主程序隐藏后全局钩子为什么无效

Question

    全局键盘钩子在主程序最小化的时候可以截取到键盘信息，可是如果主程序隐藏到系统托盘就失灵了是为什么。
以下是dll钩子源码：
// MouseClickDll.cpp : Defines the initialization routines for the DLL.
//#include "stdafx.h"
#include "MouseClickDll.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endifBEGIN_MESSAGE_MAP(CMouseClickDllApp, CWinApp)
//{{AFX_MSG_MAP(CMouseClickDllApp)
// NOTE - the ClassWizard will add and remove mapping macros here.
//    DO NOT EDIT what you see in these blocks of generated code!
//}}AFX_MSG_MAP
END_MESSAGE_MAP()
CMouseClickDllApp::CMouseClickDllApp()
{
// TODO: add construction code here,
// Place all significant initialization in InitInstance
}/////////////////////////////////////////////////////////////////////////////
// The one and only CMouseClickDllApp objectCMouseClickDllApp theApp;
//安装钩子
DllExport void WINAPI InstallLaunchEv()
{
if(Hook == NULL)
{
Init();
Hook=(HHOOK)SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)LauncherHook,theApp.m_hInstance,0);
//Hook=(HHOOK)SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)LauncherHook,GetModuleHandle(NULL),0);

}
/*if(MouseHook == NULL)
{
MouseHook = (HHOOK)SetWindowsHookEx(WH_MOUSE,(HOOKPROC)LauncherMouseHook,theApp.m_hInstance,0);
}*/
} //键盘钩子
LRESULT CALLBACK LauncherHook(int nCode,WPARAM wParam,LPARAM lParam)
{
MessageBeep(-1);
if(nCode >= HC_ACTION)
{
if(lParam < 0)
        {
char key[1];
key[0] = wParam;
if(key[0] == 123)
{
//GetCurrentPath();
//AfxMessageBox(CurrentPath);
if(!bIsRun){
bIsRun = TRUE;
CreateMyThread();
//AfxMessageBox("已开启");
}else
{
bIsRun = FALSE;
//AfxMessageBox("已停止");
}
}
if(key[0] == 122)
{
bIsRun = FALSE;
//AfxMessageBox("已停止");
}
}

}
return CallNextHookEx(Hook,nCode,wParam,lParam);
}
//鼠标钩子
LRESULT CALLBACK LauncherMouseHook(int nCode,WPARAM wParam,LPARAM lParam)
{
MessageBeep(-1);
return CallNextHookEx(Hook,nCode,wParam,lParam);
}
//建立线程
void CreateMyThread()
{
//AfxMessageBox(pFileName);
pThread = AfxBeginThread(MouseClick,(LPVOID)NULL);
}
//线程函数
UINT MouseClick(LPVOID pParam)
{
ReadCurrentPathFromReg();//从注册表中得到当前路径
ReadConfig();
OperationIndex = 0;
while(bIsRun && OperationIndex<OperationEndIndex)
{
switch(Operation[OperationIndex])
{
case DELAY_TIME:
Sleep(Operation[++OperationIndex]);
//AfxMessageBox("延时");
break;
case LEFT_MOUSEKEY_DOWN:
mouse_event(MOUSEEVENTF_LEFTDOWN,0,0,0,0);
//AfxMessageBox("按下");
break;
case LEFT_MOUSEKEY_UP:
mouse_event(MOUSEEVENTF_LEFTUP,0,0,0,0);
//AfxMessageBox("抬起");
break;
case RIGHT_MOUSEKEY_DOWN:
mouse_event(MOUSEEVENTF_RIGHTDOWN,0,0,0,0);
//AfxMessageBox("右键按下");
break;
case RIGHT_MOUSEKEY_UP:
mouse_event(MOUSEEVENTF_RIGHTUP,0,0,0,0);
//AfxMessageBox("右键抬起");
break;
case LOOP_START:
//AfxMessageBox("循环开始");
break;
case LOOP_END:
OperationIndex = LoopStartIndex;
//AfxMessageBox("循环结束");
break;
case KEY_DOWN:
keybd_event(Operation[++OperationIndex],0,0,0);
break;
case KEY_UP:
keybd_event(Operation[++OperationIndex],0,KEYEVENTF_KEYUP,0); 
break;
}
OperationIndex++;
//Sleep(2000);


