屏蔽键盘的钩子

时间:2010-02-05 17:12:30  来源:第二电脑网  作者:第二电脑网

  第二电脑网导读:indow(h,SW_hide)来隐藏任务条,但是不能屏蔽开始菜单,通过键盘的win功能键还是可以打开开始菜单,所以配合键盘钩子,来屏蔽开始菜单。library HIDE;{ Imp...
  正文: 在一些碰到过的多媒体软件编制过程中通常需要彻底屏蔽任务条,通常的办法是调用
ShowWindow(h,SW_hide)
来隐藏任务条,但是不能屏蔽开始菜单,通过键盘的win功能键还是可以打开开始菜单,所以配合键盘钩子,来屏蔽开始菜单。


library HIDE;

{ Important note about DLL memory management: ShareMem must be the
   first unit in your library's USES clause AND your project's (select
   Project-View Source) USES clause if your DLL exports any procedures or
   functions that pass strings as parameters or function results. This
   applies to all strings passed to and from your DLL--even those that
   are nested in records and classes. ShareMem is the interface unit to
   the BORLNDMM.DLL shared memory manager, which must be deployed along
   with your DLL. To avoid using BORLNDMM.DLL, pass string information
   using PChar or ShortString parameters. }


uses
SysUtils,
Classes,
Windows,
messages;

var
hHk :HHOOK;
type
PKBDLLHOOKSTRUCT = ^KBDLLHOOKSTRUCT;
KBDLLHOOKSTRUCT = record
vkCode: Dword;
ScanCode: DWORD;
Flags: DWORD;
Time: DWORD;
dwExtraInfo: DWORD;
end;
{$R *.res}
function ycxsks( yc:Boolean): Boolean;stdcall; //隐藏-显示任务条
var
h:THandle;
begin
  if yc = True then
  begin
    h:=FindWindow('Shell_TrayWnd',nil);
    ShowWindow(h,SW_hide); //隐藏任务条
   end
  else
  begin
    h:=FindWindow('Shell_TrayWnd',nil);
    ShowWindow(h,SW_SHOW); //显示任务条
   end;
  Result:=true;
end;

function keyHookProc(nCode: Integer;WParam: WPARAM;LParam: LPARAM): LRESULT;stdcall;
//调用键盘钩子,屏蔽左右win功能键
var
p: PKBDLLHOOKSTRUCT;
y: integer;
begin
  if nCode<0 then
  Result:= CallNextHookEx(hHk,nCode,WParam,LParam)
  else
  begin
    y := 0;
    case WParam of
    WM_KEYDOWN,WM_SYSKEYDOWN: //按键后判断所按键
       begin
      p:=PKBDLLHOOKSTRUCT(Lparam);
      if p^.vkCode = VK_LWIN then
      y := 1;
      if p^.vkCode = VK_RWIN then
      y := 1;
    end;
    WM_KEYUP,WM_SYSKEYUP: //松开按键后判断所按键
       begin
      p:=PKBDLLHOOKSTRUCT(Lparam);
      if p^.vkCode = VK_LWIN then
      y := 1;
      if p^.vkCode = VK_RWIN then
      y := 1;
    end;
  end;
  if y=1 then
  Result:=1 //如果为WIN功能键则屏蔽
     else
  Result:= CallNextHookEx(hHk,nCode,WParam,LParam); //其他键放下一个钩子
   end
end;

function Enablehide:Boolean;stdcall;export; //外部调用
begin
  if hHk = 0 then
  begin
    hHk := SetWindowsHookEx(13,@keyHookProc,HInstance,0);
    Result := True;
  end
  else
  Result := False;
  ycxsks(true);
end;
屏蔽键盘的钩子》由第二电脑网原创提供,转载请注明:http://www.002pc.com/master/College/Language/Delphi/12792.html


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