如何检测硬件按钮！

在Palm编程中，有些程序需要用到硬件按钮来实现一些快捷功能，下面这段代码就演示了如何判断常用的6个硬件按钮，其他的按钮可类似处理！

cpp 代码

static   void  AppEventLoop( void )
{
    Err error;
    EventType event;
    Boolean isDatebookKey;   //日期按钮
    Boolean isAddressKey;    //地址按钮
    Boolean isMemoListKey;   //memo 按钮
    Boolean isToDoListKey;   //to do按钮
    Boolean isCalculateKey;  //计算器按钮
    Boolean isFindKey;       //查找
    Boolean isHouse;         //小房子

     do
    {
        EvtGetEvent(&event, evtWaitForever);
        isDatebookKey = (event.eType == keyDownEvent)
                                 && (TxtCharIsHardKey(event.data.keyDown.modifiers, event.data.keyDown.chr))
                                 && (event.data.keyDown.chr == vchrHard1);

        isAddressKey = (event.eType == keyDownEvent)
                              && (TxtCharIsHardKey(event.data.keyDown.modifiers, event.data.keyDown.chr))
                              && (event.data.keyDown.chr == vchrHard2);

        isMemoListKey = (event.eType == keyDownEvent)
                                && (TxtCharIsHardKey(event.data.keyDown.modifiers, event.data.keyDown.chr))
                                && (event.data.keyDown.chr == vchrHard3);

        isToDoListKey = (event.eType == keyDownEvent)
                                && (TxtCharIsHardKey(event.data.keyDown.modifiers, event.data.keyDown.chr))
                                && (event.data.keyDown.chr == vchrHard4);

        isCalculateKey = (event.eType == keyDownEvent)
                               && (TxtCharIsHardKey(event.data.keyDown.modifiers, event.data.keyDown.chr))
                               && (event.data.keyDown.chr == vchrCalc);

         // 注意：House和Find按钮不需要用到TxtCharIsHardKey()
        isHouse = (event.eType == keyDownEvent) && (event.data.keyDown.chr == vchrLaunch);

        isFindKey = (event.eType == keyDownEvent) && (event.data.keyDown.chr == vchrFind);

        SysHandleEvent(&event))
             if  (!SysHandleEvent(&event))
                 if  (! MenuHandleEvent(0, &event, &error))
                     if  (! AppHandleEvent(&event))
                        FrmDispatchEvent(&event);

    }  while  (event.eType != appStopEvent);
}