Displaying an image file with QImage

newer
Rusty oldtimer (newbie now) in gcc...

Prabu Subroto

17 Sep 2004 17 Sep '04

13:16

Dear my friends... I use SuSE 9.1 and Qt 3.2 . I am writing a database program with Qt. I have an image file named "1.png", I want this image file displayed in a Dialog Form. Anybody would be so generous to give me a very simple sample code how to display an image file into a Dialog Form with QImage? All I know only this step : QImage::QImage("images/1.png"); Please give me a very simple sample code. Thank you very much in advance. _______________________________ Do you Yahoo!? Declare Yourself - Register online to vote today! http://vote.yahoo.com

Show replies by date

Jeroen Wijnhout

17 Sep 17 Sep

13:30

New subject: [suse-programming-e] Displaying an image file with QImage

On Friday 17 September 2004 15:16, Prabu Subroto wrote:

...

Dear my friends...

I use SuSE 9.1 and Qt 3.2 . I am writing a database program with Qt.

I have an image file named "1.png", I want this image file displayed in a Dialog Form.

Anybody would be so generous to give me a very simple sample code how to display an image file into a Dialog Form with QImage?

All I know only this step : QImage::QImage("images/1.png");

Please give me a very simple sample code.

You can use QLabel, instead of giving it a textual label, you give it an pixmap. QLabel *lb = new QLabel(this); lb->setPixmap("images/1.png"); Insert the QLabel into your dialog as usual. best, Jeroen

Prabu Subroto

13:51

New subject: [suse-programming-e] Displaying an image file with QImage

Hallo Jeroen. Firstly, thank you for your answer. I did like this in depanForm.ui.h : #include #include void depanForm::init() { QLabel * lb = new QLabel(this); lb->setPixmap("images/1.png"); } As I compiled this simple code (as my first try), I get this error message : patrixlinux@patrix:~/arsip/proyek/qt/10> make g++ -c -pipe -O2 -march=i586 -mcpu=i686 -fmessage-length=0 -Wall -fPIC -Wall -W -O2 -march=i586 -mcpu=i686 -fmessage-length=0 -Wall -fPIC -DQT_NO_DEBUG -DQT_SHARED -DQT_TABLET_SUPPORT -I/usr/lib/qt3/mkspecs/default -I. -I. -I/usr/include -I/usr/lib/qt3/include -o depanform.o depanform.cpp In file included from depanform.cpp:19: depanform.ui.h: In member function `virtual void depanForm::init()': depanform.ui.h:15: error: no matching function for call to `QLabel::setPixmap(const char[13])' /usr/lib/qt3/include/qlabel.h:104: error: candidates are: virtual void QLabel::setPixmap(const QPixmap&) make: *** [depanform.o] Error 1 patrixlinux@patrix:~/arsip/proyek/qt/10> Why does it happen? Please tell me. Thank you very much in advance. Newbie in Qt, Prabu. --- Jeroen Wijnhout wrote:

...

On Friday 17 September 2004 15:16, Prabu Subroto wrote:

...
Dear my friends...

I use SuSE 9.1 and Qt 3.2 . I am writing a database program with Qt.

I have an image file named "1.png", I want this image file displayed in a Dialog Form.

Anybody would be so generous to give me a very simple sample code how to display an image file into a Dialog Form with QImage?

All I know only this step : QImage::QImage("images/1.png");

Please give me a very simple sample code.

You can use QLabel, instead of giving it a textual label, you give it an pixmap.

QLabel *lb = new QLabel(this); lb->setPixmap("images/1.png");

Insert the QLabel into your dialog as usual.

best, Jeroen

-- To unsubscribe, email: suse-programming-e-unsubscribe@suse.com For additional commands, email: suse-programming-e-help@suse.com Archives can be found at: http://lists.suse.com/archive/suse-programming-e

_______________________________ Do you Yahoo!? Declare Yourself - Register online to vote today! http://vote.yahoo.com

Jeroen Wijnhout

14:08

New subject: [suse-programming-e] Displaying an image file with QImage

On Friday 17 September 2004 15:51, Prabu Subroto wrote:

...

Hallo Jeroen.

Firstly, thank you for your answer.

I did like this in depanForm.ui.h :

#include #include

void depanForm::init() { QLabel * lb = new QLabel(this); lb->setPixmap("images/1.png"); }

Oops, lb->setPixmap(QPixmap("images/1.png")); see the QPixmap docs for more info. best, Jeroen

Brad Bourn

14:10

New subject: [suse-programming-e] Displaying an image file with QImage

make sure the compiler knows what you are doing. You need to include qlabel.h. #include B-) On Friday 17 September 2004 07:51 am, Prabu Subroto wrote:

...

