main.cpp

透過rs232

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

#include <vcl.h>
#pragma hdrstop

#include "main.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
        : TForm(Owner)
{
}
//---------------------------------------------------------------------------
void __fastcall TForm1::BitBtn1Click(TObject *Sender)
{
  h_RS232 = CreateFile(ComboBox1->Text.c_str(),
                       GENERIC_READ | GENERIC_WRITE,
                       0,
                       NULL,
                       OPEN_EXISTING,
                       0,
                       NULL );
  if (h_RS232)
  {
    ShowMessage("Connect Success!");
    BitBtn1->Enabled = false;
    BitBtn2->Enabled = true;
    BitBtn3->Enabled = true;
  }
  else
  {
    ShowMessage("Connect Fail!");
    BitBtn1->Enabled = true;
    BitBtn2->Enabled = false;
    BitBtn3->Enabled = false;
  }
}
//---------------------------------------------------------------------------
void __fastcall TForm1::BitBtn2Click(TObject *Sender)
{
  if (h_RS232)
  {
    CloseHandle(h_RS232);
    ShowMessage("Disconnect!");
    BitBtn1->Enabled = true;
    BitBtn2->Enabled = false;
    BitBtn3->Enabled = false;
  }
}
//---------------------------------------------------------------------------
void __fastcall TForm1::BitBtn3Click(TObject *Sender)
{
  if ((h_RS232) && (Edit1->Text != ""))
  {
    DCB dcb;
    ZeroMemory(&dcb, sizeof(dcb));
    dcb.DCBlength = sizeof(dcb);

    dcb.BaudRate = 4800;
    dcb.ByteSize = 8;
    dcb.Parity   = NOPARITY;
    dcb.StopBits = ONESTOPBIT;

    if(SetCommState(h_RS232,&dcb))
    {
      DWORD ByteCount;
      WriteFile(h_RS232,
                Edit1->Text.c_str(),
                strlen(Edit1->Text.c_str()),
                &ByteCount,
                NULL);
    }
    Edit1->Text = "";
  }
}
//---------------------------------------------------------------------------