Singleton instance of QSplashScreen

[prakash02]

since i'm a newbie ,could you please explain how to may use of wrapper class.

[DenisKormalev]

Just create your own custom singleton-class which will have private QSplashScreen field and two public methods: one for setting this field (from place where you are creating splashscreen) and second for setting message.

[prakash02]

Thanks for ur reply..

I have created the singleton class SplashScreen
i'm using this
SplashScreen::getInstance->setMessage();

to set the message at different files.
But still i have a doubt where to initialize QApplication.

[DenisKormalev]

Mmm, QApplication is commonly initialized in main() method. Maybe you mean QSplashScreen? If yes, than I think it will be ok for you to init it in main() too.

[alexander]

@class MySplash : public QSplashScreen
{
Q_OBJECT
public:
explicit MySplash(QObject parent = 0);
static MySplash instance();

private:
MySplash* _inst;
}@
.cpp
@
MySplash MySplash::_inst = 0;
MySplash* MySplash::instance()
{
if ( !_inst )
_inst = new MySplash();
return _inst;
}@

[prakash02]

@class SplashScreen : public QSplashScreen{

public:

static SplashScreen* getInstance();

void destroyInstance();
void SetSplashScreen();
void SetMessage(const std::wstring& message);
QString *splashMessage;
CString progressText;

private:
QSplashScreen *hostSplash_;
SplashScreen() {}

~SplashScreen(){}

static SplashScreen* m_pInstance;

};@.h file

[prakash02]

@SplashScreen* SplashScreen::m_pInstance = NULL;

SplashScreen* SplashScreen::getInstance() {

if(NULL == m_pInstance ) {

m_pInstance = new SplashScreen();

}
return m_pInstance;
}

void SplashScreen::destroyInstance() {

delete m_pInstance;
m_pInstance = NULL;
}

void SplashScreen::SetMessage(const std::wstring& message ) {

progressText = message.c_str();
char pC = (char)(LPCTSTR)progressText ;
splashMessage->append(QString::fromAscii(pC));
hostSplash_->showMessage(*splashMessage);

}
void SplashScreen::SetSplashScreen() {
hostSplash_ = new QSplashScreen(QPixmap(":Resource Files/splash.jpg"));
}@

[alexander]

prakash02, and?

[prakash02]

This is .cpp file.

I initialized the QApplication in main function, but my doubt does i can use the SplashScreen instance other than from main class.

Any help is appreciable.Thanks in advance.

[alexander]

prakash02, @SplashScreen* SplashScreen::m_pInstance = NULL;@ it's C style, it's better to use C++ style:
@SplashScreen* SplashScreen::m_pInstance = 0;@

[alexander]

And why do you use std::wstring instead QString?

[prakash02]

I defined resource file of strings,now i want to use those messages to be display on QSplashScreen when the program execution calls that function which can be on different namespace or on different class.

[DenisKormalev]

Why do you use CString and std::wstring for setting/storing text? Why not QString? Also using CString and LPCTSTR type will break cross-platform compatibility.

[alexander]

Denis Kormalev. :)

[DenisKormalev]

2moderators of this section: please move this thread to more correspondent category (Desktop I think)

[alexander]

prakash02, how do you defiine resource file of strings?

[prakash02]

Yes i can use QString, but previously those are used to display on the native windows dialog.Now I want to change those to QT to improve the look and feel.

[alexander]

try to use QObject::tr("") for strings instead string table in resource file.