C++ qt_error_string函数代码示例

/*!
    \internal
*/
bool QFSFileEnginePrivate::closeFdFh()
{
    Q_Q(QFSFileEngine);
    if (fd == -1 && !fh)
        return false;

    // Flush the file if it's buffered, and if the last flush didn't fail.
    bool flushed = !fh || (!lastFlushFailed && q->flush());
    bool closed = true;
    tried_stat = 0;

    // Close the file if we created the handle.
    if (closeFileHandle) {
        int ret;
        do {
            if (fh) {
                // Close buffered file.
                ret = fclose(fh) != 0 ? -1 : 0;
            } else {
                // Close unbuffered file.
                ret = QT_CLOSE(fd);
            }
        } while (ret == -1 && errno == EINTR);

        // We must reset these guys regardless; calling close again after a
        // failed close causes crashes on some systems.
        fh = 0;
        fd = -1;
        closed = (ret == 0);
    }

    // Report errors.
    if (!flushed || !closed) {
        if (flushed) {
            // If not flushed, we want the flush error to fall through.
            q->setError(QFile::UnspecifiedError, qt_error_string(errno));
        }
        return false;
    }

    return true;
}

void SubjectMenu::setSubjectLocation(SubjectMenu::SubjectType subjectType, int id, int location)
{
    QSqlQuery query;

    if(subjectType == User) {
        query.prepare("UPDATE Users set locationId=:locationid where userId=:subjectid");
    }
    else {
        query.prepare("UPDATE Robot set locationId=:locationid where robotId=:subjectid");
    }

    query.bindValue(":subjectid",id);
    query.bindValue(":locationid",location);

    if (!query.exec()) {
        qCritical("Cannot update: %s (%s)",
                  DbSvc::getFactory()->getDb()->lastError().text().toLatin1().data(),
                  qt_error_string().toLocal8Bit().data());
    }
}

/*!
    \internal
*/
bool QFSFileEnginePrivate::flushFh()
{
    Q_Q(QFSFileEngine);

    // Never try to flush again if the last flush failed. Otherwise you can
    // get crashes on some systems (AIX).
    if (lastFlushFailed)
        return false;

    int ret = fflush(fh);

    lastFlushFailed = (ret != 0);
    lastIOCommand = QFSFileEnginePrivate::IOFlushCommand;

    if (ret != 0) {
        q->setError(errno == ENOSPC ? QFile::ResourceError : QFile::WriteError,
                    qt_error_string(errno));
        return false;
    }
    return true;
}

QBluetoothSocketPrivate::QBluetoothSocketPrivate()
    : socket(-1),
      socketType(QBluetoothServiceInfo::UnknownProtocol),
      state(QBluetoothSocket::UnconnectedState),
      socketError(QBluetoothSocket::NoSocketError),
      readNotifier(0),
      connectWriteNotifier(0),
      connecting(false),
      discoveryAgent(0),
      isServerSocket(false)
{
#ifdef QT_QNX_BT_BLUETOOTH
    if (!initCounter && (bt_spp_init() == -1))
        qCDebug(QT_BT_QNX) << "Could not initialize Bluetooth library. "
                           << qt_error_string(errno);

    initCounter++;
#else
    ppsRegisterControl();
#endif
}

void QBluetoothSocketPrivate::_q_readNotify()
{
    Q_Q(QBluetoothSocket);
    char *writePointer = buffer.reserve(QPRIVATELINEARBUFFER_BUFFERSIZE);
    int readFromDevice = ::read(socket, writePointer, QPRIVATELINEARBUFFER_BUFFERSIZE);
    if (readFromDevice <= 0){
        int errsv = errno;
        readNotifier->setEnabled(false);
        connectWriteNotifier->setEnabled(false);
        qCWarning(QT_BT_QNX) << Q_FUNC_INFO << socket << " error:" << readFromDevice << errorString; //TODO Try if this actually works
        errorString = qt_error_string(errsv);
        q->setSocketError(QBluetoothSocket::UnknownSocketError);

