unit1.pas

一系列DELPHI的控件如何使用的例子,例子有的比较简单,但是能详细的说明了控件的使用,对许多刚涉足DELPHI的朋友会很有帮助的

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, DB, DBTables, StdCtrls, ExtCtrls;

type
  TForm1 = class(TForm)
    Panel1: TPanel;
    GroupBox1: TGroupBox;
    Label1: TLabel;
    Label2: TLabel;
    Label3: TLabel;
    Label4: TLabel;
    Label5: TLabel;
    Image1: TImage;
    Edit1: TEdit;
    Edit2: TEdit;
    Edit3: TEdit;
    Edit4: TEdit;
    Button1: TButton;
    Button2: TButton;
    Button3: TButton;
    Button4: TButton;
    Button5: TButton;
    Query1: TQuery;
    procedure Button1Click(Sender: TObject);
    procedure FormCreate(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure Button3Click(Sender: TObject);
    procedure Button4Click(Sender: TObject);
  private
    procedure cx;
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}
procedure TForm1.cx;
var B:TBitmap;
begin
    B:= TBitmap.Create;
  try
    B.Assign(query1.fieldbyname('BMP'));
    Image1.Picture.Bitmap.Assign(B);
  finally
    B.Free;
  end;
   edit1.Text:=query1.fieldbyname('name').AsString;
   edit2.Text:=query1.fieldbyname('size').AsString;
   edit3.Text:=query1.fieldbyname('weight').AsString;
   edit4.Text:=query1.fieldbyname('area').AsString;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
   if not query1.Bof then
      begin
       query1.Prior;
       cx;
      end
   else
      showmessage('已经是第一条记录');
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
   cx;
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
   if not query1.Eof then
      begin
       query1.Next;
       cx;
      end
   else
      showmessage('已经是最后一条记录');
end;

procedure TForm1.Button3Click(Sender: TObject);
begin
   query1.First;
   cx;
end;

procedure TForm1.Button4Click(Sender: TObject);
begin
   query1.Last;
   cx;
end;

end.