Поток альтернатива таймеру. Проверяет «возврат каретки» в файле для абзаца:
const
UM_MEMOCHAR = WM_USER + 22;
type
TForm1 = class(TForm)
Memo1: TMemo;
Button1: TButton;
procedure Button1Click(Sender: TObject);
private
procedure UMMemoChar(var Msg: TMessage); message UM_MEMOCHAR;
public
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
type
TCharSender = class(TThread)
private
FCharWait, FParWait: Integer;
FFormHandle: HWND;
FFS: TFileStream;
protected
procedure Execute; override;
public
constructor Create(FileName: string; CharWait, ParagraphWait: Integer;
FormHandle: HWND);
destructor Destroy; override;
end;
constructor TCharSender.Create(FileName: string; CharWait, ParagraphWait: Integer;
FormHandle: HWND);
begin
FCharWait := CharWait;
FParWait := ParagraphWait;
FFormHandle := FormHandle;
FFS := TFileStream.Create(FileName, fmOpenRead or fmShareDenyWrite);
FreeOnTerminate := True;
inherited Create(False);
end;
destructor TCharSender.Destroy;
begin
FFS.Free;
inherited;
end;
procedure TCharSender.Execute;
var
C: Char;
begin
while (FFS.Position < FFS.Size) and not Terminated do begin
FFS.Read(C, SizeOf(C));
if (C <> #10) then
PostMessage(FFormHandle, UM_MEMOCHAR, Ord(C), 0);
if C = #13 then
Sleep(FParWait)
else
Sleep(FCharWait);
end;
end;
{TForm1}
procedure TForm1.Button1Click(Sender: TObject);
begin
Memo1.Clear;
TCharSender.Create(
ExtractFilePath(Application.ExeName) + 'text.txt', 20, 1000, Handle);
end;
procedure TForm1.UMMemoChar(var Msg: TMessage);
begin
Memo1.SelStart := Memo1.Perform(WM_GETTEXTLENGTH, 0, 0);
Memo1.Perform(WM_CHAR, Msg.WParam, 0);
end;