运用HOOK创建鼠标增强程序

New ，选择Unit建立一个Pas文件，保存为 HKProc.pas
//HKProc.pas源程序
unit hkproc;

interface
uses
Windows,Messages;
const
Move_Up = 0;

Move_Down=1;
Move_Left=2;
Move_Right=3;
var
hNextHookProc:HHook;
procSaveExit:Pointer;
M_Direct:Integer;
LPoint:TPoint;
NowWindow:Integer;

function MouseProc(iCode:Integer;wParam:WPARAM;
lParam:Pointer):LRESULT; stdcall;export;
function EnableMouseHook(WndHandle:integer):BOOL;export;

function DisableMouseHook:BOOL;export;
function GetDirect(FPoint : TPoint;LPoint : TPoint):integer;
procedure HotKeyHookExit;far;

　

implementation

//GetDirect函数根据光标的移动决定窗口滚动的方向。
function GetDirect(FPoint : TPoint;LPoint : TPoint):integer;
var
iWidth,iHeight:integer;
begin
iWidth:=LPoint.x-FPoint.x;
iHeight:=lPoint.y-FPoint.y;
Result:=-1;

if ((iWidth=0)or(iHeight=0))then
exit;

if ((abs(iWidth) div abs(iHeight))>=2) then
if iWidth<0 then //Move to left
Result:=Move_Left
else
Result:=Move_Right

else if ((abs(iHeight) div abs(iWidth))>=2) then
if iHeight<0 then //Move to top
Result:=Move_Up
else
Result:=Move_Down;

end;

function MouseProc(iCode:Integer;wParam:WPARAM;
lParam:Pointer):LRESULT; stdcall;export;
var
pMouse:^MOUSEHOOKSTRUCT;
l:integer;
begin
//如果用户按下鼠标右键同时Scroll Lock键为按下状态则
//滚动窗口。
if ((wParam=WM_RBUTTONDOWN) and Boolean(GetKeyState(145))) then
begin
pMouse:=lParam;
l:=GetDirect(lPoint,pMouse.pt);
if l>=0 then
M_Direct:=l;
lPoint:=pMouse.pt;

NowWindow:=WindowFromPoint(lPoint);
if M_Direct=Move_Up then
SendMessage(NowWindow,WM_VSCROLL,SB_PAGEUP,0)
else if M_Direct=Move_Down then

SendMessage(NowWindow,WM_VSCROLL,SB_PAGEDOWN,0)
else if M_Direct=Move_Left then
SendMessage(NowWindow,WM_HSCROLL,SB_PAGELEFT,0)
else if M_Direct=Move_Right then
SendMessage(NowWindow,WM_HSCROLL,SB_PAGERIGHT,0);
Result:=1;
exit;
end
else if ((wParam=WM_RBUTTONUP) and Boolean(GetKeyState(145))) then
Result:=1
else
begin
Result:=0;
if iCode<0 then
begin
Result:=CallNextHookEx(hNextHookProc,iCode,wParam,
integer(lParam));
Exit;
end;
end;
end;

function EnableMouseHook(WndHandle:integer):BOOL;export;
begin
GetCursorPos(lPoint);
Result:=False;
if hNextHookProc<>0 then
exit;
//设置Mouse hook
hNextHookProc:=SetWindowsHookEx(WH_MOUSE,@MouseProc,
Hinstance,0);
Result:=hNextHookProc<>0;
end;

function DisableMouseHook:BOOL;export;
begin
if hNextHookProc<>0 then
begin
UnHookWindowsHookEx(hNextHookProc);
hNextHookProc:=0;
end;
Result:=hNextHookProc=0;
end;

procedure HotKeyHookExit;
begin
if hNextHookProc<>0 then
DisableMouseHook;
ExitProc:=procSaveExit;
end;

end.
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