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{}
const
HWND_MESSAGE = HWND(-3);
const
ACF_ASSIGNED = $80000000; // hook assigned
ACF_DISABLED = $10000000; // hook disabled
const
WM_RESETHOOKS = WM_USER+1312;
WM_FIRSTHOOK = WM_USER+1313;
WM_LASTHOOK = WM_FIRSTHOOK+1000;
type
pHookRec = ^tHookRec;
tHookRec = record
flags :dword;
name :PAnsiChar; // name for hook
handle :THANDLE; // handle of hook
descr :PWideChar; // name for list
action :dword; // assigned action
message:uint; // window message for hook
end;
pHookList = ^tHookList;
tHookList = array [0..1023] of tHookRec;
var
HookList:pHookList = nil;
MaxHooks:integer = 0;
MessageWindow:HWND = 0;
function GetNextMessage:uint;
var
i:uint;
j:integer;
begin
result:=0;
for i:=WM_FIRSTHOOK to WM_LASTHOOK do
begin
for j:=0 to MaxHooks-1 do
begin
with HookList^[j] do
begin
if ((flags and ACF_ASSIGNED)<>0) and (i=message) then
begin
inc(result);
break;
end;
end;
end;
if result=0 then
begin
result:=i;
break;
end
else
result:=0;
end;
end;
procedure SetAllHooks;
var
i:integer;
msg:cardinal;
begin
msg:=WM_FIRSTHOOK;
for i:=0 to MaxHooks-1 do
begin
with HookList[i] do
begin
message:=msg;
if (flags and ACF_ASSIGNED)<>0 then
begin
if (flags and ACF_DISABLED)<>0 then
begin
if handle<>0 then
begin
UnhookEvent(handle);
handle:=0;
end;
end
else
begin
if handle<>0 then
UnhookEvent(handle);
handle:=HookEventMessage(name,MessageWindow,message);
end;
end;
end;
inc(msg);
end;
end;
function GetHookByMessage(msg:uint):pHookRec;
var
i:integer;
begin
result:=nil;
for i:=0 to MaxHooks-1 do
begin
with HookList[i] do
begin
if ((flags and ACF_ASSIGNED)<>0) and (msg=message) then
begin
result:=@HookList[i];
break;
end;
end;
end;
end;
function HookWndProc(Dialog:HWnd;hMessage:UINT;wParam:WPARAM;lParam:LPARAM):lresult; stdcall;
var
p:pHookRec;
ap:tAct_Param;
begin
result:=0;
case hMessage of
WM_FIRSTHOOK..WM_LASTHOOK: begin
p:=GetHookByMessage(hMessage);
if p<>nil then
begin
ap.flags :=ACTP_WAIT;
ap.Id :=p^.action;
ap.wParam:=wParam;
ap.lParam:=lParam;
result:=CallService(MS_ACT_RUNPARAMS,0,TLPARAM(@ap));
end;
end;
else
result:=DefWindowProc(Dialog,hMessage,wParam,lParam);
end;
end;
procedure ClearHooks;
var
i:integer;
begin
for i:=0 to MaxHooks-1 do
begin
with HookList[i] do
begin
if (flags and ACF_ASSIGNED)<>0 then
begin
mFreeMem(descr);
mFreeMem(name);
if handle<>0 then
UnhookEvent(handle);
end;
end;
end;
FreeMem(HookList);
MaxHooks:=0;
end;
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