分数用完了,只好重新申请个名字,请问一个小问题,MDI中当主窗口创建一个子窗口的时候,如何给子窗口类中自定义的一个数据赋值?

Question

Child.filepath:=Name; //将打开的文件名赋予打开的子窗口,因为后面经常要用
Child := TMDIChild.Create(Application);  还没建立就赋值怎么能对呢? 

Answer 1

Child.filepath:=Name; 
应该在Create后吧！？  

Answer 2

事实上我连 self.Capition也出不来,
太奇怪了

Answer 3

我是在Loaded下面
showmessage(self.filepath);
showmessage(self.Captition);

Answer 4

谁知道?
怎么现在 CSDN多了那么多规矩,连自己回帖都不能大于三次

Answer 5

1、先Create，再赋值。
2、Loaded下面当然出不来，在onshow的地方显示就可以了。

Answer 6

Loaded不出来那怎么办啊,
我的DBGird还要根据它来显示数据库呢
再说我在ChildForm添加个按钮,结果按钮按下时候我也得不到

Answer 7

我觉得 首先应该 把 filepath 写成 child 的属性，
   按钮是怎么回事啊？？

Answer 8

我用的没有问题啊！我是在
  Child := TMDIChild.Create(Application);
之后使用
Child.filepath:=Name; //将打开的文件名赋予打开的子窗口,因为后面经常要用
的，然后在childwin的click事件里showmessage(self.filepath);
的。  

Answer 9

filepath 写成 child 的属性是什么意思?
我的filepath是string

Answer 10

//我试过没有问题
interfaceuses Windows, Classes, Graphics, dialogs,Forms, Controls, StdCtrls, ExtCtrls;type
  TMDIChild = class(TForm)
    Memo1: TMemo;
    Panel1: TPanel;
    Button1: TButton;    procedure FormClose(Sender: TObject; var Action: TCloseAction);
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    filepath:String;
  end;implementation{$R *.DFM}procedure TMDIChild.FormClose(Sender: TObject; var Action: TCloseAction);
begin
  Action := caFree;
end;procedure TMDIChild.Button1Click(Sender: TObject);
begin
showmessage(self.filepath);
end;end.
unit Main;interfaceuses Windows, SysUtils, Classes, Graphics, Forms, Controls, Menus,
  StdCtrls, Dialogs, Buttons, Messages, ExtCtrls, ComCtrls, StdActns,
  ActnList, ToolWin, ImgList;type
  TMainForm = class(TForm)
    MainMenu1: TMainMenu;
    File1: TMenuItem;
    FileNewItem: TMenuItem;
    FileOpenItem: TMenuItem;
    FileCloseItem: TMenuItem;
    Window1: TMenuItem;
    Help1: TMenuItem;
    N1: TMenuItem;
    FileExitItem: TMenuItem;
    WindowCascadeItem: TMenuItem;
    WindowTileItem: TMenuItem;
    WindowArrangeItem: TMenuItem;
    HelpAboutItem: TMenuItem;
    OpenDialog: TOpenDialog;
    FileSaveItem: TMenuItem;
    FileSaveAsItem: TMenuItem;
    Edit1: TMenuItem;
    CutItem: TMenuItem;
    CopyItem: TMenuItem;
    PasteItem: TMenuItem;
    WindowMinimizeItem: TMenuItem;
    StatusBar: TStatusBar;
    ActionList1: TActionList;
    EditCut1: TEditCut;
    EditCopy1: TEditCopy;
    EditPaste1: TEditPaste;
    FileNew1: TAction;
    FileSave1: TAction;
    FileExit1: TAction;
    FileOpen1: TAction;
    FileSaveAs1: TAction;
    WindowCascade1: TWindowCascade;
    WindowTileHorizontal1: TWindowTileHorizontal;
    WindowArrangeAll1: TWindowArrange;
    WindowMinimizeAll1: TWindowMinimizeAll;
    HelpAbout1: TAction;
    FileClose1: TWindowClose;
    WindowTileVertical1: TWindowTileVertical;
    WindowTileItem2: TMenuItem;
    ToolBar2: TToolBar;
    ToolButton1: TToolButton;
    ToolButton2: TToolButton;
    ToolButton3: TToolButton;
    ToolButton4: TToolButton;
    ToolButton5: TToolButton;
    ToolButton6: TToolButton;
    ToolButton9: TToolButton;
    ToolButton7: TToolButton;
    ToolButton8: TToolButton;
    ToolButton10: TToolButton;
    ToolButton11: TToolButton;
    ImageList1: TImageList;
    procedure FileNew1Execute(Sender: TObject);
    procedure FileOpen1Execute(Sender: TObject);
    procedure HelpAbout1Execute(Sender: TObject);
    procedure FileExit1Execute(Sender: TObject);
  private
    { Private declarations }
    procedure CreateMDIChild(const Name: string);
  public
    { Public declarations }
  end;var
  MainForm: TMainForm;implementation{$R *.DFM}uses ChildWin, About;procedure TMainForm.CreateMDIChild(const Name: string);
var
  Child: TMDIChild;
begin
  { create a new MDI child window }
  Child := TMDIChild.Create(Application);
  Child.Caption := Name;
  Child.filepath:=name;
  if FileExists(Name) then Child.Memo1.Lines.LoadFromFile(Name);
end;procedure TMainForm.FileNew1Execute(Sender: TObject);
begin
  CreateMDIChild('NONAME' + IntToStr(MDIChildCount + 1));
end;procedure TMainForm.FileOpen1Execute(Sender: TObject);
begin
  if OpenDialog.Execute then
    CreateMDIChild(OpenDialog.FileName);
end;procedure TMainForm.HelpAbout1Execute(Sender: TObject);
begin
  AboutBox.ShowModal;
end;procedure TMainForm.FileExit1Execute(Sender: TObject);
begin
  Close;
end;end.