Wie kann man das am besten realisieren?

Auf welchem System arbeitest du denn? Und hast du schon ein Framework oder eine API, mit welcher du arbeitest? Mit diesen Information könnte man dich weiterleiten.

Grüssli

http://www.tutorials.de/forum/c-c-tutorials/164662-tutorial-ueber-windows-hooks.html

fatal error C1010: unexpected end of file while looking for precompiled header. Did you forget to add '#include "stdafx.h"' to your source?

und wenn ich das mache wirft der compiler nur mit fehlermeldungen um sich

ich verwende Visual Studio 2008 und dort gibt es nur MFC-DLL-Projekte ?!
Kann man nicht irgendwiewie eine normale DLL erstellen?

1>c:\users\scholz\documents\visual studio 2008\hook\hook.dll\hook.dll\hook.dll.cpp(1) : warning C4627: '#include "hook.dll.h"': skipped when looking for precompiled header use
1>        Add directive to 'stdafx.h' or rebuild precompiled header
1>c:\users\scholz\documents\visual studio 2008\hook\hook.dll\hook.dll\hook.dll.cpp(4) : error C2146: syntax error : missing ';' before identifier 'SHARED'
1>c:\users\scholz\documents\visual studio 2008\hook\hook.dll\hook.dll\hook.dll.cpp(4) : error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\users\scholz\documents\visual studio 2008\hook\hook.dll\hook.dll\hook.dll.cpp(5) : error C2146: syntax error : missing ';' before identifier 'SHARED'
1>c:\users\scholz\documents\visual studio 2008\hook\hook.dll\hook.dll\hook.dll.cpp(5) : error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\users\scholz\documents\visual studio 2008\hook\hook.dll\hook.dll\hook.dll.cpp(5) : error C2374: 'SHARED' : redefinition; multiple initialization
1>        c:\users\scholz\documents\visual studio 2008\hook\hook.dll\hook.dll\hook.dll.cpp(4) : see declaration of 'SHARED'
1>c:\users\scholz\documents\visual studio 2008\hook\hook.dll\hook.dll\hook.dll.cpp(13) : error C2146: syntax error : missing ';' before identifier 'BOOL'
1>c:\users\scholz\documents\visual studio 2008\hook\hook.dll\hook.dll\hook.dll.cpp(13) : error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\users\scholz\documents\visual studio 2008\hook\hook.dll\hook.dll\hook.dll.cpp(20) : error C2065: 'MouseProc' : undeclared identifier
1>c:\users\scholz\documents\visual studio 2008\hook\hook.dll\hook.dll\hook.dll.cpp(30) : error C2146: syntax error : missing ';' before identifier 'BOOL'
1>c:\users\scholz\documents\visual studio 2008\hook\hook.dll\hook.dll\hook.dll.cpp(30) : error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\users\scholz\documents\visual studio 2008\hook\hook.dll\hook.dll\hook.dll.cpp(30) : error C2086: 'int DLLIMPORT' : redefinition
1>        c:\users\scholz\documents\visual studio 2008\hook\hook.dll\hook.dll\hook.dll.cpp(13) : see declaration of 'DLLIMPORT'
1>c:\users\scholz\documents\visual studio 2008\hook\hook.dll\hook.dll\hook.dll.cpp(50) : error C2664: 'FindWindowW' : cannot convert parameter 1 from 'const char [7]' to 'LPCWSTR'
1>        Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
1>c:\users\scholz\documents\visual studio 2008\hook\hook.dll\hook.dll\hook.dll.cpp(58) : error C2065: 'g_hMuseHook' : undeclared identifier

hook.dll.h hab ich dabei durch denn im tut beschriebenen Header ersetzt:

#include "hook.dll.h"
#include "stdafx.h"

HHOOK g_hMouseHook SHARED = NULL;
HINSTANCE g_hInst SHARED = NULL;

BOOL APIENTRY DllMain(HINSTANCE hInst, DWORD reason, LPVOID reserved)
{
	g_hInst =hInst;
	return TRUE;
}

DLLIMPORT BOOL InstallHook()
{
	if (g_hMouseHook != NULL)
	{
		return TRUE;
	}

	g_hMouseHook = SetWindowsHookEx(WH_MOUSE, MouseProc, g_hInst, 0);

	if (g_hMouseHook == NULL)
	{
		return FALSE;
	}

	return TRUE;
}

DLLIMPORT BOOL UninstallHook()
{
	if (g_hMouseHook != NULL)
	{
		UnhookWindowsHookEx(g_hMouseHook);
		g_hMouseHook = NULL;
	}
	 return TRUE;
}

LRESULT CALLBACK MouseProc(int nCode, WPARAM wParam,LPARAM lParam)
{
	if (nCode < 0)
		return CallNextHookEx(g_hMouseHook, nCode, wParam, lParam);

	if (nCode == HC_ACTION)
	{
		if ((wParam == WM_LBUTTONDOWN)||(wParam == WM_NCLBUTTONDOWN))
		{
			MOUSEHOOKSTRUCT *mhs = (MOUSEHOOKSTRUCT*)lParam;
			HWND caller = FindWindow("HOOKit", NULL);
			if (caller != NULL)
			{
				PostMessage(caller, WM_USER+123, 0 , MAKELPARAM (mhs->pt.x, mhs->pt.y));
			}
		}

	}
	return CallNextHookEx(g_hMuseHook, nCode, wParam, lParam);
}

genauso wie die hook.cll.cpp:

#include "hook.dll.h"
#include "stdafx.h"

HHOOK g_hMouseHook SHARED = NULL;
HINSTANCE g_hInst SHARED = NULL;

BOOL APIENTRY DllMain(HINSTANCE hInst, DWORD reason, LPVOID reserved)
{
	g_hInst =hInst;
	return TRUE;
}

DLLIMPORT BOOL InstallHook()
{
	if (g_hMouseHook != NULL)
	{
		return TRUE;
	}

	g_hMouseHook = SetWindowsHookEx(WH_MOUSE, MouseProc, g_hInst, 0);

	if (g_hMouseHook == NULL)
	{
		return FALSE;
	}

	return TRUE;
}

DLLIMPORT BOOL UninstallHook()
{
	if (g_hMouseHook != NULL)
	{
		UnhookWindowsHookEx(g_hMouseHook);
		g_hMouseHook = NULL;
	}
	 return TRUE;
}

LRESULT CALLBACK MouseProc(int nCode, WPARAM wParam,LPARAM lParam)
{
	if (nCode < 0)
		return CallNextHookEx(g_hMouseHook, nCode, wParam, lParam);

	if (nCode == HC_ACTION)
	{
		if ((wParam == WM_LBUTTONDOWN)||(wParam == WM_NCLBUTTONDOWN))
		{
			MOUSEHOOKSTRUCT *mhs = (MOUSEHOOKSTRUCT*)lParam;
			HWND caller = FindWindow("HOOKit", NULL);
			if (caller != NULL)
			{
				PostMessage(caller, WM_USER+123, 0 , MAKELPARAM (mhs->pt.x, mhs->pt.y));
			}
		}

	}
	return CallNextHookEx(g_hMuseHook, nCode, wParam, lParam);
}

vllt könnt ihr mir weiterhelfen
und @Dravere ich habe windows und verwende dabei winforms muss dir also recht geben

Kann man nicht irgendwiewie eine normale DLL erstellen?

Doch. Win32 Projekt, dann bei dem Wizard DLL wählen.
Simon

ich dachte eher an sowas wie hooks

Aja? Und was glaubst Du macht den detours?
Simon