Qt : ‘Qchar’ has not been declared

threaderslash · 05-03-2009, 08:31 PM

Hi Guys,

I am trying to run the example from the Qt4 2nd Edition - Blanchette.

Have done the page 38 example. But it doen't work.

Here is the message:

sortdialog.h:14: error: expected class-name before ‘{’ token
sortdialog.h:19: error: ‘Qchar’ has not been declared

I have then included in the files

#include <QString>
#include <QChar>

But the compile error keeps the same. I have used the QtDesigner then make changes to link the slots and events.

Has someone any hints, please??

fantas · 05-03-2009, 09:00 PM

QChar != Qchar

threaderslash · 05-03-2009, 09:21 PM

Thanks! you're right.
Now just left one error:
sortdialog.h:14: error: expected class-name before ‘{’ token

here is part of the sortdialog.h:

//--------------------------------------//
class SortDialog : public QDialog, public Ui::SortDialog
{
Q_OBJECT;

public:
SortDialog(QWidget *parent=0);
void setColumnRange(QChar first, QChar last);
};
//--------------------------------------//

Maybe there some detail still missing. Some suggestion please?

John VV · 05-03-2009, 10:58 PM

change the line of code on line 19 of "sortdialog.h" ( all Qchar's to char)

Quote:

sortdialog.h:19: error: ‘Qchar’ has not been declared

from "qchar " to " char "

threaderslash · 05-04-2009, 01:18 AM

thanks a lot it worked now!

sharky · 05-05-2009, 05:17 PM

I'm getting a similar error with the exact same example from the book.

Quote:

In file included from main.cpp:2:
sortdialog.h:8: error: expected class-name before '{' token
make: *** [main.o] Error 1

Changing QChar to char did not alter the results at all.

Quote:

#ifndef SORTDIALOG_H
#define SORTDIALOG_H

#include <QDialog>
#include "ui_sortdialog.h"

class SortDialog : public QDialog, public Ui::SortDialog
{
Q_OBJECT

public:
SortDialog(QWidget *parent = 0);
void setColumnRange(QChar first, QChar last);
};

#endif

The error refers to line 8 instead of 16 in my case. I sub-noob when it comes to c++ so I don't even know where to begin with troubleshooting this.

John VV · 05-05-2009, 07:12 PM

it is my understanding that "qchar" is no more and the code will need to be edited to use just "char"

if the error is listed as in a *.h then where in the .cpp file is it calling that function . some function is using qchar

sharky · 05-06-2009, 12:29 PM

Quote:

Originally Posted by John VV

it is my understanding that "qchar" is no more and the code will need to be edited to use just "char"

if the error is listed as in a *.h then where in the .cpp file is it calling that function . some function is using qchar

I changed all "QChar" in the .cpp and .h file to "char" and got the exact same error.

Quote:

In file included from main.cpp:2:
sortdialog.h:8: error: expected class-name before '{' token
make: *** [main.o] Error 1

Should I interpret from this error that "SortDialog" is not a class-name?

Code:

#ifndef SORTDIALOG_H
#define SORTDIALOG_H

#include <QDialog>
#include "ui_sortdialog.h"

class SortDialog : public QDialog, public Ui::SortDialog
{
  Q_OBJECT

public:
    SortDialog(QWidget *parent = 0);
    void setColumnRange(char first, char last);
};

#endif