串口调试助手源码delphi

串口调试助手是一种常用的串口通信工具，用于帮助开发人员调试串口设备。Delphi是一种流行的编程语言，可以用来设计和开发Windows应用程序。下面是一个示例Delphi的串口调试助手源码：

unit Main;

interface

uses
  Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
  Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.ExtCtrls, Vcl.StdCtrls;

type
  TForm1 = class(TForm)
    Panel1: TPanel;
    ComboBox1: TComboBox;
    Edit1: TEdit;
    Button1: TButton;
    Memo1: TMemo;
    Timer1: TTimer;
    procedure Button1Click(Sender: TObject);
    procedure Timer1Timer(Sender: TObject);
    procedure FormCreate(Sender: TObject);
    procedure FormClose(Sender: TObject; var Action: TCloseAction);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;
  hComm: THandle;

implementation

{$R *.dfm}

procedure TForm1.FormCreate(Sender: TObject);
begin
  ComboBox1.Items.Assign(GetCommPortNames);
  Timer1.Enabled := False;
end;

procedure TForm1.FormClose(Sender: TObject; var Action: TCloseAction);
begin
  if hComm <> INVALID_HANDLE_VALUE then
    CloseHandle(hComm);
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  if Button1.Caption = '打开串口' then
  begin
    hComm := OpenCommPort(ComboBox1.Text);
    if hComm <> INVALID_HANDLE_VALUE then
    begin
      Button1.Caption := '关闭串口';
      Timer1.Enabled := True;
    end
    else
      ShowMessage('无法打开串口');
  end
  else
  begin
    CloseCommPort(hComm);
    Button1.Caption := '打开串口';
    Timer1.Enabled := False;
  end;
end;

procedure TForm1.Timer1Timer(Sender: TObject);
var
  Buffer: array[0..255] of Char;
  BytesRead: Cardinal;
begin
  if ReadCommPort(hComm, Buffer, SizeOf(Buffer), BytesRead) then
    Memo1.Lines.Add(Buffer);
end;

function GetCommPortNames: TStrings;
var
  Reg: TRegistry;
  PortNames: TStringList;
  i: Integer;
begin
  Reg := TRegistry.Create;
  PortNames := TStringList.Create;
  try
    Reg.RootKey := HKEY_LOCAL_MACHINE;
    if Reg.OpenKeyReadOnly('HARDWARE\DEVICEMAP\SERIALCOMM') then
    begin
      Reg.GetValueNames(PortNames);
      Reg.CloseKey;
      for i := 0 to PortNames.Count - 1 do
        PortNames.Strings[i] := Reg.ReadStringDefault(PortNames.Strings[i], '');
    end;
  finally
    Reg.Free;
    Result := PortNames;
  end;
end;

function OpenCommPort(const PortName: String): THandle;
begin
  Result := CreateFile(
    PChar('\\.\' + PortName),
    GENERIC_READ or GENERIC_WRITE,
    0,
    nil,
    OPEN_EXISTING,
    FILE_FLAG_OVERLAPPED,
    0);
end;

function CloseCommPort(hComm: THandle): Boolean;
begin
  Result := CloseHandle(hComm);
end;

function ReadCommPort(hComm: THandle; var Buffer; Count: Cardinal; var BytesRead: Cardinal): Boolean;
var
  Ov: TOverlapped;
begin
  FillChar(Ov, SizeOf(Ov), 0);
  Ov.hEvent := CreateEvent(nil, True, False, nil);
  try
    Result := ReadFile(hComm, Buffer, Count, BytesRead, @Ov);
    if not Result then
      Result := (GetLastError = ERROR_IO_PENDING) and GetOverlappedResult(hComm, Ov, BytesRead, True);
  finally
    CloseHandle(Ov.hEvent);
  end;
end;

end.

这个源码实现了一个简单的串口调试助手窗口应用程序。用户可以通过下拉框选择串口号，然后点击按钮进行打开或关闭串口。打开串口后，定时器组件会周期性地读取串口输入缓冲区的数据，并显示在文本框中。用户也可以通过输入框发送数据到串口设备。这个源码使用了Windows API函数来打开、关闭和读取串口。