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juce_ApplicationBase.cpp
1/*
2 ==============================================================================
3
4 This file is part of the JUCE library.
5 Copyright (c) 2017 - ROLI Ltd.
6
7 JUCE is an open source library subject to commercial or open-source
8 licensing.
9
10 The code included in this file is provided under the terms of the ISC license
11 http://www.isc.org/downloads/software-support-policy/isc-license. Permission
12 To use, copy, modify, and/or distribute this software for any purpose with or
13 without fee is hereby granted provided that the above copyright notice and
14 this permission notice appear in all copies.
15
16 JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
17 EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
18 DISCLAIMED.
19
20 ==============================================================================
21*/
22
23 namespace juce
24{
25
26JUCEApplicationBase::CreateInstanceFunction JUCEApplicationBase::createInstance = nullptr;
27JUCEApplicationBase* JUCEApplicationBase::appInstance = nullptr;
28
29#if JUCE_IOS
30 void* JUCEApplicationBase::iOSCustomDelegate = nullptr;
31#endif
32
33JUCEApplicationBase::JUCEApplicationBase()
34{
35 jassert (isStandaloneApp() && appInstance == nullptr);
36 appInstance = this;
37}
38
39 JUCEApplicationBase::~JUCEApplicationBase()
40{
41 jassert (appInstance == this);
42 appInstance = nullptr;
43}
44
45 void JUCEApplicationBase::setApplicationReturnValue (const int newReturnValue) noexcept
46{
47 appReturnValue = newReturnValue;
48}
49
50// This is called on the Mac and iOS where the OS doesn't allow the stack to unwind on shutdown..
51 void JUCEApplicationBase::appWillTerminateByForce()
52{
53 JUCE_AUTORELEASEPOOL
54 {
55 {
56 const std::unique_ptr<JUCEApplicationBase> app (appInstance);
57
58 if (app != nullptr)
59 app->shutdownApp();
60 }
61
62 DeletedAtShutdown::deleteAll();
63 MessageManager::deleteInstance();
64 }
65}
66
67 void JUCEApplicationBase::quit()
68{
69 MessageManager::getInstance()->stopDispatchLoop();
70}
71
72 void JUCEApplicationBase::sendUnhandledException (const std::exception* const e,
73 const char* const sourceFile,
74 const int lineNumber)
75{
76 if (auto* app = JUCEApplicationBase::getInstance())
77 {
78 // If you hit this assertion then the __FILE__ macro is providing a
79 // relative path instead of an absolute path. On Windows this will be
80 // a path relative to the build directory rather than the currently
81 // running application. To fix this you must compile with the /FC flag.
82 jassert (File::isAbsolutePath (sourceFile));
83
84 app->unhandledException (e, sourceFile, lineNumber);
85 }
86}
87
88//==============================================================================
89#if ! (JUCE_IOS || JUCE_ANDROID)
90 #define JUCE_HANDLE_MULTIPLE_INSTANCES 1
91#endif
92
93#if JUCE_HANDLE_MULTIPLE_INSTANCES
94 struct JUCEApplicationBase::MultipleInstanceHandler : public ActionListener
95{
96 MultipleInstanceHandler (const String& appName)
97 : appLock ("juceAppLock_" + appName)
98 {
99 }
100
101 bool sendCommandLineToPreexistingInstance()
102 {
103 if (appLock.enter (0))
104 return false;
105
106 if (auto* app = JUCEApplicationBase::getInstance())
107 {
108 MessageManager::broadcastMessage (app->getApplicationName() + "/" + app->getCommandLineParameters());
109 return true;
110 }
111
112 jassertfalse;
113 return false;
114 }
115
116 void actionListenerCallback (const String& message) override
117 {
118 if (auto* app = JUCEApplicationBase::getInstance())
119 {
120 auto appName = app->getApplicationName();
121
122 if (message.startsWith (appName + "/"))
123 app->anotherInstanceStarted (message.substring (appName.length() + 1));
124 }
125 }
126
127 private:
128 InterProcessLock appLock;
129
130 JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (MultipleInstanceHandler)
131};
132
133 bool JUCEApplicationBase::sendCommandLineToPreexistingInstance()
134{
135 jassert (multipleInstanceHandler == nullptr); // this must only be called once!
