鼠标钩子--- 悬浮窗口

MouseHook.dll

MouseHook.h

#pragma once

/*global*/
 extern DWORD g_dwThreadId;
 extern HINSTANCE g_Hinstance;
 extern HHOOK g_MouseHook;
 extern POINT g_ptOld;

/*define*/
#define WM_MOUSEMOVE_ALL WM_USER+1000

/*export*/
 extern "C" __declspec(dllexport) BOOL SetHook(DWORD dwThreadId);

 LRESULT CALLBACK MouseProc(
     __in  int nCode,
    __in  WPARAM wParam,
    __in  LPARAM lParam
    );

MouseHook.cpp

#include "stdafx.h"
#include "MouseHook.h"

#pragma data_seg("GlobalData")
DWORD g_dwThreadId = 0;
#pragma data_seg()
#pragma comment(linker, "/SECTION:GlobalData,RWS")
HINSTANCE g_Hinstance = NULL;
HHOOK g_MouseHook = NULL;
POINT g_ptOld;

BOOL SetHook(DWORD dwThreadId)
{
    if ( dwThreadId <= 0 )
        return FALSE;

    g_MouseHook = ::SetWindowsHookEx(WH_MOUSE, (HOOKPROC)MouseProc, g_Hinstance, 0);
    if ( NULL == g_MouseHook )
        return FALSE;
    
    g_dwThreadId = dwThreadId;
    return TRUE;
}

LRESULT CALLBACK MouseProc(
    __in  int nCode,
    __in  WPARAM wParam,
    __in  LPARAM lParam
    )
{
    LRESULT lResult = ::CallNextHookEx(g_MouseHook, nCode, wParam, lParam);
    if ( g_dwThreadId > 0 )
    {
        POINT pt;
        ::GetCursorPos(&pt);
        if ( pt.x != g_ptOld.x && pt.y != g_ptOld.y )
        {
            ::PostThreadMessage(g_dwThreadId, WM_MOUSEMOVE_ALL, 0, MAKELPARAM(pt.x, pt.y));
            g_ptOld.x = pt.x;
            g_ptOld.y = pt.y;
        }
    }
    return lResult;
}

dllmain.cpp

#include "stdafx.h"
#include "MouseHook.h"

BOOL APIENTRY DllMain( HMODULE hModule,
                       DWORD  ul_reason_for_call,
                       LPVOID lpReserved
                     )
{
    g_Hinstance = (HINSTANCE)hModule;
    g_ptOld.x = 0;
    g_ptOld.y = 0;

    return TRUE;
}

HangWnd

HangWnd.cpp(App)

BOOL CHangWndApp::InitInstance()
{
    // InitCommonControlsEx() is required on Windows XP if an application
    // manifest specifies use of ComCtl32.dll version 6 or later to enable
    // visual styles.  Otherwise, any window creation will fail.
    INITCOMMONCONTROLSEX InitCtrls;
    InitCtrls.dwSize = sizeof(InitCtrls);
    // Set this to include all the common control classes you want to use
    // in your application.
    InitCtrls.dwICC = ICC_WIN95_CLASSES;
    InitCommonControlsEx(&InitCtrls);

    CWinApp::InitInstance();


    AfxEnableControlContainer();


    HMODULE hModule = ::LoadLibrary(_T("../Debug/MouseHook.dll"));
    if ( NULL == hModule )
        return FALSE;

    typedef BOOL (*SETHOOK)(DWORD dwThreadId);
    SETHOOK SetHook = (SETHOOK)::GetProcAddress(hModule, "SetHook");
    if ( SetHook )
    {
        DWORD dwThreadId = ::GetCurrentThreadId();
        SetHook(dwThreadId);
    }

    CHangWndDlg dlg;
    m_pMainWnd = &dlg;
    INT_PTR nResponse = dlg.DoModal();

    ::FreeLibrary(hModule);
    hModule = NULL;


    // Since the dialog has been closed, return FALSE so that we exit the
    //  application, rather than start the application's message pump.
    return FALSE;
}

HangWndDlg.h

class CHangWndDlg : public CDialogEx
{
// Construction
public:
    CHangWndDlg(CWnd* pParent = NULL);    // standard constructor

private:
    BOOL m_bIsWindowVisible;
};

HangWndDlg.cpp

#define WM_MOUSEMOVE_ALL WM_USER+1000

CHangWndDlg::CHangWndDlg(CWnd* pParent /*=NULL*/)
    : CDialogEx(CHangWndDlg::IDD, pParent)
{
    m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
    m_bIsWindowVisible = TRUE;
}

BOOL CHangWndDlg::PreTranslateMessage(MSG* pMsg)
{
    if ( pMsg->message == WM_MOUSEMOVE_ALL )
    {
        POINT pt;
        pt.x = LOWORD(pMsg->lParam);
        pt.y = HIWORD(pMsg->lParam);

        CRect rcWnd;
        GetWindowRect(&rcWnd);

        int nWidth = rcWnd.Width();
        int nHeight = rcWnd.Height();

        if ( rcWnd.left <= 20 )
        {
            if ( m_bIsWindowVisible )
            {
                BOOL bPtInRect = rcWnd.PtInRect(pt);
                if ( !bPtInRect )
                {
                    for ( int i = 0; i < nWidth; i++ )
                    {
                        SetWindowPos(&CWnd::wndNoTopMost, 0, rcWnd.top, nWidth-i, nHeight, SWP_SHOWWINDOW);
                    }
                    SetWindowPos(&CWnd::wndNoTopMost, 0, rcWnd.top, nWidth, nHeight, SWP_HIDEWINDOW);
                    m_bIsWindowVisible = FALSE;
                }
            }
        }

        if ( !m_bIsWindowVisible && pt.x < 10 )
        {
            for ( int i = 0; i < nWidth; i++ )
            {
                SetWindowPos(&CWnd::wndNoTopMost, 0, rcWnd.top, 0+i, nHeight, SWP_SHOWWINDOW);
            }
            m_bIsWindowVisible = TRUE;
        }
    }
    return CDialogEx::PreTranslateMessage(pMsg);
}