diff options
Diffstat (limited to 'src/corelib/global/qlogging.cpp')
-rw-r--r-- | src/corelib/global/qlogging.cpp | 30 |
1 files changed, 25 insertions, 5 deletions
diff --git a/src/corelib/global/qlogging.cpp b/src/corelib/global/qlogging.cpp index 5a7f8242de..c1dd04f03c 100644 --- a/src/corelib/global/qlogging.cpp +++ b/src/corelib/global/qlogging.cpp @@ -1669,14 +1669,34 @@ static bool android_default_message_handler(QtMsgType type, #endif //Q_OS_ANDROID #ifdef Q_OS_WIN +static void win_outputDebugString_helper(QStringView message) +{ + const int maxOutputStringLength = 32766; + static QBasicMutex m; + auto locker = qt_unique_lock(m); + // fast path: Avoid string copies if one output is enough + if (message.length() <= maxOutputStringLength) { + OutputDebugString(reinterpret_cast<const wchar_t *>(message.utf16())); + } else { + wchar_t *messagePart = new wchar_t[maxOutputStringLength + 1]; + for (int i = 0; i < message.length(); i += maxOutputStringLength ) { + const int length = std::min(message.length() - i, maxOutputStringLength ); + const int len = message.mid(i, length).toWCharArray(messagePart); + Q_ASSERT(len == length); + messagePart[len] = 0; + OutputDebugString(messagePart); + } + delete[] messagePart; + } +} + static bool win_message_handler(QtMsgType type, const QMessageLogContext &context, const QString &message) { if (shouldLogToStderr()) return false; // Leave logging up to stderr handler - QString formattedMessage = qFormatLogMessage(type, context, message); - formattedMessage.append(QLatin1Char('\n')); - OutputDebugString(reinterpret_cast<const wchar_t *>(formattedMessage.utf16())); + const QString formattedMessage = qFormatLogMessage(type, context, message).append('\n'); + win_outputDebugString_helper(formattedMessage); return true; // Prevent further output to stderr } @@ -1832,11 +1852,11 @@ static void qt_message_print(QtMsgType msgType, const QMessageLogContext &contex static void qt_message_print(const QString &message) { #if defined(Q_OS_WINRT) - OutputDebugString(reinterpret_cast<const wchar_t*>(message.utf16())); + win_outputDebugString_helper(message); return; #elif defined(Q_OS_WIN) && !defined(QT_BOOTSTRAPPED) if (!shouldLogToStderr()) { - OutputDebugString(reinterpret_cast<const wchar_t*>(message.utf16())); + win_outputDebugString_helper(message); return; } #endif |