//AfxMessageBox(CString(*a)); }
return TRUE;
}//存按键日志
void SaveLog(char* c)
{
CTime tm=CTime::GetCurrentTime();
CString name;
name.Format(CurrentPath+"key_%d_%d.log",tm.GetMonth(),tm.GetDay());
CFile file;
if(!file.Open(name,CFile::modeReadWrite))
{
file.Open(name,CFile::modeCreate|CFile::modeReadWrite);
}
file.SeekToEnd();
file.Write(c,1);
file.Close();
}
//读取配制文件
void ReadConfig()
{
CString strLine;
CStdioFile csFile;
CString cp = CurrentPath+"config.txt";
memcpy(pFileName,cp,cp.GetLength());
TRY    
{    
csFile.Open(pFileName,CFile::modeRead);    
}CATCH(CFileException, e)
{    
csFile.Abort();    
THROW_LAST();  
}END_CATCH
csFile.SeekToBegin();
while(csFile.ReadString(strLine))
{
if(strLine.Find("DelayTime:") != -1)//延时
{
int pos = strLine.ReverseFind(':');
strLine = strLine.Right(strLine.GetLength() - pos - 1);
Operation[OperationIndex] = DELAY_TIME;
OperationIndex++;
Operation[OperationIndex] = atoi(strLine);
}else if(strLine.Find("LeftMouseKeyDown") != -1)//左键按下
{
Operation[OperationIndex] = LEFT_MOUSEKEY_DOWN;
}else if(strLine.Find("LeftMouseKeyUp") != -1)//左键抬起
{
Operation[OperationIndex] = LEFT_MOUSEKEY_UP;
}else if(strLine.Find("RightMouseKeyDown") != -1)//右键按下
{
Operation[OperationIndex] = RIGHT_MOUSEKEY_DOWN;
}else if(strLine.Find("RightMouseKeyUp") != -1)//右键抬起
{
Operation[OperationIndex] = RIGHT_MOUSEKEY_UP;
}else if(strLine.Find("<loop>") != -1)//循环开始
{
Operation[OperationIndex] = LOOP_START;
LoopStartIndex = OperationIndex;
}else if(strLine.Find("</loop>") != -1)//循环结束
{
Operation[OperationIndex] = LOOP_END;
LoopEndIndex = OperationIndex;
}else if(strLine.Find("KeyDown") != -1)//键盘按键按下
{
int pos = strLine.ReverseFind(':');
strLine = strLine.Right(strLine.GetLength() - pos - 1);
Operation[OperationIndex] = KEY_DOWN;
OperationIndex++;
Operation[OperationIndex] = atoi(strLine);
}else if(strLine.Find("KeyUp") != -1)//键盘按键抬起
{
int pos = strLine.ReverseFind(':');
strLine = strLine.Right(strLine.GetLength() - pos - 1);
Operation[OperationIndex] = KEY_UP;
OperationIndex++;
Operation[OperationIndex] = atoi(strLine);
}
OperationIndex++;
}
OperationEndIndex = OperationIndex;
csFile.Close();
}

Answer 1

//初始化
void Init()
{
GetCurrentPath();
WriteCurrentPathToReg();
//ReadConfig();
//ReadCurrentPathFromReg();
//AfxMessageBox(pFileName);
}
//得到当前路径
void GetCurrentPath()
{
TCHAR szFilePath[MAX_PATH + 1];
GetModuleFileName(NULL, szFilePath, MAX_PATH);
(_tcsrchr(szFilePath, _T('\\')))[1] = 0;
CurrentPath=szFilePath;
}//添加当前路径到注册表
void WriteCurrentPathToReg()
{ HKEY hKey;//定义有关的hKey,在查询结束时要关闭
HKEY hKey1;//新建项HKEY
//打开与路径 DataSet相关的hKey
LPCTSTR DataSet="Software\\MouseClick";

//新建项
::RegCreateKey(HKEY_CURRENT_USER,DataSet,&hKey1);
::RegCloseKey(hKey1);

//访问注册表，hKey则保存此函数所打开的键的句柄
long ret0=(::RegOpenKeyEx(HKEY_CURRENT_USER,DataSet,0,KEY_WRITE,&hKey));
if(ret0!=ERROR_SUCCESS)//如果无法打开hKEY,则中止程序的执行
{
AfxMessageBox("错误：无法打开有关的hKEY");
return;
} //设置有关的数据
LPBYTE cp = CString_To_LPBYTE(CurrentPath);//当前路径
DWORD DataType = REG_SZ;//数据类型
DWORD DataLength = MAX_PATH;//数据长度 long ret1=::RegSetValueEx(hKey,"CurrentPath",NULL,DataType,cp,DataLength);
if(ret1!=ERROR_SUCCESS)
{
AfxMessageBox("错误：无法设置有关的注册表信息");
return;
} //程序结束，关闭打开的hKEY
::RegCloseKey(hKey);
}
//从注册表读取当前路径
void ReadCurrentPathFromReg()
{
HKEY hKey;//定义有关的hKey,在查询结束时要关闭 //打开与路径 DataSet相关的hKey
LPCTSTR DataSet="Software\\MouseClick";

