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Příklad denního triggeru (C++)

Tento příklad jazyka C++ ukazuje, jak vytvořit úlohu naplánovanou pro každodenní spuštění Poznámkového bloku. Úkol obsahuje denní aktivační událost, která určuje hranici zahájení a denní interval zahájení úkolu. Příklad také ukazuje, jak nastavit vzorec opakování pro trigger, který má úlohu opakovat. Úkol obsahuje také akci, která určuje úkol ke spuštění Poznámkového bloku.

Následující postup popisuje, jak naplánovat úlohu tak, aby se spustitelný soubor spustil každý den.

Naplánování každodenního spuštění Poznámkového bloku

  1. Inicializace modelu COM a nastavení obecného zabezpečení modelu COM

  2. Vytvořte objekt ITaskService.

    Tento objekt umožňuje vytvářet úkoly v zadané složce.

  3. Získejte složku úkolů, ve které chcete vytvořit úkol.

    Pomocí metody ITaskService::GetFolder získejte složku a metodu ITaskService::NewTask k vytvoření objektu ITaskDefinition.

  4. Definujte informace o úkolu pomocí objektu ITaskDefinition, například informace o registraci úlohy.

    K definování informací o úkolu použijte vlastnost RegistrationInfo ITaskDefinition a další vlastnosti rozhraní ITaskDefinition.

  5. Vytvořte denní trigger pomocí Triggers vlastnost ITaskDefinition pro přístup k rozhraní ITriggerCollection pro úlohu.

    Pomocí metody ITriggerCollection::Create určete, že chcete vytvořit denní aktivační událost. Můžete nastavit hranice spuštění a interval dnů pro trigger, aby akce úkolu byly naplánovány na zadaný čas v určitých dnech. Příklad také ukazuje, jak nastavit vzorec opakování pro trigger, který má úlohu opakovat.

  6. Vytvořte akci pro úlohu, která se má provést, pomocí Actions vlastnost ITaskDefinition pro přístup k rozhraní IActionCollection pro úlohu.

    Pomocí metody IActionCollection::Create zadejte typ akce, kterou chcete vytvořit. Tento příklad používá objekt IExecAction, který představuje akci, která provádí operaci příkazového řádku.

  7. Zaregistrujte úlohu pomocí metody ITaskFolder::RegisterTaskDefinition.

Následující příklad jazyka C++ ukazuje, jak naplánovat úlohu, která má provádět Poznámkový blok každý den.

/********************************************************************
 This sample schedules a task to start on a daily basis. 
********************************************************************/

#define _WIN32_DCOM

#include <windows.h>
#include <iostream>
#include <stdio.h>
#include <comdef.h>
#include <wincred.h>
//  Include the task header file.
#include <taskschd.h>
#pragma comment(lib, "taskschd.lib")
#pragma comment(lib, "comsupp.lib")
#pragma comment(lib, "credui.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"Daily 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 CoCreate an instance of the TaskService class: %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( _bstr_t(L"Author Name") );
    pRegInfo->Release();  // COM clean up.  Pointer is no longer used.
    if( FAILED(hr) )
    {
        printf("\nCannot put identification info: %x", hr );
        pRootFolder->Release();
        pTask->Release();
        CoUninitialize();
        return 1;
    }
    
    //  ------------------------------------------------------
    //  Get the trigger collection to insert the daily 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 daily trigger to the task.
    ITrigger *pTrigger = NULL;    
    hr = pTriggerCollection->Create( TASK_TRIGGER_DAILY, &pTrigger );
    pTriggerCollection->Release();
    if( FAILED(hr) )
    {
        printf("\nCannot create the trigger: %x", hr );
        pRootFolder->Release();
        pTask->Release();
        CoUninitialize();
        return 1;
    }     
    
    IDailyTrigger *pDailyTrigger = NULL;
    hr = pTrigger->QueryInterface( 
        IID_IDailyTrigger, (void**) &pDailyTrigger );
    pTrigger->Release();
    if( FAILED(hr) )
    {
        printf("\nQueryInterface call on IDailyTrigger failed: %x", hr );
        pRootFolder->Release();
        pTask->Release();
        CoUninitialize();
        return 1;
    }
    
    hr = pDailyTrigger->put_Id( _bstr_t( L"Trigger1" ) );
    if( FAILED(hr) )
        printf("\nCannot put trigger ID: %x", hr);

    //  Set the task to start daily 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 = pDailyTrigger->put_StartBoundary( _bstr_t(L"2005-01-01T12:05:00") );
    if( FAILED(hr) )
        printf("\nCannot put start boundary: %x", hr);
    
