用Delphi编程实现清空回收站功能

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：

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。然后通过@SHEmptyRecycleBin:=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(也就是@SHEmptyRecycleBin不等于nil)，那么就调用SHEmptyRecycleBin完成清空回收站的操作。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
            　　@SHEmptyRecycleBin := 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);
            　@SHEmptyRecycleBin := nil ;
            end;
            程序代码如下：
            unit Unit1;
            inte易做图ce
            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
            　　@SHEmptyRecycleBin := 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);
            　@SHEmptyRecycleBin := nil ;
            　end;
            end.

补充：软件开发 , Delphi ,