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我写了一个用来读串口数据的线程,但是不知道为什么,程序每次跑起来都非常慢,一卡一卡的,点一个按钮后,半天才响应.请哪位高手指点一下,怎样解决这个问题,有人说在循环中加入Application->ProcessMessage();  但我加入后出现以下错误[C++ Error] Unit1.cpp(122): E2247 '_fastcall TApplication::ProcessMessage(tagMSG &)' is not accessible

Unit1.H
#ifndef Unit1H
#define Unit1H
//---------------------------------------------------------------------------
#include
//---------------------------------------------------------------------------
class TReadThread : public TThread
{            
private:
        void __fastcall TReadThread::ReadData();
protected:
        void __fastcall Execute();
public:
        __fastcall TReadThread(bool CreateSuspended);
};
//---------------------------------------------------------------------------
#endif



Unit1.cpp
#include
#pragma hdrstop
#include "Unit1.h"
#include "Unit1MainForm.h"
#pragma package(smart_init)
extern HANDLE hComm;
extern int Flag;
extern int TimeOut=0;
extern int Len;
extern DWORD BytesRead;
extern char inbuff[128];

//---------------------------------------------------------------------------
//   Important: Methods and properties of objects in VCL can only be
//   used in a method called using Synchronize, for example:
//
//      Synchronize(UpdateCaption);
//
//   where UpdateCaption could look like:
//
//      void __fastcall TReadThread::UpdateCaption()
//      {
//        Form1->Caption = "Updated in a thread";
//      }
//---------------------------------------------------------------------------
__fastcall TReadThread::TReadThread(bool CreateSuspended)
        : TThread(CreateSuspended)
{
}
//---------------------------------------------------------------------------
void __fastcall TReadThread::Execute()
{
        //---- Place thread code here ----
        while (! Terminated) Synchronize(ReadData);
}
//---------------------------------------------------------------------------
void __fastcall TReadThread::ReadData()
{

if (hComm == INVALID_HANDLE_VALUE) return;
TimeOut++;
if(TimeOut>100)
{
    if(MainForm->CWButton1->Value ==true)
    {
      MainForm->Label4->Caption =AnsiString(Now())+"PC与单片机断开连接";
      MainForm->CWButton1->Value =false;
    }
    else
    {
      MainForm->CWButton1->Value =false;
    }
    TimeOut=0;
}
if(Flag==0)
{
    ReadFile(hComm, inbuff,1,&BytesRead,NULL);
    if(inbuff[0]==0x55)
    {
      Flag++;
      return;
    }
    else
    {
      Flag=0;
      return;
    }
}
else if(Flag==1)
{
    ReadFile(hComm, inbuff+1,1,&BytesRead,NULL);
    if(inbuff[1]==0x55)
    {
      Flag++;
      return;
    }
    else
    {
      Flag=0;
      return;
    }
}
else if(Flag==2)
{
    ReadFile(hComm, inbuff+2,2,&BytesRead,NULL);
    Len=inbuff[2];
    Len=Len*256+inbuff[3];
    Flag++;
    return;
}
else
{
    do
    {
      ReadFile(hComm, inbuff+4,Len-4,&BytesRead,NULL);
    }
    while(BytesRead<(Len-4));
    Flag=0;
    inbuff[Len]='\0';
    //MainForm->Memo1->Text = MainForm->Memo1->Text + inbuff[0]+inbuff[1]+inbuff[4]+inbuff[6]+inbuff[7]+inbuff[8]+'S';
    switch(inbuff[4])
    {
      case 0x41://单片机定时发送PC,表示已连接
      MainForm->CWButton1->Value =true;
      MainForm->Label4->Caption =AnsiString(Now())+" PC与单片机相连接";
      TimeOut=0;
      break;
      //单片机将各股道的状态传送给PC unsigned int TrainRoadUnit[4]
      //共32个股道每一位表示相应的股道的开(1)或关(0)
      case 0x43:
      MainForm->Label8->Caption="各股道的初始状态";

      break;




    }
    memset(inbuff,0x00,sizeof(inbuff));
}

}

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