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1 // This project demonstrates how to migrate a Windows desktop app to Native | |
2 // Client, running first as a Win32 application (define STEP1), then as a PPAPI | |
3 // plugin (define STEP2 through STEP6), and finally as a Native Client module. | |
4 | |
5 // Start with STEP1 defined and the defines for STEP2 through STEP6 commented | |
6 // out. For each step in the process, un-comment the next #define, leaving the | |
7 // previous ones on. Ready, set, port! | |
8 | |
9 // *** SELECT THE WIN32 PLATFORM AND RUN WITH #define STEP1 ONLY *** | |
10 | |
11 #define STEP1 | |
12 // Launches the original Windows desktop application, Hello World, which runs | |
13 // as WinMain. STEP1 encloses Windows-specific functions that are used with | |
14 // the WIN32 and PPAPI platforms. These will be removed when the full PPAPI | |
15 // port is finished (STEP6) | |
16 | |
17 // *** SELECT THE PPAPI PLATFORM *** | |
18 | |
19 #define STEP2 | |
20 | |
21 // Client Module. STEP2 encloses the Native Client module APIs needed to link | |
22 // any app to the browser. The module does nothing except report | |
23 // starting/ending the function Instance_DidCreate. The Windows app does not | |
24 // run because it is not being called. | |
25 | |
26 #define STEP3 | |
27 // What changed: Replace WinMain with WndProc, and call it from | |
28 // Instance_DidCreate, launching hello_nacl_plus in its own window. Since | |
29 // WndProc spins in its message loop, the call to Instance_DidCreate never | |
30 // returns. Close the hello_nacl_plus window and the module initialization will | |
31 // finish. | |
32 | |
33 #define STEP4 | |
34 // What changed: In WndProc replace the message loop with a callback function. | |
35 // Now the app window and the Native Client module are running concurrently. | |
36 | |
37 #define STEP5 | |
38 // What changed: Instance_DidCreate calls initInstanceInBrowserWindow rather | |
39 // than initInstanceInPCWindow. The initInstanceInBrowserWindow uses | |
40 // postMessage to place text (now "Hello, Native Client") in the web page | |
41 // instead of opening and writing to a window. | |
42 | |
43 #define STEP6 | |
44 // What changed: All the Windows code is def'd out, to prove we are | |
45 // PPAPI-compliant. The functional code that is running is the same as STEP5. | |
46 | |
47 // *** SELECT THE NACL64 PLATFORM AND RUN *** | |
48 | |
49 // What changed: The code is the same as STEP6, but you are using the SDK | |
50 // toolchain to compile it into a nexe. The module is now running as a real | |
51 // Native Client executable in a NaCl sandbox, with nacl-gdb attached. | |
52 | |
53 // *** RUN YOUR MODULE IN THE WILD *** | |
54 // You can run your nexe outside of Visual Studio, directly from Chrome by | |
55 // following these steps: | |
56 // - Build STEP6 and verify the file | |
57 // <project directory>/newlib/hello_nacl_plus/hello_nacl_plus.nexe exists | |
58 // - Copy the folder <project directory>/hello_nacl_plus into your NaCl SDK's | |
59 // example directory. | |
60 // - Go to the NaCl SDK directory and launch the httpd.py server. | |
61 // - Launch Chrome, go to about:flags and enable the Native Client flag and | |
62 // relaunch Chrome | |
63 // - Point Chrome at localhost:5103/hello_nacl_plus | |
64 | |
65 #ifdef STEP6 | |
66 // remove Windows-dependent code. | |
67 #undef STEP1 | |
68 #undef STEP3 | |
69 #undef STEP4 | |
70 #define NULL 0 | |
71 #else | |
72 // includes for Windows APIs. | |
73 #include <windows.h> | |
74 #include <stdlib.h> | |
75 #include <tchar.h> | |
76 #endif | |
77 | |
78 #ifdef STEP2 | |
79 // includes for PPAPI C++ | |
80 #include "ppapi/cpp/instance.h" | |
81 #include "ppapi/cpp/module.h" | |
82 #include "ppapi/cpp/var.h" | |
83 #include "ppapi/cpp/core.h" | |
84 #include "ppapi/cpp/completion_callback.h" | |
85 #include "ppapi/utility/completion_callback_factory.h" | |
86 | |
87 // This is a known PPAPI platform problem (Issue 81375). | |
88 // When WinUser.h is included it defines PostMessage, so we undef it here. | |
