Convert enum in QProcess to string

[medvedm]

I'm writing some code which responds to the error() signal in QProcess. What I'd like to do is easily output the value of the QProcess::ProcessError that gets passed in... I was going to take a generic approach when I dug through the code and found that they don't use Q_ENUMS inside of QProcess which would have made the enum values easily QString-able. See:

https://qt.gitorious.org/qt/qtbase/source/d52b00e1d3cc60c81b54a89d6da488dc4bbce384:src/corelib/io/qprocess.h

As opposed to enums in the Qt namespace, which are Q_ENUMed:

https://qt.gitorious.org/qt/qtbase/source/d52b00e1d3cc60c81b54a89d6da488dc4bbce384:src/corelib/global/qnamespace.h

Is there any "rule" for Qt developers like, if you have a class that uses enumerated values publicly, you should tell moc about them with Q_ENUMS so that people can write really friendly error handlers.

Should I submit this as a bug/feature request? Is there some means of getting at this thing that I don't know about? It is my understanding that one must use Q_ENUMS if you are going to try and use QMetaEnum.

[MuldeR]

You could do something like:
@#define ENUM_TO_STR(X,Y) do
{
if((X) == (Y) return QString::fromLatin1( #Y );
}
while(0)

QString error2str(const int &error)
{
ENUM_TO_STR(error, QProcess::FailedToStart);
ENUM_TO_STR(error, QProcess::Crashed);
ENUM_TO_STR(error, QProcess::Timedot);
ENUM_TO_STR(error, QProcess::ReadError);
ENUM_TO_STR(error, QProcess::WriteError);
ENUM_TO_STR(error, QProcess::UnknownError);
}@

[medvedm]

Yeah, I was trying to avoid writing any kind of specific case function - given Qt has a generic way of getting information about enums, it would be awesome if people registered their enums.

[Xander84]

what about QIODevice::errorString() ?
QIODevice is the base class of QProcess and there is an example that uses errorString() with a QProcess object, so you might just give it a try. :)

see here: http://qt-project.org/doc/qt-5/qprocess.html#setProcessChannelMode
@
QProcess builder;
builder.setProcessChannelMode(QProcess::MergedChannels);
builder.start("make", QStringList() << "-j2");

if (!builder.waitForFinished())
qDebug() << "Make failed:" << builder.errorString();
else
qDebug() << "Make output:" << builder.readAll();
@