Windows Service Simple Sample

Some years ago I was C/C++ developer and I wrote several windows services.
I know that writing of service programs is quite difficult for beginners.

In this post I'm publishing simple working example.
This service only beeps with one second's interval after starts.

service.c

#include <windows.h>

HANDLE  hServerStopEvent = NULL;
VOID ServiceBody();
VOID WINAPI ServiceMain(DWORD dwArgc, LPTSTR *lpszArgv);
VOID WINAPI ServiceControlHandler(DWORD dwCtrlCode);
BOOL ReportStatusToSCMgr(DWORD dwCurrentState, DWORD dwWin32ExitCode, DWORD dwWaitHint);


SERVICE_STATUS          ssStatus;
SERVICE_STATUS_HANDLE   sshStatusHandle;

void _cdecl main(int argc, char **argv)
{
    SERVICE_TABLE_ENTRY dispatchTable[] = 
        {{"", (LPSERVICE_MAIN_FUNCTION)ServiceMain }, { NULL, NULL }};
    StartServiceCtrlDispatcher(dispatchTable);
}

void WINAPI ServiceMain(DWORD dwArgc, LPTSTR *lpszArgv)
{
    sshStatusHandle = RegisterServiceCtrlHandler( "", ServiceControlHandler);

    if (!sshStatusHandle)
        goto cleanup;

    ssStatus.dwServiceType = SERVICE_WIN32_OWN_PROCESS;
    ssStatus.dwServiceSpecificExitCode = 0;

    if (!ReportStatusToSCMgr(SERVICE_START_PENDING, NO_ERROR, 3000))
        goto cleanup;

    ServiceBody();

cleanup:
    if (sshStatusHandle)
        (VOID)ReportStatusToSCMgr(SERVICE_STOPPED, NO_ERROR, 0);
    return;
}

VOID WINAPI ServiceControlHandler(DWORD dwCtrlCode)
{
    if(dwCtrlCode==SERVICE_CONTROL_STOP)
    {
        ReportStatusToSCMgr(SERVICE_STOP_PENDING, NO_ERROR, 0);
        if ( hServerStopEvent )
            SetEvent(hServerStopEvent);
    }
    ReportStatusToSCMgr(ssStatus.dwCurrentState, NO_ERROR, 0);
}

BOOL ReportStatusToSCMgr(DWORD dwCurrentState, DWORD dwWin32ExitCode, DWORD dwWaitHint)
{
    if (dwCurrentState == SERVICE_START_PENDING)
        ssStatus.dwControlsAccepted = 0;
    else
        ssStatus.dwControlsAccepted = SERVICE_ACCEPT_STOP;

    ssStatus.dwCurrentState = dwCurrentState;
    ssStatus.dwWin32ExitCode = dwWin32ExitCode;
    ssStatus.dwWaitHint = dwWaitHint;

    if ( ( dwCurrentState == SERVICE_RUNNING ) 
        || ( dwCurrentState == SERVICE_STOPPED ) )
        ssStatus.dwCheckPoint = 0;
    else
        ssStatus.dwCheckPoint++;

    return SetServiceStatus( sshStatusHandle, &ssStatus);
}


//This sample only beeps.
VOID ServiceBody ()
{   
    hServerStopEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
    if (!hServerStopEvent)
        goto cleanup;

    if (!ReportStatusToSCMgr(SERVICE_RUNNING, NO_ERROR, 0))
        goto cleanup;

    do 
    {
        MessageBeep(-1);
    } while (WaitForSingleObject(hServerStopEvent, 1000 )== WAIT_TIMEOUT);

cleanup:
    if (hServerStopEvent)
        CloseHandle(hServerStopEvent);
}

Script for compiling with Visual C++ 6.0:

make_vc6.bat
@call "D:\Program Files\Microsoft Visual Studio\VC98\Bin\vcvars32.bat"
@cl /nologo service.c user32.lib advapi32.lib
@del service.obj

If you use Visual C++ Express, you need additional Platform SDK from Microsoft.

Install (register) service via command:

service_create.bat
sc create "XQX Service" binPath= %CD%\service.exe

Start service via command:

service_start.bat
net start "XQX Service"

Stop service via command:

service_stop.bat
net stop "XQX Service"

Uninstall (remove) service via command:

service_delete.bat
sc delete "XQX Service"

Blog locking

Last week my blog was locked by Blogger's spam-prevention robots...
It say:
Blogger's spam-prevention robots have detected that your blog has characteristics of a spam blog.

But today Blogger's operators have appologized:
Your blog has been reviewed, verified, and cleared for regular use so that
it will no longer appear as potential spam. If you sign out of Blogger and
sign back in again, you should be able to post as normal. Thanks for your
patience, and we apologize for any inconvenience this has caused.

And now I'm available again :-)

Matrox Mystique Rainbow Runner

The best item in my collection of computer hardware is video card "Matrox Mystique Rainbow Runner".

This card looks like a sandwich.

It comprises two pieces: main and child.

And also has a set of cables and CDs.


But it works only in Win3.1-Win95, because this card has been released in past century.

HowTo disable speaker in the Linux terminal

Speaker in the linux console is very tiresome.
I know way how to disable system speaker.

1. Insert line:
   
set bell-style none

   to the file .input.rc
   


2. Execute command:
   
setterm -blength 0
or
setterm -bfreq 0
or
echo -ne '\033[11;0]'

   

Enjoy :-).

HowTo root login without password

Only add kernel parameter init=/bin/bash at boot time.

• If the boot loader is GRUB, change string parameter from:
  kernel /boot/vmlinuz-2.6.15-26-386 ...
  to:
  kernel /boot/vmlinuz-2.6.15-26-386 ... init=/bin/bash
  


• If the boot loader is LILO, enter:
  boot: linux init=/bin/sh
  

! You should have physical access to the linux server.
!! It works only when boot loader not have an own password.

Then you can do everything with root permissions, for example repair system or restore root password.
If you want to disable readonly mode, type mount -o remount,rw / in the command line.