Logon Trigger Example (C++)

This C++ example shows how to create a task that is scheduled to execute Notepad when a user logs on. The task contains a logon trigger that specifies a start boundary for the task to start and a user identifier that specifies the user. The task is registered using the Administrators group as a security context to run the task.

The following procedure describes how to schedule a task to start an executable when a user logs on.

Aa381911.wedge(en-us,VS.85).gifTo schedule Notepad to start when a user logs on

  1. Initialize COM and set general COM security.
  2. Create the ITaskService object.

    This object allows you to create tasks in a specified folder.

  3. Get a task folder to create a task in.

    Use the ITaskService::GetFolder method to get the folder, and the ITaskService::NewTask method to create the ITaskDefinition object.

  4. Define information about the task using the ITaskDefinition object, such as the registration information for the task.

    Use the RegistrationInfo property of ITaskDefinition and other properties of the ITaskDefinition interface to define the task information.

  5. Create a logon trigger using the Triggers property of ITaskDefinition to access the ITriggerCollection interface for the task.

    Use the ITriggerCollection::Create method to specify that you want to create a logon trigger. You can set the start boundary and the UserId property for the trigger so that the task's actions will be scheduled to execute when the user logs on after the start boundary.

  6. Create an action for the task to execute by using the Actions property of ITaskDefinition to access the IActionCollection interface for the task. Use the IActionCollection::Create method to specify the type of action that you want to create. This example uses an IExecAction object, which represents an action that executes a command-line operation.
  7. Register the task using the ITaskFolder::RegisterTaskDefinition method.

The following C++ example shows how to schedule a task to execute Notepad when a user logs on.


/**********************************************************************
 This sample schedules a task to start notepad.exe when a user logs on. 
**********************************************************************/

#define _WIN32_DCOM

#include <windows.h>
#include <iostream>
#include <stdio.h>
#include <comdef.h>
//  Include the task header file.
#include <taskschd.h>
#pragma comment(lib, "taskschd.lib")
#pragma comment(lib, "comsupp.lib")

using namespace std;


int __cdecl wmain()
{
    //  ------------------------------------------------------
    //  Initialize COM.
    HRESULT hr = CoInitializeEx(NULL, COINIT_MULTITHREADED);
    if( FAILED(hr) )
    {
        printf("\nCoInitializeEx failed: %x", hr );
        return 1;
    }

    //  Set general COM security levels.
    hr = CoInitializeSecurity(
        NULL,
        -1,
        NULL,
        NULL,
        RPC_C_AUTHN_LEVEL_PKT_PRIVACY,
        RPC_C_IMP_LEVEL_IMPERSONATE,
        NULL,
        0,
        NULL);

    if( FAILED(hr) )
    {
        printf("\nCoInitializeSecurity failed: %x", hr );
        CoUninitialize();
        return 1;
    }

    //  ------------------------------------------------------
    //  Create a name for the task.
    LPCWSTR wszTaskName = L"Logon Trigger Test Task";

    //  Get the windows directory and set the path to notepad.exe.
    wstring wstrExecutablePath = _wgetenv( L"WINDIR");
    wstrExecutablePath += L"\\SYSTEM32\\NOTEPAD.EXE";


    //  ------------------------------------------------------
    //  Create an instance of the Task Service. 
    ITaskService *pService = NULL;
    hr = CoCreateInstance( CLSID_TaskScheduler,
                           NULL,
                           CLSCTX_INPROC_SERVER,
                           IID_ITaskService,
                           (void**)&pService );  
    if (FAILED(hr))
    {
          printf("Failed to create an instance of ITaskService: %x", hr);
          CoUninitialize();
          return 1;
    }
        
    //  Connect to the task service.
    hr = pService->Connect(_variant_t(), _variant_t(),
        _variant_t(), _variant_t());
    if( FAILED(hr) )
    {
        printf("ITaskService::Connect failed: %x", hr );
        pService->Release();
        CoUninitialize();
        return 1;
    }

    //  ------------------------------------------------------
    //  Get the pointer to the root task folder.  This folder will hold the
    //  new task that is registered.
    ITaskFolder *pRootFolder = NULL;
    hr = pService->GetFolder( _bstr_t( L"\\") , &pRootFolder );
    if( FAILED(hr) )
    {
        printf("Cannot get Root Folder pointer: %x", hr );
        pService->Release();
        CoUninitialize();
        return 1;
    }
    
    //  If the same task exists, remove it.
    pRootFolder->DeleteTask( _bstr_t( wszTaskName), 0  );
    
    //  Create the task builder object to create the task.
    ITaskDefinition *pTask = NULL;
    hr = pService->NewTask( 0, &pTask );

    pService->Release();  // COM clean up.  Pointer is no longer used.
    if (FAILED(hr))
    {
        printf("Failed to create a task definition: %x", hr);
        pRootFolder->Release();
        CoUninitialize();
        return 1;
    }
        
    //  ------------------------------------------------------
    //  Get the registration info for setting the identification.
    IRegistrationInfo *pRegInfo= NULL;
    hr = pTask->get_RegistrationInfo( &pRegInfo );
    if( FAILED(hr) )
    {
        printf("\nCannot get identification pointer: %x", hr );
        pRootFolder->Release();
        pTask->Release();
        CoUninitialize();
        return 1;
    }
    
    hr = pRegInfo->put_Author(L"Author Name");
    pRegInfo->Release();  
    if( FAILED(hr) )
    {
        printf("\nCannot put identification info: %x", hr );
        pRootFolder->Release();
        pTask->Release();
        CoUninitialize();
        return 1;
    }