136
137 multipleInstanceHandler.reset (new MultipleInstanceHandler (getApplicationName()));
138 return multipleInstanceHandler->sendCommandLineToPreexistingInstance();
139}
140
141#else
142 struct JUCEApplicationBase::MultipleInstanceHandler {};
143#endif
144
145//==============================================================================
146#if JUCE_ANDROID
147
148StringArray JUCEApplicationBase::getCommandLineParameterArray() { return {}; }
149String JUCEApplicationBase::getCommandLineParameters() { return {}; }
150
151#else
152
153#if JUCE_WINDOWS && ! defined (_CONSOLE)
154
155String JUCE_CALLTYPE JUCEApplicationBase::getCommandLineParameters()
156{
157 return CharacterFunctions::findEndOfToken (CharPointer_UTF16 (GetCommandLineW()),
158 CharPointer_UTF16 (L" "),
159 CharPointer_UTF16 (L"\"")).findEndOfWhitespace();
160}
161
162StringArray JUCE_CALLTYPE JUCEApplicationBase::getCommandLineParameterArray()
163{
164 StringArray s;
165 int argc = 0;
166
167 if (auto argv = CommandLineToArgvW (GetCommandLineW(), &argc))
168 {
169 s = StringArray (argv + 1, argc - 1);
170 LocalFree (argv);
171 }
172
173 return s;
174}
175
176#else
177
178#if JUCE_IOS
179 extern int juce_iOSMain (int argc, const char* argv[], void* classPtr);
180#endif
181
182#if JUCE_MAC
183 extern void initialiseNSApplication();
184#endif
185
186#if JUCE_LINUX && JUCE_MODULE_AVAILABLE_juce_gui_extra && (! defined(JUCE_WEB_BROWSER) || JUCE_WEB_BROWSER)
187 extern int juce_gtkWebkitMain (int argc, const char* argv[]);
188#endif
189
190#if JUCE_WINDOWS
191 const char* const* juce_argv = nullptr;
192 int juce_argc = 0;
193#else
194 extern const char* const* juce_argv; // declared in juce_core
195 extern int juce_argc;
196#endif
197
198 String JUCEApplicationBase::getCommandLineParameters()
199{
200 String argString;
201
202 for (int i = 1; i < juce_argc; ++i)
203 {
204 String arg (juce_argv[i]);
205
206 if (arg.containsChar (' ') && ! arg.isQuotedString())
207 arg = arg.quoted ('"');
208
209 argString << arg << ' ';
210 }
211
212 return argString.trim();
213}
214
215 StringArray JUCEApplicationBase::getCommandLineParameterArray()
216{
217 return StringArray (juce_argv + 1, juce_argc - 1);
218}
219
220 int JUCEApplicationBase::main (int argc, const char* argv[])
221{
222 JUCE_AUTORELEASEPOOL
223 {
224 juce_argc = argc;
225 juce_argv = argv;
226
227 #if JUCE_MAC
228 initialiseNSApplication();
229 #endif
230
231 #if JUCE_LINUX && JUCE_MODULE_AVAILABLE_juce_gui_extra && (! defined(JUCE_WEB_BROWSER) || JUCE_WEB_BROWSER)
232 if (argc >= 2 && String (argv[1]) == "--juce-gtkwebkitfork-child")
233 return juce_gtkWebkitMain (argc, argv);
234 #endif
235
236 #if JUCE_IOS
237 return juce_iOSMain (argc, argv, iOSCustomDelegate);
238 #else
239
240 return JUCEApplicationBase::main();
241 #endif
242 }
243}
244
245#endif
246
247//==============================================================================
248 int JUCEApplicationBase::main()
249{
250 ScopedJuceInitialiser_GUI libraryInitialiser;
251 jassert (createInstance != nullptr);
252
253 const std::unique_ptr<JUCEApplicationBase> app (createInstance());
254 jassert (app != nullptr);
255
256 if (! app->initialiseApp())
257 return app->shutdownApp();
258
259 JUCE_TRY
260 {
261 // loop until a quit message is received..
262 MessageManager::getInstance()->runDispatchLoop();
263 }
264 JUCE_CATCH_EXCEPTION
265
266 return app->shutdownApp();
267}
268
269#endif
270
271//==============================================================================
272 bool JUCEApplicationBase::initialiseApp()
273{
274 #if JUCE_HANDLE_MULTIPLE_INSTANCES
275 if ((! moreThanOneInstanceAllowed()) && sendCommandLineToPreexistingInstance())
276 {
277 DBG ("Another instance is running - quitting...");
278 return false;
279 }
280 #endif
281
282 #if JUCE_WINDOWS && JUCE_STANDALONE_APPLICATION && (! defined (_CONSOLE)) && (! JUCE_MINGW)
283 if (AttachConsole (ATTACH_PARENT_PROCESS) != 0)
284 {
285 // if we've launched a GUI app from cmd.exe or PowerShell, we need this to enable printf etc.
286 // However, only reassign stdout, stderr, stdin if they have not been already opened by
287 // a redirect or similar.
