Keyboard hook (probably JNI realted) problem

I have written a C++ DLL to disable some specific function key. Then I wrote a Java application using JNI to call this DLL. The keyboard hook only works inside its function (that is from "void funx() {" to end of function "}" ). The keyboard hook no longer functions when DLL library function finish.
The DLL works perfectly fine when I can call the DLL library function from a C++ application. The keyboard hook disable some specfic key perfectly well (with the SetWindowsHookEx API).
Any help or suggestion are welcomed.
Thanks in advance for reading this post.

Hi wincoyu!
this isn't a reply, but a question :)
I'm working on a Java app running in bkground waiting a specific key to be pressed.Do you think i can use java methods to do this, and no DLLs ecc.?
If not, can you give me some tips for my work?
Thanks you, and excuse my bad english
Marco

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Hi Igor
The following program is the DLL part of the keyboard hooking.
The one I don't understand is how in [Q1] UWM_MOUSEMOVE_MSG is
defined as _T("UWM_MOUSEMOVE_MSG-44E531B1_14D3_11d5_A025_006067718D04").
Is it something I just have to remember? [Q1] is used in [Q2].
Regards
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++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
#include "stdafx.h"
#include <stdio.h>
#include <stdlib.h>
#include <Windows.h>
#include <WinUser.h>
//#define _COMPILING_44E531B1_14D3_11d5_A025_006067718D04
//#include "MouseHook.h"
#include <tchar.h>
#include <string.h>
[Q1] #define UWM_MOUSEMOVE_MSG _T("UWM_MOUSEMOVE_MSG-44E531B1_14D3_11d5_A025_006067718D04")//_T(.....)
HINSTANCE hInst;
UINT UWM_MOUSEMOVE;
HHOOK hook;
HWND hWndServer = NULL;
int gChong;
FILE *fp;
static LRESULT CALLBACK msghook(UINT nCode, WPARAM wParam, LPARAM lParam);
BOOL APIENTRY DllMain( HINSTANCE hInstance,
                       DWORD Reason,
                       LPVOID Reserved
*                                 clearMyHook
* Inputs:
*       HWND hWnd: Window hook
* Result: BOOL
*       TRUE if successful
* FALSE if error
* Effect:
*       Removes the hook that has been set
__declspec(dllexport) BOOL clearMyHook(HWND hWnd)
     if(hWnd != hWndServer || hWnd == NULL)
     return FALSE;
     BOOL unhooked = UnhookWindowsHookEx(hook);
     if(unhooked)
      hWndServer = NULL;
     return unhooked;
} // clearMyHook
*                                 setMyHook
* Inputs:
*       HWND hWnd: Window to notify
* Result: BOOL
*       TRUE if successful
* FALSE if error
* Effect:
*       Sets the hook
__declspec(dllexport) BOOL setMyHook(HWND &hWnd)
    printf("gChong = %d\n",gChong);//getchar();
    if(hWndServer != NULL)
      return FALSE; // already hooked!
     printf("GetModuleHandle(1): %d\n",GetModuleHandle(L"ahookDLL.dll"));
    //GetModuleHandle obtains a handle to a module loaded into
    //the calling process. In other examples. PCspeed.exe is not so
    //loaded - it is started as a separate process, by _spawnlp.
    hook = SetWindowsHookEx(WH_GETMESSAGE,
      (HOOKPROC)msghook,
     GetModuleHandle(L"ahookDLL.dll"),// hInst,
      0);
   if (hook==NULL){printf("error: %d\n",GetLastError());
      char dest[20];
      if(fopen_s(&fp,"jin.txt","w")==0){//successful. fp!=NULL.
         _itoa_s(GetLastError(),dest,sizeof(dest),10);
          fwrite(dest,sizeof(char),20, fp);
          fclose(fp);
   if(hook != NULL)
   { /* success */
      hWndServer = hWnd;
      printf("GetModuleHandle(2): %d\n",GetModuleHandle(L"ahookDLL.dll"));
      DllMain(GetModuleHandle(L"ahookDLL.dll"), DLL_PROCESS_ATTACH, NULL);
      return TRUE;
   } /* success */
   return FALSE; // failed to set hook
} // setMyHook
BOOL APIENTRY DllMain( HINSTANCE hInstance,
                       DWORD Reason,
                       LPVOID Reserved
    switch(Reason)
    { /* reason */
     case DLL_PROCESS_ATTACH:
       printf("GetModuleHandle(3): %d\n",GetModuleHandle(L"ahookDLL.dll"));
       hInst = hInstance;
[Q2] UWM_MOUSEMOVE = RegisterWindowMessage(UWM_MOUSEMOVE_MSG);
       return TRUE;
     case DLL_PROCESS_DETACH:
       if(hWndServer != NULL)
       clearMyHook(hWndServer);
       return TRUE;
    } /* reason */
    return TRUE;
*                                   msghook
* Inputs:
*       int nCode: Code value
* WPARAM wParam:
* LPARAM lParam:
* Result: LRESULT
*       Either 0 or the result of CallNextHookEx
* Effect:
*       Hook processing function. If the message is a mouse-move message,
*     posts the coordinates to the parent window
static LRESULT CALLBACK msghook(UINT nCode, WPARAM wParam, LPARAM lParam)
     static int x=0;
     if(nCode < 0)
     { /* pass it on */
       CallNextHookEx(hook, nCode, wParam, lParam);
        return 0;
     /* pass it on */
     LPMSG msg = (LPMSG)lParam;
     if(msg->message == WM_MOUSEMOVE ||
       msg->message == WM_NCMOUSEMOVE){
    //PostMessage(hWndServer, WM_LBUTTONUP, 0, 0);
        PostMessage(hWndServer, UWM_MOUSEMOVE, 0, 0);
       HDC hdc = GetDC(hWndServer);
        TextOut(hdc, x, x, L"msghook", 7); x=x+15;
        ReleaseDC(hWndServer, hdc);
       printf("msghook\n");
       if (fopen_s(&fp,"chong.txt","w")==0){//successful. fp!=NULL.
          fprintf_s( fp, "%s%c", "This is chong kim",'\n' );
          fclose(fp);
   if(msg->message == WM_CHAR){
    HDC hdc;
      wchar_t vkCode[8];//wchar_t is 2 bytes long
      static int y=0;
     if( memcpy_s(vkCode,4,&(msg->wParam),4)!=0){//failure. memcpy byte by byte.
        printf("memcpy_s failed\n");getchar();exit(0);
         //return CallNextHookEx(hook, nCode, wParam, lParam);
    hdc = GetDC(hWndServer);
    //TextOut(hdc, 10+y, 115,vkCode, 2);//Prints 2 wchar_t chars(4 bytes in total),
                                    //i.e. vkCode[0] and vkCode[1].
    TextOut(hdc, 10+y, 115, vkCode, 1);//Prints vkCode[0].
    y=y+15;
    ReleaseDC(hWndServer, hdc);
  return CallNextHookEx(hook, nCode, wParam, lParam);
} // msghook
Regards
Chong

