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TouchHook.cpp
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TouchHook.cpp
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/*
Touch2Tuio - Windows 7 Touch to TUIO Bridge
http://dm.tzi.de/research/hci/touch2tuio
Copyright (c) 2010 Marc Herrlich and Benjamin Walther-Franks, Research Group Digital Media, TZI, University of Bremen
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
// TouchHook.cpp : Defines the exported functions for the DLL application.
//
#include "stdafx.h"
#include "TouchHook.h"
// fwd declaration
LRESULT CALLBACK GetMsgProc(int nCode, WPARAM wParam, LPARAM lParam);
LRESULT CALLBACK LowLevelMouseProc(int nCode, WPARAM wParam, LPARAM lParam);
// from dllmain.cpp
extern HMODULE g_this;
extern DWORD g_consoleId;
extern int g_serverPort;
extern char g_host[CHAR_BUFFER_SIZE];
extern HWND g_targetWnd;
extern HHOOK g_hook;
extern HHOOK g_mouseHook;
extern int g_screen_offsetX;
extern int g_screen_offsetY;
extern unsigned int g_screen_width;
extern unsigned int g_screen_height;
extern bool g_detect_screen_size;
// process private data
const unsigned int TIMER_IDENTIFIER(123);
const unsigned int TIMER_CALL_TIME(100);
const unsigned int MAX_CURSOR_IDLE_TIME(300);
const ULONG TOUCH_FLAGS_2(/*TWF_FINETOUCH|*/TWF_WANTPALM);
bool s_initialized(false);
HANDLE s_out(0);
UINT_PTR s_timer(0);
typedef std::map<DWORD, TUIO::TuioCursor*> CursorMap;
typedef std::list<HWND> HandleList;
std::auto_ptr<TUIO::TuioServer> s_server(0);
std::auto_ptr<CursorMap> s_cursors(0);
std::auto_ptr<CursorMap> s_cursorBuf(0);
std::auto_ptr<HandleList> s_windows(0);
char s_buf[CHAR_BUFFER_SIZE] = "";
DWORD s_ccount(0);
BOOL CALLBACK EnumWindowsProc(HWND hwnd, LPARAM lParam)
{
if (hwnd)
{
s_windows->push_back(hwnd);
}
return TRUE;
}
static void InitializeWindowsMap(void)
{
s_windows.reset(new HandleList);
EnumWindows(EnumWindowsProc, 0);
}
static void ToLowerString(std::string &s)
{
for (size_t i = 0; i < s.length(); ++i)
{
s[i] = tolower(s[i]);
}
}
static HWND FindWindowHandle(const char *windowTitle)
{
char buf[CHAR_BUFFER_SIZE];
std::string searchTitle(windowTitle);
ToLowerString(searchTitle);
for (HandleList::iterator it = s_windows->begin(); it != s_windows->end(); ++it)
{
GetWindowText(*it, buf, sizeof(buf));
std::string s(buf);
ToLowerString(s);
if (s.find(searchTitle) == 0)
{
return *it;
}
}
return 0;
}
TOUCHHOOK_API void SetConsoleId(DWORD consoleId)
{
g_consoleId = consoleId;
}
TOUCHHOOK_API void SetTuioServerAddress(const char* host, int port)
{
strcpy_s(g_host, host);
g_serverPort = port;
}
TOUCHHOOK_API void SetWindowRect(int offsetX, int offsetY, int width, int height)
{
g_screen_offsetX = offsetX;
g_screen_offsetY = offsetY;
g_screen_width = width;
g_screen_height = height;
g_detect_screen_size = false;
}
TOUCHHOOK_API bool InstallHookFromWindowTitle(const char *windowTitle)
{
InitializeWindowsMap();
g_targetWnd = FindWindowHandle(windowTitle);
if (!g_targetWnd)
return false;
unsigned long threadId = GetWindowThreadProcessId(g_targetWnd, 0);
if (!threadId)
return false;
