C++ Qt Designer 4.6中带有自定义小部件的分段错误
我在Qt Designer 4.6中使用新的Qt小部件时出现了分段错误。尝试预览新小部件时会出现问题 使用gdb时,我发现问题出在qdesigner_internal::WidgetFactory::ApplyStyletoLevel中: Program received signal SIGSEGV, Segmentation fault. qdesigner_internal::WidgetFactory::applyStyleToTopLevel (style=0x0, widget=0x1829df0) at /var/tmp/qt-x11-src-4.6.0/tools/designer/src/lib/shared/widgetfactory.cpp:777 777 /var/tmp/qt-x11-src-4.6.0/tools/designer/src/lib/shared/widgetfactory.cpp: No such file or directory. in /var/tmp/qt-x11-src-4.6.0/tools/designer/src/lib/shared/widgetfactory.cpp (gdb) bt #0 qdesigner_internal::WidgetFactory::applyStyleToTopLevel (style=0x0, widget=0x1829df0) at /var/tmp/qt-x11-src-4.6.0/tools/designer/src/lib/shared/widgetfactory.cpp:777 #1 0x00007ffff7475bed in qdesigner_internal::QDesignerFormBuilder::createPreview (fw=, styleName=..., appStyleSheet=..., deviceProfile=, scriptErrors= 0x7fffffffbee0, errorMessage=0x7fffffffc3f0) at /var/tmp/qt-x11-src-4.6.0/tools/designer/src/lib/shared/qdesigner_formbuilder.cpp:404 #2 0x00007ffff7476773 in qdesigner_internal::QDesignerFormBuilder::createPreview (fw=0x0, styleName=..., appStyleSheet=..., deviceProfile=..., errorMessage=0x0) at /var/tmp/qt-x11-src-4.6.0/tools/designer/src/lib/shared/qdesigner_formbuilder.cpp:439 #3 0x00007ffff7532b27 in qdesigner_internal::PreviewManager::createPreview (this=0x837f20, fw=0x1879200, pc=..., deviceProfileIndex=-1, errorMessage=0x7fffffffc3f0, initialZoom=-1) at /var/tmp/qt-x11-src-4.6.0/tools/designer/src/lib/shared/previewmanager.cpp:686 #4 0x00007ffff75343cf in qdesigner_internal::PreviewManager::showPreview (this=0x837f20, fw=0x1879200, pc=..., deviceProfileIndex=-1, errorMessage=0x7fffffffc3f0) at /var/tmp/qt-x11-src-4.6.0/tools/designer/src/lib/shared/previewmanager.cpp:760 #5 0x00007ffff753472f in qdesigner_internal::PreviewManager::showPreview (this=0x837f20, fw=0x1879200, style=..., deviceProfileIndex=-1, errorMessage=0x7fffffffc3f0) at /var/tmp/qt-x11-src-4.6.0/tools/designer/src/lib/shared/previewmanager.cpp:659 我是Qt新手,这是我的第一个自定义小部件。有人有解决这个问题的线索吗 这是我的小部件代码C++ Qt Designer 4.6中带有自定义小部件的分段错误,c++,qt,qt4,segmentation-fault,qt-designer,C++,Qt,Qt4,Segmentation Fault,Qt Designer,我在Qt Designer 4.6中使用新的Qt小部件时出现了分段错误。尝试预览新小部件时会出现问题 使用gdb时,我发现问题出在qdesigner_internal::WidgetFactory::ApplyStyletoLevel中: Program received signal SIGSEGV, Segmentation fault. qdesigner_internal::WidgetFactory::applyStyleToTopLevel (style=0x0, widget=0x
MBICInput::MBICInput(QWidget *parent) : QStackedWidget(parent){
displayPage = new QWidget();
displayPage->setObjectName(QString::fromUtf8("displayPage"));
inputLB = new QLabel(displayPage);
inputLB->setObjectName(QString::fromUtf8("inputLabel"));
inputLB->setCursor(QCursor(Qt::PointingHandCursor));
addWidget(displayPage);
EditPage = new QWidget();
EditPage->setProperty("EditInputLine", QVariant(true));
EditPage->setObjectName(QString::fromUtf8("EditPage"));
