Application crashes at subclassed QMainWindow argv reading
Solved
General and Desktop
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I am using macOS 13.4 (Ventura) developing projects in Qt 6.5.1.
When I am developing my own Qt project, while its app modifier and controller is by subclassing QApplication, the app crashes at the point where the application starts with an argument that the Qt builtin's one doesn't recognized. For example,
./App.app/Contents/MacOs/App --reverseThis command works without exit abnormally. However,
./App.app/Contents/MacOs/App asdfIt crashes, saying it's caused by a segment fault (exit code 11 with BAD_ACCESS, and of course without a proper display of help message saying that the
asdfparameter is not recognized. It just crashed. This also greatly affects the initial file path to be processed contained in theargvpointer list, like:./App.app/Contents/MacOs/App /Users/User/Desktop/test.txtCrashed.
Here are the Minimal Reproducible Example:
BrStormTextApplication.hpp
#ifndef BRSTORMTEXTAPPLICATION_HPP #define BRSTORMTEXTAPPLICATION_HPP #include <QApplication> #include <QEvent> class BrStormTextApplication : public QApplication { Q_OBJECT public: BrStormTextApplication(int argc, char *argv[]); public slots: void setConstructed(bool c) {m_c = c;} public: bool event(QEvent *event) override; signals: void fileOpened(QString file); private: bool m_c = false; }; #endif // BRSTORMTEXTAPPLICATION_HPPBrStormTextApplication.cpp
#include "BrStormTextApplication.hpp" #include "BrStormTextMainWindow.hpp" #include <QFile> #include <QFileOpenEvent> BrStormTextApplication::BrStormTextApplication(int argc, char *argv[]) : QApplication(argc, argv) { setApplicationDisplayName(tr("StormText")); setApplicationName("BrStormText"); setApplicationVersion(tr("0.7.0 (beta)")); setObjectName("BrStormTextApplication"); } bool BrStormTextApplication::event(QEvent *event) { if (event->type() == QEvent::FileOpen && m_c) { QFileOpenEvent *e = static_cast<QFileOpenEvent*>(event); emit fileOpened(e->file()); } return QApplication::event(event); }BrStormTextMainWindow.hpp
#ifndef BRSTORMTEXTMAINWINDOW_HPP #define BRSTORMTEXTMAINWINDOW_HPP #include <QAction> #include <QActionGroup> #include <QDockWidget> #include <QFileSystemModel> #include <QMainWindow> #include <QMenu> #include <QMenuBar> #include <QToolButton> #include <QTreeView> #include "BrStormTextTab.hpp" #include "BrStormTextStatusBar.hpp" #include "BrStormTextDialogs/BrStormTextAboutApplicationDialog.hpp" #include "BrStormTextDialogs/BrStormTextAboutDialog.hpp" #include "BrStormTextDialogs/BrStormTextGotoDialog.hpp" #include "BrStormTextFindDock.hpp" class BrStormTextApplication; class BrStormTextMainWindow : public QMainWindow { Q_OBJECT public: BrStormTextMainWindow(QList<QString> argv, BrStormTextApplication *app, int u = 0, bool o = false, QWidget *parent = nullptr); public: void closeEvent(QCloseEvent *event); public slots: void openThroughArgs(QString path); private: void initUi(); void initMenus(); void initFileMenu(); ... void initHelpMenu(); void initActionGroups(); void initTabs(); void initStatusBar(); void initFileBrowser(); void initFindDock(); void initSignals(); private slots: ... // Other non-related methods private: ... // Menus, tree views and list views BrStormTextTab *m_tab; private: int m_untitled; BrStormTextApplication *m_app; }; #endif // BRSTORMTEXTMAINWINDOW_HPPBrStormTextMainWindow.cpp
