QT and Mini2440: convert Qstring to Char

Hello everyone,
I am using Qt Designer to create a GUI for Mini2440 and C++.
But I am not good at C++.  
So, in GUI, I have object "Line edit" to receive character for user.
So, this text is defined "Qstring". So, I wanna convert it to 'char' to
send by UART.
So, my code to get text from Line edit:
    QString text="";    
    text=box->text();//box is the name of the object "Line edit"
I cannot use:
    char temp[]="";
    temp=text.latin1();

My function: write(fd, temp, n_bytes); to send UART.
How can I convert "text" as Qstring above to "temp" as Char.
Thannks in advance.

This is question not related to this forum!!!Anyway you can use:
QString text = "abc";
char *txt = text.toAscii().data();

Marek

Firstly,Iam so sorry because of posting this topic in wrong possition.
 
Sencondly, Thanks you Open-nandra. But Qt cannot find ".toAscii" although I
included Qcstring.h & Qstring.h.
Some more about my project: 
My project uses QtDesigner to create a GUI for Kit Mini2440. It has a Line
edit box to receive texts from user and send them via UART. All project was
built without error and downloaded to the Mini2440 successfully.
But, when I press SEND button to send texts in this box "Line edit", I got
the message "[name of project] was terminated due to application error
(11)".
This is my code to change get text and send them:
I use library "terminos.h" for UART 
[code]
      QString text="";
      text=text_setspeed->text(); 
      //text_setspeed is the name of the Line edit
      write(fd,text.latin1(),text.length());
      // But if I code like this, it has no error:
      QString text="abc";
      write(fd,text.latin1(),text.length());
[/code]
Ps: I included my project

Sorry, I forgot include file.
It is here
Thank you in advance.

Well if it crashes you have something wrong in your code ;). 
You use qtopia not qt embedded for app development?

At least QString has toAscii method:
http://doc.qt.nokia.com/latest/qstring.html#toAscii

Marek

Iam using Qt Designer by Trolltech.
 If I use
"
      QString text="";
      text=text_setspeed->text();
"
I got error ""[name of project] was terminated due to application error
(11)"
Do you have another way to get text from Line edit?
Thank you so much.

Well I suppose there is no problem with get string from lineedit:
Normally QString lineEditText = lineEdit->text();

I think problem is with you sp_write function because you set string liegth
to some number which could lead to access memory which not belong to you.
Just use that:

QString lineEditText = lineEdit->text();
QByteArray send = lineEditText.toAscii();
int len = send.size();

sp.sp_write(send.data(), len);

Marek

Thank you very much, Open-nandra.
I included qcstring.h, Qstring.h and I used code above. But it couldnot
build.
The error is: Class Qstring has no member named "toAscii".
Sorry if my question was stupid. :D because I've just used Linux embedded
for 2 weeks.
Again, I sincerely appreciate your enthusiasm.
Wish you stay healthy and successful
Ps.I include the screen with the error.

OK download qtopia sources and find it out try this:

QString lineEditText = lineEdit->text();
int len = send.lineEditText();

sp.sp_write(lineEditText.data(), len);

Marek

Iam using Qtopia 2.2.0, But, qstring.h doesnot have function .toAscii or
.ascii , it just have .latin1().
Do I have to download the newer version Qtopia?
Thank you so much.

Do you read my last comment? There is no toAscii().

QString lineEditText = lineEdit->text();
int len = lineEditText.size();

sp.sp_write(lineEditText.data(), len);

When I use your code, I got an error: 
Class Qstring has no member named 'size' and some other errors.
I attach the image of the error.
Thank you so much, Open-nandra.

Hey man, did you ever code? ;)

I give you an pointer: 
you have lineEditText.data() which is char * so why don't you use C strlen
instead size() method. I don't find any Qtopia docu to check QString,
sorry.

hi coungle, may be the problem is in here:

void MotorForm::stopmotor()
{
  //add your code here
  //int i;
  //i=text1.length();
  //QString text="abc";
        char txt[]="abc";
  
        //QByteArray temp =text.toAscii();
  //char *txt=temp.data();
  
  //text=text_setspeed->text();
  //char *txt=text.toAscii().data();
  
  //char data[]="Stop Motor\n\r";
  sp.sp_write(txt,10);
}