//访问注册表，hKey则保存此函数所打开的键的句柄
long ret0=(::RegOpenKeyEx(HKEY_CURRENT_USER,DataSet,0,KEY_READ,&hKey));
if(ret0!=ERROR_SUCCESS)//如果无法打开hKEY,则中止程序的执行
{
AfxMessageBox("错误：无法打开有关的hKEY");
return;
} LPBYTE cp = new BYTE[MAX_PATH];//当前路径
DWORD DataType = REG_SZ;//数据类型
DWORD DataLength = MAX_PATH;//数据长度
long ret2=::RegQueryValueEx(hKey,"CurrentPath",NULL,&DataType,cp,&DataLength);
if(ret2!=ERROR_SUCCESS)
{
AfxMessageBox("错误：无法查询有关的注册表信息");
return;
}
CurrentPath = CString(cp);
//AfxMessageBox(CurrentPath);
::RegCloseKey(hKey);
}LPBYTE CString_To_LPBYTE(CString str)
{
LPBYTE lpb=new BYTE[str.GetLength()+1];
for(int i=0;i<str.GetLength();i++)
lpb[i]=str[i];
lpb[str.GetLength()]=0;
return lpb;
}//退出
DllExport void WINAPI ExitMouseClick()
{
bIsRun = FALSE;
pThread = NULL;
UnhookWindowsHookEx(Hook);
Hook = NULL;
UnhookWindowsHookEx(MouseHook);
MouseHook = NULL;
}

Answer 2

以下是主程序源码：// MouseHookAppDlg.cpp : implementation file
//#include "stdafx.h"
#include "MouseHookApp.h"
#include "MouseHookAppDlg.h"
#include "MouseClickDll.h"#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif/////////////////////////////////////////////////////////////////////////////
// CAboutDlg dialog used for App Aboutclass CAboutDlg : public CDialog
{
public:
CAboutDlg();// Dialog Data
//{{AFX_DATA(CAboutDlg)
enum { IDD = IDD_ABOUTBOX };
//}}AFX_DATA // ClassWizard generated virtual function overrides
//{{AFX_VIRTUAL(CAboutDlg)
protected:
virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support
//}}AFX_VIRTUAL// Implementation
protected:
//{{AFX_MSG(CAboutDlg)
//}}AFX_MSG
DECLARE_MESSAGE_MAP()
};CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)
{
//{{AFX_DATA_INIT(CAboutDlg)
//}}AFX_DATA_INIT
}void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{
CDialog::DoDataExchange(pDX);
//{{AFX_DATA_MAP(CAboutDlg)
//}}AFX_DATA_MAP
}    
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)
//{{AFX_MSG_MAP(CAboutDlg)
// No message handlers
//}}AFX_MSG_MAP
END_MESSAGE_MAP()
//最小化到系统工具栏
void CMouseHookAppDlg::toTray() 
{
NOTIFYICONDATA nid;
nid.cbSize=(DWORD)sizeof(NOTIFYICONDATA);
nid.hWnd=this->m_hWnd;
nid.uID=IDR_MAINFRAME;
nid.uFlags=NIF_ICON|NIF_MESSAGE|NIF_TIP ;
nid.uCallbackMessage=WM_SHOWTASK;//自定义的消息名称
nid.hIcon=LoadIcon(AfxGetInstanceHandle(),MAKEINTRESOURCE(IDR_MAINFRAME)); 
strcpy(nid.szTip,"MouseHook"); //信息提示条为MouseHook
Shell_NotifyIcon(NIM_ADD,&nid); //在托盘区添加图标 
ShowWindow(SW_HIDE); //隐藏主窗口 
}//删除系统工具栏
void CMouseHookAppDlg::DeleteTray()
{
NOTIFYICONDATA nid;
nid.cbSize=(DWORD)sizeof(NOTIFYICONDATA);
nid.hWnd=this->m_hWnd;
nid.uID=IDR_MAINFRAME;
nid.uFlags=NIF_ICON|NIF_MESSAGE|NIF_TIP ;
nid.uCallbackMessage=WM_SHOWTASK;//自定义的消息名称   
nid.hIcon=LoadIcon(AfxGetInstanceHandle(),MAKEINTRESOURCE(IDR_MAINFRAME));
strcpy(nid.szTip,"MouseHook");    //信息提示条为 MouseHook   
Shell_NotifyIcon(NIM_DELETE,&nid);    //在托盘区删除图标 
}//显示系统工具栏菜单
LRESULT CMouseHookAppDlg::onShowTask(WPARAM wParam,LPARAM lParam)//wParam接收的是图标的ID，而lParam接收的是鼠标的行为  
{   
if((UINT)wParam!=IDR_MAINFRAME)
return   1;   
switch(lParam)
{
case WM_RBUTTONUP://右键起来时弹出快捷菜单，这里只有一个 关闭
{
LPPOINT lpoint = new tagPOINT;   
::GetCursorPos(lpoint);//得到鼠标位置   
CMenu menu;   
menu.CreatePopupMenu();//声明一个弹出式菜单   
//增加菜单项 关闭，点击则发送消息WM_DESTROY给主窗口（已隐藏），将程序结束。   
menu.AppendMenu(MF_STRING,WM_DESTROY,"关闭");     
//确定弹出式菜单的位置   
menu.TrackPopupMenu(TPM_LEFTALIGN,lpoint->x,lpoint->y,this);   
//资源回收   
HMENU hmenu=menu.Detach();   
menu.DestroyMenu();   
delete lpoint;   
}   
break;   
case WM_LBUTTONDBLCLK://双击左键的处理   
{    
this->ShowWindow(SW_SHOW);//简单的显示主窗口完事儿
DeleteTray();    
}
break;   
}   
return 0;
}

