钩子学习心得
闲来无事，自己花了一天时间学习了下钩子在DELPHI中的使用,这只是一个局部变量的钩子，
1 首先定义钩子的基本变量
type
THookDataOutputProc = procedure(PBuffer: PChar);stdcall;
THookData = record
Installed: Boolean;
Hhk: HHook;
CallBackProc: THookDataOutputProc;
Code: Integer;
Wparam: WPARAM;
Lparam: LPARAM;
end;
2 使用钩子前，必须安装钩子到系统中的钩链去，使用
procedure InstallHooks(HookDataOutputProc: THookDataOutputProc); stdcall;
begin
try
HooksData[WH_MOUSE].hhk := SetWindowsHookEx(WH_MOUSE, @MouseProc, 0, GetCurrentThreadId()); //将MouseProc函数挂到钩链中去处理消息
HooksData[WH_MOUSE].CallbackProc := HookDataOutputProc; //指定回调函数此函数是调用EXE的函数做为参数传递进来
HooksData[WH_MOUSE].Installed := True;
except
on E: Exception do
begin
UninstallHooks();
MessageDlg('Error in ''HookDll.dll''', mtError, [mbOk], 0);
end;
end;
end;
//此函数是钩子中最重要的函数
function MouseProc(Code: Integer; Wparam: WPARAM; Lparam: LPARAM): LRESULT;stdcall;
const
pFmt = '鼠标钩子回调：事件： %s ; 信息:%s; 鼠标位置: (%d %d)';
var
pMsg: PChar;
pCode: PChar;
PBuffer: array[0..127] of Char;
MouseInfo: TMouseHookStruct;
begin
try
if Code < 0 then
begin
//如果CODE小于0。也要将它与下一个钩链起来
Result := CallNextHookEx(HooksData[WH_MOUSE].Hhk, Code, Wparam, Lparam);
Exit;
end;
//判断是否有回调函数
if Assigned(HookSData[WH_Mouse].CallbackProc) then
begin
//Code参数表示钩码，其值取决于钩过程的类型
case Code of
HC_ACTION: pCode := 'Hc_ACtion';
HC_NOREMOVE: pCode := 'Hc_NoreMove'
else
pCode := 'UnKnown';
end;
WMToPChar(Wparam, PMsg); //其实是一个转换过程，Wparam其实就是WM消息,将其转成字符
MouseInfo := TMouseHookStruct(Pointer(Lparam)^);//获得消息的附加值
StrLFmt(pBuffer, 128, pFmt, [pCode, pMsg, MouseInfo.pt.X, MouseInfo.pt.Y]);//格式化字符，不用我说了吧
HooksData[Wh_Mouse].CallBackProc(PBuffer);
//调用回调函数，其实就EXE传进来的那个
end;
Result := CallNextHookEx(HooksData[WH_MOUSE].Hhk, Code, Wparam, Lparam);
except
on E: Exception do
begin
Result := CallNextHookEx(HooksData[WH_MOUSE].hhk, code, wparam, lparam);
MessageDlg('Error in ''HookDll.dll''', mtError, [mbOk], 0);
end;
end;
end;
//这段不用解释，白痴都能看懂
procedure UninstallHooks(); stdcall;
var
I: Integer;
begin
try
for I := WH_MIN to WH_MAX do
begin
if HooksData[I].Installed then
begin
UnhookWindowsHookEx(HooksData[I].hhk);
HooksData[I].Installed := False;
end;
end;
except
on E: Exception do
MessageDlg('Error in ''HookDll.dll''', mtError, [mbOk], 0);
end;
end;
{ Entry point of 'HookDll.dll' }
procedure HookDllEntryPoint(dwReason: DWORD); stdcall;
var
I: Integer;
begin
case dwReason of
DLL_PROCESS_ATTACH:
begin
for I := WH_MIN to WH_MAX do
HooksData[I].Installed := False;
end;
DLL_PROCESS_DETACH:
begin
UninstallHooks();
end;
DLL_THREAD_ATTACH: ;
DLL_THREAD_DETACH: ;
end;
end;
其中有一句解释: { Called whenever DLL entry point is called } 我的理解是: 每当调用 DLL 文件时将会调用 DLLProc 指向的方法, 应该是用作 DLL 中某些值的初始化, 有点类似与类的 ...
然后就是
exports
InstallHooks, UninstallHooks, MouseProc;
begin
DllProc := @HookDllEntryPoint;
//DLLPROC我查帮助一直没查到，（{ Called whenever DLL entry point is called }DELPHI帮助里是这么写的）
我的理解是:每当调用 DLL 文件时将会调用 DLLProc 指向的方法
DllProc(DLL_PROCESS_ATTACH);
end.
到这里钩子DLL代码就完了,下边是EXE代码，都不用解释了
unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls;
type
THookDataOutputProc = procedure (pBuffer: PChar); stdcall;
TForm1 = class(TForm)
Memo1: TMemo;
procedure FormCreate(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;
var
Form1: TForm1;
procedure UninstallHooks(); stdcall;external 'HookDll.dll' name 'UninstallHooks';
procedure InstallHooks(HookDataOutputProc: THookDataOutputProc); stdcall; external 'HookDll.dll' name 'InstallHooks';
procedure AddString(Sender: PChar);stdcall;
implementation
{$R *.dfm}
procedure AddString(Sender: PChar); stdcall;
begin
Form1.Memo1.Lines.Add(Sender);
end;
procedure TForm1.FormCreate(Sender: TObject);
begin
InstallHooks(AddString);
end;
end.