#include "BrStormTextMainWindow.hpp" #include "BrStormTextEditor.hpp" #include "BrStormTextDialogs/BrStormTextOpenDialog.hpp" #include "BrStormTextDialogs/BrStormTextSaveCopyToDialog.hpp" #include "BrStormTextDialogs/BrStormTextSaveDialog.hpp" #include "BrStormTextApplication.hpp" #include <QCloseEvent> #include <QDir> #include <QFile> #include <QFileInfo> #include <QFileIconProvider> #include <QHeaderView> #include <QMessageBox> #include <Qsci/qscilexer.h> #include <QTextStream> BrStormTextMainWindow::BrStormTextMainWindow(QList<QString> argv, BrStormTextApplication *app, int u, bool o, QWidget *parent) : QMainWindow(parent) { m_untitled = u; m_app = app; initUi(); if (o) openFile(true); for (const QString &str : argv) { openThroughArgs(str); } } void BrStormTextMainWindow::openThroughArgs(QString path) { QFile f(path); if (!m_tab) return; if (!f.exists()) { QMessageBox msg = QMessageBox(this); msg.setWindowModality(Qt::WindowModal); msg.setWindowTitle(tr("FileNoutFoundError")); msg.setIcon(QMessageBox::Critical); msg.setText(tr("Sorry, the file you have selected does not exists.")); msg.setInformativeText(tr("Check if you have misspelt the file name," "the file path or check your network connections. \n" "BR_STORMTEXT_0x00003855")); msg.setStandardButtons(QMessageBox::Ok); msg.exec(); return; } if (f.open(QFile::ReadOnly | QFile::Text)) { QTextStream ts(&f); QString c = ts.readAll(); QFileInfo fi(f); QFileIconProvider fip; QIcon icns = fip.icon(fi); QString ce = fi.completeSuffix().toLower(); BrStormTextEditor *ed; ed = new BrStormTextEditor(); ed->setText(c); connect(ed, &BrStormTextEditor::modificationChanged, this, [=](bool m){setWindowModified(m);}); if (ce == "avs") { ed->setLexerAVS(true); } else if (ce == "sh" || ce == "bash") { ed->setLexerBash(true); } else if (ce == "bat" || ce =="cmd" || ce == "btm") { ed->setLexerBatch(true); } else if (ce == "cpp" || ce == "cxx" || ce == "cc" || ce == "ii" || ce == "h" || ce == "hpp" || ce == "hxx") { ed->setLexerCPP(true); } ...... else if (ce == "xml" || ce == "svg" || ce == "svgx" || ce == "plist" || ce == "string" || ce == "qrc" || ce == "rc" || ce == "ui" || c.startsWith("<?xml version=")) { ed->setLexerXML(true); } else if (ce == "yml") { ed->setLexerYAML(true); } int i = m_tab->addTab(ed, icns, fi.fileName()); m_tab->setTabToolTip(i, fi.absoluteFilePath()); m_tab->setCurrentIndex(i); m_tab->currentTab()->setModified(false); setWindowModified(m_tab->currentTab()->isModified()); } else { QMessageBox msg = QMessageBox(this); msg.setWindowModality(Qt::WindowModal); msg.setWindowTitle(tr("OSError")); msg.setIcon(QMessageBox::Critical); msg.setText(tr("Sorry, the file you have selected cannot be opened.")); msg.setInformativeText(tr("This might be caused by inconsistence file access," "Or the disconnection of your current network " "condition. Try to contact your technical manager / " "system administrator for more information / solution. \n" "BR_STORMTEXT_0x00000094")); msg.setStandardButtons(QMessageBox::Ok); msg.exec(); return; } f.close(); return; } void BrStormTextMainWindow::initUi() { m_aAppD = new BrStormTextAboutApplicationDialog(this); ... initMenus(); initTabs(); initStatusBar(); initFileBrowser(); initFindDock(); initSignals(); connect(m_app, SIGNAL(fileOpened(QString)), this, SLOT(openThroughArgs(QString))); } ...main.cpp
#include "BrStormTextApplication.hpp" #include "BrStormTextMainWindow.hpp" int main(int argc, char *argv[]) { try { QList<QString> argvFiles = {}; if (argc >= 2) { for (int i = 1; i < argc; i++) { if (QFile(QString(argv[i])).exists()) argvFiles.push_back(QString(argv[i])); } } BrStormTextApplication app(argc, argv); BrStormTextMainWindow mw(argvFiles, &app); app.setConstructed(true); mw.showMaximized(); return app.exec(); } catch (std::exception &e) { Q_UNUSED(e) return 1; } }PS I am making a text editor using the QScintilla framework. Document at https://brdocumentation.github.io/qscintilla/index.html for reference.
I am very wondering what I am wrong. Thanks for every work and views! Appreciate.
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Your argc is wrong. It must be a reference according to the documentation. There is even a big red note. Reading the docs sometimes helps.
