C / C++ / MFC

Re: QueryThreadCycleTime, QueryProcessCycleTime: what do these number mean?

24-Jan-23 2:02

Your code on my machine:

well, not perfect, but... Let's try another time:

Absolute rubbish laddie!

"In testa che avete, Signor di Ceprano?"
-- Rigoletto

Richard MacCutchan24-Jan-23 2:20

Re: QueryThreadCycleTime, QueryProcessCycleTime: what do these number mean?

24-Jan-23 2:20

CPallini wrote:
Absolute rubbish laddie!

I always suspected you were Scottish and not Italian. Laugh | :laugh:

CPallini24-Jan-23 2:32

Re: QueryThreadCycleTime, QueryProcessCycleTime: what do these number mean?

24-Jan-23 2:32

I am... Pink[^]!

"In testa che avete, Signor di Ceprano?"
-- Rigoletto

Randor 24-Jan-23 3:49

Randor

24-Jan-23 3:49

peterchen wrote:
This blog post[^] suggests that it should be no worse than QueryPerformanceCounter, but that's not what I'm seeing.
Anyone with insights?

My translation of what you are asking:

peterchen should have asked:
QueryProcessCycleTime uses the RDTSC instruction. QueryPerformanceCounter historically also used the RDTSC instruction. Why aren't they giving similar outputs?

As you probably already know the ~~TSC is superceeded~~ by the HPET. There are a dozen reasons why RDTSC provides inaccurate results. The Meltdown/Spectre mitigations were probably the nail in the coffin so to speak.

~~The answer to your question is that QueryPerformanceCounter uses the HPET/APIC clock and QueryProcessCycleTime is still using the old rdtsc instruction.~~

It's apparently a huge mess, @HaroldAptroot says sometimes QueryPerformanceCounter uses HPET and sometimes it doesn't depending on whether or not the TSC is invariant.

modified 24-Jan-23 15:14pm.

Re: QueryThreadCycleTime, QueryProcessCycleTime: what do these number mean?

harold aptroot24-Jan-23 8:42

harold aptroot

24-Jan-23 8:42

Randor wrote:
As you probably already know the TSC is superceeded by the HPET.

Not actually true though, QPC is based on HPET only when necessary, which is basically if you have a CPU that does not have Invariant TSC (and you don't, unless your CPU is from the mid 2000's). QPC is based on the TSC on every reasonable computer.

Re: QueryThreadCycleTime, QueryProcessCycleTime: what do these number mean?

Randor 24-Jan-23 9:06

Randor

24-Jan-23 9:06

Hmmm,

Do you know where I can find a list of processors with an invariant TSC? I see that cpuid has 80000007H to indicate support but where can I find a list of processors that support it?

Re: QueryThreadCycleTime, QueryProcessCycleTime: what do these number mean?

harold aptroot24-Jan-23 9:26

harold aptroot

24-Jan-23 9:26

Unfortunately I don't know of such a list and I couldn't find one either. There are lists of CPUID dumps.. not very convenient

"C++ is static (language)..."

Member 1496877121-Jan-23 9:57

Member 14968771

21-Jan-23 9:57

THIS IS NOT A "HOW DO I CODE ..." QUESTION - so if you have an issue with it - DO NOT READ IT....

I have just upset another forum trying to find out why

"

int QProcess::execute(const QString &program, const QStringList &arguments = {})

Starts the program program with the arguments arguments in a new process, waits for it to finish, and then returns the exit code of the process. Any data the new process writes to the console is forwarded to the calling process.

...will NOT

writes to the console is forwarded to the calling process

when used as STATIC.

The above documentation is written specifically for "static" function.

I am NOT going to argue about the doc, I just wanted to know what is so special when "static" (function) is used in C++.

If I have a C+_+ class and the function is defined as "static" - what is so different from function which is NOT defined as NOT static ?

