QT QCopChannel 进程间通信

Qt 的内部进程通信机制

https://www.ibm.com/developerworks/cn/linux/l-qtcommu/

 

QT QCopChannel 机制只存在于Qt的嵌入式版本当中

 

发送信息

 

#ifdef SUPPORT_QCOPCHANNEL// TODO: ---------- 发送信息函数封装, 焦点Y坐标void myLine::sendGlobalY(int globalY){#ifdef qte_elinux QByteArray data; QDataStream out(&data, QIODevice::WriteOnly); out << globalY; QCopChannel::send("/CInputLine/IM", "handleMsg(int)", data);#endif}#endif

 

#ifdef SUPPORT_QCOPCHANNEL// TODO: ----------------发送输入框可输入文本类型void myLine::sendKeyBoardType(int defaultTextType){#ifdef qte_elinux QByteArray data; QDataStream out(&data, QIODevice::WriteOnly); out << defaultTextType; QCopChannel::send("/CInputLine/IM", "showKeyboardType(int)", data);#endif}#endif// TODO: ---------- 发送信号void myLine::mousePressEvent(QMouseEvent *event){#ifdef SUPPORT_QCOPCHANNEL qDebug("当前焦点进入输入框，点击的坐标为(%d, %d) /n", event->globalX(), event->globalY()); sendGlobalY(event->globalY()); qDebug("输入框可输入文本类型是 %d /n", this->defaultTextType); sendKeyBoardType(this->defaultTextType);#endif#ifndef SUPPORT_QCOPCHANNEL int globalY = event->globalY(); int defaultTextType = this->defaultTextType; emit cinputline_clicked(globalY, defaultTextType);#endif}

 

在需要接受信息的类中添加监听

 

#ifdef SUPPORT_QCOPCHANNELvoid KeyBoard :: listenChannel() { QCopChannel *channel = new QCopChannel("/CInputLine/IM", this); connect(channel, SIGNAL(received(const QString &, const QByteArray &)), this, SLOT(handleMsg(const QString &, const QByteArray &)));}#endif

 

在构造函数当中注册该监听，那么当该类实例存在时，都会去监听这条channel

 

#ifdef SUPPORT_QCOPCHANNEL// TODO : 监听输入框是否发送过来信号// listenChannel();#endif

 

接受信息

#ifdef SUPPORT_QCOPCHANNELvoid KeyBoard::handleMsg(const QString &message, const QByteArray &data) { isCInputLine = true; QDataStream in(data); if (message == "handleMsg(int)") // 输入法显示位置 { isClickedClose = false; // 没有点击关闭按钮 int globalY; in >> globalY; handleGlobalY(globalY); } else if (message == "showMouse(bool)") { // 显示鼠标 // 显示鼠标 bool isShowMouse; in >> isShowMouse; if(isShowMouse) { qDebug("show mouse ====================== /n"); } else { qDebug("hide mouse ====================== /n"); } QWSServer::setCursorVisible(isShowMouse); } else if(message == "showKeyboardType(int)") { // 显示输入法软键盘类型 int defaultTextType; in >> defaultTextType; if(defaultTextType == 0) { // 显示字母 qDebug("默认输入文本为字母，显示字母软键盘(show abc softKeybaord)/n"); this->setKeyBoardType(SWITCH_TO_abc); changeSoftKey(); } else if(defaultTextType == 1) { // 显示数字 qDebug("默认输入文本为数字，显示数字软键盘(show 123 softKeyboard)/n"); this->setKeyBoardType(SWITCH_TO_NUM); changeSoftKey(); } else if(defaultTextType == 2) { this->setKeyBoardType(SWITCH_TO_abc); changeSoftKey(); this->isEnglish = false; }else { ; // VOID } this->update(); }}#endifvoid KeyBoard::handleGlobalY(int globalY) { qDebug("in handleGlobalY() , globalY = %d /n", globalY);// globalY = 400; if(globalY >360) { // 将软键盘显示在下方 setDisplayLocation(KeyBoard_Display_Top); qDebug("> 360, globalY = %d /n", globalY); } else { // 将软键盘显示在下方 setDisplayLocation(KeyBoard_Display_Bottom); qDebug("< 360, globalY = %d /n", globalY); }}