unit2.cpp

RS232接口通讯程序

//---------------------------------------------------------------------------

#include <vcl.h>
#pragma hdrstop

#include "Unit2.h"
#include "Unit1.h"
#pragma package(smart_init)
//---------------------------------------------------------------------------

//   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";
//      }
//---------------------------------------------------------------------------

extern HANDLE hComm;
__fastcall TReadThread::TReadThread(bool CreateSuspended)
        : TThread(CreateSuspended)
{
}
//---------------------------------------------------------------------------
void __fastcall TReadThread::Execute()
{
        //---- Place thread code here ----
    while(!Terminated)Synchronize(ReadData);
}
//---------------------------------------------------------------------------


void __fastcall TReadThread::ReadData()
{
        //TODO: Add your source code here
        String Temp;
        char inbuff[1024];
        DWORD nBytesRead,dwEvent,dwError;
        COMSTAT cs;
        if(hComm==INVALID_HANDLE_VALUE) return;
        ClearCommError(hComm,&dwError,&cs);
        if(cs.cbInQue>sizeof(inbuff))
        {
           PurgeComm(hComm,PURGE_RXCLEAR);
           return;
        }
        ReadFile(hComm,inbuff,cs.cbInQue,&nBytesRead,NULL);
        inbuff[cs.cbInQue]='\0';
        Form1->Memo2->Text=Form1->Memo2->Text+inbuff;
}