[Interest] Qt debugging techniques?

[Richard Moore]

A few useful things:

You can set the QT_FLUSH_PAINT environment variable to see which parts of
your widgets are getting repainted.

You can set the QT_DEBUG_PLUGINS environment variable to see what's
happening when Qt loads plugins (E.g. image formats)

You can view all the requests passing through QNetworkAccessManager as
detailed here
http://blogs.kde.org/2010/05/01/qnetworkaccessmanager-proxy-classes

You can get the details of what Qt sees when connecting to an SSL server as
detailed here http://blogs.kde.org/2011/01/09/getting-details-ssl-connection

You can make your SSL traffic decryptable by wireshark as detailed here
http://peter.hartmann.tk/blog/2013/04/decrypt-ssl-traffic-of-qt-programs-in-wireshark.html

Also many of Qt's subsystems have defines that can be enabled at build time
to dump information about what they're doing as debug messages.

Cheers

Rich.
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