qt_lirc按键

定义一个遥控器类，继承于QWSKeyboardHandler。
QSocketNotifier用来监听系统文件操作，通过signal/slot跟自定义的ReadRemoteData连接起来。
一旦lirc有数据提交，Qt就会通过ReadRemoteData读取到lirc的按键。
类定义：

 1 class RemoteHandler : public QObject, public QWSKeyboardHandler
 2 {
 3     Q_OBJECT
 4 public:
 5     bool loadFinish;
 6     RemoteHandler(const QString &device=QString("/dev/lircd"));
 7     ~RemoteHandler();
 8 private slots:
 9     void ReadRemoteData();
10 private:
11     int RemoteFd;
12     QSocketNotifier *RemoteNotifier;
13 };

实现的RemoteHandler构造函数：

 1 RemoteHandler::RemoteHandler(const QString &device)
 2 {
 3     struct sockaddr_un addr;
 4         addr.sun_family = AF_UNIX;
 5       strcpy(addr.sun_path, device.toLatin1().data());
 6 
 7         if ((RemoteFd = socket(AF_UNIX, SOCK_STREAM, 0)) != -1)
 8         {
 9                 if (::connect(RemoteFd, (struct sockaddr *)&addr, sizeof(addr)) != -1)
10         {
11                         int opts;
12                         if ((opts = fcntl(RemoteFd, F_GETFL)) != -1)
13                         {
14                                 opts = (opts | O_NONBLOCK);
15                                 if (fcntl(RemoteFd, F_SETFL, opts) != -1)
16                                 {
17                                     qDebug("LIRC %s: sucessfully started", __FUNCTION__);
18                                         char buf[2];
19                                     while (read(RemoteFd, buf, 1) > 0);
20                                         RemoteNotifier = new QSocketNotifier(RemoteFd, QSocketNotifier::Read, this);
21                                         connect(RemoteNotifier, SIGNAL(activated(int)), this, SLOT(ReadRemoteData()));
22                                 }
23                                 else
24                                      qDebug("LIRC %s: fcntl O_NONBLOCK failed", __FUNCTION__);
25                         }
26                         else
27                                 qDebug("LIRC %s: fcntl failed", __FUNCTION__);
28             }
29             else
30                     qDebug("LIRC %s: connect failed", __FUNCTION__);
31     }
32     else
33          qDebug("LIRC %s: socket failed", __FUNCTION__);
34 }

获取lirc的数据：

 1 void RemoteHandler::ReadRemoteData()
 2 {
 3     qDebug("RemoteHandler::ReadRemoteData");
 4         if (loadFinish)
 5         {
 6                 char readBuf[128] = {0};
 7                 if (read(RemoteFd, readBuf, sizeof(readBuf)) != -1)
 8                         qDebug("buf = %s", readBuf);
 9                 else
10                       qDebug("LIRC %s: read failed", __FUNCTION__);
11                 
12                 readBuf[strlen(readBuf)-1] = '\0';
13                 
14                 char scanCode[128]   = {0};
15                 char repeatStr[4]    = {0};
16                 char buttonName[128] = {0};
17                 char deviceName[128] = {0};
18                 sscanf(readBuf, "%s %s %s %s", &scanCode[0], &repeatStr[0], &buttonName[0], &deviceName[0]);
19                 char *end = NULL;
20                 long repeat = strtol(repeatStr, &end, 16);
21                 if (!end || *end != 0)
22                         return;
23                 if (repeat == 0)
24                 {
25                         if (strncmp(deviceName, DEVICENAME, strlen(deviceName)+1) == 0)
26                         {
27                                 int keyCode = 0;
28                                 if (strncmp(buttonName, CURSOR_UP, strlen(deviceName)+1) == 0)
29                                         keyCode = Qt::Key_Up;
30                                 else if (strncmp(buttonName, CURSOR_DOWN, strlen(deviceName)+1) == 0)
31                                       keyCode = Qt::Key_Down;
32                                 else if (strncmp(buttonName, OK, strlen(deviceName)+1) == 0)
33                                       keyCode = Qt::Key_Enter;                
34                                 processKeyEvent(0, keyCode, 0, 1, 0);
35                         }
36                 }
37         }
38         else
39         {
40                 char buf[2];
41                 while (read(RemoteFd, buf, 1) > 0);
42         }
43         
44 }