Any reply TO THE SUBJECT will be appreciated , even RTFM
Cheers

Dynamic C++, Part 1[^]

Re: "C++ is static (language)..."

Mircea Neacsu21-Jan-23 10:59

Mircea Neacsu

21-Jan-23 10:59

The fact that C/C++ is a staticly-typed language has nothing to do with static member functions. In turn these have very little to do with static functions in general. They are just 3 different uses for the same word.

Member 14968771 wrote:
If I have a C+_+ class and the function is defined as "static" - what is so different from function which is NOT defined as NOT static ?

Regular member functions have one extra hidden parameter, the "this" pointer, that points to the object on which they are called. Static member functions don't have this hidden parameter and are very much like any regular function except for some scoping rules.

"Static", like "object" and "module" are a very abused words in programming.

Mircea

Re: "C++ is static (language)..."

Richard MacCutchan21-Jan-23 22:06

Re: "C++ is static (language)..."

21-Jan-23 22:06

Member 14968771 wrote:
If I have a C+_+ class and the function is defined as "static" - what is so different from function which is NOT defined as NOT static ?

A non-static member function is always called via an object reference. That is any call of the form:

C++

obj.SomeMethod(); // where obj is an instance of some class

has access to all the properties of that particular instance.
But for a static method called thus:

C++

ClassName::StaticMethod();

has no such access, and can only access static members of the class.

But I am not sure that that was your question.

Maybe some C++ learning is in order.

ps, please do not SHOUT in your messages, it is unnecessary and rude.

jschell22-Jan-23 8:17

jschell

22-Jan-23 8:17

Member 14968771 wrote:
will not. when used as STATIC.

Presumably you mean...

First you tried something without 'static' in place and it worked.

Second you put 'static' somewhere and now it doesn't work. The console output does not show up.

Not really a lot of information there. So the following are some possibilities for that behavior.
- You recompiled, it failed, and then when you ran something it did not find the binary. So it didn't actually run.
- You recompiled, it worked (because someone has some 'clever' code) and it failed with an exception. But you did not see that exception output or ignored it.
- You recompiled, it worked (because someone has some 'clever' code) and that other code worked. But you did not see any output because the actual method that was called, which is a different one, does not do console output.

Can you make a serial port hooking program?

Member 1590067020-Jan-23 21:07

Member 15900670

20-Jan-23 21:07

Hi...
We need some program.
We are using a POS equipment. some program must be printed by POS.
before printing we need a hooking a text message from com port.

When the program start. we must find a com port which com port is conneced with POS equipment.
Whenever the com port is used for printing. the text message must be returened to some way.
- the way can be suggested to you. This text message will be used by another program.

Richard MacCutchan20-Jan-23 22:10

20-Jan-23 22:10

Take a look at Serial port programming using Win32 API (Windows) - Aticleworld[^] and Serial port I/O[^] for suggestions.

CPallini21-Jan-23 3:00

21-Jan-23 3:00

See Null-modem emulator (com0com) - virtual serial port driver for Windows[^].

"In testa che avete, Signor di Ceprano?"
-- Rigoletto

jschell22-Jan-23 8:23

jschell

22-Jan-23 8:23

You are describing a case where you have an existing application flow: Serial port to POS.

And you want to put monitoring place to see what that serial traffic looks like. So you don't want to replace or modify the existing code but rather just see what is happening.

So you should google for the following

windows serial port intercept

That said however I would suggest that if the POS code is under your control that the POS code itself should be modified to provide the same sort of monitoring. Log files (search for libraries) can both be used to control and collect such data.

charlieg28-Jan-23 8:58

charlieg

28-Jan-23 8:58

Meanwhile "member" - describe your background. Still in school?

Charlie Gilley

“They who can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety.” BF, 1759

Has never been more appropriate.

foreach() ??

