mainform.cpp

C++Builder程序员编程手记《配书光盘》

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

#include <vcl.h>
#pragma hdrstop

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

void __fastcall TForm1::Button1Click(TObject *Sender)
{
  HANDLE HMODEM;
  COMMPROP lpCommProp;

  HMODEM=CreateFile("Modem",GENERIC_READ|GENERIC_WRITE,0,NULL,OPEN_EXISTING,FILE_FLAG_OVERLAPPED,NULL);
  if (HMODEM == INVALID_HANDLE_VALUE)
  {
    ShowMessage("无效的设备句柄");
    return;
  }
  lpCommProp.dwProvSubType=PST_MODEM;
  if(GetCommProperties(HMODEM,&lpCommProp))
  {
    switch(lpCommProp.dwProvSubType)
    {
      case PST_FAX:
        Memo1->Lines->Add("FAX device");
        break;
      case PST_LAT:
        Memo1->Lines->Add("LAT protocol");
        break;
	    case PST_MODEM:
        Memo1->Lines->Add("FAX device");
        break;
      case PST_NETWORK_BRIDGE:
        Memo1->Lines->Add("Unspecified network bridge");
        break;
      case PST_PARALLELPORT:
        Memo1->Lines->Add("Parallel port");
        break;
      case PST_RS232:
        Memo1->Lines->Add("RS-232 serial port");
        break;
      case PST_RS422:
        Memo1->Lines->Add("RS-422 port");
        break;
      case PST_RS423:
        Memo1->Lines->Add("RS-423 port");
        break;
      case PST_RS449:
        Memo1->Lines->Add("RS-449 port");
        break;
      case PST_SCANNER:
        Memo1->Lines->Add("Scanner device");
        break;
      case PST_TCPIP_TELNET:
        Memo1->Lines->Add("TCP/IP Telnet