用Delphi编程实现清空回收站功能

2019-12-05 08:16:59 来源: 虹口信息港

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:

constSHERB_NOCONFIRMATION = $00000001 ;SHERB_NOPROGRESSUI = $00000002 ;SHERB_NOSOUND = $00000004 ;typeTSHEmptyRecycleBin=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。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 beginMessageDlg(’Failed to load Shell32.dll.’, mtError, [mbOK], 0);Exit ; end ; if @SHEmptyRecycleBin <> nil then beginSHEmptyRecycleBin(Application.Handle,’’,SHERB_NOCONFIRMATION orSHERB_NOPROGRESSUI or SHERB_NOSOUND) ; end; FreeLibrary(LibHandle); @SHEmptyRecycleBin := nil ;end; 程序代码如下:unit Unit1;interfaceusesWindows, 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; implementationconst 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 beginMessageDlg(’Failed to load Shell32.dll.’, mtError, [mbOK], 0);Exit ; end ; if @SHEmptyRecycleBin <> nil then beginSHEmptyRecycleBin(Application.Handle,’’, SHERB_NOCONFIRMATION or SHERB_NOPROGRESSUI or SHERB_NOSOUND) ; end; FreeLibrary(LibHandle); @SHEmptyRecycleBin := nil ; end;end.

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