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| 关键词： nbsp Procedure begin end function sender MessageID NextHook pMem CloseGetKeyHook |
为什么选这个话题？因为跟踪MOUSE坐标很常见，容易又特别不容易，非常说明W INDOWS95下编程的特点。 { 如果您看不懂，请买DELPHI 2 UNLEASHED RMB133，当然他没这个程序，但有一 些写WIN HOOK必须具备的知识。本程序得到AIMING大虾的大力协助，事实上我的 程序是在他的基础上改写的，他的是从DELPHI HELP中改写出来的。调试程序花了 我两个礼拜，最好你能花同样的时间，那么你就会收获很多！ } 第一步，建一DLL，DELPHI中NEW-》DLL SAVE AS GETKEY library getKey; uses uses SysUtils, Windows, HookMain in 'hookmain.pas'; exports OpenGetKeyHook, CloseGetKeyHook, GetPublicP; begin NextHook := 0; procSaveExit := ExitProc; DLLproc := @DLLMain; ExitProc := @HookExit; DLLMain(DLL_PROCESS_ATTACH); end. 第二步，建一UNIT ，HOOK MAIN。关键在于CreateFileMapping 和 消息 WM_NCM ouseMove, WM_MOUSEMOVE: unit HookMain; interface uses Windows, Messages, Dialogs, SysUtils; //type DataBuf = Array [1..2] of DWORD; type mydata=record data1:array [1..2] of DWORD; data2:TMOUSEHOOKSTRUCT; end; var hObject : THandle; pMem : Pointer; NextHook: HHook; procSaveExit: Pointer; function HookHandler(iCode: Integer; wParam: WPARAM; lParam: LPARAM): LRESULT; stdcall; export; function OpenGetKeyHook(sender : HWND;MessageID : WORD) : BOOL; export ; function CloseGetKeyHook: BOOL; export; function GetPublicP : Pointer;stdcall; export; Procedure DLLMain(dwReason:DWord); far; procedure HookExit; far; implementation Procedure UnMapMem; begin if Assigned(pMem) then begin UnMapViewOfFile(pMem); pMem := Nil end; end; Procedure MapMem; begin hObject := CreateFileMapping($FFFFFFFF,Nil,Page_ReadWrite,0,$FFFF,pCha r('_IOBuffer')); if hObject = 0 then Raise Exception.Create('创建公用数据的Buffer不成功 !'); pMem := MapViewOfFile(hObject,FILE_MAP_WRITE,0,0,SizeOf(mydata)); // 1 or SizeOf(DataBuf) ???? // 创建SizeOf(DataBuf)的数据区 if not Assigned(pMem) then begin begin UnMapMem; Raise Exception.Create('创建公用数据的映射关系不成功!'); end; end; Procedure DLLMain(dwReason:DWord); far; begin Case dwReason of DLL_PROCESS_ATTACH : begin pMem := nil; hObject := 0; MapMem; //以下的公有数据，如tHWND,tMessageID将直接使用本Buf. end; DLL_PROCESS_DETACH : UnMapMem; DLL_THREAD_ATTACH, DLL_THREAD_DETACH :; //缺省 end; end; procedure HookExit; far; begin CloseGetKeyHook; ExitProc := procSaveExit; end; function GetPublicP : Pointer;export; begin //这里引出了公用数据区的指针，你可以在你的应用程序中自由操作它。 但建议去掉此接口。 Result := pMem; 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); // This is probably closer to what you would want to do... case wparam of WM_LBUTTONDOWN: begin end; end; WM_LBUTTONUP: begin end; WM_LBUTTONDBLCLK: begin end; WM_RBUTTONDOWN: begin messagebeep(1); end; WM_RBUTTONUP: begin end; WM_RBUTTONDBLCLK: begin end; WM_MBUTTONDOWN: begin end; WM_MBUTTONUP: begin end; end; WM_MBUTTONDBLCLK: begin end; WM_NCMouseMove, WM_MOUSEMOVE: begin mydata(pmem^).data2:=pMOUSEHOOKSTRUCT(lparam)^; // messagebeep(1); //SendMessage(DataBuf(pMem^)[1],DataBuf(pMem^)[2],wParam,lParam ); SendMessage(mydata(pMem^).data1[1],mydata(pMem^).data1[2],wParam,integ er(@(mydata(pmem^).data2)) ); end; end; //发送消息 end; function OpenGetKeyHook(sender : HWND;MessageID : WORD) : BOOL; export ; begin Result := False; if NextHook <> 0 then Exit; //已经安装了本钩子 // DataBuf(pMem^)[1] := Sender; //填数据区 // DataBuf(pMem^)[2] := MessageID; //填数据区 mydata(pmem^).data1[1]:=sender; mydata(pmem^).data1[2]:=messageid; NextHook := SetWindowsHookEx(WH_mouse, HookHandler, HInstance, 0); Result := NextHook <> 0; end; function CloseGetKeyHook: BOOL; export; begin if NextHook <> 0 then begin UnhookWindowshookEx(NextHook); //把钩子链链接到下一个钩子处理上. NextHook := 0; end; Result := NextHook = 0; end; end. 第三步，测试DLL，建一PROJECT。关键在于override WndProc unit Unit1; interface uses Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialo gs, StdCtrls, ExtCtrls; type TForm1 = class(TForm) uncapture: TButton; capture: TButton; Exit: TButton; Panel1: TPanel; show: TLabel; Label1: TLabel; counter: TLabel; procedure ExitClick(Sender: TObject); procedure uncaptureClick(Sender: TObject); procedure captureClick(Sender: TObject); private { Private declarations } public { Public declarations } procedure WndProc(var Message: TMessage); override; end; var Form1: TForm1; var num : integer; const MessageID = WM_User + 100; implementation {$R *.DFM} function OpenGetKeyHook(sender : HWND;MessageID : WORD) : BOOL; extern al 'GetKey.DLL'; function CloseGetKeyHook: BOOL; external 'GetKey.DLL'; procedure TForm1.ExitClick(Sender: TObject); begin close; end; end; procedure TForm1.uncaptureClick(Sender: TObject); begin if CloseGetKeyHook then //ShowMessage('结束记录...'); show.caption:='结束记录...'; end; procedure TForm1.captureClick(Sender: TObject); begin // if OpenGetKeyHook(self.Handle,MessageID) then ShowMessage('开始记录 ...'); if OpenGetKeyHook(Form1.Handle,MessageID) then //ShowMessage('开始记录...'); show.caption:='开始记录...'; num := 0; end; procedure TForm1.WndProc(var Message: TMessage); var x,y:integer; begin if Message.Msg = MessageID then begin // Panel1.Caption := IntToStr(Num); x:=PMouseHookStruct( message.lparam)^.pt.x ; y:=PMouseHookStruct( message.lparam)^.pt.y ; panel1.caption:='x='+inttostr(x)+' y='+inttostr(y); inc(Num); counter.Caption := IntToStr(Num); end else Inherited; end; end. |
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