Hope you have understood my issue, kindly reply,

Regards,
Vijay.

Re: VC++ Graphs.

Rajesh R Subramanian23-Sep-11 7:20

Rajesh R Subramanian

23-Sep-11 7:20

Cedric had an article on that. I'm not sure if that would suit your needs, but take a look at it: High-speed Charting Control[^]

"Real men drive manual transmission" - Rajesh.

Re: VC++ Graphs.

Albert Holguin23-Sep-11 8:36

Albert Holguin

23-Sep-11 8:36

Using the Windows GDI is relatively simple once you get used to it. It should be relatively easy to draw 2D graphs with it even at high rates (for high rates, read up on bitblt).

Re: VC++ Graphs.

Vijay Rajanna23-Sep-11 9:01

Vijay Rajanna

23-Sep-11 9:01

Hi,
Thanks all, after exploring I could see that I can directly use "Chart" control provided by VS.

~Vijay.

Re: VC++ Graphs.

Software_Developer23-Sep-11 9:37

Software_Developer

23-Sep-11 9:37

ECG recording, storing, filtering and recognition
ECG recording, storing, filtering and recognition[^]

Re: VC++ Graphs.

Cedric Moonen25-Sep-11 20:31

Cedric Moonen

25-Sep-11 20:31

Hi,

Rajesh already pointed out to my chart control article, but just to let you know that I think it will fit perfectly with your case: it was originaly developed for medical applications (one of the use was for ECG).

Cédric Moonen
Software developer

Charting control [v3.0]
OpenGL game tutorial in C++

Can I use a SetTimer() API in a console c++ app.

JosephJohnAllen23-Sep-11 5:57

JosephJohnAllen

23-Sep-11 5:57

I have a console application that is using a DLL that uses a SetTimer() call to create a timer and fire a function within itself. The call is below...

SetTimer((HWND)NULL, 0, timer_num, (TIMERPROC)UnSyncMsgTimer)) == 0)

It is expecting to receive timer messages but this never happens, I assume because mine is a console application and not a standard Windows GUI application (like where the DLL was originally used). This stops a key part of the DLLs functionality from working.

My application needs to stay a console application and I cannot change the DLL.

Does anybody know of a work around to make this work?

Thanks, Joseph

Re: Console SetTimer

Software_Developer23-Sep-11 6:14

Software_Developer

23-Sep-11 6:14

The following console program works. It sets a timer using SetTimer
then loops in a message loop. The message loop receives and processes WM_TIMER messages
and the timer callback also is called for each time interval.

C++

#define STRICT 1 
#include <windows.h>
#include <iostream.h>

VOID CALLBACK TimerProc(HWND hWnd, UINT nMsg, UINT nIDEvent, DWORD dwTime) 
{
  cout << "Time: " << dwTime << '\n';
  cout.flush();
}

int main(int argc, char *argv[], char *envp[]) 
{
	int Counter=0;
	MSG Msg;

    UINT TimerId = SetTimer(NULL, 0, 500, &TimerProc); //SetTimer

    cout << "TimerId: " << TimerId << '\n';
   if (!TimerId)
	return 16;
    
   while (GetMessage(&Msg, NULL, 0, 0)) 
   {
    	++Counter;
    	if (Msg.message == WM_TIMER)
		cout << "Counter: " << Counter << "; timer message\n";
    	else
		cout << "Counter: " << Counter << "; message: " << Msg.message << '\n';
    	DispatchMessage(&Msg);
	}
    
   KillTimer(NULL, TimerId);
return 0;
}

Re: Console SetTimer

Albert Holguin23-Sep-11 8:39

Albert Holguin

23-Sep-11 8:39

I think he means the SetTimer() call is within the DLL and he can't change that... doesn't he... D'Oh! | :doh:

...so he just needs to be able to catch the message and make sure the timer ID matches whatever he set...

Re: Console SetTimer

Software_Developer23-Sep-11 21:43

Software_Developer

23-Sep-11 21:43

Ah ,ok .

Re: Can I use a SetTimer() API in a console c++ app.

André Kraak23-Sep-11 8:46

André Kraak

23-Sep-11 8:46

Is the timer function UnSyncMsgTimer exposed by the dll?
If it is you might start your own timer and call it.

0100000101101110011001000111001011101001

Re: Can I use a SetTimer() API in a console c++ app.

Randor 23-Sep-11 15:19

Randor

23-Sep-11 15:19

C++

SetTimer((HWND)NULL, 0, timer_num, (TIMERPROC)UnSyncMsgTimer)) == 0)

How do you know the line of code inside the DLL that sets the timer? Do you have the DLL source code?

Best Wishes,
-David Delaune

Re: Can I use a SetTimer() API in a console c++ app.

Jörgen Sigvardsson24-Sep-11 6:39

Jörgen Sigvardsson

24-Sep-11 6:39

That will not work without a message loop.

--
Kein Mitleid Für Die Mehrheit

Re: Can I use a SetTimer() API in a console c++ app.

Randor 24-Sep-11 12:41

Randor

24-Sep-11 12:41

Hi,

What won't work? I am properly formatting and quoting the code posted by the original poster and asking if he has the source code to the DLL in question.

Best Wishes,
-David Delaune

Re: Can I use a SetTimer() API in a console c++ app.

Jörgen Sigvardsson24-Sep-11 13:00

Jörgen Sigvardsson

24-Sep-11 13:00

Woops, sorry. I guess the DLL won't work unless he implements a message pump.

--
Kein Mitleid Für Die Mehrheit

PostThreadMessage does not work sometimes

rahul.kulshreshtha23-Sep-11 1:26

rahul.kulshreshtha

23-Sep-11 1:26

Hi,

I am using PostThreadMessage & PostMessage to post messages on Thread and Windows respectively. It works fine in most of cases but when there is a high frequency of posting messages then sometimes it misses some messages. I mean message posts successfully but MessageHandler is not called. If I sent 1000 messages then message handler gets call only 990 or 980 times. Can anyone suggest something for this problem? I am too tired now Sleepy | :zzz:

Thanks,
Rahul Kulshreshtha

Re: PostThreadMessage does not work sometimes

Rajesh R Subramanian23-Sep-11 4:05

Rajesh R Subramanian

23-Sep-11 4:05

Are you sure that PostThreadMessage() succeeded? If the return value was false, and GetLastError() returned ERROR_NOT_ENOUGH_QUOTA, then your message posting failed because the recipient message queue was full. In this case, you may want to try and post the message after a short delay. The doc is here: http://msdn.microsoft.com/en-us/library/windows/desktop/ms644946(v=vs.85).aspx[^]

The more pressing question is: Why are you posting such large number of messages in a short time, anyways?

"Real men drive manual transmission" - Rajesh.

modified 24-Sep-11 1:16am.

Re: PostThreadMessage does not work sometimes

Albert Holguin23-Sep-11 5:15

Albert Holguin

23-Sep-11 5:15