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Here are the crash report:
------------------------------------- Translated Report (Full Report Below) ------------------------------------- Process: StormText [7554] Path: /Users/USER/*/StormText.app/Contents/MacOS/StormText Identifier: org.**************************.StormText Version: ??? Code Type: X86-64 (Native) Parent Process: zsh [5594] Responsible: Terminal [3425] User ID: 501 Date/Time: 2023-08-03 17:16:41.2890 +0800 OS Version: macOS 13.4 (22F66) Report Version: 12 Anonymous UUID: 4566117B-****-****-****-07A965E31605 Time Awake Since Boot: 21000 seconds System Integrity Protection: enabled Crashed Thread: 0 Dispatch queue: com.apple.main-thread Exception Type: EXC_BAD_ACCESS (SIGSEGV) Exception Codes: UNKNOWN_0xD at 0x0000000000000000 Exception Codes: 0x000000000000000d, 0x0000000000000000 Termination Reason: Namespace SIGNAL, Code 11 Segmentation fault: 11 Terminating Process: exc handler [7554] VM Region Info: 0 is not in any region. Bytes before following region: 4543410176 REGION TYPE START - END [ VSIZE] PRT/MAX SHRMOD REGION DETAIL UNUSED SPACE AT START ---> __TEXT 10ecef000-10ed87000 [ 608K] r-x/r-x SM=COW ...cOS/StormText Thread 0 Crashed:: Dispatch queue: com.apple.main-thread 0 libsystem_platform.dylib 0x7ff81b4c1f12 _platform_strlen + 18 1 QtCore 0x111f1a062 QCoreApplication::arguments() + 146 2 libqcocoa.dylib 0x10f17703f 0x10f16c000 + 45119 3 AppKit 0x7ff81ea214af -[NSApplication _doOpenFile:ok:tryTemp:] + 267 4 AppKit 0x7ff81e5f7463 -[NSApplication finishLaunching] + 2076 5 AppKit 0x7ff81e5f6998 -[NSApplication run] + 250 6 libqcocoa.dylib 0x10f1835b7 0x10f16c000 + 95671 7 QtCore 0x111f20f36 QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) + 486 8 QtCore 0x111f17d27 QCoreApplication::exec() + 119 9 StormText 0x10ed36a57 main + 919 10 dyld 0x10f6ad41f start + 1903 Thread 1: 0 libsystem_pthread.dylib 0x7ff81b492bb0 start_wqthread + 0 Thread 2: 0 libsystem_pthread.dylib 0x7ff81b492bb0 start_wqthread + 0 Thread 3: 0 libsystem_pthread.dylib 0x7ff81b492bb0 start_wqthread + 0 Thread 4: 0 libsystem_pthread.dylib 0x7ff81b492bb0 start_wqthread + 0 Thread 5: 0 libsystem_pthread.dylib 0x7ff81b492bb0 start_wqthread + 0 Thread 6:: Thread (pooled) 0 libsystem_kernel.dylib 0x10ee200ee __psynch_cvwait + 10 1 libsystem_pthread.dylib 0x7ff81b497758 _pthread_cond_wait + 1242 2 QtCore 0x1120b5fac 0x111ea9000 + 2150316 3 QtCore 0x1120b5cae 0x111ea9000 + 2149550 4 QtCore 0x1120b5bfe QWaitCondition::wait(QMutex*, QDeadlineTimer) + 94 5 QtCore 0x1120affd5 0x111ea9000 + 2125781 6 QtCore 0x1120abab3 0x111ea9000 + 2108083 7 libsystem_pthread.dylib 0x7ff81b4971d3 _pthread_start + 125 8 libsystem_pthread.dylib 0x7ff81b492bd3 thread_start + 15 Thread 7:: Thread (pooled) 0 libsystem_kernel.dylib 0x10ee200ee __psynch_cvwait + 10 1 libsystem_pthread.dylib 0x7ff81b497758 _pthread_cond_wait + 1242 2 QtCore 0x1120b5fac 0x111ea9000 + 2150316 3 QtCore 0x1120b5cae 0x111ea9000 + 2149550 4 QtCore 0x1120b5bfe QWaitCondition::wait(QMutex*, QDeadlineTimer) + 94 5 QtCore 0x1120affd5 0x111ea9000 + 2125781 6 QtCore 0x1120abab3 0x111ea9000 + 