其中涉及到的一些API,网上均能查到详细的解释,这里不再熬述。源码下载
因为是全局钩子,所以要用dll注入。用到的鼠标消息结构如下:
[delphi] view plaincopy
- PMouseHookStruct = ^TMouseHookStruct;
- {$EXTERNALSYM tagMOUSEHOOKSTRUCT}
- tagMOUSEHOOKSTRUCT = packed record
- pt: TPoint;
- hwnd: HWND;
- wHitTestCode: UINT;
- dwExtraInfo: DWORD;
- end;
- TMouseHookStruct = tagMOUSEHOOKSTRUCT;
DLL代码,Mouse_HookDLL
[delphi] view plaincopy
- library Mouse_HookDLL;
- { Important note about DLL memory management: ShareMem must be the
- first unit in your library‘s USES clause AND your project‘s (select
- Project-View Source) USES clause if your DLL exports any procedures or
- functions that pass strings as parameters or function results. This
- applies to all strings passed to and from your DLL--even those that
- are nested in records and classes. ShareMem is the interface unit to
- the BORLNDMM.DLL shared memory manager, which must be deployed along
- with your DLL. To avoid using BORLNDMM.DLL, pass string information
- using PChar or ShortString parameters. }
- uses
- SysUtils,
- Windows,
- Messages,
- Classes;
- {$R *.res}
- var
- NextHook : HHook;
- //调用者的Handle,用来给其发消息
- CallHandle : HWND;
- //通知调用者的消息,由调用者传进来
- MessageID : Word;
- //挂钩子函数 ,这里只处理鼠标移动,其他的鼠标动作,道理一样
- function HookProc(code:Integer;wParam:WPARAM;lParam:LPARAM):LRESULT;stdcall;
- begin
- Result := 0;
- if code < 0 then
- Result := CallNextHookEx(NextHook,code,wParam,lParam);
- case wParam of
- WM_NCMOUSEMOVE,WM_MOUSEMOVE:
- begin
- //给调用者发消息
- SendMessage(CallHandle,MessageID,wParam,Integer(@pMouseHookStruct(lParam)^));
- end;
- end;
- end;
- //启动钩子
- function StartHook(MsgID:Word):Bool;stdcall;
- begin
- Result := False;
- if NextHook <> 0 then
- Exit;
- MessageID := MsgID;
- //挂钩,SetWindowsHookEx的参数dwThreadId=0,表示挂全局的,不知道为什么,我系统是2003,用WH_MOUSE只能在本进程中实现钩子,WH_MOUSE_LL可以实现全局,在Delphi7中,是没有WH_MOUSE_LL定义的,你可以自己定义,值是14
- NextHook := SetWindowsHookEx(WH_MOUSE_LL,@HookProc,HInstance,0);
- Result := NextHook <> 0;
- end;
- //脱钩
- function StopHook:Bool;stdcall;
- begin
- if NextHook <> 0 then
- begin
- UnHookWindowsHookEx(NextHook);
- NextHook := 0;
- end;
- Result := NextHook = 0;
- end;
- //传递调用者句柄
- procedure SetCallHandle(sender:HWND);stdcall;
- begin
- CallHandle := sender;
- NextHook := 0;
- end;
- exports
- StartHook name ‘StartHook‘,
- StopHook name ‘StopHook‘,
- SetCallHandle name ‘SetCallHandle‘;
- begin
- end.
调用者代码,HookTest
[delphi] view plaincopy
- unit HookTest;
- interface
- uses
- Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
- Dialogs, StdCtrls;
- type
- TfrmHookTest = class(TForm)
- Label1: TLabel;
- procedure FormCreate(Sender: TObject);
- procedure FormClose(Sender: TObject; var Action: TCloseAction);
- private
- { Private declarations }
- //重载消息处理
- procedure WndProc(var Message: TMessage);override;
- public
- { Public declarations }
- end;
- var
- frmHookTest: TfrmHookTest;
- const
- WM_TestMsg = WM_User + 100;
- implementation
- {$R *.dfm}
- function StartHook(MsgID:Word):Bool;stdcall;external ‘Mouse_HookDLL.dll‘;
- function StopHook:Bool;stdcall;external ‘Mouse_HookDLL.dll‘;
- procedure SetCallHandle(sender:HWND);stdcall;external ‘Mouse_HookDLL.dll‘;
- procedure TfrmHookTest.FormClose(Sender: TObject; var Action: TCloseAction);
- begin
- StopHook;
- end;
- procedure TfrmHookTest.FormCreate(Sender: TObject);
- begin
- SetCallHandle(Self.Handle);
- if not StartHook(WM_TestMsg) then
- begin
- ShowMessage(‘挂钩失败!‘);
- end;
- end;
- procedure TfrmHookTest.WndProc(var Message: TMessage);
- var
- x,y:integer;
- begin
- //得到符合条件的钩子
- if Message.Msg = WM_TestMsg then
- begin
- x := pMouseHookStruct(Message.LParam)^.pt.X;
- y := pMouseHookStruct(Message.LParam)^.pt.Y;
- //显示x,y坐标
- Self.Label1.Caption := ‘鼠标当前位置:x=‘+IntToStr(x)+‘ : y=‘+IntToStr(y);
- end;
- inherited;
- end;
- end.
运行结果
http://blog.csdn.net/bdmh/article/details/5888287
时间: 2024-10-09 21:46:14