C / C++ / MFC

Re: Help! for access the parallel port

16-Feb-04 17:05

You need to write a device driver for that. There should be several free ones on the net that already do the work for you.

John

John M. Drescher16-Feb-04 17:09

Re: Help! for access the parallel port

16-Feb-04 17:09

Here are some links to get you started:

http://www.codeproject.com/csharp/csppleds.asp[^]

http://www.logix4u.net/[^]

John

Andrew Walker16-Feb-04 19:49

Andrew Walker

16-Feb-04 19:49

We had some success using winio from http://www.internals.com/[^] last time we were doing this at uni.

If you can keep you head when all about you
Are losing theirs and blaming it on you;
If you can dream - and not make dreams your master;
If you can think - and not make thoughts you aim;
Yours is the Earth and everything that's in it.

Rudyard Kipling

how to read the CD_ROM sectors

longdafeng16-Feb-04 15:15

longdafeng

16-Feb-04 15:15

hi:
I want to read the CD_ROM MODE2 sectros,but I don't know what's wrong with the code.The "Result" is TRUE and "error" is 0,but there is no data in the "lpSector".
who can help me.

thank you very much

hCD = CreateFile ("\\\\.\\M:", GENERIC_READ,
FILE_SHARE_READ|FILE_SHARE_WRITE,
NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL,
NULL);
RAW_READ_INFO raw_info;
ZeroMemory(&raw_info,sizeof(raw_info));

raw_info.DiskOffset.QuadPart =2000*2352 ;
raw_info.SectorCount = 10;
raw_info.TrackMode = YellowMode2;

Result=DeviceIoControl(hCD, IOCTL_CDROM_RAW_READ,
&raw_info, sizeof(RAW_READ_INFO),
lpSector, dwSize,
&dwNotUsed, NULL);
DWORD error=GetLastError();
WriteFile (hFile, lpSector, dwSize, &dwNotUsed, NULL);

John M. Drescher16-Feb-04 15:46

16-Feb-04 15:46

How about ReadFile() instead of WriteFile()?

John

Re: how to read the CD_ROM sectors - EDITED

longdafeng16-Feb-04 16:04

longdafeng

16-Feb-04 16:04

Using ReadFile can't read CD_ROM MODE2 FORM2,

First all ,thank you very much

John M. Drescher16-Feb-04 16:07

16-Feb-04 16:07

I am a little confused. You can not expect to read anything with a WriteFile()?

[EDIT]
Oh... I see you are trying to do the read with DeviceIoControl.. I got confused by the WriteFile part..
[/EDIT]

John

John M. Drescher16-Feb-04 16:28

16-Feb-04 16:28

Sorry for the confusion. I am not sure of the answer. And it looks like it will be a difficult question to find an answer as there are not too many hits when I search the net for IOCTL_CDROM_RAW_READ.

John

Re: Constraining CWnd size

longdafeng16-Feb-04 16:47

longdafeng

16-Feb-04 16:47

I want to do another thing with WriteFile,
I have used ReadFile,but it can read MODE1 and MODE2 FORM1,can't read MODE2 FORM2.
So I want to read MODE2 with DeviceIOContrl and IOCTL_CDROM_RAW_READ
but there is no data in the buffer

Constraining CWnd size

garycage16-Feb-04 14:52

garycage

16-Feb-04 14:52

I am trying to constrain the resizing of a MDIChildWnd to maintain a given aspect ratio. I am having no luck. The best I have been able to do is in the CWnd::OnSize function to look at the new size, calculate what a properly proportioned frame should be and call CWnd::SetWindowPos. I almost get what I need, it is just there is no frame around the client area. Annyone have any ideas?

