Uploaded image for project: 'Qt'
  1. Qt
  2. QTBUG-87151

QSerialPort: synchronous read fails as waitForReadyRead() always times out.

    XMLWordPrintable

Details

    • Windows
    • 4ff9993d9f2e991f2da1885a694d4f3a61c9af73 01e0371f9d (qt/tqtc-qtserialport/5.15) f3a306a30f (qt/qtserialport/dev) f3a306a30f (qt/tqtc-qtserialport/dev) b71e60fbed (qt/tqtc-qtserialport/6.2) 6d5b4b3d71 (qt/qtserialport/6.3)

    Description

      In synchronous Read this code doesn't work. waitForReadyRead always return false, "buff" will be empty always.

       

      while (m_serialPort->waitForReadyRead(TOUT_MS))
{
    buff.append(m_serialPort->readAll());
}

       

      Instead async Read work properly. Signal ReadyRead generated properly.

      In 5.12.9 , 5.6 all work correctly.

      Attachments

        1. asyn_ok.cpp
          0.7 kB
          noksel J
        2. async_ok.jpg
          306 kB
          noksel J
        3. sync1_fail.cpp
          0.7 kB
          noksel J
        4. sync1_fail.jpg
          312 kB
          noksel J
        5. sync2_ok.cpp
          0.8 kB
          noksel J
        6. sync2_ok.jpg
          308 kB
          noksel J

        Issue Links

          is duplicated by

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-103822 QSerialPort::waitForReadyRead always returns false on older Windows systems

          • P3: Somewhat important - Should be fixed, but doesn't affect the release in any way.
          • Closed
          is required for

          Task - A task that needs to be done. QTBUG-93865 Fix regressions in QtSerialPort after porting to alertable I/O functions on Windows

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Closed
          For Gerrit Dashboard: QTBUG-87151
          # Subject Branch Project Status CR V
          415578,2 Windows: fix soft memory leak in synchronous mode tqtc/lts-5.15 qt/tqtc-qtserialport Status: MERGED +2 0
          415817,3 Windows: fix soft memory leak in synchronous mode dev qt/qtserialport Status: MERGED +2 0
          415840,2 Windows: fix soft memory leak in synchronous mode 6.4 qt/qtserialport Status: MERGED +2 0
          415841,2 Windows: fix soft memory leak in synchronous mode 6.3 qt/qtserialport Status: MERGED +2 0
          415843,2 Windows: fix soft memory leak in synchronous mode tqtc/lts-6.2 qt/tqtc-qtserialport Status: MERGED +2 0

          Activity

            People

              Unassigned Unassigned
              noksel noksel J
              Votes:
              2 Vote for this issue
              Watchers:
              3 Start watching this issue

              Dates

                Created:
                Updated:
                Resolved:

                Gerrit Reviews

                  There are no open Gerrit changes