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Rework the "failed to find or load QPA plugin" message a bit 

This is one of the most frequent problems users ask for help with, and they
don't even know if the plugin was found but not loaded or simply not found.

Qt knows what happened, so communicate it to the user.

Change-Id: I6003ed4ab3d147a5d159b2002004e53c251cb512
Reviewed-by: Jake Petroules <jake.petroules@qt.io>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
Reviewed-by: David Faure <david.faure@kdab.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
bb10
Sergio Martins 2017-12-13 23:23:42 +00:00 committed by Sérgio Martins
parent b4330bc391
commit 60d99b6413
1 changed files with 8 additions and 2 deletions
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10
src/gui/kernel/qguiapplication.cpp
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@ -1140,8 +1140,14 @@ static void init_platform(const QString &pluginArgument, const QString &platform
if (Q_UNLIKELY(!QGuiApplicationPrivate::platform_integration)) {
QStringList keys = QPlatformIntegrationFactory::keys(platformPluginPath);
QString fatalMessage
= QStringLiteral("This application failed to start because it could not find or load the Qt platform plugin \"%1\"\nin \"%2\".\n\n").arg(name, QDir::toNativeSeparators(platformPluginPath));
QString fatalMessage;
if (keys.contains(name)) {
fatalMessage = QStringLiteral("This application failed to start because it could not load the Qt platform plugin \"%2\"\nin \"%3\", even though it was found. ").arg(name, QDir::toNativeSeparators(platformPluginPath));
fatalMessage += QStringLiteral("This is usually due to missing dependencies, which you can verify by setting the env variable QT_DEBUG_PLUGINS to 1.\n\n");
} else {
fatalMessage = QStringLiteral("This application failed to start because it could not find the Qt platform plugin \"%2\"\nin \"%3\".\n\n").arg(name, QDir::toNativeSeparators(platformPluginPath));
}
if (!keys.isEmpty()) {
fatalMessage += QStringLiteral("Available platform plugins are: %1.\n\n").arg(
keys.join(QLatin1String(", ")));