288 FILE* ignore;
289
290 if (_fileno(stdout) < 0) freopen_s (&ignore, "CONOUT$", "w", stdout);
291 if (_fileno(stderr) < 0) freopen_s (&ignore, "CONOUT$", "w", stderr);
292 if (_fileno(stdin) < 0) freopen_s (&ignore, "CONIN$", "r", stdin);
293 }
294 #endif
295
296 // let the app do its setting-up..
297 initialise (getCommandLineParameters());
298
299 stillInitialising = false;
300
301 if (MessageManager::getInstance()->hasStopMessageBeenSent())
302 return false;
303
304 #if JUCE_HANDLE_MULTIPLE_INSTANCES
305 if (auto* mih = multipleInstanceHandler.get())
306 MessageManager::getInstance()->registerBroadcastListener (mih);
307 #endif
308
309 return true;
310}
311
312 int JUCEApplicationBase::shutdownApp()
313{
314 jassert (JUCEApplicationBase::getInstance() == this);
315
316 #if JUCE_HANDLE_MULTIPLE_INSTANCES
317 if (auto* mih = multipleInstanceHandler.get())
318 MessageManager::getInstance()->deregisterBroadcastListener (mih);
319 #endif
320
321 JUCE_TRY
322 {
323 // give the app a chance to clean up..
324 shutdown();
325 }
326 JUCE_CATCH_EXCEPTION
327
328 multipleInstanceHandler.reset();
329 return getApplicationReturnValue();
330}
331
332} // namespace juce
juce::CharacterFunctions::findEndOfToken
static Type findEndOfToken(Type text, BreakType breakCharacters, Type quoteCharacters)
Definition: juce_CharacterFunctions.h:768
juce::DeletedAtShutdown::deleteAll
static void deleteAll()
Definition: juce_DeletedAtShutdown.cpp:53
juce::File::isAbsolutePath
static bool isAbsolutePath(StringRef path)
Definition: juce_File.cpp:402
juce::JUCEApplicationBase::~JUCEApplicationBase
virtual ~JUCEApplicationBase()
Definition: juce_ApplicationBase.cpp:39
juce::JUCEApplicationBase::initialise
virtual void initialise(const String &commandLineParameters)=0
juce::JUCEApplicationBase::getApplicationName
virtual const String getApplicationName()=0
juce::JUCEApplicationBase::getCommandLineParameters
static String JUCE_CALLTYPE getCommandLineParameters()
Definition: juce_ApplicationBase.cpp:198
juce::JUCEApplicationBase::quit
static void quit()
Definition: juce_ApplicationBase.cpp:67
juce::JUCEApplicationBase::getCommandLineParameterArray
static StringArray JUCE_CALLTYPE getCommandLineParameterArray()
Definition: juce_ApplicationBase.cpp:215
juce::JUCEApplicationBase::setApplicationReturnValue
void setApplicationReturnValue(int newReturnValue) noexcept
Definition: juce_ApplicationBase.cpp:45
juce::JUCEApplicationBase::getInstance
static JUCEApplicationBase * getInstance() noexcept
Definition: juce_ApplicationBase.h:96
juce::JUCEApplicationBase::isStandaloneApp
static bool isStandaloneApp() noexcept
Definition: juce_ApplicationBase.h:267
juce::JUCEApplicationBase::moreThanOneInstanceAllowed
virtual bool moreThanOneInstanceAllowed()=0
juce::JUCEApplicationBase::getApplicationReturnValue
int getApplicationReturnValue() const noexcept
Definition: juce_ApplicationBase.h:262
juce::MessageManager::broadcastMessage
static void broadcastMessage(const String &messageText)
juce::MessageManager::runDispatchLoop
void runDispatchLoop()
Definition: juce_MessageManager.cpp:120
juce::MessageManager::stopDispatchLoop
void stopDispatchLoop()
Definition: juce_MessageManager.cpp:135
juce::MessageManager::deregisterBroadcastListener
void deregisterBroadcastListener(ActionListener *listener)
Definition: juce_MessageManager.cpp:214
juce::MessageManager::registerBroadcastListener
void registerBroadcastListener(ActionListener *listener)
Definition: juce_MessageManager.cpp:206
juce::MessageManager::deleteInstance
static void deleteInstance()
Definition: juce_MessageManager.cpp:61
juce::MessageManager::getInstance
static MessageManager * getInstance()
Definition: juce_MessageManager.cpp:45
juce::StringArray
Definition: juce_StringArray.h:35
juce::String
Definition: juce_String.h:39
juce::String::trim
String trim() const
Definition: juce_String.cpp:1667
juce::String::isQuotedString
bool isQuotedString() const
Definition: juce_String.cpp:1621
juce::String::containsChar
bool containsChar(juce_wchar character) const noexcept
Definition: juce_String.cpp:1051
juce::String::quoted
String quoted(juce_wchar quoteCharacter='"') const
Definition: juce_String.cpp:1635