2108083 7 libsystem_pthread.dylib 0x7ff81b4971d3 _pthread_start + 125 8 libsystem_pthread.dylib 0x7ff81b492bd3 thread_start + 15 Thread 8:: Thread (pooled) 0 libsystem_kernel.dylib 0x10ee200ee __psynch_cvwait + 10 1 libsystem_pthread.dylib 0x7ff81b497758 _pthread_cond_wait + 1242 2 QtCore 0x1120b5fac 0x111ea9000 + 2150316 3 QtCore 0x1120b5cae 0x111ea9000 + 2149550 4 QtCore 0x1120b5bfe QWaitCondition::wait(QMutex*, QDeadlineTimer) + 94 5 QtCore 0x1120affd5 0x111ea9000 + 2125781 6 QtCore 0x1120abab3 0x111ea9000 + 2108083 7 libsystem_pthread.dylib 0x7ff81b4971d3 _pthread_start + 125 8 libsystem_pthread.dylib 0x7ff81b492bd3 thread_start + 15 Thread 9:: Thread (pooled) 0 libsystem_kernel.dylib 0x10ee200ee __psynch_cvwait + 10 1 libsystem_pthread.dylib 0x7ff81b497758 _pthread_cond_wait + 1242 2 QtCore 0x1120b5fac 0x111ea9000 + 2150316 3 QtCore 0x1120b5cae 0x111ea9000 + 2149550 4 QtCore 0x1120b5bfe QWaitCondition::wait(QMutex*, QDeadlineTimer) + 94 5 QtCore 0x1120affd5 0x111ea9000 + 2125781 6 QtCore 0x1120abab3 0x111ea9000 + 2108083 7 libsystem_pthread.dylib 0x7ff81b4971d3 _pthread_start + 125 8 libsystem_pthread.dylib 0x7ff81b492bd3 thread_start + 15 Thread 10:: QFileInfoGatherer 0 libsystem_kernel.dylib 0x10ee200ee __psynch_cvwait + 10 1 libsystem_pthread.dylib 0x7ff81b497758 _pthread_cond_wait + 1242 2 QtCore 0x1120b5c8b 0x111ea9000 + 2149515 3 QtCore 0x1120b5bfe QWaitCondition::wait(QMutex*, QDeadlineTimer) + 94 4 QtGui 0x10fc21e6d QFileInfoGatherer::run() + 125 5 QtCore 0x1120abab3 0x111ea9000 + 2108083 6 libsystem_pthread.dylib 0x7ff81b4971d3 _pthread_start + 125 7 libsystem_pthread.dylib 0x7ff81b492bd3 thread_start + 15 Thread 0 crashed with X86 Thread State (64-bit): rax: 0x00007ff7b1210938 rbx: 0x6261747563657865 rcx: 0x6261747563657865 rdx: 0x6261747563657865 rdi: 0x6261747563657860 rsi: 0x0000000000007fd7 rbp: 0x00007ff7b120fb50 rsp: 0x00007ff7b120fb50 r8: 0x00007fb3863ae010 r9: 0x00007ff7b120fc10 r10: 0x00000000000004e0 r11: 0x00006000003c193c r12: 0x0000000000000021 r13: 0x0000000000007ff7 r14: 0x00007ff7b120fb68 r15: 0x00007ff7b120fc00 rip: 0x00007ff81b4c1f12 rfl: 0x0000000000010206 cr2: 0x00007fb3863ae000 Logical CPU: 0 Error Code: 0x00000000 Trap Number: 13 Thread 0 instruction stream: 29 07 c5 fc 29 47 20 48-83 c7 40 48 83 ea 40 77 )...)G H..@H..@w ed c5 fc 11 04 17 c5 fc-11 44 17 20 c5 f8 77 5d .........D. ..w] c3 48 89 34 17 48 83 ea-08 73 f6 48 83 c2 08 74 .H.4.H...s.H...t 0b 40 88 74 17 ff 48 83-ea 01 75 f5 5d c3 90 90 .@.t..H...u.]... 90 90 90 90 90 90 90 90-90 90 90 90 90 90 55 48 ..............UH 89 e5 48 89 f9 48 89 fa-48 83 e7 f0 66 0f ef c0 ..H..H..H...f... [66]0f 74 07 66 0f d7 f0-48 83 e1 0f 48 83 c8 ff f.t.f...H...H... <== 48 d3 e0 21 c6 74 17 0f-bc c6 48 29 d7 48 01 f8 H..!.t....H).H.. 5d c3 66 2e 0f 1f 84 00-00 00 00 00 66 90 48 83 ].f.........f.H. c7 10 66 0f ef c0 66 0f-74 07 66 0f d7 f0 85 f6 ..f...f.t.f..... 74 ec eb d3 65 48 8b 0c-25 18 00 00 00 41 89 c8 t...eH..