C # Use global hooks

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Using system; Using system. Collections. Generic; Using system. componentmodel; Using system. Data; Using system. drawing; Using system. text; Using system. reflection; Using system. runtime. interopservices; Using system. Windows. forms; Namespace wa_hooktest { Public partial class form1: Form { Public form1 () { Initializecomponent (); } Internal Enum hooktype // enumeration, hook type { // Msgfilter =-1, // Journalrecord = 0, // Journalplayback = 1, Keyboard = 2, // Getmessage = 3, // CALLWNDPROC = 4, // CBT = 5, // Sysmsgfilter = 6, // Mouse = 7, // Hardware = 8, // DEBUG = 9, // Shell = 10, // Foregroundidle = 11, // Callwndprocret = 12, Keyboardll = 13, // Mousell = 14, }; [Dllimport ("kernel32.dll")] Static extern int getcurrentthreadid (); // obtain the ID of the current thread [Dllimport ("user32.dll")] Internal extern static void unhookwindowshookex (intptr handle); // cancel the HOOK API [Dllimport ("user32.dll")] Internal extern static intptr setwindowshookex (INT idhook, [financialas (unmanagedtype. functionptr)] hookproc lpfn, intptr hinstance, int threadid); // sets the HOOK API [Dllimport ("user32.dll")] Internal extern static intptr callnexthookex (intptr handle, int code, intptr wparam, intptr lparam); // obtain the next HOOK API Intptr _ nexthookptr; // record the hook number Public Delegate intptr hookproc (INT code, intptr wparam, intptr lparam ); Public intptr myhookproc (INT code, intptr wparam, intptr lparam) { If (Code <0) { Return callnexthookex (_ nexthookptr, code, wparam, lparam ); } // Return, let the subsequent program process the message If (wparam. toint32 () = 98 | wparam. toint32 () = 66) {// If the user inputs B This. textbox1.text = ""; Return (intptr) 1; // The message is returned directly, and the processing is complete. } Else { Return intptr. Zero; // return, let the subsequent program process the message } // If (wparam. toint32 () = 91) //{ // Return (intptr) 1; //} // Else { // Return intptr. zero; //} } Public void sethook () { If (_ nexthookptr! = Intptr. Zero) // already checked Return; // Thread hook Hookproc myhookproc = new hookproc (myhookproc); // declare a delegate object of your own hook implementation function // _ Nexthookptr = setwindowshookex (INT) hooktype. keyboard, myhookproc, intptr. Zero, getcurrentthreadid (); // Add it to the hook chain // Global hook _ Nexthookptr = setwindowshookex (INT) hooktype. keyboardll, myhookproc, Marshal. gethinstance (assembly. getexecutingassembly (). getmodules () [0]), 0); // Add it to the hook chain MessageBox. Show (_ nexthookptr. tostring ()); } Public void unhook () { If (_ nexthookptr! = Intptr. Zero) { Unhookwindowshookex (_ nexthookptr); // cancel from the hook chain _ Nexthookptr = intptr. zero; } } Private void form1_load (Object sender, eventargs E) { Sethook (); } Private void form=formclosing (Object sender, formclosingeventargs E) { Unhook (); } } }

The above procedures do not get hooks. The following are corrected:

Problem points:50 Replies:5 Show all repliesShow star repliesShow landlord reply Modify, delete, report, reference, and reply

Posted on:2008-03-28 09:58:531Floor score:50 There are many similar problems. If you don't want to explain any problem, just send the code... Create a form4 form. Add two buttons and add events .. Then copy the code In fact, the difference is the red area. Using system; Using system. Collections. Generic; Using system. componentmodel; Using system. Data; Using system. drawing; Using system. text; Using system. Windows. forms; Using system. runtime. interopservices; Using system. reflection; Using system. diagnostics; Namespace windowsapplication1 { /// <Summary> /// Description of mainform. /// </Summary> Public partial class form4: Form { // Delegate Public Delegate int hookproc (INT ncode, int wparam, intptr lparam ); Static int hhook = 0; Public const int wh_keyboard_ll = 13; // The lowlevel keyboard is intercepted. If it is wh_keyboard = 2, it cannot intercept the system keyboard. Acrobat Reader will obtain the keyboard before you intercept it. Hookproc keyboardhookprocedure; // Keyboard hook Structure Function [Structlayout (layoutkind. Sequential)] Public class keyboardhookstruct { Public int vkcode; Public int scancode; Public int flags; Public int time; Public int dwextrainfo; } # Region dllimport // Set the hook [Dllimport ("user32.dll")] Public static extern int setwindowshookex (INT idhook, hookproc lpfn, intptr hinstance, int threadid ); [Dllimport ("user32.dll", charset = charset. Auto, callingconvention = callingconvention. stdcall)] // Remove the hook Public static extern bool unhookwindowshookex (INT idhook ); [Dllimport ("user32.dll")] // Call the next hook Public static extern int callnexthookex (INT idhook, int ncode, int wparam, intptr lparam ); [Dllimport ("kernel32.dll")] Public static extern int getcurrentthreadid (); [Dllimport ("kernel32.dll")] Public static extern intptr getmodulehandle (string name ); # Endregion # Region custom events Public void hook_start () { // Install the keyboard hook If (hhook = 0) { Keyboardhookprocedure = new hookproc (keyboardhookproc ); // Hhook = setwindowshookex (2, // Keyboardhookprocedure, // Getmodulehandle (process. getcurrentprocess (). mainmodule. modulename), getcurrentthreadid ()); Hhook = setwindowshookex (wh_keyboard_ll, Keyboardhookprocedure, Getmodulehandle (process. getcurrentprocess (). mainmodule. modulename), 0 ); // If the hook fails to be set. If (hhook = 0) { Hook_clear (); // Throw new exception ("hook setting failed! "); } } } // Cancel the hook event Public void hook_clear () { Bool retkeyboard = true; If (hhook! = 0) { Retkeyboard = unhookwindowshookex (hhook ); Hhook = 0; } // If you fail to remove the hook. If (! Retkeyboard) throw new exception ("unhookwindowshookex failed ."); } // Add the desired information here Public static int keyboardhookproc (INT ncode, int wparam, intptr lparam) { If (ncode> = 0) { Keyboardhookstruct KBH = (keyboardhookstruct) Marshal. ptrtostructure (lparam, typeof (keyboardhookstruct )); If (KBH. vkcode = (INT) keys. S & (INT) control. modifierkeys = (INT) keys. Control) // intercept F8 { MessageBox. Show ("the shortcut key has been intercepted! Cannot be saved! "); Return 1; } If (KBH. vkcode = (INT) keys. Y & (INT) control. modifierkeys = (INT) keys. Control + (INT) keys. alt) // CTRL + ALT + Y { // MessageBox. Show ("cannot be saved all! "); Return 1; } If (KBH. vkcode = (INT) keys. X) { MessageBox. Show ("cannot be saved all! "); Return 1; } } Return callnexthookex (hhook, ncode, wparam, lparam ); } # Endregion Public form4 () { Initializecomponent (); } Private void button#click (Object sender, eventargs E) { Hook_start (); } Private void button2_click (Object sender, eventargs E) { Hook_clear (); } } }