Answer 3

/////////////////////////////////////////////////////////////////////////////
// CMouseHookAppDlg dialogCMouseHookAppDlg::CMouseHookAppDlg(CWnd* pParent /*=NULL*/)
: CDialog(CMouseHookAppDlg::IDD, pParent)
{
//{{AFX_DATA_INIT(CMouseHookAppDlg)
// NOTE: the ClassWizard will add member initialization here
//}}AFX_DATA_INIT
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}void CMouseHookAppDlg::DoDataExchange(CDataExchange* pDX)
{
CDialog::DoDataExchange(pDX);
//{{AFX_DATA_MAP(CMouseHookAppDlg)
// NOTE: the ClassWizard will add DDX and DDV calls here
//}}AFX_DATA_MAP
}BEGIN_MESSAGE_MAP(CMouseHookAppDlg, CDialog)
//{{AFX_MSG_MAP(CMouseHookAppDlg)
ON_WM_SYSCOMMAND()
ON_WM_PAINT()
ON_WM_QUERYDRAGICON()
ON_MESSAGE(WM_SHOWTASK,onShowTask)
//}}AFX_MSG_MAP
END_MESSAGE_MAP()/////////////////////////////////////////////////////////////////////////////
// CMouseHookAppDlg message handlersBOOL CMouseHookAppDlg::OnInitDialog()
{
CDialog::OnInitDialog(); // Add "About..." menu item to system menu. // IDM_ABOUTBOX must be in the system command range.
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
ASSERT(IDM_ABOUTBOX < 0xF000); CMenu* pSysMenu = GetSystemMenu(FALSE);
if (pSysMenu != NULL)
{
CString strAboutMenu;
strAboutMenu.LoadString(IDS_ABOUTBOX);
if (!strAboutMenu.IsEmpty())
{
pSysMenu->AppendMenu(MF_SEPARATOR);
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
}
} // Set the icon for this dialog.  The framework does this automatically
//  when the application's main window is not a dialog
SetIcon(m_hIcon, TRUE); // Set big icon
SetIcon(m_hIcon, FALSE); // Set small icon

// TODO: Add extra initialization here

return TRUE;  // return TRUE  unless you set the focus to a control
}void CMouseHookAppDlg::OnSysCommand(UINT nID, LPARAM lParam)
{
if ((nID & 0xFFF0) == IDM_ABOUTBOX)
{
CAboutDlg dlgAbout;
dlgAbout.DoModal();
}
else
{
CDialog::OnSysCommand(nID, lParam);
}
}// If you add a minimize button to your dialog, you will need the code below
//  to draw the icon.  For MFC applications using the document/view model,
//  this is automatically done for you by the framework.void CMouseHookAppDlg::OnPaint() 
{
if (IsIconic())
{
CPaintDC dc(this); // device context for painting SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); // Center icon in client rectangle
int cxIcon = GetSystemMetrics(SM_CXICON);
int cyIcon = GetSystemMetrics(SM_CYICON);
CRect rect;
GetClientRect(&rect);
int x = (rect.Width() - cxIcon + 1) / 2;
int y = (rect.Height() - cyIcon + 1) / 2; // Draw the icon
dc.DrawIcon(x, y, m_hIcon);
}
else
{
CDialog::OnPaint();
}
}// The system calls this to obtain the cursor to display while the user drags
//  the minimized window.
HCURSOR CMouseHookAppDlg::OnQueryDragIcon()
{
return (HCURSOR) m_hIcon;
}void CMouseHookAppDlg::OnOK() 
{ /*
// TODO: Add extra validation here
InstallLaunchEv();
//CDialog::ShowWindow(SW_HIDE);
CDialog::ShowWindow(SW_SHOWMINIMIZED);
CDialog::HideCaret();
//CDialog::OnOK();
*/
toTray();}void CMouseHookAppDlg::OnCancel() 
{
// TODO: Add extra cleanup here
ExitMouseClick();
CDialog::OnCancel();
}