I want to set a global system hook for keyboard and mouse in C++ using a DLL. My program is working but not exactly as I need. For example the program will not hook mouse events on other windows or popup menu, or modal dialogs. I want to hook the mouse and keyboard events anywhere in other windows, programs, ect.., all system mouse and keyboard events. What is wrong with my code what to change to get it to work as I need, I cannot find myself what is wrong, I'm doing as is described in documentation, I need help.
I'm coding in C++ Builder using VCL
DLL:
#include <vcl.h>
#include <windows.h>
#include "main.h"
#pragma hdrstop
#pragma argsused
typedef struct _HOOKSTRUCT
{
int nType;
HOOKPROC hkprc;
HHOOK hhook;
bool bInstalled;
} HOOKSTRUCT;
static HOOKSTRUCT hook[2];
HINSTANCE hDLL;
int nThreadCode;
bool bInit;
TForm1 *form;
extern "C" __stdcall __declspec(dllexport) LRESULT CALLBACK KeyboardProc(int nCode, WPARAM wParam, LPARAM lParam);
extern "C" __stdcall __declspec(dllexport) LRESULT CALLBACK MouseProc(int nCode, WPARAM wParam, LPARAM lParam);
//---------------------------------------------------------------------------
int WINAPI DllEntryPoint(HINSTANCE hinst, unsigned long reason, void* lpReserved)
{
hDLL = hinst;
bInit = false;
return 1;
}
//---------------------------------------------------------------------------
extern "C" __stdcall __declspec(dllexport) void Init()
{
hook[0].nType = WH_KEYBOARD;
hook[0].hkprc = (HOOKPROC)KeyboardProc;
hook[0].bInstalled = false;
hook[1].nType = WH_MOUSE;
hook[1].hkprc = (HOOKPROC)MouseProc;
hook[1].bInstalled = false;
bInit = true;
}
//---------------------------------------------------------------------------
extern "C" __stdcall __declspec(dllexport) bool SetHook(int nHook)
{
if(!bInit)
{
Init();
}
hook[nHook].hhook = NULL;
hook[nHook].hhook = SetWindowsHookEx(hook[nHook].nType,
(HOOKPROC)hook[nHook].hkprc, hDLL, 0);
if(hook[nHook].hhook != NULL)
{
MessageBox(NULL, "Setup hook successful", "Information", MB_OK);
}
return true;
}
//---------------------------------------------------------------------------
extern "C" __stdcall __declspec(dllexport) void UnsetHook(int nHook)
{
UnhookWindowsHookEx(hook[nHook].hhook);
}
//---------------------------------------------------------------------------
extern "C" __stdcall __declspec(dllexport) LRESULT CALLBACK KeyboardProc(int nCode, WPARAM wParam, LPARAM lParam)
{
if(((DWORD)lParam&0x40000000) && (HC_ACTION==nCode))
{
if(form != NULL)
{
form->Memo1->Lines->Add("Key Pressed");
}
}
return CallNextHookEx(hook[0].hhook, nCode, wParam, lParam);
}
//---------------------------------------------------------------------------
extern "C" __stdcall __declspec(dllexport) LRESULT CALLBACK MouseProc(int nCode, WPARAM wParam, LPARAM lParam)
{
char str[128];
PMOUSEHOOKSTRUCT Info = (PMOUSEHOOKSTRUCT)lParam;
wsprintf(str, "The mouse message at X: %d,Y: %d", Info->pt.x, Info->pt.y);
form->Memo2->Lines->Add(str);
return CallNextHookEx(hook[1].hhook, nCode, wParam, lParam);
}
//---------------------------------------------------------------------------
extern "C" __stdcall __declspec(dllexport) void SetControl(TForm1 *Object, int nApp)
{
form = Object;
nThreadCode = nApp;
}
Program:
#include <vcl.h>
#pragma hdrstop
#include "main.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
HINSTANCE hInst;
typedef bool (*install)(int);
typedef void (*uninstall)(int);
typedef void (*passself)(TForm1 *, int);
install InstallHook;
uninstall UninstallHook;
passself PassThis;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
: TForm(Owner)
{
N2->Enabled = true;
N3->Enabled = true;
N4->Enabled = false;
N5->Enabled = false;