        q->disconnectFromService();
        q->setSocketState(QBluetoothSocket::UnconnectedState);
    } else {
        buffer.chop(QPRIVATELINEARBUFFER_BUFFERSIZE - (readFromDevice < 0 ? 0 : readFromDevice));

        emit q->readyRead();
    }
}

/*!
    \internal
*/
qint64 QFSFileEnginePrivate::readLineFdFh(char *data, qint64 maxlen)
{
    Q_Q(QFSFileEngine);
    if (!fh)
        return q->QAbstractFileEngine::readLine(data, maxlen);

    const QT_OFF_T oldPos = QT_FTELL(fh);

    // QIODevice::readLine() passes maxlen - 1 to QFile::readLineData()
    // because it has made space for the '\0' at the end of data.  But fgets
    // does the same, so we'd get two '\0' at the end - passing maxlen + 1
    // solves this.
    if (!fgets(data, int(maxlen + 1), fh)) {
        if (!feof(fh))
            q->setError(QFile::ReadError, qt_error_string(int(errno)));
        return -1;              // error
    }

    const qint64 lineLength = QT_FTELL(fh) - oldPos;
    return lineLength > 0 ? lineLength : qstrlen(data);
}

/*
  This opens the specified library, mmaps it into memory, and searches
  for the QT_PLUGIN_VERIFICATION_DATA.  The advantage of this approach is that
  we can get the verification data without have to actually load the library.
  This lets us detect mismatches more safely.

  Returns false if version information is not present, or if the
                information could not be read.
  Returns  true if version information is present and successfully read.
*/
static bool qt_unix_query(const QString &library, uint *version, bool *debug, QLibraryPrivate *lib = 0)
{
    QFile file(library);
    if (!file.open(QIODevice::ReadOnly)) {
        if (lib)
            lib->errorString = file.errorString();
        if (qt_debug_component()) {
            qWarning("%s: %s", QFile::encodeName(library).data(),
                qPrintable(qt_error_string(errno)));
        }
        return false;
    }

    QByteArray data;
    const char *filedata = 0;
    ulong fdlen = file.size();
    filedata = (char *) file.map(0, fdlen);
    if (filedata == 0) {
        // try reading the data into memory instead
        data = file.readAll();
        filedata = data.constData();
        fdlen = data.size();
    }

    /*
       ELF binaries on GNU, have .qplugin sections.
    */
    const char pattern[] = "pattern=QT_PLUGIN_VERIFICATION_DATA";
    const ulong plen = qstrlen(pattern);
    const long pos = qt_find_pattern(filedata, fdlen, pattern, plen);
    bool ret = false;
    if (pos >= 0)
        ret = qt_parse_pattern(filedata + pos, version, debug);

    if (!ret && lib)
        lib->errorString = QLibrary::tr("Plugin verification data mismatch in '%1'").arg(library);
    file.close();
    return ret;
}

/*!
    Opens the file descriptor \a fd to the file engine, using the open mode \a
    flags.
*/
bool QFSFileEnginePrivate::openFd(QIODevice::OpenMode openMode, int fd)
{
    Q_Q(QFSFileEngine);
    this->fd = fd;
    fh = 0;

    // Seek to the end when in Append mode.
    if (openMode & QFile::Append) {
        int ret;
        do {
            ret = QT_LSEEK(fd, 0, SEEK_END);
        } while (ret == -1 && errno == EINTR);

        if (ret == -1) {
            q->setError(errno == EMFILE ? QFile::ResourceError : QFile::OpenError,
                        qt_error_string(int(errno)));
            return false;
        }
    }

    return true;
}

/*
    \internal
*/
qint64 QFSFileEnginePrivate::nativeWrite(const char *data, qint64 len)
{
    Q_Q(QFSFileEngine);

    if (fh || fd != -1) {
        // stdio / stdlib mode.
        return writeFdFh(data, len);
    }

