使 SaveDialog 对话框的文件名选择变灰 - 回复 "delphan" 的问题

问题来源: http://www.cnblogs.com/del/archive/2009/03/18/1410030.html#1480550

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本例效果图:

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代码文件:

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unit Unit1;



interface



uses

  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,

  Dialogs, StdCtrls;



type

  TForm1 = class(TForm)

    Button1: TButton;

    SaveDialog1: TSaveDialog;

    procedure Button1Click(Sender: TObject);

    procedure SaveDialog1SelectionChange(Sender: TObject);

  end;



var

  Form1: TForm1;



implementation



{$R *.dfm}



const

  FileName = 'ABC.txt';



{变灰并维持指定的文件名}

procedure EnableFileName(h: HWND; name: string);

var

  hc: HWND;

  buf: array[Byte] of Char;

begin

  h := GetWindow(h, GW_HWNDFIRST);

  while h <> 0 do

  begin

    if GetParent(h) = Form1.Handle then

    begin

      hc := GetWindow(h, GW_CHILD);

      while hc <> 0 do

      begin

        GetClassName(hc, buf, SizeOf(buf));

        if buf = 'ComboBoxEx32' then

        begin

          EnableWindow(hc, False);

          SetWindowText(hc, name);

          Exit;

        end;

        hc := GetWindow(hc, GW_HWNDNEXT);

      end;

    end;

    h := GetWindow(h, GW_HWNDNEXT);

  end;

end;



{其实变灰只是假象, 使用时还需要调整下}

procedure TForm1.Button1Click(Sender: TObject);

var

  path: string;

begin

  SaveDialog1.FileName := FileName;

  SaveDialog1.OptionsEx := [ofExNoPlacesBar];

  if SaveDialog1.Execute(Handle) then {注意这里 Execute 参数是当前窗口的句柄}

  begin

    path := SaveDialog1.FileName;

    path := ExtractFilePath(path) + FileName;

    ShowMessage(path);

  end;

end;



{在 SaveDialog 的 OnSelectionChange 事件中调用上面的自定义过程 EnableFileName}

procedure TForm1.SaveDialog1SelectionChange(Sender: TObject);

begin

  EnableFileName(Handle, FileName);

end;



end.


 
   

窗体文件:

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object Form1: TForm1

  Left = 0

  Top = 0

  Caption = 'Form1'

  ClientHeight = 129

  ClientWidth = 225

  Color = clBtnFace

  Font.Charset = DEFAULT_CHARSET

  Font.Color = clWindowText

  Font.Height = -11

  Font.Name = 'Tahoma'

  Font.Style = []

  OldCreateOrder = False

  PixelsPerInch = 96

  TextHeight = 13

  object Button1: TButton

    Left = 128

    Top = 83

    Width = 75

    Height = 25

    Caption = 'Button1'

    TabOrder = 0

    OnClick = Button1Click

  end

  object SaveDialog1: TSaveDialog

    OnSelectionChange = SaveDialog1SelectionChange

    Left = 24

    Top = 16

  end

end