Member 1496877118-Jan-23 7:36

Member 14968771

18-Jan-23 7:36

I like to learn how to use "foreach".
I have posted similar request on another forum and got "RTFM"

Could somebody REWRiTE the attached using "foreach" ?

..and a simple explanation of code used ( called "comments" ) would be nice.

I need to start with "foreach" before goto "new style" of "for".

Thanks

<pre>   localAdapters = QBluetoothLocalDevice::allDevices();
    count = localAdapters.count();
    ui->chat_10->clear();

    qDebug()<< " localAdapters  count " << QString::number(count);
    for(int index = 0; index < count; index++)
    {
        qDebug()<< " local adapter address" << localAdapters.at(index).address().toString();
        ui->chat_10->append( localAdapters.at(index).address().toString());
        qDebug() << " local adapater name " << localAdapters.at(index).name();
        ui->chat_10->append( localAdapters.at(index).name());
    }

Mircea Neacsu18-Jan-23 7:41

Mircea Neacsu

18-Jan-23 7:41

This should work:

C++

for(auto& adapter : localAdapters)
    {
        qDebug()<< " local adapter address" << adapter.address().toString();
        ui->chat_10->append( adapter.address().toString());
        qDebug() << " local adapater name " << adapter.name();
        ui->chat_10->append( adapter.name());
    }

Mircea

CPallini18-Jan-23 7:51

18-Jan-23 7:51

Try (not tested)

C++

auto localAdapters = QBluetoothLocalDevice::allDevices();
ui->chat_10->clear();
qDebug()<< " localAdapters  count " << QString::number(localAdapters.count());
for (const auto & device : localAdapters)
{
  qDebug()<< " local adapter address" << device.address().toString();
  ui->chat_10->append( device.address().toString());
  qDebug() << " local adapater name " << device.name();
  ui->chat_10->append( device.name());
}

"In testa che avete, Signor di Ceprano?"
-- Rigoletto

Member 1496877121-Jan-23 10:04

Member 14968771

21-Jan-23 10:04

Somebody send me a private message to which I am unable to reply...
I want to make sure he /she knows I got it and appreciate it.
I did rewrite few lines of code using both "foreach" and "for" ,
works much gooder then the old "indexing" stuff...
Thanks

jschell22-Jan-23 8:26

jschell

22-Jan-23 8:26

Better is subjective.

For example if you modify the existing code to the following line then you should continue to use the existing solution

qDebug()<< "index=" << i << " local adapter address" << localAdapters.at(index).address().toString();

CRichedit and CDC

ForNow18-Jan-23 2:51

ForNow

18-Jan-23 2:51

Hi

I have been able to format all my text. via Streamin, Next thing I would like to draw is bitmap breakpoint I mean like in the visual studio debugger. I think the examples of using the richeditole interface is if you streamin SF_RTF mine was done as text SF_TEXT.

I thinking of getting the richedit DC via CWnd::GetDC and maybe draw an ellipse

I think if i draw it on the richedit itself it might misalign the rest of the text a line, then there is the option of drawing it on the side of the dialog box though when I page up and down the text I would have to erase and re-draw if anyone has any ideas how to go about this, I would appreciate it. But as I said most of the examples, I saw for drawing in richedit was streaming with SF_RTF THANKS

Re: CRichedit and CDC

ForNow20-Jan-23 2:24

ForNow

20-Jan-23 2:24

As I have stated in my question the OLE interfaace only works SF_RTF my text was streamed in SF_TEXT

I have decided to copy Visual Studio the code is probably in SF_TEXT if you look around the code there is a frame possibly a dialogbox frame the breakpoint is probably and CDC::Ellipse. bitmaps seem to have a 3d look With SF_TEXT you cann't draw in the rich edit it messes up the text. I drew on side of the adjoining dialogbox box frame what I really needed was the y coordinates got the from PosFromChar the x I can determine from the width of the dialogbox frame thank you

Re: CRichedit and CDC

Richard MacCutchan20-Jan-23 2:37