C / C++ / MFC

Re: setting up a keyboard system wide hook (contains the code, if you would like to see it...)

9-Jan-03 5:00

Hello,

INTRODUCTION:
1. I'm trying to install a system wide keyboard hook in order to avoid some keystrokes.
2. I've implemented that static callback f(x) inside a DLL.
3. I call the DLL exported function from a service.
4. I'm sure that the service works right. (it's a SERVICE_WIN32_OWN_PROCESS service).
5. It seems that the callback function that has the hook it's called only one time!.

PROTOTYPE:
static LRESULT CALLBACK HookTeclatLL(int nCode,WPARAM wParam,LPARAM lParam);

CALL
hHookTeclat = SetWindowsHookEx(WH_KEYBOARD_LL, HookTeclatLL, hInstDLLSCT, NULL);
return (hHookTeclat != NULL); <code>the return value is not NULL</code>

CODE:
static LRESULT CALLBACK HookTeclatLL(int nCode,WPARAM wParam,LPARAM lParam)
{
  if (nCode == HC_ACTION)
  {
    switch (wParam)
    {
      case WM_KEYDOWN:
      case WM_SYSKEYDOWN:
      case WM_KEYUP:
      case WM_SYSKEYUP:
      {
        LPKBDLLHOOKSTRUCT p = (LPKBDLLHOOKSTRUCT)lParam;
        bool bDeleteKey = false;

        bDeleteKey =  ((p->vkCode == VK_RWIN) ||
                      (p->vkCode == VK_LWIN) ||
                      (p->vkCode == VK_ESCAPE) ||
                      (p->vkCode == VK_F1) || 
                      (p->vkCode == VK_F2) || 
                      (p->vkCode == VK_F3) || 
                      (p->vkCode == VK_F4) || 
                      (p->vkCode == VK_F5) || 
                      (p->vkCode == VK_F6) || 
                      (p->vkCode == VK_F7) || 
                      (p->vkCode == VK_F8) || 
                      (p->vkCode == VK_F9) || 
                      (p->vkCode == VK_F10) || 
                      (p->vkCode == VK_F11) || 
                      (p->vkCode == VK_F12) || 
                      (p->vkCode == VK_CANCEL) ||
                      (p->vkCode == VK_RBUTTON) || 
                      (p->vkCode == VK_PAUSE) ||
                      (p->vkCode == VK_SNAPSHOT) ||
                      (p->vkCode == VK_APPS) ||
                      (p->vkCode == VK_SCROLL));

        if (!bDeleteKey)
        {
          if ((p->flags & LLKHF_ALTDOWN) != 0)
          {
            bDeleteKey = (p->vkCode == VK_TAB);
          }

          if ((p->flags & MOD_WIN) != 0)
          {
            bDeleteKey = true;
          }
        }

        if (bDeleteKey) 
        {
          logEstat("\nELIMINANT\n");  <code>In order to monitor only</code>
          MessageBox(NULL,"ELIMINANT","",MB_SERVICE_NOTIFICATION); <code>In order to monitor only</code>
          return 1; <code>this should remove the key pressed...</code>
        }

        break;
      }
    }
  }

  return CallNextHookEx(hHookTeclat, nCode, wParam, lParam);
}

Do you know anything that I'm missing or that I have misunderstood or something?

The problems are:
1. I think that only one time its called that static callback f(x).
2. the keys are not removed.
3. It seems that the messageboxes never appear... even with the MB_SERVICE_NOTIFICATION...

Thank you in advance.

Joan M9-Jan-03 5:15

9-Jan-03 5:15

I have figured it out...

The service must be interactive in order to be able to install a keyboard hook.

NT Services and MFC

henrik_stromberg9-Jan-03 4:49

henrik_stromberg

9-Jan-03 4:49

I have a problem when i create a NT Service that is based on a MFC SDI application.
The application uses the CNTService from the sample from Nigel Thompson.
The problem is that i can't get the GUI to work correct and the GUI are not shown when I log on to my computer.

Re: NT Services and MFC

Joan M9-Jan-03 5:03

Locking toolbars/control bars?

9-Jan-03 5:03

I'm new to services, but have you set m_dwServiceType to SERVICE_INTERACTIVE_PROCESS?

Hope this helps.

Re: NT Services and MFC

henrik_stromberg9-Jan-03 20:38

henrik_stromberg

9-Jan-03 20:38

I allready have this flag set so that dosen't help.

Re: NT Services and MFC

Carlos Antollini9-Jan-03 5:06

Carlos Antollini

9-Jan-03 5:06

You must to set the service in Interactive mode.

Best Regards.

Carlos Antollini.
Pi Five[^]Creator

Sonork ID 100.10529 cantollini

Chris Hambleton9-Jan-03 3:57

Chris Hambleton

9-Jan-03 3:57

Hi,

How can I "lock" toolbars and controlbars in place in an application, so the user can resize them, but cannot move them around?

Thanks!

"No one goes to hell because of their sin, but because of rejecting God's method of salvation: His Son's life for yours..."