    //  Set the time when the trigger is deactivated.
    hr = pDailyTrigger->put_EndBoundary( _bstr_t(L"2007-05-02T12:05:00") );
    if( FAILED(hr) )
        printf("\nCannot put the end boundary: %x", hr);
 
    //  Define the interval for the daily trigger. An interval of 2 produces an
    //  every other day schedule
    hr = pDailyTrigger->put_DaysInterval( (short)2 );
    if( FAILED(hr) )
    {
        printf("\nCannot put days interval: %x", hr );
        pRootFolder->Release();
        pDailyTrigger->Release();
        pTask->Release();
        CoUninitialize();
        return 1;
    }

    // Add a repetition to the trigger so that it repeats
    // five times.
    IRepetitionPattern *pRepetitionPattern = NULL;
    hr = pDailyTrigger->get_Repetition( &pRepetitionPattern );
    pDailyTrigger->Release();
    if( FAILED(hr) )
    {
        printf("\nCannot get repetition pattern: %x", hr );
        pRootFolder->Release();
        pTask->Release();
        CoUninitialize();
        return 1;
    }
    
    hr = pRepetitionPattern->put_Duration( _bstr_t(L"PT4M"));
    if( FAILED(hr) )
    {
        printf("\nCannot put repetition duration: %x", hr );
        pRootFolder->Release();
        pRepetitionPattern->Release();
        pTask->Release();
        CoUninitialize();
        return 1;
    }

    hr = pRepetitionPattern->put_Interval( _bstr_t(L"PT1M"));
    pRepetitionPattern->Release();
    if( FAILED(hr) )
    {
        printf("\nCannot put repetition interval: %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 action: %x", hr );
        pRootFolder->Release();
        pTask->Release();
        CoUninitialize();
        return 1;
    }

    IExecAction *pExecAction = NULL;
    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 put the executable path: %x", hr );
        pRootFolder->Release();
        pTask->Release();
        CoUninitialize();
        return 1;
    }

    //  ------------------------------------------------------
    //  Securely get the user name and password. The task will
    //  be created to run with the credentials from the supplied 
    //  user name and password.
    CREDUI_INFO cui;
    TCHAR pszName[CREDUI_MAX_USERNAME_LENGTH] = TEXT("");
    TCHAR pszPwd[CREDUI_MAX_PASSWORD_LENGTH] = TEXT("");
    BOOL fSave;
    DWORD dwErr;

    cui.cbSize = sizeof(CREDUI_INFO);
    cui.hwndParent = NULL;
    //  Ensure that MessageText and CaptionText identify
    //  what credentials to use and which application requires them.
    cui.pszMessageText = TEXT("Account information for task registration:");
    cui.pszCaptionText = TEXT("Enter Account Information for Task Registration");
    cui.hbmBanner = NULL;
    fSave = FALSE;

    //  Create the UI asking for the credentials.
    dwErr = CredUIPromptForCredentials(
        &cui,                             //  CREDUI_INFO structure
        TEXT(""),                         //  Target for credentials
        NULL,                             //  Reserved
        0,                                //  Reason
        pszName,                          //  User name
        CREDUI_MAX_USERNAME_LENGTH,       //  Max number for user name
        pszPwd,                           //  Password
        CREDUI_MAX_PASSWORD_LENGTH,       //  Max number for password
        &fSave,                           //  State of save check box
        CREDUI_FLAGS_GENERIC_CREDENTIALS |  //  Flags
        CREDUI_FLAGS_ALWAYS_SHOW_UI |
        CREDUI_FLAGS_DO_NOT_PERSIST);  

    if(dwErr)
    {
        cout << "Did not get credentials." << endl;    
        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(_bstr_t(pszName)), 
            _variant_t(_bstr_t(pszPwd)), 
            TASK_LOGON_PASSWORD,
            _variant_t(L""),
            &pRegisteredTask);
    if( FAILED(hr) )
    {
        printf("\nError saving the Task : %x", hr );
        pRootFolder->Release();
        pTask->Release();
        CoUninitialize();
        SecureZeroMemory(pszName, sizeof(pszName));
        SecureZeroMemory(pszPwd, sizeof(pszPwd));
        return 1;
    }

    printf("\n Success! Task successfully registered. " );

    //  Clean up
    pRootFolder->Release();
    pTask->Release();
    pRegisteredTask->Release();
    CoUninitialize();
    SecureZeroMemory(pszName, sizeof(pszName));
    SecureZeroMemory(pszPwd, sizeof(pszPwd));
    return 0;
}

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