}
//---------------------------------------------------------------------------
void __fastcall TForm1::FormCreate(TObject *Sender)
{
Memo1->Clear();
Memo2->Clear();
hInst = LoadLibrary("ch49dll.dll");
if(hInst == NULL)
{
ShowMessage("Load DLL error " + AnsiString(GetLastError()));
return;
}
InstallHook = (install)GetProcAddress(hInst, "SetHook");
if(InstallHook == NULL)
{
ShowMessage("Get SetHook ProcAddress Error");
return;
}
UninstallHook = (uninstall)GetProcAddress(hInst, "UnsetHook");
if(UninstallHook == NULL)
{
ShowMessage("Get UnsetHook ProcAddress Error");
return;
}
PassThis = (passself)GetProcAddress(hInst, "SetControl");
if(PassThis == NULL)
{
ShowMessage("Get SetControl ProcAddress Error");
return;
}
PassThis(this, 0);
}
//---------------------------------------------------------------------------
void __fastcall TForm1::FormDestroy(TObject *Sender)
{
FreeLibrary(hInst);
}
//---------------------------------------------------------------------------
void __fastcall TForm1::N2Click(TObject *Sender)
{
InstallHook(0);
N2->Enabled = false;
N4->Enabled = true;
}
//---------------------------------------------------------------------------
void __fastcall TForm1::N3Click(TObject *Sender)
{
InstallHook(1);
N3->Enabled = false;
N5->Enabled = true;
}
//---------------------------------------------------------------------------
void __fastcall TForm1::N4Click(TObject *Sender)
{
UninstallHook(0);
N4->Enabled = false;
N2->Enabled = true;
}
//---------------------------------------------------------------------------
void __fastcall TForm1::N5Click(TObject *Sender)
{
UninstallHook(1);
N5->Enabled = false;
N3->Enabled = true;
}
//---------------------------------------------------------------------------
void __fastcall TForm1::N7Click(TObject *Sender)
{
Close();
}
//---------------------------------------------------------------------------
Program header:
#ifndef mainH
#define mainH
//---------------------------------------------------------------------------
#include <Classes.hpp>
#include <Controls.hpp>
#include <StdCtrls.hpp>
#include <Forms.hpp>
#include <Menus.hpp>
//---------------------------------------------------------------------------
class TForm1 : public TForm
{
__published: // IDE-managed Components
TMemo *Memo1;
TMemo *Memo2;
TMainMenu *MainMenu1;
TMenuItem *N1;
TMenuItem *N2;
TMenuItem *N3;
TMenuItem *N4;
TMenuItem *N5;
TLabel *Label1;
TLabel *Label2;
TMenuItem *N6;
TMenuItem *N7;
void __fastcall FormCreate(TObject *Sender);
void __fastcall FormDestroy(TObject *Sender);
void __fastcall N2Click(TObject *Sender);
void __fastcall N3Click(TObject *Sender);
void __fastcall N4Click(TObject *Sender);
void __fastcall N5Click(TObject *Sender);
void __fastcall N7Click(TObject *Sender);
private: // User declarations
public: // User declarations
__fastcall TForm1(TComponent* Owner);
};
//---------------------------------------------------------------------------
extern PACKAGE TForm1 *Form1;
//---------------------------------------------------------------------------
#endif
So the program work and can hook external events, but for some dialog windows , my program will not hook the mouse events. for example when I right click the icon from taskbar Notification Area , a popup will display and if I enter mouse cursor in the popup window area then my program will not record those mouse move events. Other case is when I click About program menu in other programs, or About menu, then a window will display and if I move my cursor inside the area of that window then my program will not hook events of mouse and keyboard, why ? how to make it to hook anywhere for any window