2
function WindowsHook(Code: Integer; wParam: Integer; lParam: Integer): LRESULT; stdcall;
var
pStruct: PCWPStruct;
begin
pStruct := PCWPStruct(lParam);
if (Code = HC_ACTION) and (pStruct^.message = WM_SETTINGCHANGE) then Exit;
Result := CallNextHookEx(WH_CALLWNDPROC, Code, wParam, lParam);
end;
SetWindowsHookEx(WH_CALLWNDPROC, WindowsHook, hInstance, GetCurrentThreadId);
3 全局钩
unit Unit4;
interface
uses
Windows, Messages, SysUtils, Unit3;
function HookProc(iCode: integer; wParam: wParam; lParam: lParam): LResult; stdcall;
function Keyhookresult(lP: integer; wP: integer): pchar;
implementation
function Keyhookresult(lP: integer; wP: integer): pchar;
begin
result := '[Print Screen]';
case lp of
14354: result := '[Alt]'; //不能识别
10688: result := '`';
561: Result := '1';
818: result := '2';
1075: result := '3';
1332: result := '4';
1589: result := '5';
1846: result := '6';
2103: result := '7';
2360: result := '8';
2617: result := '9';
2864: result := '0';
3261: result := '-';
3515: result := '=';
4177: result := 'Q';
4439: result := 'W';
4677: result := 'E';
4946: result := 'R';
5204: result := 'T';
5465: result := 'Y';
5717: result := 'U';
5961: result := 'I';
6223: result := 'O';
6480: result := 'P';
6875: result := '[';
7133: result := ']';
11228: result := '\';
7745: result := 'A';
8019: result := 'S';
8260: result := 'D';
8518: result := 'F';
8775: result := 'G';
9032: result := 'H';
9290: result := 'J';
9547: result := 'K';
9804: result := 'L';
10170: result := ';';
10462: result := '''';
11354: result := 'Z';
11608: result := 'X';
11843: result := 'C';
12118: result := 'V';
12354: result := 'B';
12622: result := 'N';
12877: result := 'M';
13244: result := ',';
13502: result := '.';
13759: result := '/';
13840: result := '[Right-Shift]';
14624: result := '[Space]';
283: result := '[Esc]';
15216: result := '[F1]';
15473: result := '[F2]';
15730: result := '[F3]';
15987: result := '[F4]';
16244: result := '[F5]';
16501: result := '[F6]';
16758: result := '[F7]';
17015: result := '[F8]';
17272: result := '[F9]';
17529: result := '[F10]';
22394: result := '[F11]';
22651: result := '[F12]';
10768: Result := '[Left-Shift]';
14868: result := '[CapsLock]';
3592: result := '[Backspace]';
3849: result := '[Tab]';
7441:
if wp > 30000 then
result := '[Right-Ctrl]'
else
result := '[Left-Ctrl]';
13679: result := '[Num /]';
17808: result := '[NumLock]';
300: result := '[Print Screen]';
18065: result := '[Scroll Lock]';
17683: result := '[Pause]';
21088: result := '[Num0]';
21358: result := '[Num.]';
20321: result := '[Num1]';
20578: result := '[Num2]';
20835: result := '[Num3]';
19300: result := '[Num4]';
19557: result := '[Num5]';
19814: result := '[Num6]';
18279: result := '[Num7]';
18536: result := '[Num8]';
18793: result := '[Num9]';
19468: result := '[*5*]';
14186: result := '[Num *]';
19053: result := '[Num -]';
20075: result := '[Num +]';
21037: result := '[Insert]';
21294: result := '[Delete]';
18212: result := '[Home]';
20259: result := '[End]';
18721: result := '[PageUp]';
20770: result := '[PageDown]';
18470: result := '[UP]';
20520: result := '[DOWN]';
19237: result := '[LEFT]';
19751: result := '[RIGHT]';
7181: result := '[Enter]';
end;
end;
//钩子回调过程
function HookProc(iCode: integer; wParam: wParam; lParam: lParam): LResult;
stdcall;
var
s: string;
begin
if (PEventMsg(lparam)^.message = WM_KEYDOWN) then
begin
//事件消息，键盘按下
s := format('Down:%5d %5d ', [PEventMsg(lparam)^.paramL,
PEventMsg(lparam)^.paramH]) + Keyhookresult(peventMsg(lparam)^.paramL,
peventmsg(lparam)^.paramH);
Form3.Memo1.Lines.Add(S);
end
else if (PEventMsg(lparam)^.message = WM_KEYUP) then
begin
//键盘按键
s := format(' Up:%5d %5d ', [PEventMsg(lparam)^.paramL,
PEventMsg(lparam)^.paramH]) + Keyhookresult(PEventMsg(lparam)^.paramL,
PEventMsg(lparam)^.paramH);
Form3.Memo1.Lines.Add(S);
end;
CallNextHookEx(0,nCode,wParam,lParam);
end;
end.
调用
SetWindowsHookEx(WH_JOURNALRECORD, HookProc, HInstance, 0);