学习官方示例 - TApplication.Icon

本例同时包含了 TOpenPictureDialog 控件的一些用法.

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代码文件:

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unit Unit1;



interface



uses

  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,

  Dialogs, ExtDlgs, StdCtrls;



type

  TForm1 = class(TForm)

    OpenPictureDialog1: TOpenPictureDialog;

    Button1: TButton;

    procedure Button1Click(Sender: TObject);

  end;



var

  Form1: TForm1;



implementation



{$R *.dfm}



procedure TForm1.Button1Click(Sender: TObject);

var 

  Done: Boolean;

begin

  OpenPictureDialog1.DefaultExt := GraphicExtension(TIcon);

  OpenPictureDialog1.FileName := GraphicFileMask(TIcon);

  OpenPictureDialog1.Filter := GraphicFilter(TIcon);

  OpenPictureDialog1.Options := [ofFileMustExist, ofHideReadOnly, ofNoChangeDir];



  Done := False;

  while not Done do {这个循环是让你必须找一个}

  begin

    if OpenPictureDialog1.Execute then

      if not (ofExtensionDifferent in OpenPictureDialog1.Options) then

        begin

          Application.Icon.LoadFromFile(OpenPictureDialog1.FileName);

          Done := True;

        end

    else

      Done := True;

  end;

end;



end.


 
   

窗体文件:

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object Form1: TForm1

  Left = 0

  Top = 0

  Caption = 'Form1'

  ClientHeight = 106

  ClientWidth = 142

  Color = clBtnFace

  Font.Charset = DEFAULT_CHARSET

  Font.Color = clWindowText

  Font.Height = -11

  Font.Name = 'Tahoma'

  Font.Style = []

  OldCreateOrder = False

  Position = poDesktopCenter

  PixelsPerInch = 96

  TextHeight = 13

  object Button1: TButton

    Left = 32

    Top = 56

    Width = 75

    Height = 25

    Caption = 'Button1'

    TabOrder = 0

    OnClick = Button1Click

  end

  object OpenPictureDialog1: TOpenPictureDialog

    Left = 56

    Top = 24

  end

end