inputInput = new QLineEdit(EditPage);
inputInput->setGeometry(QRect(5, 10, 231, 25));
inputInput->setObjectName(QString::fromUtf8("input"));
addWidget(EditPage);
_animation = new QString("");
_message = new QString("Message");
_validator = new QRegExpValidator(QRegExp("[a-zA-Z]+"), this);
}
MBICInput::~MBICInput() {
}
QValidator::State MBICInput::validate(QString &text, int &pos) const{
return _validator->validate(text, pos);
}
void MBICInput::paintEvent(QPaintEvent *) {
QPainter painter(this);
painter.setRenderHint(QPainter::Antialiasing);
}
QSize MBICInput::minimumSizeHint() const{
return QSize(200, 40);
}
QSize MBICInput::sizeHint() const{
return QSize(200, 40);
}
void MBICInput::setAnimation(const QString &animation){
*_animation = animation;
update();
}
QString MBICInput::animation() const{
return *_animation;
}
void MBICInput::setMessage(const QString &message){
*_message = message;
update();
}
QString MBICInput::message() const{
return *_message;
}
void MBICInput::mousePressEvent(QMouseEvent *event){
if(currentIndex()==0){
setCurrentIndex(1);
}else{
setCurrentIndex(0);
}
update();
}
在
applyStyletoLevel
函数中,您使用的是小部件指针,而没有验证它是否为有效指针。因此,当使用NULL
小部件指针执行widget->style
时,它将崩溃。仅供参考,我刚刚在Qt版本4.5.3-9下编译了相同的代码,它与4.5设计器配合得很好。可能是Qt4.6的错误…是的,我知道,问题是applyStyletoLevel函数不是我的,它是QtDesigner的源代码。我的问题是,我的代码中有什么触发了这样的错误??当你预览小部件时,你使用的是哪种样式?您在哪个操作系统上运行designer?
MBICInput::MBICInput(QWidget *parent) : QStackedWidget(parent){
displayPage = new QWidget();
displayPage->setObjectName(QString::fromUtf8("displayPage"));
inputLB = new QLabel(displayPage);
inputLB->setObjectName(QString::fromUtf8("inputLabel"));
inputLB->setCursor(QCursor(Qt::PointingHandCursor));
addWidget(displayPage);
EditPage = new QWidget();
EditPage->setProperty("EditInputLine", QVariant(true));
EditPage->setObjectName(QString::fromUtf8("EditPage"));
inputInput = new QLineEdit(EditPage);
inputInput->setGeometry(QRect(5, 10, 231, 25));
inputInput->setObjectName(QString::fromUtf8("input"));
addWidget(EditPage);
_animation = new QString("");
_message = new QString("Message");
_validator = new QRegExpValidator(QRegExp("[a-zA-Z]+"), this);
}
MBICInput::~MBICInput() {
}
QValidator::State MBICInput::validate(QString &text, int &pos) const{
return _validator->validate(text, pos);
}
void MBICInput::paintEvent(QPaintEvent *) {
QPainter painter(this);
painter.setRenderHint(QPainter::Antialiasing);
}
QSize MBICInput::minimumSizeHint() const{
return QSize(200, 40);
}
QSize MBICInput::sizeHint() const{
return QSize(200, 40);
}
void MBICInput::setAnimation(const QString &animation){
*_animation = animation;
update();
}
QString MBICInput::animation() const{
return *_animation;
}
void MBICInput::setMessage(const QString &message){
*_message = message;
update();
}
QString MBICInput::message() const{
return *_message;
}
void MBICInput::mousePressEvent(QMouseEvent *event){
if(currentIndex()==0){
setCurrentIndex(1);
}else{
setCurrentIndex(0);
}
update();
}