Mouse clicks handle - c++

Question

I'm trying to handle mouse events on my screen(outside of client window). I use pure Win32 API.
I have created separate DLL with SetWindowHookEx function and reference this to my Win32 Application. But its handle only window event, and when mouse is outside of window or window is not active nothing happens.
//Hook.h
#ifndef _DEFINED_44E531B1_14D3_11d5_A025_006067718D04
#define _DEFINED_44E531B1_14D3_11d5_A025_006067718D04
#if _MSC_VER > 1000
#pragma once
#endif
#ifdef __cplusplus
extern "C" {
#endif // __cplusplus
#ifdef _COMPILING_44E531B1_14D3_11d5_A025_006067718D04
#define LIBSPEC __declspec(dllexport)
#else
#define LIBSPEC __declspec(dllimport)
#endif // _COMPILING_44E531B1_14D3_11d5_A025_006067718D04
LIBSPEC BOOL InstallHook(HWND hWnd);
LIBSPEC BOOL UnInstallHook(HWND hWnd);
#undef LIBSPEC
#ifdef __cplusplus
}
#define UWM_MOUSEMOVE_MSG (L"UWM_MOUSEMOVE_USER_MSG")
#define UWM_MOUSELBUTTONUP_MSG ( L"UWM_MOUSELBUTTONUP_USER_MSG" )
#define UWM_MOUSELBUTTONDOWN_MSG ( L"UWM_MOUSELBUTTONDOWN_USER_MSG" )
#define UWM_MOUSERBUTTONUP_MSG ( L"UWM_MOUSERBUTTONUP_USER_MSG" )
#define UWM_MOUSERBUTTONDOWN_MSG ( L"UWM_MOUSERBUTTONDOWN_USER_MSG" )
#define UWM_MOUSELDBCLICK_MSG ( L"UWM_MOUSERBUTTONDOWN_USER_MSG" )
#endif // __cplusplus
#endif // _DEFINED_44E531B1_14D3_11d5_A025_006067718D04
//Hook.cpp
// Hook.cpp : Defines the exported functions for the DLL application.
//
#include "stdafx.h"
#include "Hook.h"
#pragma data_seg()
#pragma comment(linker, "/section:.Segment,rws")
HWND hWndServer = NULL;
UINT UWM_MOUSEMOVE;
UINT UWM_MOUSELBUTTONUP;
UINT UWM_MOUSELBUTTONDOWN;
UINT UWM_MOUSERBUTTONUP;
UINT UWM_MOUSERBUTTONDOWN;
UINT UWM_MOUSELDBCLICK;
HINSTANCE hInst;
//HWND hWndServer = NULL;
HHOOK hook;
static LRESULT CALLBACK MouseMsgProc(UINT nCode, WPARAM wParam, LPARAM lParam)
{
if(nCode < 0)
{
CallNextHookEx(hook, nCode, wParam, lParam);
return 0;
}
LPMSG msg = (LPMSG)lParam;
switch( msg->message )
{
case WM_LBUTTONDBLCLK:
SendMessage( hWndServer, UWM_MOUSELDBCLICK, 0 , 0);
break;
case WM_MOUSEMOVE:
SendMessage( hWndServer, UWM_MOUSEMOVE, 0, 0);
break;
case WM_NCMOUSEMOVE:
SendMessage( hWndServer, UWM_MOUSEMOVE, 0, 0);
break;
case WM_LBUTTONDOWN:
SendMessage( hWndServer, UWM_MOUSELBUTTONDOWN, 0 , 0 );
break;
case WM_NCLBUTTONDOWN:
SendMessage( hWndServer, UWM_MOUSELBUTTONDOWN, 0 , 0);
break;
case WM_LBUTTONUP:
SendMessage( hWndServer, UWM_MOUSELBUTTONUP, 0 , 0 );
break;
case WM_NCLBUTTONUP:
SendMessage( hWndServer, UWM_MOUSELBUTTONUP, 0 , 0);
break;
case WM_RBUTTONDOWN:
SendMessage( hWndServer, UWM_MOUSERBUTTONDOWN, 0 , 0 );
break;
case WM_NCRBUTTONDOWN:
SendMessage( hWndServer, UWM_MOUSERBUTTONDOWN, 0 , 0);
break;
case WM_RBUTTONUP:
SendMessage( hWndServer, UWM_MOUSERBUTTONUP, 0 , 0 );
break;
case WM_NCRBUTTONUP:
SendMessage( hWndServer, UWM_MOUSERBUTTONUP, 0 , 0);
break;
default:
break;
}
return CallNextHookEx(hook, nCode, wParam, lParam);
}
__declspec(dllexport) BOOL InstallHook( HWND hWndParent)
{
if(hWndServer != NULL)
return FALSE; // already hooked!
hook = SetWindowsHookEx( WH_GETMESSAGE, (HOOKPROC)MouseMsgProc,
hInst, 0);
if(hook != NULL)
{
hWndServer = hWndParent;
return TRUE;
}
