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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。设计完成的主界面如图1所示。
图1 主界面 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;interfaceuses 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; 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 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. 保存文件,然后按F9键运行程序,程序运行的初始画面如图2所示。
图2 程序运行的初始画面 单击“清空回收站”按钮就会将操作系统回收站中的文件彻底删除。 本程序同时也演示了如何调用一个.dll文件中的函数。
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。设计完成的主界面如图1所示。
图1 主界面 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;interfaceuses 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; 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 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. 保存文件,然后按F9键运行程序,程序运行的初始画面如图2所示。
图2 程序运行的初始画面 单击“清空回收站”按钮就会将操作系统回收站中的文件彻底删除。 本程序同时也演示了如何调用一个.dll文件中的函数。
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