[Qt-interest] enter key event to serial communication

[Arnold Krille]

On Monday 22 February 2010 07:39:22 Yuvraj wrote:
> Bradley T. Hughes wrote:
> > On 02/19/2010 02:56 PM, Yuvraj wrote:
> >> Hi all
> >>
> >> How do i send a enter key event to serial communication devices?
> >
> > No offense, I don't see how this relates to Qt? Perhaps your question
> > is best asked somewhere else (like a forum/mailing-list/news-group
> > that specializes in serial communications?)
> 
> No, my problem is sending enter key value(  QT  related). when i am
> pressing the push-button i am doing below mentioned task..
> 
> QString crlf;
>     crlf = 0x0d;  // enter key value
>     QString data1 = ui->send_text->text().append(crlf);
>     com.writeData(data1.toLatin1(),100);
>      ui->send_text->clear();
> 
> but in receiver side it is waiting for enter key value ,once it get
> enter key value , Then only it will do something

Is "com" a QFile accessing the serial device? Then call "com.flush()" to make 
sure the data is written...
But why are you doing "com.writeData( ..., 100 )" ? Surely your string isn't 
100 chars long? Better do:

QByteArray data1 = ui->send_text->text().toLatin1();
data1.append(crlf);
com.writeData(data1);
com.flush();
ui->send_text->clear();

And maybe your crlf has the wrong value. Sometimes you can't even trust the 
documentation, I have seen devices only working with lf or crlf when the docs 
stated that it needs cr as line-end.

Have fun,

Arnold
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