%....A.. 31 c0 f0 4c 0f b1 07 0f-85 7a 1f 00 00 e9 00 00 1..L.....z...... Binary Images: 0x10f6a7000 - 0x10f742fff dyld (*) <5db85b72-c63a-3182-91e5-5c942ec30e48> /usr/lib/dyld 0x10ecef000 - 0x10ed86fff org.BrightSoftwareFoundation.StormText (0.7.0 (beta)) <00940740-e0d2-3a3e-ae3d-7e7061aac7ec> /Users/USER/*/StormText.app/Contents/MacOS/StormText 0x10f2de000 - 0x10f501fff libqscintilla2_qt6.15.2.0.dylib (*) <ac050aa8-5999-3d76-a862-44b353aea2fa> /Users/USER/*/libqscintilla2_qt6.15.2.0.dylib 0x10ef08000 - 0x10ef4ffff org.qt-project.QtPrintSupport (6.5) <d82cf849-dcbb-3952-9df7-b3e49d987965> /Users/USER/*/QtPrintSupport.framework/Versions/A/QtPrintSupport 0x110365000 - 0x11081cfff org.qt-project.QtWidgets (6.5) <76764adf-2707-3561-a2d4-9d1ea12d1646> /Users/USER/*/QtWidgets.framework/Versions/A/QtWidgets 0x10f7a7000 - 0x10fe86fff org.qt-project.QtGui (6.5) <38f8e919-bceb-3ecc-9459-4678276a9bfb> /Users/USER/*/QtGui.framework/Versions/A/QtGui 0x110e84000 - 0x111063fff com.apple.Metal (306.7.4) <6581cd53-8583-38d1-b4b9-773f1dc3f551> /System/Library/Frameworks/Metal.framework/Versions/A/Metal 0x111ea9000 - 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By the way even if I use the
QCoreApplication::arguments().at(for i in range(...))instead of using rawargvdirectly it still gave me the exactly 100% same crash report, sayingCODE_11__BAD_ACCESS segment fault:... BrStormTextApplication app(argc, argv); QList<QString> argvFiles = {}; if (app.arguments().length() >= 2) { for (const QString &str : app.arguments()) { if (QFile(str).exists()) argvFiles.push_back(str); } } BrStormTextMainWindow mw(argvFiles, &app); app.setConstructed(true); mw.showMaximized(); return app.exec(); } ... -
@JackMyson said in Application crashes at subclassed QMainWindow argv reading:
if (argc >= 2)
{
for (int i = 1; i < argc; i++)
{
if (QFile(QString(argv[i])).exists()) argvFiles.push_back(QString(argv[i]));
}
}Why are you doing this? Your main window can get the application parameters from QApplication (using qApp) at any time. Also, stack trace after the crash could help to identify the issue.
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@jsulm
've removed the line:QList<QString> argvFiles = {}; /*if (argc >= 2) { for (int i = 1; i < argc; i++) { if (QFile(QString(argv[i])).exists()) argvFiles.push_back(QString(argv[i])); } }*/But still the same error:
zsh: segmentation fault ./StormText /Users/.../lang-avs.avs -
Your argc is wrong. It must be a reference according to the documentation. There is even a big red note. Reading the docs sometimes helps.
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Hi @JackMyson,
Among other issues, your
BrStormTextMainWindow::m_tabpointer is being dereferenced without ever being initialised (unless you've dropped the initialisation code out of the sample).Have you tried running this with the debugger?
Cheers.
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Hi @Paul-Colby ,
Even my Qt Creator 4 built-in debugger ran out of luck: crashed because of the same segment fault, before even the application window has shown.
Also thanks for your meticulous observations, I have really dropped the initialisation statement “m_tab = tabs;” out of the MRE.
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J JackMyson has marked this topic as solved on
