!!!A Strange Crash

[hhf]

at a Qt internal function QWidgetPrivate::create_sys

XSetWMProperties(dpy, id, 0, 0,
qApp->d_func()->argv, qApp->d_func()->argc,
&size_hints, &wm_hints, &class_hint);

splash.show(); //the program crash right here

[high_flyer]

we cross posted... see my post before yours.

[hhf]

all the code can run perfectly on win32 platform , crazy me !

XXXSplashScreen::XXXSplashScreen(QWidget *parent, const QPixmap &pixmap, Qt::WindowFlags f)
: QSplashScreen(parent, pixmap, f)
{
	setWindowOpacity(0.9);
}
 
XXXSplashScreen::XXXSplashScreen(QWidget *parent)
: QSplashScreen(parent, QPixmap(":/images/splashscreen.png"), Qt::WindowStaysOnTopHint)
{
	setWindowOpacity(0.9);
}
 
void
XXXSplashScreen::drawContents(QPainter *painter)
{
        int left = 180;
        int top = 15;
        int bottomLimit = 75;
        int rightLimit = width();
        QRect rect(left, top, rightLimit - left, bottomLimit - top);
        QFont titleFont = QApplication::font();
        titleFont.setBold(true);
        titleFont.setPointSize(titleFont.pointSize() + 1);
        painter->setFont(titleFont);
        painter->drawText(rect, Qt::AlignLeft, app().fullName());
}
 
void
XXXSplashScreen::show()
{
        QSplashScreen::show();
	showMessage(QString());
}

XXXSplashScreen::XXXSplashScreen(QWidget *parent, const QPixmap &pixmap, Qt::WindowFlags f)
: QSplashScreen(parent, pixmap, f)
{
	setWindowOpacity(0.9);
}

XXXSplashScreen::XXXSplashScreen(QWidget *parent)
: QSplashScreen(parent, QPixmap(":/images/splashscreen.png"), Qt::WindowStaysOnTopHint)
{
	setWindowOpacity(0.9);
}

void
XXXSplashScreen::drawContents(QPainter *painter)
{
        int left = 180;
        int top = 15;
        int bottomLimit = 75;
        int rightLimit = width();
        QRect rect(left, top, rightLimit - left, bottomLimit - top);
        QFont titleFont = QApplication::font();
        titleFont.setBold(true);
        titleFont.setPointSize(titleFont.pointSize() + 1);
        painter->setFont(titleFont);
        painter->drawText(rect, Qt::AlignLeft, app().fullName());
}

void
XXXSplashScreen::show()
{
        QSplashScreen::show();
	showMessage(QString());
}

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more nasty , it run fine in debug mode , but get a 'Segmentation fault' in release mode.

[high_flyer]

it could be that due to configuration issues, your image is not found, and thus you get a null pixmap.
Try this:

XXXSplashScreen splash; //XXXSplashScreen encapsulate the QSplashScreen
if(splsh.pixmap().isNull()){
  qDebug()<<"nuill pixmap";
}
 
splash.show(); //the program crash right here
app.setWindowIcon(QIcon());

XXXSplashScreen splash; //XXXSplashScreen encapsulate the QSplashScreen
if(splsh.pixmap().isNull()){
  qDebug()<<"nuill pixmap";
}

splash.show(); //the program crash right here
app.setWindowIcon(QIcon());

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and see if the debug message comes out, or you can set a break point on the debug message.

[hhf]

the debug message didn't come out, the image can be found..

[hhf]

since it crash only in release mode, breakpoints set in the code can not work.
how to make the program debug-able in release mode?

[high_flyer]

how to make the program debug-able in release mode?

you can put a debug message in all the methods at the beginning, and at the end, this way you will see which method started but didn't complete.
It will help narrow down where the problem is.

[hhf]

thank you so much .
boss passed this job back to the author already .
but now I face to a bigger challenge, a man came back to Canada, leaving a 'mess' for me, he use french to name all the variables ,macros and things like that ...I don't know french at all, the code seem unfriendly to me, nightmare

[high_flyer]

Well, that is not something I can help you with, I am afraid...