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| 关键词： nbsp hMappingFile pShMem 钩子 end 内存 句柄 NextHook begin 消息 |
上次简单介绍了获取星号密码的几个函数，但是在实际应用中，要通过本程序获取其他程序的的信息，而其他程序可能是VC编写，也可能是Delphi或者VB编写，因此不能像以前那样简单的获取edit11.handle取得密码框的句柄了。那么怎么办了，常见的方法就是通过鼠标钩子获取鼠标所在控件的句柄，再取其内容。下面就来制作一个完整的星号密码查看器，原理就是钩子，还是钩子！ 首先，写一个dll和应用程序共用的单元，命名为HookConst（个人随便），这里面声明一个内存共享的结构，dll和应用程序都得用到，当然你不怕麻烦也可以在dll和exe中都声明，其内容如下，做了注释， unit HookConst; interface uses windows;const MappingFileName='_MyDllMouse'; //内存共享区的名称标识，dll和主程序里都得相同 type TShareMem=record data1:array [1..2] of DWORD; //data1[1]存放的程序handle，data1[2]存放的是消息 data2:TMOUSEHOOKSTRUCT; //鼠标结构 buffer:array[0..1024]of char; //缓冲区 end; PShareMem=^TShareMem; implementation end.//简单介绍下 TMOUSEHOOKSTRUCT 结构{ TMouseHookStruct = packed record pt:Tpoint; hwnd:HWND; wHitTestCode:UINT; dwExtraInfo:DWORD; end; 其中 pt 包含鼠标的x，y坐标，hwnd 指定接收鼠标消息的窗口，wHitTestCode指定鼠标所在窗口区域 dwExtraInfo是附加信息 } 好了，下一步准备dll的代码，在其uses里加上HookConst，dll代码见下： unit HookDll; interface uses Windows, Messages, Dialogs, SysUtils,HookConst; var hMappingFile : THandle; pShMem : PShareMem; FirstProcess : boolean; NextHook: HHook; function StartHook(sender : HWND;MessageID : WORD) : BOOL; stdcall; function StopHook: BOOL; stdcall;implementation//钩子回调函数function HookHandler(iCode: Integer; wParam: WPARAM; lParam: LPARAM): LRESULT; stdcall; export;begin Result := 0; If iCode < 0 Then Result := CallNextHookEx(NextHook, iCode, wParam, lParam);//以下是处理鼠标事件，这里我只处理鼠标移动事件，如果愿意，自行添加其他事件 case wparam of WM_LBUTTONDOWN: begin end; WM_LBUTTONUP: begin end; WM_LBUTTONDBLCLK: begin end; WM_RBUTTONDOWN: begin 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: //鼠标移动事件 begin pShMem^.data2:=pMOUSEHOOKSTRUCT(lparam)^; getwindowtext(pShMem^.data2.hwnd,pShMem^.buffer,1024); //取其内容 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;begin Result := False; if NextHook <> 0 then Exit; pShMem^.data1[1]:=sender; //主程序窗口句柄 pShMem^.data1[2]:=messageid; //消息 NextHook := SetWindowsHookEx(WH_mouse, HookHandler, HInstance, 0); //全局挂在WH_mouse上，钩子处理函数HookHandler Result := NextHook <> 0;end; function StopHook: BOOL;begin if NextHook <> 0 then begin UnhookWindowshookEx(NextHook); NextHook := 0; end; Result := NextHook = 0;end;initialization hMappingFile := OpenFileMapping(FILE_MAP_WRITE,False,MappingFileName); if hMappingFile=0 then begin //打开共享内存，如果不存在，则创建 hMappingFile := CreateFileMapping($FFFFFFFF,nil,PAGE_READWRITE,0,SizeOf(TShareMem),MappingFileName); FirstProcess:=true; end else FirstProcess:=false; if hMappingFile=0 then Exception.Create('不能建立共享内存!'); pShMem := MapViewOfFile(hMappingFile,FILE_MAP_WRITE or FILE_MAP_READ,0,0,0); if pShMem = nil then begin CloseHandle(hMappingFile); Exception.Create('不能映射共享内存!'); end; NextHook:=0;finalization UnMapViewOfFile(pShMem); CloseHandle(hMappingFile); end. dll工程文件 library DllMouse; uses SysUtils, Windows, UnitHookDLL in 'UnitHookDLL.pas', UnitHookConst in 'UnitHookConst.pas'; exports StartHook,StopHook; beginend. 下来是exe的， unit main; interface uses Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, Dialogs,HookConst,ExtCtrls,StdCtrls; type TForm1 = class(TForm) Panel1: TPanel; Edit1: TEdit; Edit2: TEdit; Edit3: TEdit; Label1: TLabel; Label2: TLabel; Label3: TLabel; Label4: TLabel; procedure FormCreate(Sender: TObject); procedure FormClose(Sender: TObject; var Action: TCloseAction); private { Private declarations } public { Public declarations } procedure WndProc(var Messages: TMessage); override; end; var Form1: TForm1; hMappingFile : THandle; pShMem : PShareMem;const MessageID = WM_User + 100; //用户自定义消息 implementation {$R *.dfm} function StartHook(sender : HWND;MessageID : WORD) : BOOL;stdcall; external 'DllMouse.DLL'; function StopHook: BOOL;stdcall; external 'DllMouse.DLL'; procedure TForm1.WndProc(var Messages: TMessage);var x,y:integer; s:array[0..255]of char;begin if pShMem = nil then //自定义消息的处理 begin hMappingFile := OpenFileMapping(FILE_MAP_WRITE,False,MappingFileName);//打开由dll创建的共享内存，名称是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); //映射共享内存 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 //如果是钩子发来的消息 begin x:=pShMem^.data2.pt.x; // 鼠标坐标 y:=pShMem^.data2.pt.y; edit3.text:=inttostr(pShMem^.data2.hwnd); //句柄 panel1.caption:='x='+inttostr(x)+' y='+inttostr(y); edit2.text:=string(pShMem^.buffer); //内容 getClassName(pShMem^.data2.hwnd,s,255); edit1.text:=string(s); //类名 end else Inherited;end; procedure TForm1.FormCreate(Sender: TObject);begin StartHook(Form1.Handle,MessageID);//开始挂钩，并传递本窗口句柄及自定义消息编号。系统钩子 //dll文件向本程序（form1.handle）发送此消息（MessageID） pShMem := nil;end; procedure TForm1.FormClose(Sender: TObject; var Action: TCloseAction);beginStopHook;end; end. 最后看下效果，如图： 源码我传上来吧，自己可以修改版权，欢迎大家篡改！ |
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