註冊觸發程式範例 (C++)

發行項
06/13/2023

這個 C++ 範例示範如何建立排程在註冊工作時執行記事本的工作。工作包含註冊觸發程式，指定工作的開始界限和結束界限，以及工作的延遲。開始界限會指定何時啟動觸發程式，而延遲會設定註冊工作與啟動工作之間的時間量。此工作也包含動作，指定要執行記事本的工作。

注意

更新具有註冊觸發程式的工作時，工作會在更新發生之後執行。

下列程式描述如何排程工作，以在註冊工作時啟動可執行檔。

若要排程記事本在註冊工作時啟動

初始化 COM 並設定一般 COM 安全性。
建立 ITaskService 物件。這個物件可讓您在指定的資料夾中建立工作。
取得工作資料夾以在中建立工作。使用 ITaskService：：GetFolder 方法可取得資料夾，以及 ITaskService：：NewTask 方法可建立 ITaskDefinition 物件。
使用 ITaskDefinition 物件定義工作的相關資訊，例如工作的註冊資訊。使用 ITaskDefinition 的 RegistrationInfo 屬性 ，以及 ITaskDefinition 介面的其他屬性來定義工作資訊。
使用 ITaskDefinition 的 Triggers 屬性 建立註冊觸發程式，以存取工作的 ITriggerCollection 。使用 ITriggerCollection：：Create 方法 (指定您要建立) 建立註冊觸發程式的觸發程式類型。
使用 ITaskDefinition 的 Actions 屬性 來存取工作的 IActionCollection 介面，建立要執行的動作。使用 IActionCollection：：Create 方法來指定您想要建立的動作類型。這個範例使用 IExecAction 物件，代表執行命令列作業的動作。
使用 ITaskFolder：：RegisterTaskDefinition 方法註冊 工作。

下列 C++ 範例示範如何排程工作，以在註冊工作之後 30 秒執行記事本。

/********************************************************************
 This sample schedules a task to start notepad.exe 30 seconds after
 the task is registered. 
********************************************************************/

#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"Registration 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.
    hr = 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 principal for the task
    IPrincipal *pPrincipal = NULL;
    hr = pTask->get_Principal( &pPrincipal );
    if( FAILED(hr) )
    {
        printf("\nCannot get principal pointer: %x", hr );
        pRootFolder->Release();
        pTask->Release();
        CoUninitialize();
        return 1;
    }
    
    //  Set up principal information: 
    hr = pPrincipal->put_Id( _bstr_t(L"Principal1") ); 
    if( FAILED(hr) )
        printf("\nCannot put the principal ID: %x", hr);

    hr = pPrincipal->put_LogonType( TASK_LOGON_INTERACTIVE_TOKEN );
    if( FAILED(hr) )
        printf("\nCannot put principal logon type: %x", hr);

    //  Run the task with the least privileges (LUA) 
    hr = pPrincipal->put_RunLevel( TASK_RUNLEVEL_LUA ); 
    pPrincipal->Release();  
    if( FAILED(hr) )
    {
        printf("\nCannot put principal run level: %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 registration 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 registration trigger to the task.
    ITrigger *pTrigger = NULL;    
    hr = pTriggerCollection->Create( TASK_TRIGGER_REGISTRATION, &pTrigger );
    pTriggerCollection->Release();
    if( FAILED(hr) )
    {
        printf("\nCannot create a registration trigger: %x", hr );
        pRootFolder->Release();
        pTask->Release();
        CoUninitialize();
        return 1;
    }     
    
    IRegistrationTrigger *pRegistrationTrigger = NULL;
    hr = pTrigger->QueryInterface( 
        IID_IRegistrationTrigger, (void**) &pRegistrationTrigger );
    pTrigger->Release();
    if( FAILED(hr) )
    {
        printf("\nQueryInterface call failed on IRegistrationTrigger: %x", hr );
        pRootFolder->Release();
        pTask->Release();
        CoUninitialize();
        return 1;
    }
    
    hr = pRegistrationTrigger->put_Id( _bstr_t( L"Trigger1" ) );
    if( FAILED(hr) )
        printf("\nCannot put trigger ID: %x", hr);
    
    //  Define the delay for the registration trigger.
    hr = pRegistrationTrigger->put_Delay( L"PT30S" );
    pRegistrationTrigger->Release();
    if( FAILED(hr) )
    {
        printf("\nCannot put registration trigger delay: %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;

    //  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 put the action executable path: %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(), 
            _variant_t(), 
            TASK_LOGON_INTERACTIVE_TOKEN,
            _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;
}

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註冊觸發程式範例 (C++)

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