谁能帮忙写个最简单的全局钩子的例子啊

Question

如题.!目的是想让钩子获取活动窗口句柄和标题.!
谁能给个最简单的例子.谢谢了

Answer 1

unit UnitHookDLL;interfaceuses Windows, Messages, Dialogs, SysUtils,UnitHookConst;
var
  hMappingFile : THandle;
  pShMem : PShareMem;
  FirstProcess : boolean;
  NextHook: HHook;  function StartHook(sender : HWND;MessageID : WORD) : BOOL; stdcall;
  function StopHook: BOOL; stdcall;
  procedure GetRbutton; stdcall;implementationprocedure GetRbutton; stdcall;
begin
   pShMem^.IfRbutton:=true;
end;function HookHandler(iCode: Integer; wParam: WPARAM; lParam: LPARAM): LRESULT; stdcall; export;
begin
  Result := 0;
  If iCode < 0 Then Result := CallNextHookEx(NextHook, iCode, wParam, lParam);  case wparam of
  WM_LBUTTONDOWN:
    begin
    end;
  WM_LBUTTONUP:
    begin
    end;
  WM_LBUTTONDBLCLK:
    begin
    end;
  WM_RBUTTONDOWN:
    begin
      if pShMem^.IfRbutton then
      begin
         pShMem^.IfRbutton := false;
         pShMem^.data2:=pMOUSEHOOKSTRUCT(lparam)^;
         getwindowtext(pShMem^.data2.hwnd,pShMem^.buffer,1024);
         SendMessage(pShMem^.data1[1],pShMem^.data1[2]+1,wParam,integer(@(pShMem^.data2)) );
         //             窗口                   消息                        坐标
      end;
    end;
  WM_RBUTTONUP:
    begin
    end;
  WM_RBUTTONDBLCLK:
    begin
    end;
  WM_MBUTTONDOWN:
    begin
    end;
  WM_MBUTTONUP:
    begin
    end;
  WM_MBUTTONDBLCLK:
    begin
    end;
  WM_NCMouseMove, WM_MOUSEMOVE:
    begin
      pShMem^.data2:=pMOUSEHOOKSTRUCT(lparam)^;
      getwindowtext(pShMem^.data2.hwnd,pShMem^.buffer,1024);
      SendMessage(pShMem^.data1[1],pShMem^.data1[2],wParam,integer(@(pShMem^.data2)) );
      //             窗口                   消息                        坐标
    end;
  end;
end;function StartHook(sender : HWND;MessageID : WORD) : BOOL;
  function GetModuleHandleFromInstance: THandle;
  var
    s: array[0..512] of char;
  begin
    GetModuleFileName(hInstance, s, sizeof(s)-1);
    Result := GetModuleHandle(s);
  end;
begin
  Result := False;
  if NextHook <> 0 then Exit;
  pShMem^.data1[1]:=sender;
  pShMem^.data1[2]:=messageid;
  NextHook :=
     SetWindowsHookEx(WH_mouse, HookHandler, HInstance, 0);  //全局
     //SetWindowsHookEx(WH_mouse, HookHandler, GetModuleHandleFromInstance, GetCurrentThreadID); //实例
  Result := NextHook <> 0;
end;function StopHook: BOOL;
begin
  if NextHook <> 0 then
  begin
    UnhookWindowshookEx(NextHook);
    NextHook := 0;
    //SendMessage(HWND_BROADCAST,WM_SETTINGCHANGE,0,0);
  end;
  Result := NextHook = 0;
end;initialization
        hMappingFile := OpenFileMapping(FILE_MAP_WRITE,False,MappingFileName);
        if hMappingFile=0 then
        begin
           hMappingFile := CreateFileMapping($FFFFFFFF,nil,PAGE_READWRITE,0,SizeOf(TShareMem),MappingFileName);
           FirstProcess:=true;
        end
        else FirstProcess:=false;
        if hMappingFile=0 then Exception.Create('不能建立共享内存!');        pShMem :=  MapViewOfFile(hMappingFile,FILE_MAP_WRITE or FILE_MAP_READ,0,0,0);
        if pShMem = nil then
        begin
           CloseHandle(hMappingFile);
           Exception.Create('不能映射共享内存!');
        end;
        if FirstProcess then
        begin
           pShmem^.IfRbutton := false;
        end;
        NextHook:=0;
finalization
        UnMapViewOfFile(pShMem);
        CloseHandle(hMappingFile);end.

