用Delphi编程实现清空回收站功能

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用Delphi编程实现清空回收站功能

来源: 作者: 时间:2016-02-05 11:47 【

本程序演示如何通过程序来清空回收站。 向窗体上添加一个TButton组件,它用于激活清空回收站的操作。 首先在程序的implementation段中定义3个常数和一个类型声明,代码如下:

本程序演示如何通过程序来清空回收站。

向窗体上添加一个TButton,它用于激活清空回收站的操作。

首先在程序的implementation段中定义3个常数和一个类型声明,代码如下:

 

const
            SHERB_NOCONFIRMATION = $00000001 ;
            SHERB_NOPROGRESSUI = $00000002 ;
            SHERB_NOSOUND = $00000004 ;
            type
            TSHEmptyRecycleBin=
            function(Wnd:HWND;LPCTSTR:PChar;DWORD:Word):Integer;stdcall;

程序运行初期,程序首先会通过LoadLibrary函数加载动态链接库Shell32.dll,并且把加载后的操作句柄存储在LibHandle中。然后通[email protected]:=GetProcAddress (LibHandle, ’SHEmptyRecycleBinA’)语句读取SHEmptyRecycleBinA函数的地址,如果以上语句能够正确执行([email protected]),[email protected]最后释放动态链接库。响应代码如下:

 

procedure TForm1.Button1Click(Sender: TObject);
            var
             SHEmptyRecycleBin:TSHEmptyRecycleBin;
             LibHandle:THandle;
            begin
             LibHandle := LoadLibrary(PChar(’Shell32.dll’)) ;
             if LibHandle <> 0 then
             begin
            [email protected] := GetProcAddress(LibHandle, ’SHEmptyRecycleBinA’);
             end
             else
             begin
              MessageDlg(’Failed to load Shell32.dll.’, mtError, [mbOK], 0);
              Exit ;
             end ;
             if @SHEmptyRecycleBin <> nil then
             begin
              SHEmptyRecycleBin(Application.Handle,’’,SHERB_NOCONFIRMATION or
            SHERB_NOPROGRESSUI or SHERB_NOSOUND) ;
             end;
             FreeLibrary(LibHandle);
            [email protected] := nil ;
            end;
            程序代码如下:
            unit Unit1;
            interface
            uses
            Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
            Dialogs, StdCtrls;
            type
             TForm1 = class(TForm)
             Button1: TButton;
             procedure Button1Click(Sender: TObject);
            private
             { Private declarations }
            public
             { Public declarations }
            end;
            var
             Form1: TForm1;
             implementation
            const
             SHERB_NOCONFIRMATION = $00000001 ;
             SHERB_NOPROGRESSUI = $00000002 ;
             SHERB_NOSOUND = $00000004 ;
            type
             TSHEmptyRecycleBin=function(Wnd:HWND;LPCTSTR:PChar;DWORD:Word):Integer;stdcall;
             {$R *.dfm}
             procedure TForm1.Button1Click(Sender: TObject);
            var
             SHEmptyRecycleBin:TSHEmptyRecycleBin;
             LibHandle:THandle;
            begin
             LibHandle := LoadLibrary(PChar(’Shell32.dll’)) ;
             if LibHandle <> 0 then
             begin
            [email protected] := GetProcAddress(LibHandle, ’SHEmptyRecycleBinA’);
             end
             else
             begin
              MessageDlg(’Failed to load Shell32.dll.’, mtError, [mbOK], 0);
              Exit ;
             end ;
             if @SHEmptyRecycleBin <> nil then
             begin
              SHEmptyRecycleBin(Application.Handle,’’,SHERB_NOCONFIRMATION or SHERB_NOPROGRESSUI or SHERB_NOSOUND) ;
             end;
             FreeLibrary(LibHandle);
            [email protected] := nil ;
             end;
            end.
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