    // Windows native mode.
    if (fileHandle == INVALID_HANDLE_VALUE)
        return -1;

    qint64 bytesToWrite = len;

    // Writing on Windows fails with ERROR_NO_SYSTEM_RESOURCES when
    // the chunks are too large, so we limit the block size to 32MB.
    const DWORD blockSize = DWORD(qMin(bytesToWrite, qint64(32 * 1024 * 1024)));
    qint64 totalWritten = 0;
    do {
        DWORD bytesWritten;
        if (!WriteFile(fileHandle, data + totalWritten, blockSize, &bytesWritten, NULL)) {
            if (totalWritten == 0) {
                // Note: Only return error if the first WriteFile failed.
                q->setError(QFile::WriteError, qt_error_string());
                return -1;
            }
            break;
        }
        if (bytesWritten == 0)
            break;
        totalWritten += bytesWritten;
        bytesToWrite -= bytesWritten;
    } while (totalWritten < len);
    return qint64(totalWritten);
}

void QBluetoothSocketPrivate::_q_readNotify()
{
    Q_Q(QBluetoothSocket);
    char *writePointer = buffer.reserve(QPRIVATELINEARBUFFER_BUFFERSIZE);
//    qint64 readFromDevice = q->readData(writePointer, QPRIVATELINEARBUFFER_BUFFERSIZE);
    int readFromDevice = ::read(socket, writePointer, QPRIVATELINEARBUFFER_BUFFERSIZE);
    buffer.chop(QPRIVATELINEARBUFFER_BUFFERSIZE - (readFromDevice < 0 ? 0 : readFromDevice));
    if(readFromDevice <= 0){
        int errsv = errno;
        readNotifier->setEnabled(false);
        connectWriteNotifier->setEnabled(false);
        errorString = qt_error_string(errsv);
        qCWarning(QT_BT_BLUEZ) << Q_FUNC_INFO << socket << "error:" << readFromDevice << errorString;
        if(errsv == EHOSTDOWN)
            q->setSocketError(QBluetoothSocket::HostNotFoundError);
        else
            q->setSocketError(QBluetoothSocket::UnknownSocketError);

        q->disconnectFromService();
    }
    else {
        emit q->readyRead();
    }
}

/*!
    Begins execution of the thread by calling run(), which should be
    reimplemented in a QThread subclass to contain your code. The
    operating system will schedule the thread according to the \a
    priority parameter. If the thread is already running, this
    function does nothing.

    \sa run(), terminate()
*/
void QThread::start(Priority priority)
{
    Q_D(QThread);
    QMutexLocker locker(&d->mutex);
    if (d->running)
        return;

    d->running = true;
    d->finished = false;
    d->terminated = false;

    pthread_attr_t attr;
    pthread_attr_init(&attr);
    pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);

    d->priority = priority;

#if defined(Q_OS_DARWIN) || !defined(Q_OS_OPENBSD) && defined(_POSIX_THREAD_PRIORITY_SCHEDULING) && (_POSIX_THREAD_PRIORITY_SCHEDULING-0 >= 0)
    switch (priority) {
    case InheritPriority:
        {
            pthread_attr_setinheritsched(&attr, PTHREAD_INHERIT_SCHED);
            break;
        }

    default:
        {
            int sched_policy;
            if (pthread_attr_getschedpolicy(&attr, &sched_policy) != 0) {
                // failed to get the scheduling policy, don't bother
                // setting the priority
                qWarning("QThread::start: Cannot determine default scheduler policy");
                break;
            }

            int prio_min = sched_get_priority_min(sched_policy);
            int prio_max = sched_get_priority_max(sched_policy);
            if (prio_min == -1 || prio_max == -1) {
                // failed to get the scheduling parameters, don't
                // bother setting the priority
                qWarning("QThread::start: Cannot determine scheduler priority range");
                break;
            }

