开发所用delphi版本是xe2，效果图如下：
代码如下：
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unit Unit1;
interfaceuses Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Vcl.ExtCtrls;
type TForm1 = class(TForm)
Panel1: TPanel;
Button1: TButton;
Edit1: TEdit;
Memo1: TMemo;
Button2: TButton;
procedure Button1Click(Sender: TObject);
procedure Button2Click(Sender: TObject);
private
{ Private declarations }
function getmaxval(myarray: array of Integer):Integer;
public
{ Public declarations }
end;
var Form1: TForm1;
implementation{$R *.dfm}var rec: Integer = 0;
procedure TForm1.Button1Click(Sender: TObject);
var i,j,m,n,p:Integer;
edt: TEdit;
arr: array of Integer;
begin Inc(rec); //按钮点击次数
m := 0;
n := 0;
p := 0;
Memo1.Clear;
for i := 0 to Panel1.ControlCount - 1 do
begin
if Panel1.Controls[i] is TEdit then
inc(m); //记录edit个数
end;
SetLength(arr,m);
Memo1.Lines.Add(‘创建组件前的记录:‘ + #13#10 + ‘--------------------------‘);
Memo1.Lines.Add(‘Edit组件个数:‘ + IntToStr(m) + #13#10 + ‘--------------------------‘);
for j := 0 to Panel1.ControlCount - 1 do
begin
if Panel1.Controls[j] is TEdit then
begin
if n <= m then
begin
arr[n] := TEdit(Panel1.Controls[j]).Top;
Memo1.Lines.Add(‘Edit‘ + IntToStr(n + 1) + ‘的Top值:‘ + IntToStr(arr[n]));
Inc(n);
end else Break;
end;
end;
p := getmaxval(arr); //记录panel里最下面的edit的top值
Memo1.Lines.Add(‘最大Top值:‘ + inttostr(p));
//动态创建Edit
//TEdit.Create()，参数是一个AOwner: TComponent，只要是窗体上的组件都可以，
//但必须要在创建后重新指明父组件的名称，否则没法显示
edt := TEdit.Create(Panel1); //指明了owner，可以不释放内存，窗口关闭时由父组件销毁
edt.Parent := Panel1;
edt.Left := Edit1.Left;
edt.Top := p + Edit1.Height + 3;
edt.Width := Edit1.Width;
edt.Height := Edit1.Height;
edt.Text := ‘Edit‘ + IntToStr(rec + 1);
edt.Show;
end;
procedure TForm1.Button2Click(Sender: TObject); //释放内存，并初始化
var i,j,m:Integer;
edts: array of TEdit;
begin j := 0; //数组edts的键[key]
SetLength(edts,rec + 1); //button1次数 + 原有的edit1
for i := 0 to Panel1.ControlCount - 1 do
begin
if Panel1.Controls[i] is TEdit then
begin
edts[j] := TEdit(Panel1.Controls[i]);
Inc(j);
end;
end;
for m := Length(edts) downto 1 do //edit1不释放，注意此处的downto，根据栈后进先出原则，否则会报错
begin
try
edts[m].Free;
rec := 0;
Memo1.Clear;
except
//ShowMessage(‘释放动态创建组件的内存失败！‘);
end;
end;
end;
function TForm1.getmaxval(myarray: array of Integer):Integer; //遍历数组取得最大值
var i,max:Integer;
begin max := myarray[0];
for i := 1 to Length(myarray) - 1 do
begin
if myarray[i] >= max then
max := myarray[i];
end;
Result := max;
end;
end.
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