I added a comment to the issue: http://bugreports.qt.nokia.com/browse/QTBUG-15178?focusedCommentId=132078&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_132078 ................... Although "expect" is a tcl-based tool, there's also applications built on "libexpect" which aren't TCL based. The example I gave in http://lists.trolltech.com/pipermail/qt-qml/2010-November/001566.html was for http://nielsmayer.com/winterp/ 's expect-based subprocess facility. In that environment, expect based subprocesses get launched, and callbacks for read or write activity on the file-descriptors are setup "behind the scenes." This allows for easy integration of subprocesses into event-driven UI frameworks – activity in the subprocess just becomes another event. (In use for media capture/conversion in a 1995-era web-based multimedia editor: http://nielsmayer.com/wwweasel/node15.html http://nielsmayer.com/wwweasel/node12.html ) Treating subprocesses in a similarly abstract way in QtQuick/QML could allow them to be handled in a "declarative" fashion with code that invokes http://doc.qt.nokia.com/4.7/qsocketnotifier.html "under the hood."
I've attached the C code implementing the subprocess functionality. There's some useful, oddball state-machine code in there that could be used elsewhere, once you get past the Xt/Motif API usage, as well as the XLISP API usage (the C code implements the lisp primitives). For example, a demo application that runs the unix "bc" infinite precision calculator, and keeps it busy computing sequential squares of the previous number to the power two; the UI remains responsive because the computations are all happening in the subprocess, and returning back to the UI as events: http://nielsmayer.com/winterp/scrnsnaps/inf-square.gif http://nielsmayer.com/winterp/examples/inf-square.lsp .................... Now that I've read the responses and more documentation, seems like a good first approach would be to attempt to add "primitives" to QML that are implemented in C, using technique described in http://doc.trolltech.com/4.7-snapshot/qtbinding.html#calling-c-methods-from-qml ; http://doc.trolltech.com/4.7/qprocess.html handles subprocesses already so it's just a small matter of programming from there.... :-) Many of the C/C++ primitives needed are discussed here in the links below, but QML-equivalents are not readily found for all these examples and http://doc.qt.nokia.com/qtmobility-1.1-tp/qdeclarativeexamples.html 404's.... http://doc.qt.nokia.com/qtmobility-1.1-tp/ http://doc.qt.nokia.com/qtmobility-1.1-tp/camera.html http://doc.qt.nokia.com/qtmobility-1.1-tp/contacts.html http://doc.qt.nokia.com/qtmobility-1.1-tp/gallery.html http://doc.qt.nokia.com/qtmobility-1.1-tp/feedback.html http://doc.qt.nokia.com/qtmobility-1.1-tp/location-overview.html http://doc.qt.nokia.com/qtmobility-1.1-tp/messaging.html http://doc.qt.nokia.com/qtmobility-1.1-tp/multimedia.html http://doc.qt.nokia.com/qtmobility-1.1-tp/organizer.html http://doc.qt.nokia.com/qtmobility-1.1-tp/publ-subs.html http://doc.qt.nokia.com/qtmobility-1.1-tp/service-frameworks.html http://doc.qt.nokia.com/qtmobility-1.1-tp/sensors-api.html http://doc.qt.nokia.com/qtmobility-1.1-tp/systeminfo.html http://doc.qt.nokia.com/qtmobility-1.1-tp/telephony.html http://doc.qt.nokia.com/qtmobility-1.1-tp/versit.html Some QML specific refs found in above docs: http://doc.qt.nokia.com/qtmobility-1.1-tp/qml-soundeffect.html QML SoundEffect Element http://doc.qt.nokia.com/qtmobility-1.1-tp/qml-audio.html QML Audio Element http://doc.qt.nokia.com/qtmobility-1.1-tp/qml-video.html QML Video Element http://doc.qt.nokia.com/qtmobility-1.1-tp/battery-charge.html Accessing Publish and Subscribe from QML Niels http://nielsmayer.com _______________________________________________ Qt-qml mailing list Qt-qml@trolltech.com http://lists.trolltech.com/mailman/listinfo/qt-qml