89 // There is a work-around: | |
90 #ifdef PostMessage | |
91 #undef PostMessage | |
92 #endif | |
93 | |
94 class NaClProjectInstance *myInstance; | |
95 int initInstanceInPCWindow(); | |
96 void initInstanceInBrowserWindow(); | |
97 | |
98 #endif | |
99 | |
100 #ifdef STEP2 | |
101 | |
102 // **** Native Client Framework **** | |
103 | |
104 // The Instance class. | |
105 class NaClProjectInstance : public pp::Instance { | |
106 public: | |
107 pp::CompletionCallbackFactory<NaClProjectInstance> factory_; | |
108 | |
109 explicit NaClProjectInstance(PP_Instance instance) | |
110 : pp::Instance(instance), | |
111 // Use this macro to eliminate compiler warning. | |
112 PP_ALLOW_THIS_IN_INITIALIZER_LIST(factory_(this)) { | |
113 myInstance = this; | |
114 } | |
115 | |
116 | |
117 virtual ~NaClProjectInstance() { | |
118 } | |
119 | |
120 virtual bool Init(uint32_t /*argc*/, const char* /*argn*/[], | |
121 const char* /*argv*/[]) { | |
122 PostMessage(pp::Var("Creating Instance Start")); | |
123 #ifdef STEP5 | |
124 // Will be included in STEP5 and STEP6 | |
125 // Uses messaging to relay text to the module's view on the web page | |
126 initInstanceInBrowserWindow(); | |
127 #else | |
128 #ifdef STEP3 | |
129 // Will be included in STEP3 and STEP4 only | |
130 // Uses WndProc to place text in a window separate from the browser. | |
131 initInstanceInPCWindow(); | |
132 #endif | |
133 #endif | |
134 PostMessage(pp::Var("Creating Instance End")); | |
135 return true; | |
136 } | |
137 | |
138 #ifdef STEP4 | |
139 // Implements Windows window message loop with a callback function. | |
140 void NaClProjectInstance::SendCallback(int result) { | |
141 pp::Core* core = pp::Module::Get()->core(); | |
142 CompletionCallback callback = factory_.NewCallback(&HandleWindowMsg); | |
143 core->CallOnMainThread(100, callbacl, result); | |
144 } | |
145 | |
146 void HandleWindowMsg(int32_t result) { | |
147 MSG uMsg; | |
148 if (PeekMessage(&uMsg, NULL, 0, 0, PM_REMOVE)) { | |
149 TranslateMessage(&uMsg); | |
150 DispatchMessage(&uMsg); | |
151 } | |
152 SendCallback(0); | |
153 } | |
154 | |
155 #endif | |
156 private: | |
157 virtual void HandleMessage(const pp::Var& var_message) { | |
158 } | |
159 }; | |
160 | |
161 // The Module class. | |
162 class NaClProjectModule : public pp::Module { | |
163 public: | |
164 NaClProjectModule() : pp::Module() {} | |
165 virtual ~NaClProjectModule() {} | |
166 | |
167 virtual pp::Instance* CreateInstance(PP_Instance instance) { | |
168 return new NaClProjectInstance(instance); | |
169 } | |
170 }; | |
171 | |
172 namespace pp { | |
173 Module* CreateModule() { | |
174 return new NaClProjectModule(); | |
175 } | |
176 } | |
177 | |
178 #endif | |
179 | |
180 // **** Application Code **** | |
181 | |
182 #ifdef STEP1 | |
183 // Desktop Windows Hello World app. Native Client agnostic. | |
184 | |
185 static TCHAR szWindowClass[] = _T("win32app"); | |
186 static TCHAR szTitle[] = _T("hello_nacl_plus"); | |
187 HINSTANCE hInst; | |
188 LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM); | |
189 | |
190 // WinMain | |
191 int WINAPI WinMain(HINSTANCE hInstance, | |
192 HINSTANCE hPrevInstance, | |
193 LPSTR lpCmdLine, | |
194 int nCmdShow) | |
195 { | |
196 WNDCLASSEX wcex; | |
197 | |
198 wcex.cbSize = sizeof(WNDCLASSEX); | |
199 wcex.style = CS_HREDRAW | CS_VREDRAW; | |
200 wcex.lpfnWndProc = WndProc; | |
201 wcex.cbClsExtra = 0; | |
202 wcex.cbWndExtra = 0; | |
203 wcex.hInstance = hInstance; | |
204 wcex.hIcon = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_APPLICATION)); | |
205 wcex.hCursor = LoadCursor(NULL, IDC_ARROW); | |
206 wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW+1); | |
207 wcex.lpszMenuName = NULL; | |
208 wcex.lpszClassName = szWindowClass; | |
209 wcex.hIconSm = LoadIcon(wcex.hInstance, | |
210 MAKEINTRESOURCE(IDI_APPLICATION)); | |
211 | |
212 if (!RegisterClassEx(&wcex)) { | |
213 MessageBox(NULL, | |
214 _T("Call to RegisterClassEx failed!"), | |
215 _T("hello_nacl_plus"), | |
216 NULL); | |
217 | |