"It does not take a majority to prevail ... but rather an irate, tireless minority, keen on setting brushfires of freedom in the minds of men." --Samuel Adams

DAO DLLs

Anthony B.9-Jan-03 3:42

Anthony B.

9-Jan-03 3:42

I have to use an application that uses DAO interface
on a machine (WINNT 4.0) where Access is not installed.

What have I to do in order to let this application work ??

I know that DAO350.DLL and/or DAO360.DLL files must be installed
in the machine, but, is required only files presence or they
must be registerd in the system registry ??

How can I install that DLLs ???

Thank a lot !!!!

Re: DAO DLLs

Carlos Antollini9-Jan-03 5:11

Carlos Antollini

9-Jan-03 5:11

NO, you need a list of several libraries, like jet librarys, error librarys, etc.

Check in your last cd of the Visual Studio 6.0, you will can find the Dao SDK,
into it you will can find a simple installer for dao libraries. I don't remember the name of the package y remmber that have a size of 4 or 5 MB...

Best Regards

Carlos Antollini.
Pi Five[^]Creator

Sonork ID 100.10529 cantollini

Pointer to multi-dimensional array?

Dominik Reichl9-Jan-03 3:40

Dominik Reichl

9-Jan-03 3:40

Hello,

I have a problem with pointers.

I want to convert a static array to a dynamically created one. With one dimension, this is easy:

unsigned char array[8000];

would be

unsigned char *array = NULL;
...
array = new unsigned char[8000];
...
delete []array; array = NULL;

This is easy. But how do I convert a static array which has
more than one dimension, lets say 2?

unsigned char array[100][100];

would be what?

-Dominik

Re: Pointer to multi-dimensional array?

AlexO9-Jan-03 3:56

Re: Pointer to multi-dimensional array?

9-Jan-03 3:56

depends:

1. //unsigned char array[100][100];
unsigned char** array = new char [100][100];
...
delete []array; array = NULL;

2. //unsigned char array[100][100];
unsigned char** array = new char* [100];
for(int i = 0; i < 100;++i)
array[i] = new char[100];

...
for(int i = 0; i < 100;++i)
delete[] array[i];
delete []array; array = NULL;

Dominik Reichl9-Jan-03 4:21

Dominik Reichl

9-Jan-03 4:21

Works

Thank you very much!!!
-Dominik

amutithreads server

smallcoder9-Jan-03 2:27

smallcoder

9-Jan-03 2:27

imagine you are coding amutithreads server so all client you create a socket and a new threads to handle the connexion
so imagine that your program is a chat program.
my problem is that i would like to know how can you do for the public message.Indeed one of your threads migth receive a message and how can you talk to other threads containig the connexion , to send the message to ii socket.
So that all other client will receive the message reacieved by this thread's connexion.

if you think that you can't , that means that you can : if you understand this there youn can

PostThreadMessage?

AlexO9-Jan-03 4:30

9-Jan-03 4:30

::PostThreadMessage

smallcoder9-Jan-03 4:59

smallcoder

9-Jan-03 4:59

please can you be more relevant please i'm so confious may be a piece of code

if you think that you can't , that means that you can : if you understand this there youn can

AlexO9-Jan-03 5:35

9-Jan-03 5:35

MSDN : MultiSoc : Illustrates Using Sockets in Multiple Threads

MSDN(SDK) : Power Outlets in Action: Windows Sockets

AlexO9-Jan-03 5:38

9-Jan-03 5:38

MSDN: CHATSRVR Sample: Demonstrates a Windows Sockets Server

smallcoder9-Jan-03 6:41

smallcoder

9-Jan-03 6:41

i did not find the mutliSoc article can you give me the link please

if you think that you can't , that means that you can : if you understand this there youn can

AlexO9-Jan-03 7:12

Problem with the registry

9-Jan-03 7:12

http://download.microsoft.com/download/vc60pro/Sample4/1/WIN98/EN-US/MultiSoc.exe

Jochem9-Jan-03 1:31

Jochem

9-Jan-03 1:31

The problem is that all data that i save in the registry is gone after windows (2000) is restarted. All data appears to be ok after the application closes. But after the restart the key is completely gone.

The code used in the app:

Opening the key:
HKEY hKeyRoot = HKEY_CURRENT_USER;
LPCTSTR pszPath = "Software\\Companyname\\My App Name\\Settings"
HKEY hKey;
DWORD dw;

RegCreateKeyEx(hKeyRoot, pszPath, 0L, NULL, REG_OPTION_VOLATILE, KEY_ALL_ACCESS, NULL, &hKey, &dw);

Writing:

int iValue = 8;
LPCTSTR pszKey = "MyInteger";
hKey as returned by RegCreateKeyEx

RegSetValueEx(hKey, pszKey, 0L, REG_DWORD, (CONST BYTE*)&iValue, sizeof(int));

Does anyone know how to prevent this and why it happens?

Thanks

I'm smart enough to know that i'm stupid and i'm stupid enough to think that i'm smart

Re: Problem with the registry

Joan M9-Jan-03 1:39