John M. Drescher16-Feb-04 16:01

problems with static members

16-Feb-04 16:01

Take a look at CWnd::OnSizing and CWnd::CalcWindowRect

John

Ylis16-Feb-04 12:32

Ylis

16-Feb-04 12:32

I'm having some trouble with static members in my program. This is what my code looks like:

<br />
#ifndef TIMER_H<br />
#define TIMER_H<br />
class Timer<br />
{<br />
private:<br />
	static LARGE_INTEGER m_lTicksPerSecond;<br />
	static LARGE_INTEGER m_lTime;<br />
	static LARGE_INTEGER m_lFirstTime;<br />
	Timer();<br />
public:<br />
	static bool Initialize()<br />
	{<br />
		if(QueryPerformanceFrequency(&m_lTicksPerSecond) && QueryPerformanceCounter(&m_lFirstTime))<br />
			return true;<br />
		return false;<br />
	}<br />
	static double MsSinceStart()<br />
	{<br />
		QueryPerformanceCounter(&m_lTime);<br />
		return ((double)(m_lTime.QuadPart - m_lFirstTime.QuadPart ) / (double)m_lTicksPerSecond.QuadPart ) * 1000.0;<br />
	}<br />
};<br />
#endif<br />

Or you can check it out at http://www.rafb.net/paste/results/SD400728.html (don't know if codeproject supports the formating).
Anyway, the error I'm geting is:
error LNK2001: unresolved external symbol "private: static union _LARGE_INTEGER Timer::m_lFirstTime" (?m_lFirstTime@Timer@@0T_LARGE_INTEGER@@A) on every member. The program it self is a win32 application.

Grateful for any help Wink | ;)

Robert A. T. Káldy16-Feb-04 13:08

Robert A. T. Káldy

16-Feb-04 13:08

You should define all static members in the timer.cpp file, e.g.
LARGE_INTEGER Timer::m_lTime;.

Robert-Antonio

Ylis16-Feb-04 13:27

Ylis

16-Feb-04 13:27

I'm sorry but I can't get it to work :/

When I place LARGE_INTEGER Timer::m_lTime etc inside my .cpp file it begins to talk about redefinition errors.
If I remove LARGE_INTEGER m_lTime etc from my .h file it says 'm_lTime' : is not a member of 'Timer'.

could you write just a simple class with a static member explaining it to me?

Smile | :)

John M. Drescher16-Feb-04 13:17

16-Feb-04 13:17

Did you define m_lTicksPerSecond, m_lTime,m_lFirstTime and in your cpp file.

// In Timer.cpp
LARGE_INTEGER Timer::m_lTicksPerSecond=0;
LARGE_INTEGER Timer::m_lTime=0;
LARGE_INTEGER Timer::m_lFirstTime=0;

Also have you checked out this:

http://www.naughter.com/cputicker.html[^]

Removing the mfc part only takes a few seconds...

John

Ylis16-Feb-04 13:53

Ylis

16-Feb-04 13:53

oki, I checked out the cputicker class but still can't figure out what I'm doing wrong, perhaps I'm geting blind to my code.
This is what my 2 files looks like now:

Timer.h

<br />
#ifndef TIMER_H<br />
#define TIMER_H<br />
class Timer<br />
{<br />
protected:<br />
	static LARGE_INTEGER m_lTicksPerSecond;<br />
	static LARGE_INTEGER m_lTime;<br />
	static LARGE_INTEGER m_lFirstTime;<br />
	Timer();<br />
public:<br />
	static bool Initialize();<br />
	static double MsSinceStart();<br />
};<br />
#endif<br />

and this is what Timer.cpp looks like:

<br />
#include "Timer.h"<br />
<br />
LARGE_INTEGER Timer::m_lTicksPerSecond = NULL;<br />
LARGE_INTEGER Timer::m_lFirstTime = NULL;<br />
LARGE_INTEGER Timer::m_lTime = NULL;<br />
<br />
bool Timer::Initialize()<br />
{<br />
	if(QueryPerformanceFrequency(&m_lTicksPerSecond) && QueryPerformanceCounter(&m_lFirstTime))<br />
		return true;<br />
	return false;<br />
}<br />
double Timer::MsSinceStart()<br />
{<br />
	QueryPerformanceCounter(&m_lTime);<br />
	return ((double)( m_lTime.QuadPart - m_lFirstTime.QuadPart ) / (double) m_lTicksPerSecond.QuadPart ) * 1000.0;<br />
}<br />

and this is the error which seems relevant: error C2039: 'm_lFirstTime' : is not a member of 'Timer' (which it as you see is)

hehe, plz bare with me Poke tongue | ;-P

John M. Drescher16-Feb-04 16:26

16-Feb-04 16:26

I am not sure what the problem is. Check to make sure that your cpp file is indeed included in your project and it is compiling...

As for the link, since I saw you were trying to do some work with high resolution timers I thought the code there may save you some work...

John