Qt-interest Archive, March 2007
Q_DECLARE_METATYPE error compiling
Message 1 in thread
I have header
#ifndef TFORM_H
#define TFORM_H
#include <QMainWindow>
#include <QtSql>
#include <QDomDocument>
#include <QMetaType>
#include "ui_form.h"
class TForm : public QMainWindow, public Ui::MainWindow
{
Q_OBJECT
public:
TForm();
bool ReadConfig(const QString&);
bool WriteConfig(const QString&);
void ScreenCenter();
protected:
public slots:
void on_btnExec_clicked();
void on_btnConnect_clicked();
void on_cbStyles_currentIndexChanged( const QString & text );
protected:
void closeEvent(QCloseEvent *event);
private:
QSqlDatabase db;
typedef struct MyType
{
int id;
QString str;
};
Q_DECLARE_METATYPE(MyType)
};
#endif
why compiler show error ?
TForm.h:34: error: invalid explicit specialization before '>' token
TForm.h:34: error: explicit specialization in non-namespace scope `class
TForm'
TForm.h:34: error: struct QMetaTypeId<TForm::MyType> redeclared with
different a
ccess
TForm.h: In static member function `static int
QMetaTypeId<TForm::MyType>::qt_me
tatype_id()':
TForm.h:34: error: `MyType' undeclared (first use this function)
TForm.h:34: error: (Each undeclared identifier is reported only once for
each fu
nction it appears in.)
TForm.h:34: error: template argument 1 is invalid
TForm.h:34: error: template argument 1 is invalid
TForm.h:34: error: no matching function for call to
`qRegisterMetaType(const cha
r[7])'
--
[ signature omitted ]
Message 2 in thread
Ok, i found solution:
struct MyType;
Q_DECLARE_METATYPE(MyType)
struct MyType
{
int id;
QString str;
};
class TForm : public QMainWindow, public Ui::MainWindow
{
Q_OBJECT
public:
TForm();
bool ReadConfig(const QString&);
bool WriteConfig(const QString&);
void ScreenCenter();
protected:
public slots:
void on_btnExec_clicked();
void on_btnConnect_clicked();
void on_cbStyles_currentIndexChanged( const QString & text );
protected:
void closeEvent(QCloseEvent *event);
private:
QSqlDatabase db;
};
#endif
--
[ signature omitted ]
Message 3 in thread
To draw a rubber-band rectangle/line with a CONSTANT color is not a good
idea,
because it may turn to be invisible due to the same background or the
same objects color with the pen.
What we need is a pen which inverses the screen pixel color, for example,
pen turns white in black background, and turns black in white background.
I know definitely MFC has such a drawing mode, I wonder if Qt has?
Lingfa
--
[ signature omitted ]
Message 4 in thread
painter.setRasterOp(XorROP);
> -----Original Message-----
> From: qt-interest-request@xxxxxxxxxxxxx
> [mailto:qt-interest-request@xxxxxxxxxxxxx]On Behalf Of Lingfa Yang
> Sent: 23 March 2007 16:38
> To: qt-interest@xxxxxxxxxxxxx
> Subject: Does Qt has a pen to draw XOR screen pixel?
>
>
> To draw a rubber-band rectangle/line with a CONSTANT color is not a good
> idea,
> because it may turn to be invisible due to the same background or the
> same objects color with the pen.
> What we need is a pen which inverses the screen pixel color, for example,
> pen turns white in black background, and turns black in white background.
> I know definitely MFC has such a drawing mode, I wonder if Qt has?
>
> Lingfa
>
>
> --
> To unsubscribe - send a mail to qt-interest-request@xxxxxxxxxxxxx
> with "unsubscribe" in the subject or the body.
> List archive and information: http://lists.trolltech.com/qt-interest/
>
>
--
[ signature omitted ]
Message 5 in thread
Gert van Loo wrote:
> painter.setRasterOp(XorROP);
>
>
error C2039: 'setRasterOp' : is not a member of 'QPainter'
--
[ signature omitted ]
Message 6 in thread
On 23.03.07 14:30:16, Lingfa Yang wrote:
> Gert van Loo wrote:
>
> > painter.setRasterOp(XorROP);
> >
> error C2039: 'setRasterOp' : is not a member of 'QPainter'
I guess thats Qt3. For Qt4 you're looking for the composition mode
(found via scanning the QPainter method list for maybe 30 seconds)
Andreas
--
[ signature omitted ]
Message 7 in thread
Andreas Pakulat a écrit :
> On 23.03.07 14:30:16, Lingfa Yang wrote:
>
>> Gert van Loo wrote:
>>
>>
>>> painter.setRasterOp(XorROP);
>>>
>>>
>> error C2039: 'setRasterOp' : is not a member of 'QPainter'
>>
>
> I guess thats Qt3. For Qt4 you're looking for the composition mode
> (found via scanning the QPainter method list for maybe 30 seconds)
>
> Andreas
>
>
There are no bitwise XOR paint operations in Qt4 AFAIK, only alpha XOR.
--
[ signature omitted ]
Message 8 in thread
Hi,
Luper Rouch wrote:
> Andreas Pakulat a écrit :
>> On 23.03.07 14:30:16, Lingfa Yang wrote:
>>
>>> Gert van Loo wrote:
>>>
>>>
>>>> painter.setRasterOp(XorROP);
>>>>
>>>>
>>> error C2039: 'setRasterOp' : is not a member of 'QPainter'
>>>
>>
>> I guess thats Qt3. For Qt4 you're looking for the composition mode
>> (found via scanning the QPainter method list for maybe 30 seconds)
>>
>> Andreas
>>
>>
> There are no bitwise XOR paint operations in Qt4 AFAIK, only alpha XOR.