return FALSE;
}
__declspec(dllexport) BOOL UnInstallHook( HWND hWndParent )
{
if(hWndParent != hWndServer || hWndParent == NULL)
return FALSE;
BOOL unhooked = UnhookWindowsHookEx(hook);
if(unhooked)
hWndServer = NULL;
return unhooked;
return TRUE;
}
BOOL APIENTRY DllMain( HMODULE hModule,
DWORD ul_reason_for_call,
LPVOID lpReserved
)
{
switch (ul_reason_for_call)
{
case DLL_PROCESS_ATTACH:
hInst = hModule;
UWM_MOUSEMOVE = ::RegisterWindowMessage(UWM_MOUSEMOVE_MSG);
UWM_MOUSELBUTTONUP = ::RegisterWindowMessage(UWM_MOUSELBUTTONUP_MSG);
UWM_MOUSELBUTTONDOWN = ::RegisterWindowMessage(UWM_MOUSELBUTTONDOWN_MSG);
UWM_MOUSERBUTTONUP = ::RegisterWindowMessage(UWM_MOUSERBUTTONUP_MSG);
UWM_MOUSERBUTTONDOWN = ::RegisterWindowMessage(UWM_MOUSERBUTTONDOWN_MSG);
UWM_MOUSELDBCLICK = ::RegisterWindowMessage(UWM_MOUSELDBCLICK_MSG);
case DLL_THREAD_ATTACH:
case DLL_THREAD_DETACH:
case DLL_PROCESS_DETACH:
break;
}
return TRUE;
}
//Win32 Application main.cpp
#include "stdafx.h"
#include "stdafx.h"
#include <sstream>
#include "strsafe.h"
#include "../Hook/Hook.h"
#define MAX_LOADSTRING 100
// Global Variables:
HINSTANCE hInst; // current instance
TCHAR szTitle[MAX_LOADSTRING]; // The title bar text
TCHAR szWindowClass[MAX_LOADSTRING]; // the main window class name
// Forward declarations of functions included in this code module:
ATOM MyRegisterClass(HINSTANCE hInstance);
BOOL InitInstance(HINSTANCE, int);
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
INT_PTR CALLBACK About(HWND, UINT, WPARAM, LPARAM);
//Mouse Events
static UINT UWM_MOUSEDBCLICK = ::RegisterWindowMessage( UWM_MOUSELDBCLICK_MSG );
static UINT UWM_MOUSELBUTTONUP = ::RegisterWindowMessage(UWM_MOUSELBUTTONUP_MSG);;
static UINT UWM_MOUSELBUTTONDOWN = ::RegisterWindowMessage(UWM_MOUSELBUTTONDOWN_MSG);
static UINT UWM_MOUSERBUTTONUP = ::RegisterWindowMessage(UWM_MOUSERBUTTONUP_MSG);
static UINT UWM_MOUSERBUTTONDOWN = ::RegisterWindowMessage(UWM_MOUSERBUTTONDOWN_MSG);
static UINT UWM_MOUSEMOVE = ::RegisterWindowMessage(UWM_MOUSEMOVE_MSG);
//
int APIENTRY _tWinMain(_In_ HINSTANCE hInstance,
_In_opt_ HINSTANCE hPrevInstance,
_In_ LPTSTR lpCmdLine,
_In_ int nCmdShow)
{
UNREFERENCED_PARAMETER(hPrevInstance);
UNREFERENCED_PARAMETER(lpCmdLine);
// TODO: Place code here.
MSG msg;
HACCEL hAccelTable;
// Initialize global strings
LoadString(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);
LoadString(hInstance, IDC_ACTIONX, szWindowClass, MAX_LOADSTRING);
MyRegisterClass(hInstance);
// Perform application initialization:
if (!InitInstance (hInstance, nCmdShow))
{
return FALSE;
}
hAccelTable = LoadAccelerators(hInstance, MAKEINTRESOURCE(IDC_ACTIONX));
// Main message loop:
while (GetMessage(&msg, NULL, 0, 0))
{
if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
}
return (int) msg.wParam;
}
//
// FUNCTION: MyRegisterClass()
//
// PURPOSE: Registers the window class.
//
ATOM MyRegisterClass(HINSTANCE hInstance)
{
WNDCLASSEX wcex;
wcex.cbSize = sizeof(WNDCLASSEX);
wcex.style = CS_HREDRAW | CS_VREDRAW;
wcex.lpfnWndProc = WndProc;
wcex.cbClsExtra = 0;
wcex.cbWndExtra = 0;
wcex.hInstance = hInstance;
wcex.hIcon = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_ACTIONX));
