serial port programming in qt

[high_flyer]

I have not used any thing like this function .

Sorry, I meant main().

yeah, it runs if i comment that line and place a printf there.And i'm sure i dont use that anywhere in my code.

Hmm... then from what you have said so far, it all points to a problem in your QextSerialPort lib.

Also i'm using qextserialport-0.8.0 package since only this supports qt-3.3.5 version. remaining packages such as qextserialport-0.9.0,1.0,1.1 supports higher versions of qt. will there be any problem with this version changes ?

What do you mean?
using a Qt4 QextSerialPort with Qt3?
That wont work.

[sar_van81]

The following in my main():

int main( int argc, char **argv )
{
    QApplication a( argc, argv );
    ConnectWidget connect1;    
    a.setMainWidget( &connect1 );
    connect1.show();
    return a.exec();
}

int main( int argc, char **argv )
{
    QApplication a( argc, argv );
    ConnectWidget connect1;    
    a.setMainWidget( &connect1 );
    connect1.show();
    return a.exec();
}

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What do you mean?
using a Qt4 QextSerialPort with Qt3?
That wont work.

No i mean i'm using qt-3.3.5 version and the other versions of qextserialport requires header and libraries of qt 4 or greater version.

[high_flyer]

Well, from what I can see, there is no problem with the code it self.

You can only link QextSerialPort for Qt3 (which is linked against Qt3) with Qt3 applications.
You can only link QextSerialPort for Qt4 (which is linked against Qt4) with Qt4 applications.

[sar_van81]

yeah as you said the code is right. and qextserialport package is used is also correct i think. i mean(for qt-3.3.5 package i used qextserialport-0.8.0 package).

I think they may have updated these features in the latest versions.And i'm linking qt3 application with qt3 package only.

[high_flyer]

And i'm linking qt3 application with qt3 package only.

That is the way it should be.

Strange.

[sar_van81]

hi,

i did by using linux syscalls.I used these codes in my qt application. but the i could not get the output i desired. Thats what i went for this package. but this also did not work. Looking for some other way..

[high_flyer]

Are you working with Qt or QTopia?

[sar_van81]

I'm working with qt-embedded -3.3.5 version.

[high_flyer]

I'm working with qt-embedded -3.3.5 version.

It could be the reason this is not working, since it could be that the low level port handling is diefferent on your embeded system.

[high_flyer]

In the docs of QexstSerialPort 0.70:

Posix_QextSerialPort::Posix_QextSerialPort ( )


Default constructor. Note that the name of the device used by a QextSerialPort constructed with this constructor will be determined by defined constants, or lack thereof - the default behavior is the same as _TTY_LINUX_. Possible naming conventions and their associated constants are:

Constant Used By Naming Convention
---------- ------------- ------------------------
_TTY_WIN_ Windows COM1, COM2
_TTY_IRIX_ SGI/IRIX /dev/ttyf1, /dev/ttyf2
_TTY_HPUX_ HP-UX /dev/tty1p0, /dev/tty2p0
_TTY_SUN_ SunOS/Solaris /dev/ttya, /dev/ttyb
_TTY_DIGITAL_ Digital UNIX /dev/tty01, /dev/tty02
_TTY_LINUX_ Linux /dev/ttyS0, /dev/ttyS1
<none> Linux /dev/ttyS0, /dev/ttyS1

This constructor assigns the device name to the name of the first port on the specified system. See the other constructors if you need to open a different port.

You might try one of these defines, in case your system is compatible with one of them.

And next time post QTopia questions under the QTopia forum.

[jagdeep]

hello dear all,
will anybody pls post any working qt3 example of qextserial.


thanks in advance

[high_flyer]

see post 21 in this thread.
It is an example for Qt4, but the differences are minimal, or none.
With reading the docs this example is more then enough to get started.