On 1/27/2015 8:29 AM, "chong kyong kim" wrote:
The one I don't understand is how in [Q1] UWM_MOUSEMOVE_MSG is
defined as _T("UWM_MOUSEMOVE_MSG-44E531B1_14D3_11d5_A025_006067718D04").
It just needs to be a unique string - the actual value doesn't matter. Apparently, the author of the sample you are working off has generated a GUID in order to guarantee uniqueness. You should be using some other string, not the one used in the
sample (otherwise, your program may conflict with another program whose author blindly copied the same sample).
Igor Tandetnik

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Okay First we want to make a Low Level Hook right ...
So lets first set up a Global Hook ...
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#include<Windows.h>
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#include <stdio.h>
HHOOK hHock = NULL;
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printf("_a_");
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int main()
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Hello
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all is fine when i register hook from c++ application. strange things start to happen when the hook is registered inside jni.
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here is the code:
//dll loaded in jni function
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i have no idea what is wrong. please help.
Edited by: user3530356 on 2010-10-03 16:19

all is fine when i register hook from c++ application.What about when you register the hook from a DLL? A 32-bit DLL? a 64-bit DLL?
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Probably a battery problem...

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Take-apart pictoral here - link.
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Folks,
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Compaq CQ60-615Dx keyboard displays wrong key. Problem is only with the 2 w s and x keys.

Problem is only with 2 w s x keys. Tried updating BIOS and num lock suggestion. Looking for instruction for removing keyboard or any suggestions

Hi,
This may well be a Hardware issue with the keyboard itself, but re-seating the ribbon connection to the Motherboad and the keyboard is certainly worth trying.
The procedure to remove the keyboard is detailed starting on Page 56 of your Maintenance & Service Guide.
Regards,
DP-K
****Click the White thumb to say thanks****
****Please mark Accept As Solution if it solves your problem****
****I don't work for HP****
Microsoft MVP - Windows Experience

Keyboard hook (probably JNI realted) problem

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