浏览器看外国网站,网站用哪种语言,建设个人博客网站,哪家企业做网站这里以Qt Creator 4.15.2版本的源码为示例进行分析
源码结构如下#xff0c;为了追溯其插件加载过程#xff0c;从main.cpp入手 Qt Creator的插件目录#xff0c;生成的插件#xff0c;好几十个呢 Qt Creator插件的读取
int main(int argc, char **argv)中以下代码创建插…这里以Qt Creator 4.15.2版本的源码为示例进行分析
源码结构如下为了追溯其插件加载过程从main.cpp入手 Qt Creator的插件目录生成的插件好几十个呢 Qt Creator插件的读取
int main(int argc, char **argv)中以下代码创建插件的管理 PluginManager pluginManager;PluginManager::setPluginIID(QLatin1String(org.qt-project.Qt.QtCreatorPlugin));PluginManager::setGlobalSettings(globalSettings);PluginManager::setSettings(settings); int main(int argc, char **argv)中以下设置插件的读取目录读取所有插件信息 const QStringList pluginPaths getPluginPaths() options.customPluginPaths;PluginManager::setPluginPaths(pluginPaths);//读取插件目录下的插件
从 PluginManager::setPluginPaths(pluginPaths)调用追溯到如下
void PluginManagerPrivate::setPluginPaths(const QStringList paths)
{qCDebug(pluginLog) Plugin search paths: paths;qCDebug(pluginLog) Required IID: pluginIID;pluginPaths paths;readSettings();readPluginPaths();
}
继续追溯void PluginManagerPrivate::readPluginPaths() for (const QString pluginFile : pluginFiles(pluginPaths)) {PluginSpec *spec PluginSpec::read(pluginFile);
PluginSpec *PluginSpec::read(const QString filePath)
{auto spec new PluginSpec;if (!spec-d-read(filePath)) { // not a Qt Creator plugindelete spec;return nullptr;}return spec;
}
其中bool PluginSpecPrivate::read(const QString fileName)方法读取了插件的基本信息 Qt Creator 加载插件
从main函数中的 PluginManager::loadPlugins();开始追溯插件的加载
void PluginManagerPrivate::loadPlugins()
{//所有插件都会从loaded--initialized--runningconst QVectorPluginSpec * queue loadQueue();Utils::setMimeStartupPhase(MimeStartupPhase::PluginsLoading);for (PluginSpec *spec : queue)loadPlugin(spec, PluginSpec::Loaded);Utils::setMimeStartupPhase(MimeStartupPhase::PluginsInitializing);for (PluginSpec *spec : queue)loadPlugin(spec, PluginSpec::Initialized);Utils::setMimeStartupPhase(MimeStartupPhase::PluginsDelayedInitializing);Utils::reverseForeach(queue, [this](PluginSpec *spec) {loadPlugin(spec, PluginSpec::Running);//从这里开始加载插件...step2if (spec-state() PluginSpec::Running) {delayedInitializeQueue.push(spec);} else {// Plugin initialization failed, so cleanup after itspec-d-kill();}});...
}
插件加载的几个主要步骤load, initialize, run
在 void PluginManagerPrivate::loadPlugin(PluginSpec *spec, PluginSpec::State destState)中 switch (destState) {case PluginSpec::Loaded:profilingReport(loadLibrary, spec);spec-d-loadLibrary();profilingReport(loadLibrary, spec);break;case PluginSpec::Initialized:profilingReport(initializePlugin, spec);spec-d-initializePlugin();profilingReport(initializePlugin, spec);break;case PluginSpec::Stopped:profilingReport(stop, spec);if (spec-d-stop() IPlugin::AsynchronousShutdown) {asynchronousPlugins spec;connect(spec-plugin(), IPlugin::asynchronousShutdownFinished,this, PluginManagerPrivate::asyncShutdownFinished);}profilingReport(stop, spec);break;default:break;}
继续追溯bool PluginSpecPrivate::loadLibrary() if (!loader.load()) {//这里是加载插件hasError true;errorString QDir::toNativeSeparators(filePath) QString::fromLatin1(: ) loader.errorString();return false;} Qt Creator插件
合格的插件需要继承自IPlugin抽象类
以CppEditorPlugin为例
class CppEditorPlugin : public ExtensionSystem::IPlugin
看一下IPlugin类 #pragma once#include extensionsystem_global.h#include QObjectnamespace ExtensionSystem {namespace Internal {class IPluginPrivate;class PluginSpecPrivate;
}class PluginManager;
class PluginSpec;class EXTENSIONSYSTEM_EXPORT IPlugin : public QObject
{Q_OBJECTpublic:enum ShutdownFlag {SynchronousShutdown,AsynchronousShutdown};IPlugin();~IPlugin() override;virtual bool initialize(const QStringList arguments, QString *errorString) 0;virtual void extensionsInitialized() {}virtual bool delayedInitialize() { return false; }virtual ShutdownFlag aboutToShutdown() { return SynchronousShutdown; }virtual QObject *remoteCommand(const QStringList /* options */,const QString /* workingDirectory */,const QStringList /* arguments */) { return nullptr; }virtual QVectorQObject * createTestObjects() const;PluginSpec *pluginSpec() const;signals:void asynchronousShutdownFinished();private:Internal::IPluginPrivate *d;friend class Internal::PluginSpecPrivate;
};} // namespace ExtensionSystem实现具体的插件类时以下方法是必须重写的
virtual bool initialize(const QStringList arguments, QString *errorString) 0;