Answer 2

上面是DLL代码，下面是调用的主窗体unit Unitmain;interfaceuses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  StdCtrls, ExtCtrls,UnitHookConst;type
  TForm1 = class(TForm)
    capture: TButton;
    Panel1: TPanel;
    Edit1: TEdit;
    Edit2: TEdit;
    Edit3: TEdit;
    Label1: TLabel;
    Edit4: TEdit;
    Edit5: TEdit;
    Edit6: TEdit;
    Button1: TButton;
    procedure captureClick(Sender: TObject);
    procedure FormClose(Sender: TObject; var Action: TCloseAction);
    procedure Button1Click(Sender: TObject);
    procedure FormCreate(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  procedure WndProc(var Messages: TMessage); override;
end;var
  Form1: TForm1;
  hMappingFile : THandle;
  pShMem : PShareMem;
const MessageID = WM_User + 100;implementation  {$R *.DFM}
  function StartHook(sender : HWND;MessageID : WORD) : BOOL;stdcall; external 'DllMouse.DLL';
  function StopHook: BOOL;stdcall; external 'DllMouse.DLL';
  procedure GetRbutton; stdcall; external 'DllMouse.DLL';procedure TForm1.captureClick(Sender: TObject);
begin
  if capture.caption='开始' then
  begin
     if StartHook(Form1.Handle,MessageID) then
       capture.caption:='停止';
  end
  else begin
    if StopHook then
       capture.caption:='开始';
  end;
end;procedure TForm1.WndProc(var Messages: TMessage);
var
   x,y:integer;
   s:array[0..255]of char;
begin
   if pShMem = nil then
   begin
        hMappingFile := OpenFileMapping(FILE_MAP_WRITE,False,MappingFileName);
        if hMappingFile=0 then Exception.Create('不能建立共享内存!');
        pShMem :=  MapViewOfFile(hMappingFile,FILE_MAP_WRITE or FILE_MAP_READ,0,0,0);
        if pShMem = nil then
        begin
           CloseHandle(hMappingFile);
           Exception.Create('不能映射共享内存!');
        end;
   end;
   if pShMem = nil then exit;   
  if Messages.Msg = MessageID then
  begin
    x:=pShMem^.data2.pt.x;
    y:=pShMem^.data2.pt.y;
    edit3.text:='HWND:'+inttostr(pShMem^.data2.hwnd);
    panel1.caption:='x='+inttostr(x)+' y='+inttostr(y);
    edit2.text:='WindowsText:'+string(pShMem^.buffer);
    getClassName(pShMem^.data2.hwnd,s,255);
    edit1.text:='ClassName:"'+string(s)+'"';
  end
  else if Messages.Msg = MessageID+1 then
  begin
    edit4.text:=inttostr(pShMem^.data2.hwnd);
    edit5.text:='WindowsText:'+string(pShMem^.buffer);
    getClassName(pShMem^.data2.hwnd,s,255);
    edit6.text:='ClassName:"'+string(s)+'"';
  end
  else Inherited;
end;procedure TForm1.FormClose(Sender: TObject; var Action: TCloseAction);
begin
  if capture.caption='开始' then
  begin
  end
  else begin
    if StopHook then
       capture.caption:='开始';
  end;
end;procedure TForm1.Button1Click(Sender: TObject);
begin
   if capture.caption<>'开始' then
   begin
      edit4.text:='';
      edit5.text:='';
      edit6.text:='';
      GetRbutton;
   end;
end;procedure TForm1.FormCreate(Sender: TObject);
begin
   pShMem := nil;
end;end.

Answer 3

如果只想获取当前活动窗口的句柄和标题，
那不用钩子也可以啊。得到当前活动窗体标题：
function  GetActiveWindowText: string;
var
  hnd: HWND;
  stlen: Integer;
begin
  hnd := GetForegroundWindow;
  stlen := GetWindowTextLength(hnd);
  SetLength(Result, stlen);
  GetWindowText(hnd, PChar(Result), stlen+1);
end;这个函数返回值就是标题，
hnd是窗体句柄。

Answer 4

为什么不搜一下呢? 网上一大堆http://wecan.name/diary/index.php?job=art&articleid=a_20071204_000345http://www.computernews.com.cn/Article/2004-10-13/4006.htmlhttp://hi.baidu.com/wh445306/blog/item/a4a228a4171f08f39152ee4d.html