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|
library Winhook;
uses
Windows, Messages, SysUtils, dialogs, tlhelp32;
// Memory map file stuff
{
The CreateFileMapping function creates unnamed file-mapping
object for the specified file.
}
// Actual hook stuff
type
TPMsg = ^TMsg;
const
MMFName = 'MsgFilterHookDemo';
type
PMMFData = ^TMMFData;
TMMFData = record
NextHook: HHOOK;
WinHandle: HWND;
MsgToSend: Integer;
end;
// global variables, only valid in the process which installs
//the hook.
var
MMFHandle: THandle;
MMFData: PMMFData;
IDProc: Tprocessentry32;
//processid,processhandle: cardinal;
function CreateMMF(Name: string; Size: Integer): THandle;
begin
Result := CreateFileMapping($FFFFFFFF, nil, PAGE_READWRITE, 0,
Size, PChar(Name));
if Result <> 0 then
begin
if GetLastError = ERROR_ALREADY_EXISTS then
begin
CloseHandle(Result);
Result := 0;
end;
end;
end;
{ The OpenFileMapping function opens a named file-mapping object. }
function OpenMMF(Name: string): THandle;
begin
Result := OpenFileMapping(FILE_MAP_ALL_ACCESS, False,
PChar(Name));
// The return value is an open handle to the specified
//file-mapping object.
end;
{
The MapViewOfFile function maps a view of a file into
the address space of the calling process.
}
function MapMMF(MMFHandle: THandle): Pointer;
begin
Result := MapViewOfFile(MMFHandle, FILE_MAP_ALL_ACCESS, 0, 0, 0);
end;
{
The UnmapViewOfFile function unmaps a mapped view of a file
from the calling process's address space.
}
function UnMapMMF(P: Pointer): Boolean;
begin
Result := UnmapViewOfFile(P);
end;
function CloseMMF(MMFHandle: THandle): Boolean;
begin
Result := CloseHandle(MMFHandle);
end;
function UnMapAndCloseMMF: Boolean;
begin
Result := False;
if UnMapMMF(MMFData) then
begin
MMFData := nil;
if CloseMMF(MMFHandle) then
begin
MMFHandle := 0;
Result := True;
end;
end;
end;
//---------------------------------------------------------
//fonction de remplacement pour le traitement du message
function MsgFilterFunc(Code: Integer; MwParam: integer;
MlParam: integer): integer; stdcall;
var
MMFHandle: THandle;
MMFData: PMMFData;
begin
Result := 0;
MMFHandle := OpenMMF(MMFName);
if MMFHandle <> 0 then
begin
MMFData := MapMMF(MMFHandle);
if MMFData <> nil then
begin
if (Code < 0) or (MwParam = PM_NOREMOVE) then
Result := CallNextHookEx(MMFData.NextHook, Code, MwParam,
MlParam)
else
begin
if TPMsg(mlParam)^.message = WM_COMMAND then
showmessage(':WM_COMMAND:');
Result := CallNextHookEx(MMFData.NextHook, Code, MwParam,MlParam);
end;
UnMapMMF(MMFData);
end;
CloseMMF(MMFHandle);
end;
end;
//---------------------------------------------------------
//Trouve l'ID du processus du programme a surveiller
function IDHandle: cardinal;
var shothdl: Thandle;
begin
Result := 0;
IDProc.dwSize := sizeof(IDProc);
shothdl := createtoolhelp32snapshot(TH32CS_SNAPPROCESS, 0);
try
if shothdl=-1 then exit;
if process32first(shothdl,IDProc) then
begin
while process32next(shothdl,IDProc) do
begin
if ansisametext(IDProc.szExeFile,'progatester.exe') then
begin
result := IDProc.th32ProcessID;
showmessage('ok processus '+inttostr(result));
break;
end;
end;
end;
finally
begin
closehandle(shothdl);
showmessage('ok processus '+inttostr(result));
end;
end;
end;
//---------------------------------------------------------
//Mise en place du hook avec WH_CALLWNDPROC pour interception
//des messages WM_COMMAND
function SetHook(WinHandle: HWND; MsgToSend: Integer):
Boolean; stdcall;
begin
Result := False;
MMFHandle := 0;
MMFData := nil;
if (MMFData = nil) and (MMFHandle = 0) then
begin
MMFHandle := CreateMMF(MMFName, SizeOf(TMMFData));
if MMFHandle <> 0 then
begin
MMFData := MapMMF(MMFHandle);
if MMFData <> nil then
begin
MMFData.WinHandle := WinHandle;
MMFData.MsgToSend := MsgToSend;
MMFData.NextHook := SetWindowsHookEx(WH_CALLWNDPROC,
MsgFilterFunc, HInstance,IDHandle);
showmessage(inttostr(MMFData.NextHook));
if MMFData.NextHook = 0 then
UnMapAndCloseMMF
else
Result := True;
end
else
begin
CloseMMF(MMFHandle);
MMFHandle := 0;
end;
end;
end;
end;
//---------------------------------------------------------
//Suppression du hook
function FreeHook: Boolean; stdcall;
begin
Result := False;
if (MMFData <> nil) and (MMFHandle <> 0) then
if UnHookWindowsHookEx(MMFData^.NextHook) then
Result := UnMapAndCloseMMF;
end;
exports
SetHook ,
FreeHook ;
end. |
