Lazarus - SelectFirst 给出错误

Posted 2023-03-08

【中文标题】Lazarus - SelectFirst 给出错误

【英文标题】：Lazarus - SelectFirst Gives Error

【发布时间】：2013-06-05 11:58:25

【问题描述】：

我正在尝试制作一个组合框，在更改后选择第一个项目。我的操作系统是 Ubuntu 12.04。我的代码：

unit Unit1; 

$mode objfpc$H+

interface

uses
  Classes, SysUtils, FileUtil, Forms, Controls, Graphics, Dialogs, StdCtrls,
  Buttons, Menus;

type

   TForm1 

  TForm1 = class(TForm)
    ComboBox1: TComboBox;
    Edit1: TEdit;
    Label1: TLabel;
    Memo1: TMemo;
    procedure ComboBox1Change(Sender: TObject);
    procedure FormCreate(Sender: TObject);
  private
     private declarations 
  public
     public declarations 
  end; 

var
  Form1: TForm1; 

implementation

$R *.lfm

 TForm1 

procedure TForm1.ComboBox1Change(Sender: TObject);
var Text2:String;
begin
  if (Combobox1.ItemIndex = 1) Then
  begin
    Text2 := Memo1.SelText;
    Edit1.Text := Memo1.SelText;
    Memo1.SelText := '[artist]' + Text2 + '[/artist]';
  end;
  if (Combobox1.ItemIndex = 2) Then
  begin
  if (Edit1.Text = '') Then
    ShowMessage('Artist name is not defined') Else
    begin
      Text2 := Memo1.SelText;
      Memo1.SelText := '[album artist=' + Edit1.Text + ']' + Text2 + '[/album]';
    end;
  end;
  if (ComboBox1.ItemIndex = 3) Then
  begin
  if (Edit1.Text = '') Then
    ShowMessage('Artist name is not defined') Else
    begin
      Text2 := Memo1.SelText;
      Memo1.SelText := '[track artist=' + Edit1.Text + ']' + Text2 + '[/track]'
    end;
  end;
  if (ComboBox1.ItemIndex = 4) Then
  begin
    Text2 := Memo1.SelText;
    Memo1.SelText := '[label]' + Text2 + '[/label]';
  end;
  if (ComboBox1.ItemIndex = 5) Then
  begin
    Text2 := Memo1.SelText;
    Memo1.SelText := '[tag]' + Text2 + '[/tag]';
  end;
  Combobox1.SelectFirst;
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
  Memo1.Text := 'Select an item';
end;

end.

这给出了一个错误：unit1.pas(74,13) 错误：标识符 idents no member "SelectFirst"

我该如何解决这个问题？

【参考方案1】：

组合框没有这个程序 如果你想要第一个项目以这种方式选择它

ComboBox1.ItemIndex := 0