    //  ------------------------------------------------------
    //  Create the settings for the task
    ITaskSettings *pSettings = NULL;
    hr = pTask->get_Settings( &pSettings );
    if( FAILED(hr) )
    {
        printf("\nCannot get settings pointer: %x", hr );
        pRootFolder->Release();
        pTask->Release();
        CoUninitialize();
        return 1;
    }
    
    //  Set setting values for the task. 
    hr = pSettings->put_StartWhenAvailable(VARIANT_TRUE);
    pSettings->Release();  
    if( FAILED(hr) )
    {
        printf("\nCannot put setting info: %x", hr );
        pRootFolder->Release();
        pTask->Release();
        CoUninitialize();
        return 1;
    }

    //  ------------------------------------------------------
    //  Get the trigger collection to insert the logon trigger.
    ITriggerCollection *pTriggerCollection = NULL;
    hr = pTask->get_Triggers( &pTriggerCollection );
    if( FAILED(hr) )
    {
        printf("\nCannot get trigger collection: %x", hr );
        pRootFolder->Release();
        pTask->Release();
        CoUninitialize();
        return 1;
    }

    //  Add the logon trigger to the task.
    ITrigger *pTrigger = NULL;
    hr = pTriggerCollection->Create( TASK_TRIGGER_LOGON, &pTrigger );
    pTriggerCollection->Release();
    if( FAILED(hr) )
    {
        printf("\nCannot create the trigger: %x", hr );
        pRootFolder->Release();
        pTask->Release();
        CoUninitialize();
        return 1;
    }

    ILogonTrigger *pLogonTrigger = NULL;       
    hr = pTrigger->QueryInterface( 
            IID_ILogonTrigger, (void**) &pLogonTrigger );
    pTrigger->Release();
    if( FAILED(hr) )
    {
        printf("\nQueryInterface call failed for ILogonTrigger: %x", hr );
        pRootFolder->Release();
        pTask->Release();
        CoUninitialize();
        return 1;
    }
    
    hr = pLogonTrigger->put_Id( _bstr_t( L"Trigger1" ) );
    if( FAILED(hr) )
       printf("\nCannot put the trigger ID: %x", hr);
    
    //  Set the task to start at a certain time. The time 
    //  format should be YYYY-MM-DDTHH:MM:SS(+-)(timezone).
    //  For example, the start boundary below
    //  is January 1st 2005 at 12:05
    hr = pLogonTrigger->put_StartBoundary( _bstr_t(L"2005-01-01T12:05:00") );
    if( FAILED(hr) )
       printf("\nCannot put the start boundary: %x", hr);
    
    hr = pLogonTrigger->put_EndBoundary( _bstr_t(L"2015-05-02T08:00:00") );
    if( FAILED(hr) )
       printf("\nCannot put the end boundary: %x", hr);    
    
    //  Define the user.  The task will execute when the user logs on.
    //  The specified user must be a user on this computer.  
    hr = pLogonTrigger->put_UserId( _bstr_t( L"DOMAIN\\UserName" ) );  
    pLogonTrigger->Release();
    if( FAILED(hr) )
    {
        printf("\nCannot add user ID to logon trigger: %x", hr );
        pRootFolder->Release();
        pTask->Release();
        CoUninitialize();
        return 1;
    }

    //  ------------------------------------------------------
    //  Add an Action to the task. This task will execute notepad.exe.     
    IActionCollection *pActionCollection = NULL;

    //  Get the task action collection pointer.
    hr = pTask->get_Actions( &pActionCollection );
    if( FAILED(hr) )
    {
        printf("\nCannot get Task collection pointer: %x", hr );
        pRootFolder->Release();
        pTask->Release();
        CoUninitialize();
        return 1;
    }
        
    //  Create the action, specifying that it is an executable action.
    IAction *pAction = NULL;
    hr = pActionCollection->Create( TASK_ACTION_EXEC, &pAction );
    pActionCollection->Release();
    if( FAILED(hr) )
    {
        printf("\nCannot create the action: %x", hr );
        pRootFolder->Release();
        pTask->Release();
        CoUninitialize();
        return 1;
    }

    IExecAction *pExecAction = NULL;
    //  QI for the executable task pointer.
    hr = pAction->QueryInterface( 
        IID_IExecAction, (void**) &pExecAction );
    pAction->Release();
    if( FAILED(hr) )
    {
        printf("\nQueryInterface call failed for IExecAction: %x", hr );
        pRootFolder->Release();
        pTask->Release();
        CoUninitialize();
        return 1;
    }

    //  Set the path of the executable to notepad.exe.
    hr = pExecAction->put_Path( _bstr_t( wstrExecutablePath.c_str() ) );
    pExecAction->Release();
    if( FAILED(hr) )
    {
        printf("\nCannot set path of executable: %x", hr );
        pRootFolder->Release();
        pTask->Release();
        CoUninitialize();
        return 1;
    }
    
    //  ------------------------------------------------------
    //  Save the task in the root folder.
    IRegisteredTask *pRegisteredTask = NULL;
    
    hr = pRootFolder->RegisterTaskDefinition(
            _bstr_t( wszTaskName ),
            pTask,
            TASK_CREATE_OR_UPDATE, 
            _variant_t(L"Builtin\\Administrators"), 
            _variant_t(), 
            TASK_LOGON_GROUP,
            _variant_t(L""),
            &pRegisteredTask);
    if( FAILED(hr) )
    {
        printf("\nError saving the Task : %x", hr );
        pRootFolder->Release();
        pTask->Release();
        CoUninitialize();
        return 1;
    }
    
    printf("\n Success! Task successfully registered. " );

    // Clean up
    pRootFolder->Release();
    pTask->Release();
    pRegisteredTask->Release();
    CoUninitialize();
    return 0;
}


Related topics

Using the Task Scheduler

 

 

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