            int prio;
            switch (priority) {
            case IdlePriority:
                prio = prio_min;
                break;

            case TimeCriticalPriority:
                prio = prio_max;
                break;

            default:
                // crudely scale our priority enum values to the prio_min/prio_max
                prio = (((prio_max - prio_min) / TimeCriticalPriority) * priority) + prio_min;
                prio = qMax(prio_min, qMin(prio_max, prio));
                break;
            }

            sched_param sp;
            sp.sched_priority = prio;

            if (pthread_attr_setinheritsched(&attr, PTHREAD_EXPLICIT_SCHED) != 0
                || pthread_attr_setschedpolicy(&attr, sched_policy) != 0
                || pthread_attr_setschedparam(&attr, &sp) != 0) {
                // could not set scheduling hints, fallback to inheriting them
                pthread_attr_setinheritsched(&attr, PTHREAD_INHERIT_SCHED);
            }
            break;
        }
    }
#endif // _POSIX_THREAD_PRIORITY_SCHEDULING

    if (d->stackSize > 0) {
#if defined(_POSIX_THREAD_ATTR_STACKSIZE) && (_POSIX_THREAD_ATTR_STACKSIZE-0 > 0)
        int code = pthread_attr_setstacksize(&attr, d->stackSize);
#else
        int code = ENOSYS; // stack size not supported, automatically fail
#endif // _POSIX_THREAD_ATTR_STACKSIZE

        if (code) {
            qWarning("QThread::start: Thread stack size error: %s",
                     qPrintable(qt_error_string(code)));

            // we failed to set the stacksize, and as the documentation states,
            // the thread will fail to run...
            d->running = false;
            d->finished = false;
            return;
//.........这里部分代码省略.........

void tst_QMimeDatabase::initTestCase()
{
    QVERIFY2(m_temporaryDir.isValid(), qPrintable(m_temporaryDir.errorString()));
    QStandardPaths::setTestModeEnabled(true);
    m_localMimeDir = QStandardPaths::writableLocation(QStandardPaths::GenericDataLocation) + "/mime";
    if (QDir(m_localMimeDir).exists()) {
        QVERIFY2(QDir(m_localMimeDir).removeRecursively(), qPrintable(m_localMimeDir + ": " + qt_error_string()));
    }
    QString errorMessage;

#ifdef USE_XDG_DATA_DIRS
    // Create a temporary "global" XDG data dir for later use
    // It will initially contain a copy of freedesktop.org.xml
    QVERIFY2(m_temporaryDir.isValid(),
             ("Could not create temporary subdir: " + m_temporaryDir.errorString()).toUtf8());
    const QDir here = QDir(m_temporaryDir.path());
    m_globalXdgDir = m_temporaryDir.path() + QStringLiteral("/global");
    const QString globalPackageDir = m_globalXdgDir + QStringLiteral("/mime/packages");
    QVERIFY(here.mkpath(globalPackageDir));

    qputenv("XDG_DATA_DIRS", QFile::encodeName(m_globalXdgDir));
    qDebug() << "\nGlobal XDG_DATA_DIRS: " << m_globalXdgDir;

    const QString freeDesktopXml = QStringLiteral("freedesktop.org.xml");
    const QString xmlFileName = QLatin1String(RESOURCE_PREFIX) + freeDesktopXml;
    const QString xmlTargetFileName = globalPackageDir + QLatin1Char('/') + freeDesktopXml;
    QVERIFY2(copyResourceFile(xmlFileName, xmlTargetFileName, &errorMessage), qPrintable(errorMessage));
#endif

    m_testSuite = QFINDTESTDATA("testfiles");
    if (m_testSuite.isEmpty())
        qWarning("%s", qPrintable(testSuiteWarning()));