Hallo Jeroen.

Firstly, thank you for your answer.

I did like this in depanForm.ui.h :

#include #include

void depanForm::init() { QLabel * lb = new QLabel(this); lb->setPixmap("images/1.png"); }

As I compiled this simple code (as my first try), I get this error message : patrixlinux@patrix:~/arsip/proyek/qt/10> make g++ -c -pipe -O2 -march=i586 -mcpu=i686 -fmessage-length=0 -Wall -fPIC -Wall -W -O2 -march=i586 -mcpu=i686 -fmessage-length=0 -Wall -fPIC -DQT_NO_DEBUG -DQT_SHARED -DQT_TABLET_SUPPORT -I/usr/lib/qt3/mkspecs/default -I. -I. -I/usr/include -I/usr/lib/qt3/include -o depanform.o depanform.cpp In file included from depanform.cpp:19: depanform.ui.h: In member function `virtual void depanForm::init()': depanform.ui.h:15: error: no matching function for call to `QLabel::setPixmap(const char[13])' /usr/lib/qt3/include/qlabel.h:104: error: candidates are: virtual void QLabel::setPixmap(const QPixmap&) make: *** [depanform.o] Error 1 patrixlinux@patrix:~/arsip/proyek/qt/10>

Why does it happen?

Please tell me.

Thank you very much in advance.

Newbie in Qt, Prabu.

--- Jeroen Wijnhout wrote:

...
On Friday 17 September 2004 15:16, Prabu Subroto

wrote:

...
Dear my friends...

I use SuSE 9.1 and Qt 3.2 . I am writing a

database

...
program with Qt.

I have an image file named "1.png", I want this

image

...
file displayed in a Dialog Form.

Anybody would be so generous to give me a very

simple

...
sample code how to display an image file into a

Dialog

...
Form with QImage?

All I know only this step : QImage::QImage("images/1.png");

Please give me a very simple sample code.

You can use QLabel, instead of giving it a textual label, you give it an pixmap.

QLabel *lb = new QLabel(this); lb->setPixmap("images/1.png");

Insert the QLabel into your dialog as usual.

best, Jeroen

-- To unsubscribe, email: suse-programming-e-unsubscribe@suse.com For additional commands, email: suse-programming-e-help@suse.com Archives can be found at: http://lists.suse.com/archive/suse-programming-e

_______________________________ Do you Yahoo!? Declare Yourself - Register online to vote today! http://vote.yahoo.com

Brad Bourn

14:12

New subject: [suse-programming-e] Displaying an image file with QImage

oops, maybe since QPixmap() has the overloaded constructor QPixmap::QPixmap(QImage* image) B-) On Friday 17 September 2004 07:51 am, Prabu Subroto wrote:

...

Hallo Jeroen.

Firstly, thank you for your answer.

I did like this in depanForm.ui.h :

#include #include

void depanForm::init() { QLabel * lb = new QLabel(this); lb->setPixmap("images/1.png"); }

As I compiled this simple code (as my first try), I get this error message : patrixlinux@patrix:~/arsip/proyek/qt/10> make g++ -c -pipe -O2 -march=i586 -mcpu=i686 -fmessage-length=0 -Wall -fPIC -Wall -W -O2 -march=i586 -mcpu=i686 -fmessage-length=0 -Wall -fPIC -DQT_NO_DEBUG -DQT_SHARED -DQT_TABLET_SUPPORT -I/usr/lib/qt3/mkspecs/default -I. -I. -I/usr/include -I/usr/lib/qt3/include -o depanform.o depanform.cpp In file included from depanform.cpp:19: depanform.ui.h: In member function `virtual void depanForm::init()': depanform.ui.h:15: error: no matching function for call to `QLabel::setPixmap(const char[13])' /usr/lib/qt3/include/qlabel.h:104: error: candidates are: virtual void QLabel::setPixmap(const QPixmap&) make: *** [depanform.o] Error 1 patrixlinux@patrix:~/arsip/proyek/qt/10>

Why does it happen?

Please tell me.

Thank you very much in advance.

Newbie in Qt, Prabu.

--- Jeroen Wijnhout wrote:

...
On Friday 17 September 2004 15:16, Prabu Subroto

wrote:

...
Dear my friends...

I use SuSE 9.1 and Qt 3.2 . I am writing a

database

...
program with Qt.

I have an image file named "1.png", I want this

image

...
file displayed in a Dialog Form.

