6bfc18d016
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@54465 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
107 lines
3.4 KiB
Objective-C
107 lines
3.4 KiB
Objective-C
/////////////////////////////////////////////////////////////////////////////
|
|
// Name: snglinst.h
|
|
// Purpose: interface of wxSingleInstanceChecker
|
|
// Author: wxWidgets team
|
|
// RCS-ID: $Id$
|
|
// Licence: wxWindows license
|
|
/////////////////////////////////////////////////////////////////////////////
|
|
|
|
/**
|
|
@class wxSingleInstanceChecker
|
|
|
|
wxSingleInstanceChecker class allows to check that only a single instance of a
|
|
program is running. To do it, you should create an object of this class. As
|
|
long as this object is alive, calls to
|
|
wxSingleInstanceChecker::IsAnotherRunning from
|
|
other processes will return @true.
|
|
|
|
As the object should have the life span as big as possible, it makes sense to
|
|
create it either as a global or in wxApp::OnInit. For
|
|
example:
|
|
|
|
@code
|
|
bool MyApp::OnInit()
|
|
{
|
|
const wxString name = wxString::Format("MyApp-%s", wxGetUserId().c_str());
|
|
m_checker = new wxSingleInstanceChecker(name);
|
|
if ( m_checker-IsAnotherRunning() )
|
|
{
|
|
wxLogError(_("Another program instance is already running, aborting."));
|
|
|
|
delete m_checker; // OnExit() won't be called if we return false
|
|
m_checker = NULL;
|
|
|
|
return false;
|
|
}
|
|
|
|
... more initializations ...
|
|
|
|
return true;
|
|
}
|
|
|
|
int MyApp::OnExit()
|
|
{
|
|
delete m_checker;
|
|
|
|
return 0;
|
|
}
|
|
@endcode
|
|
|
|
Note using wxGetUserId() to construct the name: this
|
|
allows different user to run the application concurrently which is usually the
|
|
intended goal. If you don't use the user name in the wxSingleInstanceChecker
|
|
name, only one user would be able to run the application at a time.
|
|
|
|
This class is implemented for Win32 and Unix platforms (supporting @c fcntl()
|
|
system call, but almost all of modern Unix systems do) only.
|
|
|
|
@library{wxbase}
|
|
@category{misc}
|
|
*/
|
|
class wxSingleInstanceChecker
|
|
{
|
|
public:
|
|
/**
|
|
Like Create() but without
|
|
error checking.
|
|
*/
|
|
wxSingleInstanceChecker(const wxString& name,
|
|
const wxString& path = wxEmptyString);
|
|
|
|
/**
|
|
Destructor frees the associated resources.
|
|
Note that it is not virtual, this class is not meant to be used polymorphically
|
|
*/
|
|
~wxSingleInstanceChecker();
|
|
|
|
/**
|
|
Initialize the object if it had been created using the default constructor.
|
|
Note that you can't call Create() more than once, so calling it if the
|
|
@ref wxsingleinstancechecker() "non default ctor"
|
|
had been used is an error.
|
|
|
|
@param name
|
|
must be given and be as unique as possible. It is used as the
|
|
mutex name under Win32 and the lock file name under Unix.
|
|
GetAppName() and wxGetUserId()
|
|
are commonly used to construct this parameter.
|
|
@param path
|
|
is optional and is ignored under Win32 and used as the directory to
|
|
create the lock file in under Unix (default is
|
|
wxGetHomeDir())
|
|
|
|
@return Returns @false if initialization failed, it doesn't mean that
|
|
another instance is running - use IsAnotherRunning()
|
|
to check for it.
|
|
*/
|
|
bool Create(const wxString& name,
|
|
const wxString& path = wxEmptyString);
|
|
|
|
/**
|
|
Returns @true if another copy of this program is already running, @false
|
|
otherwise.
|
|
*/
|
|
bool IsAnotherRunning() const;
|
|
};
|
|
|