Discussion :

[thecaptain]

Salut à tous,

J'aimerais pouvoir dans une application tournant en tâche de fond (comme un service par exemple - donc pas de Swing) pouvoir récupérer les évènements clavier (telle la classe KeyListener) donc pouvoir placer un écouteur au niveau OS pendant que l'application tourne en tâche de fond (donc pas de focus). Vous auriez une idée de comment je dois aborder la chose ?

merci d'avance !

@++

[Gfx]

Avec JNI. C'est un peu complique sous Windows car il faut creer une DLL avec son propre espace d'addressage memoire et definir des instances partagees avec des directives du compilateur.

Exemple de code qui intercepte les evenement clavier n'importe ou dans le systeme pour piloter iTunes.

L'application principale :

Code :

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///////////////////////////////////////////////////////////////////////////
// INCLUDES
///////////////////////////////////////////////////////////////////////////
#include "Trinklet.h"
 
///////////////////////////////////////////////////////////////////////////
// MAIN ENTRY POINT
///////////////////////////////////////////////////////////////////////////
int WINAPI WinMain(HINSTANCE hInstance,
                   HINSTANCE hPrevInstance,
                   LPTSTR    lpCmdLine,
                   int       nCmdShow) {
	MSG msg;
 
	CoInitialize(0);
	Trinklet_InstallHook(GetCurrentThreadId());
 
	while (GetMessage(&msg, NULL, 0, 0)) {
		if (msg.message == WM_DESTROY) {
			break;
		}
	}
 
	Trinklet_UnInstallHook();
	CoUninitialize();
 
	return 0;
}

Et la DLL responsable de la gestion des touches. Note les instances partagees definies dans la section GLOBALS.

Code :

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/* Copyright (c) 2005 Romain Guy <romain.guy@mac.com>
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
///////////////////////////////////////////////////////////////////////////
// INCLUDES
///////////////////////////////////////////////////////////////////////////
#include "TrinkletGlobalKeys.h"
 
//////////////////////////////////////////////////////////////////
// GLOBALS
//////////////////////////////////////////////////////////////////
// Dev-C++/mingw/gcc win32
#ifdef _DEVCPP
HHOOK        g_hHook     __attribute__((section ("shared"), shared)) = NULL;
HINSTANCE    g_hInstance __attribute__((section ("shared"), shared)) = NULL;
DWORD        g_threadId  __attribute__((section ("shared"), shared)) = 0;
// Visual Studio
#else
#pragma comment(linker, "/SECTION:.SHARDATA,RWS")
#pragma data_seg(".SHARDATA")
HHOOK        g_hHook     = NULL;           // handle to the hook
HINSTANCE    g_hInstance = NULL;           // handle to the current DLL instance
DWORD        g_threadId  = 0;              // handle to application thread ID
#pragma data_seg()
#endif
 
pTrinkletKeyCodes g_keysConf  = NULL;      // handle to keys configuration
 
//////////////////////////////////////////////////////////////////
// HOOKS
//////////////////////////////////////////////////////////////////
// keyboard hook, system wide
LRESULT CALLBACK Trinklet_KeyboardHook(int nCode,
									   WPARAM wParam,
									   LPARAM lParam) {
	if (nCode == HC_ACTION)	{
		// Ctrl+Alt+[A key]
		// if the key wasn't down before this call, we skip the message
		if (GetAsyncKeyState(VK_CONTROL) &&
			GetAsyncKeyState(VK_MENU) &&
			!(lParam & 0x040000000)) {
 
			CComPtr<IiTunes> app;
			HRESULT hr = app.CoCreateInstance(CLSID_iTunesApp);
			if (hr == S_OK) {
				UINT scanCode   = MapVirtualKeyEx(wParam, 0, GetKeyboardLayout(0));
 
				if (g_keysConf == NULL) {
					g_keysConf = Trinklet_SetupKeys();
				}
 
				if (scanCode == g_keysConf->previous) {
					app->PreviousTrack();
				} else if (scanCode == g_keysConf->play) {
					app->Play();
				} else if (scanCode == g_keysConf->pause) {
					app->Pause();
				} else if (scanCode == g_keysConf->stop) {
					app->Stop();
				} else if (scanCode == g_keysConf->next) {
					app->NextTrack();
				} else if (scanCode == g_keysConf->shutdown) {
 
				} else if (scanCode == g_keysConf->exit) {
					PostThreadMessage(g_threadId, WM_DESTROY, 0, 0);
				}
			}
		}
	}
 
	return CallNextHookEx(g_hHook, nCode, wParam, lParam);
}
 
// installs the hook
HOOKDLL_API BOOL Trinklet_InstallHook(DWORD threadId) {
	if (g_hHook == NULL) {
		g_hHook    = SetWindowsHookEx(WH_KEYBOARD,
										(HOOKPROC) Trinklet_KeyboardHook,
										g_hInstance, 0);
		g_threadId = threadId;
	}
 
	return (BOOL) (g_hHook != NULL);
}
 
// uninstalls the hook
BOOL HOOKDLL_API Trinklet_UnInstallHook() {
	BOOL resultOk = TRUE;
 
	if (g_hHook != NULL) {
		resultOk = UnhookWindowsHookEx(g_hHook);
		g_hHook = NULL;
	}
 
	return resultOk;
}
 
// handles some special keys like VK_PRIOR and VK_NEXT
SHORT GetKeyProfile(LPSTR name, LPSTR defaultValue, LPSTR iniPath) {
	// ... get a key from config
}
 
// stores the keys configuration
pTrinkletKeyCodes Trinklet_SetupKeys(void) {
	// ... loads keys configuration
}
 
//////////////////////////////////////////////////////////////////
// DLL ENTRY POINT
//////////////////////////////////////////////////////////////////
 
BOOL APIENTRY DllMain(HINSTANCE hinstDLL,
					  DWORD fdwReason,
					  LPVOID lpvReserved) {
	g_hInstance = hinstDLL;
	return TRUE;
}

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