是关于串口通信的一个简单的程序,源码如下://---------------------------------------------------------------------------

#include <vcl.h>
#pragma hdrstop

#include "Unit1.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma link "TComm1"
#pragma resource "*.dfm"
TForm1 *Form1;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
        : TForm(Owner)
{
}
//---------------------------------------------------------------------------

void __fastcall TForm1::BitBtn1Click(TObject *Sender)
{
if(Comm1->PortOpen)
{ShowMessage("Port has been opened!");
return;
}
if(RadioGroup1->ItemIndex==0) Comm1->CommPort=pnCOM1;
else  Comm1->CommPort=pnCOM2;
Comm1->PortOpen=true;
}
//---------------------------------------------------------------------------
void __fastcall TForm1::BitBtn3Click(TObject *Sender)
{
Comm1->OutputString(Memo1->Text);
}
//---------------------------------------------------------------------------
void __fastcall TForm1::BitBtn4Click(TObject *Sender)
{
Memo2->Text=Comm1->Input;
}
//---------------------------------------------------------------------------
void __fastcall TForm1::BitBtn2Click(TObject *Sender)
{
if(!Comm1->PortOpen)
Comm1->PortOpen=false;
exit(0);
}

在文件还没保存时是可以运行的而且调试也成功,但一经保存后便出现错误,如下提示:
[Linker Fatal Error] Fatal: Expected a file name:
此是为何?望不悭指教.