    errorMessage = QString::fromLatin1("Cannot find '%1'");
    for (uint i = 0; i < sizeof additionalMimeFiles / sizeof additionalMimeFiles[0] - 1; i++) {
        const QString resourceFilePath = QString::fromLatin1(RESOURCE_PREFIX) + QLatin1String(additionalMimeFiles[i]);
        QVERIFY2(QFile::exists(resourceFilePath), qPrintable(errorMessage.arg(resourceFilePath)));
        m_additionalMimeFileNames.append(QLatin1String(additionalMimeFiles[i]));
        m_additionalMimeFilePaths.append(resourceFilePath);
    }

    initTestCaseInternal();
    m_isUsingCacheProvider = !qEnvironmentVariableIsSet("QT_NO_MIME_CACHE");
}

/*!
    \internal
*/
qint64 QFSFileEnginePrivate::nativeRead(char *data, qint64 len)
{
    Q_Q(QFSFileEngine);

#ifdef Q_OS_SYMBIAN
    if (symbianFile.SubSessionHandle()) {
        if(len > KMaxTInt) {
            //this check is more likely to catch a corrupt length, since it isn't possible to allocate 2GB buffers (yet..)
            q->setError(QFile::ReadError, QLatin1String("Maximum 2GB in single read on this platform"));
            return -1;
        }
        TPtr8 ptr(reinterpret_cast<TUint8*>(data), static_cast<TInt>(len));
        TInt r = symbianFile.Read(symbianFilePos, ptr);
        if (r != KErrNone)
        {
            q->setError(QFile::ReadError, QSystemError(r, QSystemError::NativeError).toString());
            return -1;
        }
        symbianFilePos += ptr.Length();
        return qint64(ptr.Length());
    }
#endif
    if (fh && nativeIsSequential()) {
        size_t readBytes = 0;
        int oldFlags = fcntl(QT_FILENO(fh), F_GETFL);
        for (int i = 0; i < 2; ++i) {
            // Unix: Make the underlying file descriptor non-blocking
            if ((oldFlags & O_NONBLOCK) == 0)
                fcntl(QT_FILENO(fh), F_SETFL, oldFlags | O_NONBLOCK);

            // Cross platform stdlib read
            size_t read = 0;
            do {
                read = fread(data + readBytes, 1, size_t(len - readBytes), fh);
            } while (read == 0 && !feof(fh) && errno == EINTR);
            if (read > 0) {
                readBytes += read;
                break;
            } else {
                if (readBytes)
                    break;
                readBytes = read;
            }

            // Unix: Restore the blocking state of the underlying socket
            if ((oldFlags & O_NONBLOCK) == 0) {
                fcntl(QT_FILENO(fh), F_SETFL, oldFlags);
                if (readBytes == 0) {
                    int readByte = 0;
                    do {
                        readByte = fgetc(fh);
                    } while (readByte == -1 && errno == EINTR);
                    if (readByte != -1) {
                        *data = uchar(readByte);
                        readBytes += 1;
                    } else {
                        break;
                    }
                }
            }
        }
        // Unix: Restore the blocking state of the underlying socket
        if ((oldFlags & O_NONBLOCK) == 0) {
            fcntl(QT_FILENO(fh), F_SETFL, oldFlags);
        }
        if (readBytes == 0 && !feof(fh)) {
            // if we didn't read anything and we're not at EOF, it must be an error
            q->setError(QFile::ReadError, qt_error_string(int(errno)));
            return -1;
        }
        return readBytes;
    }

    return readFdFh(data, len);
}

// TODO: This looks like should be ported to C code. or a big part of it.
bool DivelogsDeWebServices::prepare_dives_for_divelogs(const QString &tempfile, const bool selected)
{
	static const char errPrefix[] = "divelog.de-upload:";
	if (!amount_selected) {
		report_error(tr("no dives were selected").toUtf8());
		return false;
	}

	xsltStylesheetPtr xslt = NULL;
	struct zip *zip;

	xslt = get_stylesheet("divelogs-export.xslt");
	if (!xslt) {
		qDebug() << errPrefix << "missing stylesheet";
		return false;
	}


	int error_code;
	zip = zip_open(QFile::encodeName(tempfile), ZIP_CREATE, &error_code);
	if (!zip) {
		char buffer[1024];
		zip_error_to_str(buffer, sizeof buffer, error_code, errno);
		report_error(tr("failed to create zip file for upload: %s").toUtf8(), buffer);
		return false;
	}