218 return 1; | |
219 } | |
220 | |
221 hInst = hInstance; | |
222 | |
223 HWND hWnd = CreateWindow( | |
224 szWindowClass, | |
225 szTitle, | |
226 WS_OVERLAPPEDWINDOW, | |
227 CW_USEDEFAULT, CW_USEDEFAULT, | |
228 500, 100, | |
229 NULL, | |
230 NULL, | |
231 hInstance, | |
232 NULL); | |
233 | |
234 if (!hWnd) { | |
235 MessageBox(NULL, | |
236 _T("Call to CreateWindow failed!"), | |
237 _T("hello_nacl_plus"), | |
238 NULL); | |
239 | |
240 return 1; | |
241 } | |
242 | |
243 ShowWindow(hWnd, | |
244 nCmdShow); | |
245 UpdateWindow(hWnd); | |
246 | |
247 // Main message loop: | |
248 MSG msg; | |
249 while (GetMessage(&msg, NULL, 0, 0)) { | |
250 TranslateMessage(&msg); | |
251 DispatchMessage(&msg); | |
252 } | |
253 | |
254 return (int) msg.wParam; | |
255 } | |
256 | |
257 // WndProc | |
258 LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) | |
259 { | |
260 PAINTSTRUCT ps; | |
261 HDC hdc; | |
262 TCHAR greeting[] = _T("Hello, World!"); | |
263 | |
264 switch (message) | |
265 { | |
266 case WM_PAINT: | |
267 hdc = BeginPaint(hWnd, &ps); | |
268 | |
269 // Here your application is laid out. | |
270 // For this introduction, we just print out "Hello, World!" | |
271 // in the top left corner. | |
272 TextOut(hdc, | |
273 5, 5, | |
274 greeting, _tcslen(greeting)); | |
275 // End application-specific layout section. | |
276 | |
277 EndPaint(hWnd, &ps); | |
278 break; | |
279 case WM_DESTROY: | |
280 PostQuitMessage(0); | |
281 break; | |
282 default: | |
283 return DefWindowProc(hWnd, message, wParam, lParam); | |
284 break; | |
285 } | |
286 | |
287 return 0; | |
288 } | |
289 #endif | |
290 | |
291 #ifdef STEP3 | |
292 // Replace WinMain with initInstanceInPCWindow so the NativeClient Module can | |
293 // launch the original application. | |
294 // Note the inclusion of a message-handling loop. STEP4 will replace the loop | |
295 // with a callback. | |
296 | |
297 void shutDown(void); | |
298 HINSTANCE g_hInstance = NULL; | |
299 HWND g_hWnd = NULL; | |
300 | |
301 int initInstanceInPCWindow() | |
302 { | |
303 WNDCLASSEX winClass; | |
304 MSG uMsg; | |
305 | |
306 memset(&uMsg,0,sizeof(uMsg)); | |
307 | |
308 winClass.lpszClassName = _T("MY_WINDOWS_CLASS"); | |
309 winClass.cbSize = sizeof(WNDCLASSEX); | |
310 winClass.style = CS_HREDRAW | CS_VREDRAW | CS_OWNDC; | |
311 winClass.lpfnWndProc = WndProc; | |
312 winClass.hInstance = g_hInstance; | |
313 winClass.hIcon = NULL; | |
314 winClass.hIconSm = NULL; | |
315 winClass.hCursor = LoadCursor(NULL, IDC_ARROW); | |
316 winClass.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH); | |
317 winClass.lpszMenuName = NULL; | |
318 winClass.cbClsExtra = 0; | |
319 winClass.cbWndExtra = 0; | |
320 | |
321 if (!RegisterClassEx(&winClass)) | |
322 return E_FAIL; | |
323 | |
324 g_hWnd = CreateWindowEx(NULL,_T("MY_WINDOWS_CLASS"), | |
325 _T("hello_nacl_plus"), | |
326 WS_OVERLAPPEDWINDOW, | |
327 0,0, 640, 480, NULL, NULL, g_hInstance, NULL); | |
328 | |
329 if (g_hWnd == NULL) | |
330 return E_FAIL; | |
331 | |
332 ShowWindow(g_hWnd, 1); | |
333 | |
334 UpdateWindow(g_hWnd); | |
335 | |
336 #ifdef STEP4 | |
337 // Skip the message loop, schedule a callback instead to periodically check | |
338 // for messages. Here we schedule at 100ms intervals. | |
339 myInstance->SendCallback(0); | |
340 return 0; | |
341 #else | |
342 // Main message loop, Windows style. | |
343 while(uMsg.message != WM_QUIT) { | |
344 if (PeekMessage(&uMsg, NULL, 0, 0, PM_REMOVE)) { | |
345 TranslateMessage(&uMsg); | |
346 DispatchMessage(&uMsg); | |
347 } | |
348 } | |
349 return uMsg.wParam; | |
350 #endif | |
351 | |
352 } | |
353 #endif | |
354 | |
355 #ifdef STEP5 | |
356 // Pass the text to the browser page, there is no separate app window anymore. | |
357 // The text is added as a new element to the page, it does not appear in the | |
358 // module's embed view. | |
359 void initInstanceInBrowserWindow() { | |
360 myInstance->PostMessage(pp::Var("Hello, Native Client!")); | |
361 } | |
362 #endif | |
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