串口发送程序可以收发数据了，就是占CPU太多了，这是何故？
发现一运行接收数据的函数就会占CPU，我的代码如下，我是通过一个线程调用一个死循环来检测是否收到数据的。
DWORD WINAPI ComRead(HWND hWnd)
{
    char ReadBuff[101]="";
    DWORD ReadLength1=0;
    DWORD ReadLength2=0;
    DWORD ReadFlag;
    OverCom.hEvent=CreateEvent(NULL,TRUE,FALSE,NULL);
while(1)
{
        SetCommMask(hdCom,EV_RXCHAR);
        WaitCommEvent(hdCom,&ComEvent,&OverCom);
        if((ComEvent&EV_RXCHAR)==EV_RXCHAR)
        {
            ClearCommError(hdCom,&ComError,&ComStat);
            ReadLength1=ComStat.cbInQue;
            if(ReadLength1>0)
            {
                ReadFlag=ReadFile(hdCom,&ReadBuff,ReadLength1,&ReadLength2,&OverCom);
                ReadBuff[ReadLength2]='\0';
                if(!ReadFlag)
                {
                    if(GetLastError()==ERROR_IO_PENDING)
                    {
                        while(!GetOverlappedResult(hdCom,&OverCom,&ReadLength2,TRUE ))
                        {
                            ComError=GetLastError();
                            if(ComError==ERROR_IO_PENDING)continue;
                        }

                    }
                }
            }
         ::PostMessage(hWnd,COM_READ,(unsigned int)ReadBuff,ReadLength2);
       //  strcpy(ReadBuff,"");
         ComEvent=0;
        }
}
}

用接收事件触发就不会占CPU了,