g_hook = SetWindowsHookEx(WH_GETMESSAGE, GetMsgProc, g_this, threadId);
return (g_hook) ? true : false;
}
TOUCHHOOK_API bool RemoveHook(void)
{
if (!g_hook || ! g_targetWnd)
return false;
BOOL ret1 = UnhookWindowsHookEx(g_hook);
g_hook = 0;
BOOL ret2 = UnhookWindowsHookEx(g_mouseHook);
g_mouseHook = 0;
//make sure to clear everything on remove
g_targetWnd = NULL;
s_windows.reset();
return (ret1 && ret2);
}
LRESULT CALLBACK GetMsgProc(int nCode, WPARAM wParam, LPARAM lParam)
{
if (!s_initialized)
{
if (!AttachConsole(g_consoleId))
{
FreeConsole();
AttachConsole(g_consoleId);
}
s_out = GetStdHandle(STD_OUTPUT_HANDLE); // TODO: we don't really close it
sprintf_s(s_buf, "Attached console\n");
WriteConsole(s_out, s_buf, strlen(s_buf), &s_ccount, 0);
if (!g_mouseHook)
{
g_mouseHook = SetWindowsHookEx(WH_MOUSE_LL, LowLevelMouseProc, g_this, 0); // mouse_ll global only (requires process with message loop)
if (g_mouseHook)
{
sprintf_s(s_buf, "Installed mouse hook\n");
WriteConsole(s_out, s_buf, strlen(s_buf), &s_ccount, 0);
}
else
{
sprintf_s(s_buf, "Could not install mouse hook\n");
WriteConsole(s_out, s_buf, strlen(s_buf), &s_ccount, 0);
}
}
if (g_detect_screen_size)
{
HWND win = GetDesktopWindow();
RECT rec;
GetWindowRect(win, &rec);
g_screen_height = rec.bottom;
g_screen_width = rec.right;
}
sprintf_s(s_buf, "X-Offset: %i Y-Offset: %i Width: %i Height: %i\n", g_screen_offsetX, g_screen_offsetY, g_screen_width, g_screen_height);
WriteConsole(s_out, s_buf, strlen(s_buf), &s_ccount, 0);
s_cursors.reset(new CursorMap);
s_cursorBuf.reset(new CursorMap);
s_server.reset(new TUIO::TuioServer(g_host, g_serverPort));
sprintf_s(s_buf, "Created server (%s:%i)\n", g_host, g_serverPort);
WriteConsole(s_out, s_buf, strlen(s_buf), &s_ccount, 0);
s_timer = SetTimer(g_targetWnd, TIMER_IDENTIFIER, TIMER_CALL_TIME, 0);
s_initialized = true;
}
if (nCode < 0) // do not process message
{
return CallNextHookEx(0, nCode, wParam, lParam);
}
switch (nCode)
{
case HC_ACTION:
{
LPMSG msg = (LPMSG)lParam;
// register everything for touch
// Note: pretty ugly but seems to be the only possibility to register every window
RegisterTouchWindow(msg->hwnd, TOUCH_FLAGS_2);
switch (msg->message)
{
case WM_POINTERUP:
{
s_server->initFrame(TUIO::TuioTime::getSessionTime());
s_server->removeTuioCursor((*s_cursors)[GET_POINTERID_WPARAM(msg->wParam)]);
s_server->commitFrame();
std::map<DWORD, TUIO::TuioCursor*>::iterator cursorIt = s_cursors->find(GET_POINTERID_WPARAM(msg->wParam));
s_cursors->erase(cursorIt);
}
break;
case WM_POINTERDOWN:
{
s_server->initFrame(TUIO::TuioTime::getSessionTime());
POINTS p = MAKEPOINTS(msg->lParam);
(*s_cursors)[GET_POINTERID_WPARAM(msg->wParam)] = s_server->addTuioCursor(
((p.x)+g_screen_offsetX)/(float)(g_screen_width+g_screen_offsetX),
((p.y)+g_screen_offsetY)/(float)(g_screen_height+g_screen_offsetY));
s_server->commitFrame();
}
break;
case WM_POINTERUPDATE:
{
s_server->initFrame(TUIO::TuioTime::getSessionTime());
POINTS p = MAKEPOINTS(msg->lParam);
s_server->updateTuioCursor((*s_cursors)[GET_POINTERID_WPARAM(msg->wParam)],