QRubberBand is designed for this purpose in Qt4.
Tim
--
[ signature omitted ]
Message 9 in thread
Tim Dewhirst wrote:
> Hi,
>
> Luper Rouch wrote:
>
>> Andreas Pakulat a écrit :
>>
>>> On 23.03.07 14:30:16, Lingfa Yang wrote:
>>>
>>>
>>>> Gert van Loo wrote:
>>>>
>>>>
>>>>
>>>>> painter.setRasterOp(XorROP);
>>>>>
>>>>>
>>>>
>>>> error C2039: 'setRasterOp' : is not a member of 'QPainter'
>>>>
>>>
>>>
>>> I guess thats Qt3. For Qt4 you're looking for the composition mode
>>> (found via scanning the QPainter method list for maybe 30 seconds)
>>>
>>> Andreas
>>>
>>>
>>
>> There are no bitwise XOR paint operations in Qt4 AFAIK, only alpha XOR.
>
>
> QRubberBand is designed for this purpose in Qt4.
Thanks Tim,
QRubberBand works for me. It displays a zig-zag white line on a black
background --- costs 4 pixels in thickness, looks not as nice as a thin
XOR line. But it does solve my problem, and I have no attention to
invent a new one.
Thanks,
Lingfa
--
[ signature omitted ]
Message 10 in thread
Lingfa Yang wrote:
> Tim Dewhirst wrote:
>
>> Hi,
>>
>> Luper Rouch wrote:
>>
>>> Andreas Pakulat a écrit :
>>>
>>>> On 23.03.07 14:30:16, Lingfa Yang wrote:
>>>>
>>>>
>>>>> Gert van Loo wrote:
>>>>>
>>>>>
>>>>>> painter.setRasterOp(XorROP);
>>>>>>
>>>>>>
>>>>>
>>>>> error C2039: 'setRasterOp' : is not a member of 'QPainter'
>>>>>
>>>>
>>>>
>>>> I guess thats Qt3. For Qt4 you're looking for the composition mode
>>>> (found via scanning the QPainter method list for maybe 30 seconds)
>>>>
>>>> Andreas
>>>>
>>>>
>>>
>>> There are no bitwise XOR paint operations in Qt4 AFAIK, only alpha XOR.
>>
>>
>> QRubberBand is designed for this purpose in Qt4.
>
> Thanks Tim,
>
> QRubberBand works for me. It displays a zig-zag white line on a black
> background --- costs 4 pixels in thickness, looks not as nice as a
> thin XOR line. But it does solve my problem, and I have no attention
> to invent a new one.
>
A really nice things about QRubberBand is that its styled. Try it out on
WindowXP, its a nice alpha blended blue with rounded edges.
The raster ops were take out of Qt because they no longer work on the mac.
--Justin
begin:vcard
begin:vcard
fn:Justin Noel
n:Noel;Justin
org:ICS;Engineering
adr:;;54B Middlesex Trpk;Bedford;MA;01730;USA
email;internet:justin@xxxxxxx
title:Sr. Consulting Engineer / Certified Qt Instructor
tel;work:(617) 621-0060
url:http://www.ics.com
version:2.1
end:vcard
Message 11 in thread
Luper Rouch wrote:
> Andreas Pakulat a écrit :
>
>> On 23.03.07 14:30:16, Lingfa Yang wrote:
>>
>>
>>> Gert van Loo wrote:
>>>
>>>
>>>
>>>> painter.setRasterOp(XorROP);
>>>>
>>>>
>>>
>>> error C2039: 'setRasterOp' : is not a member of 'QPainter'
>>>
>>
>>
>> I guess thats Qt3. For Qt4 you're looking for the composition mode
>> (found via scanning the QPainter method list for maybe 30 seconds)
>>
>> Andreas
>>
>>
>
> There are no bitwise XOR paint operations in Qt4 AFAIK, only alpha XOR.
>
Yes. I found QPainter::CompositionMode_Xor, which is not the same as the
bitwise Xor.
--
[ signature omitted ]
Message 12 in thread
On 23.03.07 15:11:53, Lingfa Yang wrote:
> Luper Rouch wrote:
>
> >Andreas Pakulat a écrit :
> >
> >>On 23.03.07 14:30:16, Lingfa Yang wrote:
> >>
> >>>Gert van Loo wrote:
> >>>
> >>>
> >>>> painter.setRasterOp(XorROP);
> >>>>
> >>>>
> >>>
> >>>error C2039: 'setRasterOp' : is not a member of 'QPainter'
> >>>
> >>
> >>
> >>I guess thats Qt3. For Qt4 you're looking for the composition mode
> >>(found via scanning the QPainter method list for maybe 30 seconds)
> >>
> >>Andreas
> >>
> >>
> >
> >There are no bitwise XOR paint operations in Qt4 AFAIK, only alpha XOR.
> >
> Yes. I found QPainter::CompositionMode_Xor, which is not the same as the
> bitwise Xor.
See the other answer: QRubberBand exists and you don't need to invent
your own.
Andreas
--
[ signature omitted ]