wcex.hCursor = LoadCursor(NULL, IDC_ARROW);
wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
wcex.lpszMenuName = MAKEINTRESOURCE(IDC_ACTIONX);
wcex.lpszClassName = szWindowClass;
wcex.hIconSm = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_SMALL));
return RegisterClassEx(&wcex);
}
//
// FUNCTION: InitInstance(HINSTANCE, int)
//
// PURPOSE: Saves instance handle and creates main window
//
// COMMENTS:
//
// In this function, we save the instance handle in a global variable and
// create and display the main program window.
//
BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
HWND hWnd;
hInst = hInstance; // Store instance handle in our global variable
hWnd = CreateWindow(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL);
if (!hWnd)
{
return FALSE;
}
ShowWindow(hWnd, nCmdShow);
UpdateWindow(hWnd);
BOOL result=InstallHook(hWnd);
return TRUE;
}
//
// FUNCTION: WndProc(HWND, UINT, WPARAM, LPARAM)
//
// PURPOSE: Processes messages for the main window.
//
// WM_COMMAND - process the application menu
// WM_PAINT - Paint the main window
// WM_DESTROY - post a quit message and return
//
//
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
int wmId, wmEvent;
PAINTSTRUCT ps;
HDC hdc;
//Global Mouse Move Handle
if(message==UWM_MOUSEMOVE){
MessageBox(
NULL,
(LPCWSTR)L"Resource not available\nDo you want to try again?",
(LPCWSTR)L"Account Details",
MB_ICONWARNING | MB_CANCELTRYCONTINUE | MB_DEFBUTTON2
);
return 0;
}
switch (message)
{
case WM_COMMAND:
wmId = LOWORD(wParam);
wmEvent = HIWORD(wParam);
// Parse the menu selections:
switch (wmId)
{
case IDM_ABOUT:
DialogBox(hInst, MAKEINTRESOURCE(IDD_ABOUTBOX), hWnd, About);
break;
case IDM_EXIT:
DestroyWindow(hWnd);
break;
case IDM_PLAY:
PlayMouse();
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
break;
case WM_PAINT:
hdc = BeginPaint(hWnd, &ps);
// TODO: Add any drawing code here...
EndPaint(hWnd, &ps);
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
return 0;
}
// Message handler for about box.
INT_PTR CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{
UNREFERENCED_PARAMETER(lParam);
switch (message)
{
case WM_INITDIALOG:
return (INT_PTR)TRUE;
case WM_COMMAND:
if (LOWORD(wParam) == IDOK || LOWORD(wParam) == IDCANCEL)
{
EndDialog(hDlg, LOWORD(wParam));
return (INT_PTR)TRUE;
}
break;
}
return (INT_PTR)FALSE;
}

Answer 1

Use WH_MOUSE hook to hook mouse messages only.
Few suggestions:
Ensure you hook installed successfully (SetWindowsHookEx returned non-NULL value)
Ensure messages delivered to hook procedure (Set breakpoint to these points or use trace functions)
You either need to send HWND of target window to the each process or send broadcast message
For Windows Vista and later processes with lower privileges cannot send messages to process with higher privileges. You need to use ChangeWindowMessageFilter to add necessary messages to the filter
Use PostMesssage instead of SendMessage, you don't need blocking calls here anyway

Answer 2

while defining a hook you have to provide the handle for the window for which you want to intercept the signal. Maybe passing handle of the desktop there can catch all the mouse event even outside the client window.