((p.x)+g_screen_offsetX)/(float)(g_screen_width+g_screen_offsetX),
((p.y)+g_screen_offsetY)/(float)(g_screen_height+g_screen_offsetY));
s_server->commitFrame();
}
break;
case WM_TOUCH:
{
sprintf_s(s_buf, "Touches received:\n");
WriteConsole(s_out, s_buf, strlen(s_buf), &s_ccount, 0);
UINT cInputs = LOWORD(msg->wParam);
PTOUCHINPUT pInputs = new TOUCHINPUT[cInputs];
if (NULL != pInputs)
{
if (GetTouchInputInfo((HTOUCHINPUT)msg->lParam,
cInputs,
pInputs,
sizeof(TOUCHINPUT)))
{
s_server->initFrame(TUIO::TuioTime::getSessionTime());
// process pInputs
for (UINT i=0; i<cInputs; ++i)
{
sprintf_s(s_buf, "ID: %i, X: %i, Y: %i\n", pInputs[i].dwID, pInputs[i].x, pInputs[i].y);
WriteConsole(s_out, s_buf, strlen(s_buf), &s_ccount, 0);
std::map<DWORD, TUIO::TuioCursor*>::iterator cursorIt = s_cursors->find(pInputs[i].dwID);
if (cursorIt != s_cursors->end())
{
// found
s_server->updateTuioCursor(cursorIt->second,
((pInputs[i].x*0.01f)+g_screen_offsetX)/(float)(g_screen_width+g_screen_offsetX),
((pInputs[i].y*0.01f)+g_screen_offsetY)/(float)(g_screen_height+g_screen_offsetY));
if(!(pInputs[i].dwFlags & TOUCHEVENTF_UP))
{
(*s_cursorBuf)[pInputs[i].dwID] = cursorIt->second;
s_cursors->erase(cursorIt);
}
}
else
{
// not found
(*s_cursorBuf)[pInputs[i].dwID] = s_server->addTuioCursor(
((pInputs[i].x*0.01f)+g_screen_offsetX)/(float)(g_screen_width+g_screen_offsetX),
((pInputs[i].y*0.01f)+g_screen_offsetY)/(float)(g_screen_height+g_screen_offsetY));
}
}
for (std::map<DWORD, TUIO::TuioCursor*>::iterator it = s_cursors->begin(); it != s_cursors->end(); it++)
{
s_server->removeTuioCursor(it->second);
}
s_cursors->clear();
std::auto_ptr<CursorMap> tmp(s_cursorBuf);
s_cursorBuf = s_cursors;
s_cursors = tmp;
s_server->commitFrame();
}
}
delete[] pInputs;
}
break;
case WM_TIMER:
{
if (msg->wParam == TIMER_IDENTIFIER)
{
BOOL frameOpen(false);
for (std::map<DWORD, TUIO::TuioCursor*>::iterator it = s_cursors->begin(); it != s_cursors->end();)
{
long delta = TUIO::TuioTime::getSessionTime().getTotalMilliseconds() - it->second->getTuioTime().getTotalMilliseconds();
if (delta > MAX_CURSOR_IDLE_TIME)
{
if (!frameOpen)
{
s_server->initFrame(TUIO::TuioTime::getSessionTime());
frameOpen = true;
}
s_server->removeTuioCursor(it->second);
std::map<DWORD, TUIO::TuioCursor*>::iterator tmp = it++;
s_cursors->erase(tmp);
sprintf_s(s_buf, "Removed cursor due to time limit\n");
WriteConsole(s_out, s_buf, strlen(s_buf), &s_ccount, 0);
}
else
{
++it;
}
}
if (frameOpen)
{
s_server->commitFrame();
}
}
}
break;
}
}
break;
}
return CallNextHookEx(0, nCode, wParam, lParam);
}
LRESULT CALLBACK LowLevelMouseProc(int nCode, WPARAM wParam, LPARAM lParam)
{
if (nCode < 0) // do not process message
{
return CallNextHookEx(0, nCode, wParam, lParam);
}
LPMSLLHOOKSTRUCT msg = (LPMSLLHOOKSTRUCT)lParam;
if (msg->flags & LLMHF_INJECTED) // block injected events (in most cases generated by touches)
{
sprintf_s(s_buf, "Blocked injected (touch) mouse event\n");
WriteConsole(s_out, s_buf, strlen(s_buf), &s_ccount, 0);
return 1;
}
// forward event
return CallNextHookEx(0, nCode, wParam, lParam);
}