struct ISystemUserCallback {
};

ISystem.h

User defined callback, which can be passed to ISystem.

virtual ~ISystemUserCallback();

virtual void GetMemoryUsage(ICrySizer* pSizer) = 0;

Collects the memory information in the user program/application.

Signals to User that engine error occurred.

virtual bool OnError(const char * szErrorString) = 0;

True to Halt execution or false to ignore this error

virtual void OnInit(ISystem *);

Initialization callback. This is called early in CSystem::Init(), before any of the other callback methods is called.

CSystem::Init()

virtual void OnInitProgress(const char * sProgressMsg) = 0;

Notifies user, usually editor, about initialization progress in system.

virtual void OnProcessSwitch() = 0;

Notifies user that system wants to switch out of current process.

Called when pressing ESC in game mode to go to Menu.

Quit callback.

virtual void OnQuit();

CSystem::Quit()

Shutdown callback.

virtual void OnShutdown();

virtual void OnSystemConnect(ISystem * pSystem);

This method is called at the earliest point the ISystem pointer can be used the log might not be yet there.

virtual void OnUpdate();

Notify user of an update iteration. Called in the update loop.

virtual int ShowMessage(const char* text, const char* caption, unsigned int uType);

Show message by provider.