main.pas

《Delphi开发人员指南》配书原码

unit Main;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  ExtCtrls, DBCtrls, DB, DBTables, StdCtrls, Mask, Buttons, ComCtrls;

type
  TMainForm = class(TForm)
    tblSounds: TTable;
    dsSounds: TDataSource;
    tblSoundsWaveTitle: TStringField;
    tblSoundsWave: TBlobField;
    edTitle: TDBEdit;
    edFileName: TDBEdit;
    Label1: TLabel;
    Label2: TLabel;
    OpenDialog: TOpenDialog;
    tblSoundsFileName: TStringField;
    SaveDialog: TSaveDialog;
    pnlToobar: TPanel;
    sbPlay: TSpeedButton;
    sbAdd: TSpeedButton;
    sbSave: TSpeedButton;
    sbExit: TSpeedButton;
    Bevel1: TBevel;
    dbnNavigator: TDBNavigator;
    stbStatus: TStatusBar;
    procedure sbPlayClick(Sender: TObject);
    procedure sbAddClick(Sender: TObject);
    procedure sbSaveClick(Sender: TObject);
    procedure sbExitClick(Sender: TObject);
    procedure FormCreate(Sender: TObject);
  private
    procedure OnAppHint(Sender: TObject);
  end;

var
  MainForm: TMainForm;

implementation

{$R *.DFM}

uses MMSystem;

procedure TMainForm.sbPlayClick(Sender: TObject);
var
  B: TBlobStream;
  M: TMemoryStream;
begin
  B := TBlobStream.Create(tblSoundsWave, bmRead); // create blob stream
  Screen.Cursor := crHourGlass;                   // wait hourglass
  try
    M := TMemoryStream.Create;                    // create memory stream
    try
      M.CopyFrom(B, B.Size);             // copy from blob to memory stream
      // Attempt to play sound.  Raise exception if something goes wrong
      Win32Check(PlaySound(M.Memory, 0, SND_SYNC or SND_MEMORY));
    finally
      M.Free;
    end;
  finally
    Screen.Cursor := crDefault;
    B.Free;                                       // clean up
  end;
end;

procedure TMainForm.sbAddClick(Sender: TObject);
begin
  if OpenDialog.Execute then
  begin
    tblSounds.Append;
    tblSounds['FileName'] := ExtractFileName(OpenDialog.FileName);
    tblSoundsWave.LoadFromFile(OpenDialog.FileName);
    edTitle.SetFocus;
  end;
end;

procedure TMainForm.sbSaveClick(Sender: TObject);
begin
  with SaveDialog do
  begin
    FileName := tblSounds['FileName'];    // initialize file name
    if Execute then                       // execute dialog
      tblSoundsWave.SaveToFile(FileName); // save blob to file
  end;
end;

procedure TMainForm.sbExitClick(Sender: TObject);
begin
  Close;
end;

procedure TMainForm.FormCreate(Sender: TObject);
begin
  Application.OnHint := OnAppHint;
end;

procedure TMainForm.OnAppHint(Sender: TObject);
begin
  stbStatus.SimpleText := Application.Hint;
end;

end.