[QtSerialPort] Simple example crashes
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Hi M4chin3.
Here at a forum already there was the same problem, but I can't find a this thread. It is strange. Solutions of this problem, certainly still aren't present because the reason is unclear.
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Whether your OS has serial ports? Give please a screenshot from Device Manager (with numbers and names of ports).
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Can you reproduce a problem without this code?
@// Example use QSerialPort
QSerialPort serial;
serial.setPort(info);
if (serial.open(QIODevice::ReadWrite))
serial.close();
}@- Can you reproduce a problem with Release branch?
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Hi,
right now i'm at home. I'll test your recommendations tomorrow.
Just for the information: I've set up a virtual machine here at home with Qt and QtSerialPort and it works. Same installation process, so this should be fine.I will answer to your questions tomorrow.
Thanks in advance!
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For me, this problem doesn't repeat, I can't reproduce it. Probably, you incorrectly compiled library.
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I got the same error. I followed this tutorial:
http://gracianotorrao.com/2013/05/07/how-to-build-the-qserialport-module-using-qt5-windows-7/ -
Please try build and install through QtCreator.
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because this "bug" only for Windows!
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I got the problem!
On my linux environment (arch Linux x86_64) it works perfectly (I compiled using qt creator).On my windows 7 I was having some troubles to make it works. I was getting the same dll issues that you're having and I solved, that's what I did:
I reinstalled QT with all the addons (full-installation).
Removed the Perl that I was using (strawberry Perl)
Installed Active Perl (the last version)
Compiled the qtserialport module following this tutorial:
http://gracianotorrao.com/2013/05/07/how-to-build-the-qserialport-module-using-qt5-windows-7/The only exception was that I got the source by cloning the git repository.
By now it compiles!
Probably it will work to you too.
Good luck ^^ -
kuzulis:
Hi,
- I'm trying to use USB-to-Comport devices with a FTDI IC (FT232R). Here's a picture of my device mger:
"Device manager screen (imgshack)":http://imageshack.us/a/img29/4827/mzma.png
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I can reproduce the same error without the lines of code you mentioned. I forgot about this: The error occurs in the head of the foreach loop within the static method "availablePorts()" of class QSerialPortInfo.
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I can reproduce the same error with the release branch version of QtSerialPort.
[quote author="kuzulis" date="1371481349"]Hi M4chin3.
Here at a forum already there was the same problem, but I can't find a this thread. It is strange. Solutions of this problem, certainly still aren't present because the reason is unclear.
-
Whether your OS has serial ports? Give please a screenshot from Device Manager (with numbers and names of ports).
-
Can you reproduce a problem without this code?
@// Example use QSerialPort
QSerialPort serial;
serial.setPort(info);
if (serial.open(QIODevice::ReadWrite))
serial.close();
}@- Can you reproduce a problem with Release branch?
https://qt.gitorious.org/qt/qtserialport/commits/release[/quote]
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quickybr:
I also got strawberry perl, so i tried your way with Active Perl on the WinXp machine.
-> The QtSerialPort lib was compiled fine (same like with strawberry perl). I also could use it in Qt Creator but it didn't find any of my serial ports. I will check about this in detail tomorrow.Why WinXP machine and not the Win7 one iam actually working with?
-> i dont have admin on the win7 machine. I have to wait for the IT guys untill tomorrow.
:-/ -
bq. Removed the Perl that I was using (strawberry Perl)
Installed Active Perl (the last version)Hmm.. It is interesting, thx! May it is a cause of problem? Because I'm using Active perl and don't have a problem.
Can anyone try to check with this difference of Perl?
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Hi everybody,
finally i got ActivePerl installed on the Win7 machine. Sadly it didn't change anything for me :-(. I compiled and installed QtSerialPort both ways: via console and via QtCreator and tested it.
The programm still crashes in the same behaviour as described before.
This is the crash track in detail:
main (QSerialPortInfo::availablePorts()) -> qserialportinfo_win.cpp;line 166 (QString s = devicePortName(deviceInfoSet, &deviceInfoData);) -> qserialportinfo_win.cpp;line 132 (QByteArray data(dataSize, 0);)The construction of the QByteArray fails somehow and this creates the Qt5Core.dll error. The question is why?
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Hi,
okay i' one step further:
WinXP 32bit:
Status:
Couldn't find any serial ports but did not crash like Win7 Pro 64bit. QtSerialPort compiled with Strawberry Perl or ActivePerl didn't matter.Problem:
Administrator priviliges are needed otherwise "::SetupDiEnumDeviceInfo(deviceInfoSet, index++, &deviceInfoData)" returns true but the &deviceInfoData is emtpy respectivly the device name is empty (QString s = devicePortName(deviceInfoSet, &deviceInfoData))I'll try to get administrator priviliges tomorrow to try this on Windows7. At least i know how the serial ports are searched on windows systems.
Will this be changed? Otherwise users of my programm will also need administrator priviliges right? Wouldn't be that good.
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bq. The question is why?
I don't know. For a solution I need to reproduce at itself crash - but I can't.
bq. Otherwise users of my programm will also need administrator priviliges right?
No. Privileges of the administrator aren't required. Most likely you have any other restrictions on your user account.
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Hello everyone,
in the last weeks i had no time for further investigation about the error. Today i opened the example project again, ran it and it works! I Didn't change anything in the code and my priviliges on this machine are the same than i posted the last time.
I assume that in the time i didn't touch the project the IT department did a windows update via their updatemanagement that fixed my problem. I'll contact them for a list of updates they did in this time. I hope i get a list from them. Maybe i find a patch that could be related to my error.
I don't have any other explanation for this.
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Similar issue.
Using QtSerialPort built from current 'stable' branch (50ab4d) causes simple example (from wiki) to crash in first QSerialPort::open() with segmentation fault (application terminates with exit code 255). Using QtSerialPort built from current 'release' branch (84df6e) works ok.
My setup is:
Win7 Pro x64
Qt 4.8.4 -
Bisecting between revisions I got following results:
- da0c6b works ok
- 43f7c6 seems works ok but adds messages to debug output: "virtual void QSerialPort::close(): device not open"
- 50ab4d causes crash (as described in previous post)
(Tests was performed by reusing full rebuild cycle: <module build dir> mingw32-make clean, <module build dir> mingw32-make uninstall, clean <module build dir>, clean <app project>, run qmake on <app project>, ...)
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Hi.
Yes, I confirm it. Thx.