	/* walk the dive list in chronological order */
	int i;
	struct dive *dive;
	for_each_dive (i, dive) {
		FILE *f;
		char filename[PATH_MAX];
		int streamsize;
		char *membuf;
		xmlDoc *transformed;
		struct zip_source *s;

		/*
		 * Get the i'th dive in XML format so we can process it.
		 * We need to save to a file before we can reload it back into memory...
		 */
		if (selected && !dive->selected)
			continue;
		f = tmpfile();
		if (!f) {
			report_error(tr("cannot create temporary file: %s").toUtf8(), qt_error_string().toUtf8().data());
			goto error_close_zip;
		}
		save_dive(f, dive);
		fseek(f, 0, SEEK_END);
		streamsize = ftell(f);
		rewind(f);

		membuf = (char *)malloc(streamsize + 1);
		if (!membuf || (streamsize = fread(membuf, 1, streamsize, f)) == 0) {
			report_error(tr("internal error: %s").toUtf8(), qt_error_string().toUtf8().data());
			fclose(f);
			free((void *)membuf);
			goto error_close_zip;
		}
		membuf[streamsize] = 0;
		fclose(f);

		/*
		 * Parse the memory buffer into XML document and
		 * transform it to divelogs.de format, finally dumping
		 * the XML into a character buffer.
		 */
		xmlDoc *doc = xmlReadMemory(membuf, streamsize, "divelog", NULL, 0);
		if (!doc) {
			qWarning() << errPrefix << "could not parse back into memory the XML file we've just created!";
			report_error(tr("internal error").toUtf8());
			free((void *)membuf);
			goto error_close_zip;
		}
		free((void *)membuf);

		transformed = xsltApplyStylesheet(xslt, doc, NULL);
		xmlDocDumpMemory(transformed, (xmlChar **)&membuf, &streamsize);
		xmlFreeDoc(doc);
		xmlFreeDoc(transformed);

		/*
		 * Save the XML document into a zip file.
		 */
		snprintf(filename, PATH_MAX, "%d.xml", i + 1);
		s = zip_source_buffer(zip, membuf, streamsize, 1);
		if (s) {
			int64_t ret = zip_add(zip, filename, s);
			if (ret == -1)
				qDebug() << errPrefix << "failed to include dive:" << i;
		}
	}