Anybody would be so generous to give me a very

simple

...
sample code how to display an image file into a

Dialog

...
Form with QImage?

All I know only this step : QImage::QImage("images/1.png");

Please give me a very simple sample code.

You can use QLabel, instead of giving it a textual label, you give it an pixmap.

QLabel *lb = new QLabel(this); lb->setPixmap("images/1.png");

Insert the QLabel into your dialog as usual.

best, Jeroen

-- To unsubscribe, email: suse-programming-e-unsubscribe@suse.com For additional commands, email: suse-programming-e-help@suse.com Archives can be found at: http://lists.suse.com/archive/suse-programming-e

_______________________________ Do you Yahoo!? Declare Yourself - Register online to vote today! http://vote.yahoo.com

Stefan Hundhammer

13:35

New subject: [suse-programming-e] Displaying an image file with QImage

On Friday 17 September 2004 15:16, Prabu Subroto wrote:

...

I have an image file named "1.png", I want this image file displayed in a Dialog Form.

Anybody would be so generous to give me a very simple sample code how to display an image file into a Dialog Form with QImage?

All I know only this step : QImage::QImage("images/1.png");

QImage is almost always the wrong choice. Use a QLabel with a QPixmap in it. QImage is for doing heavy image processing, not for simple displaying. CU -- Stefan Hundhammer Penguin by conviction. YaST2 Development SuSE Linux AG Nuernberg, Germany

Brad Bourn

13:46

New subject: [suse-programming-e] Displaying an image file with QImage

Create a QWidget The use the setPaletteBackgroundPixmap() to set it's background image (pixmap) to your file. QWidget* wig = new QWidget(this); wig->setPaletteBackgroundPixmap(QPixmap::QPixmap(QImage::QImage("images/1.png"))); wig->show(); B-) On Friday 17 September 2004 07:16 am, Prabu Subroto wrote:

...

Dear my friends...

I use SuSE 9.1 and Qt 3.2 . I am writing a database program with Qt.

I have an image file named "1.png", I want this image file displayed in a Dialog Form.

Anybody would be so generous to give me a very simple sample code how to display an image file into a Dialog Form with QImage?

All I know only this step : QImage::QImage("images/1.png");

Please give me a very simple sample code.

Thank you very much in advance.

_______________________________ Do you Yahoo!? Declare Yourself - Register online to vote today! http://vote.yahoo.com

Stefan Hundhammer

14:32

New subject: [suse-programming-e] Displaying an image file with QImage

On Friday 17 September 2004 15:46, Brad Bourn wrote:

...

Create a QWidget The use the setPaletteBackgroundPixmap() to set it's background image (pixmap) to your file.

QWidget* wig = new QWidget(this); wig->setPaletteBackgroundPixmap(QPixmap::QPixmap(QImage::QImage("images/1.p ng"))); wig->show();

That approach has drawbacks: If the widget's size is larger or smaller than the pixmap's size, the pixmap is replicated (tiled) or cut off. That might even be desired in some cases, but in general it is not. The advantage is that this kind of pixmap is repainted automatically by the X server, so that is really fast - the pixmap appears first on the screen, even before widget boundaries are rendered. CU -- Stefan Hundhammer Penguin by conviction. YaST2 Development SuSE Linux AG Nuernberg, Germany

Brad Bourn

15:08

New subject: [suse-programming-e] Displaying an image file with QImage

You can also use transparencies, and you can scale the image to fit the widget. You can also move around, show & hide, treat as top level widget, etc. B-) On Friday 17 September 2004 08:32 am, Stefan Hundhammer wrote:

...

On Friday 17 September 2004 15:46, Brad Bourn wrote:

...
Create a QWidget The use the setPaletteBackgroundPixmap() to set it's background image (pixmap) to your file.

QWidget* wig = new QWidget(this); wig->setPaletteBackgroundPixmap(QPixmap::QPixmap(QImage::QImage("images/1 .p ng"))); wig->show();

That approach has drawbacks: If the widget's size is larger or smaller than the pixmap's size, the pixmap is replicated (tiled) or cut off. That might even be desired in some cases, but in general it is not.

The advantage is that this kind of pixmap is repainted automatically by the X server, so that is really fast - the pixmap appears first on the screen, even before widget boundaries are rendered.

CU -- Stefan Hundhammer Penguin by conviction. YaST2 Development SuSE Linux AG Nuernberg, Germany

7169

Age (days ago)

7169

Last active (days ago)

List overview

Download

9 comments

4 participants

participants (4)

Brad Bourn
Jeroen Wijnhout
Prabu Subroto
Stefan Hundhammer