写程序中，我们往往需要打开图片，或者打开其他文件，以下是一个最 简单的打开文件操作；

源文件下载地址：http://download.csdn.net/detail/cq20110310/6857603

 

 

unit uOpenFile;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, ExtCtrls, ExtDlgs,jpeg;

type
  TForm1 = class(TForm)
    btnOpenFile: TButton;
    image: TImage;

    OpenDialog: TOpenDialog;

    procedure btnOpenFileClick(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.btnOpenFileClick(Sender: TObject);
var
  openPath:string;
begin
   OpenDialog.Title := '打开图片';
   OpenDialog.filter :=  '全部 (*.jpg;*.jpeg;*.bmp;*.ico;*.emf;*.wmf;*.png)|*.jpg;*.jpeg;*.bmp;*.i' + 
      'co;*.emf;*.wmf;*.png|JPEG 图像文件 (*.jpg)|*.jpg|JPEG 图像文件 (*.jpeg)|*.jpeg' + 
      '|位图 (*.bmp)|*.bmp|图标 (*.ico)|*.ico|增强图元文件 (*.emf)|*.emf|图元文件 (*.' + 
      'wmf)|*.wmf|可移植图片(*.png)|*.png';



  if openDialog.Execute then
  begin
      openPath:=OpenDialog.FileName;
      image.Picture.LoadFromFile(openPath);
      image.AutoSize:=False;
      image.Stretch:=True;
  end;

  end;

end.