QString QStandardPaths::writableLocation(StandardLocation type)
{
    switch (type) {
    case HomeLocation:
        return QDir::homePath();
    case TempLocation:
        return QDir::tempPath();
    case CacheLocation:
    case GenericCacheLocation:
    {
        // http://standards.freedesktop.org/basedir-spec/basedir-spec-0.6.html
        QString xdgCacheHome = QFile::decodeName(qgetenv("XDG_CACHE_HOME"));
        if (isTestModeEnabled())
            xdgCacheHome = QDir::homePath() + QLatin1String("/.qttest/cache");
        if (xdgCacheHome.isEmpty())
            xdgCacheHome = QDir::homePath() + QLatin1String("/.cache");
        if (type == QStandardPaths::CacheLocation)
            appendOrganizationAndApp(xdgCacheHome);
        return xdgCacheHome;
    }
    case DataLocation:
    case GenericDataLocation:
    {
        QString xdgDataHome = QFile::decodeName(qgetenv("XDG_DATA_HOME"));
        if (isTestModeEnabled())
            xdgDataHome = QDir::homePath() + QLatin1String("/.qttest/share");
        if (xdgDataHome.isEmpty())
            xdgDataHome = QDir::homePath() + QLatin1String("/.local/share");
        if (type == QStandardPaths::DataLocation)
            appendOrganizationAndApp(xdgDataHome);
        return xdgDataHome;
    }
    case ConfigLocation:
    {
        // http://standards.freedesktop.org/basedir-spec/latest/
        QString xdgConfigHome = QFile::decodeName(qgetenv("XDG_CONFIG_HOME"));
        if (isTestModeEnabled())
            xdgConfigHome = QDir::homePath() + QLatin1String("/.qttest/config");
        if (xdgConfigHome.isEmpty())
            xdgConfigHome = QDir::homePath() + QLatin1String("/.config");
        return xdgConfigHome;
    }
    case RuntimeLocation:
    {
        const uid_t myUid = geteuid();
        // http://standards.freedesktop.org/basedir-spec/latest/
        QString xdgRuntimeDir = QFile::decodeName(qgetenv("XDG_RUNTIME_DIR"));
        if (xdgRuntimeDir.isEmpty()) {
            const QString userName = QFileSystemEngine::resolveUserName(myUid);
            xdgRuntimeDir = QDir::tempPath() + QLatin1String("/runtime-") + userName;
            QDir dir(xdgRuntimeDir);
            if (!dir.exists()) {
                if (!QDir().mkdir(xdgRuntimeDir)) {
                    qWarning("QStandardPaths: error creating runtime directory %s: %s", qPrintable(xdgRuntimeDir), qPrintable(qt_error_string(errno)));
                    return QString();
                }
            }
            qWarning("QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '%s'", qPrintable(xdgRuntimeDir));
        }
        // "The directory MUST be owned by the user"
        QFileInfo fileInfo(xdgRuntimeDir);
        if (fileInfo.ownerId() != myUid) {
            qWarning("QStandardPaths: wrong ownership on runtime directory %s, %d instead of %d", qPrintable(xdgRuntimeDir),
                     fileInfo.ownerId(), myUid);
            return QString();
        }
        // "and he MUST be the only one having read and write access to it. Its Unix access mode MUST be 0700."
        QFile file(xdgRuntimeDir);
        const QFile::Permissions wantedPerms = QFile::ReadUser | QFile::WriteUser | QFile::ExeUser;
        if (file.permissions() != wantedPerms && !file.setPermissions(wantedPerms)) {
            qWarning("QStandardPaths: wrong permissions on runtime directory %s", qPrintable(xdgRuntimeDir));
            return QString();
        }
        return xdgRuntimeDir;
    }
    default:
        break;
    }

#ifndef QT_BOOTSTRAPPED
    // http://www.freedesktop.org/wiki/Software/xdg-user-dirs
    QString xdgConfigHome = QFile::decodeName(qgetenv("XDG_CONFIG_HOME"));
    if (xdgConfigHome.isEmpty())
        xdgConfigHome = QDir::homePath() + QLatin1String("/.config");
    QFile file(xdgConfigHome + QLatin1String("/user-dirs.dirs"));
    if (!isTestModeEnabled() && file.open(QIODevice::ReadOnly)) {
        QHash<QString, QString> lines;
        QTextStream stream(&file);
        // Only look for lines like: XDG_DESKTOP_DIR="$HOME/Desktop"
        QRegExp exp(QLatin1String("^XDG_(.*)_DIR=(.*)$"));
        while (!stream.atEnd()) {
            const QString &line = stream.readLine();
            if (exp.indexIn(line) != -1) {
                const QStringList lst = exp.capturedTexts();
                const QString key = lst.at(1);
                QString value = lst.at(2);
                if (value.length() > 2
                    && value.startsWith(QLatin1Char('\"'))
                    && value.endsWith(QLatin1Char('\"')))
                    value = value.mid(1, value.length() - 2);
//.........这里部分代码省略.........