显示 C++ (的任务名称和状态)

这两个 C++ 示例演示如何枚举任务。 一个示例演示如何在任务文件夹中显示任务的信息,另一个示例演示如何显示所有正在运行的任务的信息。

以下过程介绍如何显示任务文件夹中所有任务的任务名称和状态。

显示任务文件夹中所有任务的任务名称和状态

  1. 初始化 COM 并设置常规 COM 安全性。

  2. 创建 ITaskService 对象。

    此对象允许连接到任务计划程序服务并访问特定的任务文件夹。

  3. 获取保存所需任务的任务文件夹。

    使用 ITaskService::GetFolder 方法获取文件夹。

  4. 从文件夹中获取任务的集合。

    使用 ITaskFolder::GetTasks 方法获取 (IRegisteredTaskCollection) 的任务集合。

  5. 获取集合中的任务数,并枚举集合中的每个任务。

    使用 IRegisteredTaskCollection 的 Item 属性 获取 IRegisteredTask 实例。 每个实例将包含集合中的任务。 然后,可以从每个已注册的任务) 显示 (属性值的信息。

以下 C++ 示例演示如何显示根任务文件夹中所有任务的名称和状态。

/********************************************************************
 This sample enumerates through the tasks on the local computer and 
 displays their name and state. 
********************************************************************/

#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 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 CoCreate an instance of the TaskService class: %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.
    ITaskFolder *pRootFolder = NULL;
    hr = pService->GetFolder( _bstr_t( L"\\") , &pRootFolder );
    
    pService->Release();
    if( FAILED(hr) )
    {
        printf("Cannot get Root Folder pointer: %x", hr );
        CoUninitialize();
        return 1;
    }
    
    //  -------------------------------------------------------
    //  Get the registered tasks in the folder.
    IRegisteredTaskCollection* pTaskCollection = NULL;
    hr = pRootFolder->GetTasks( NULL, &pTaskCollection );

    pRootFolder->Release();
    if( FAILED(hr) )
    {
        printf("Cannot get the registered tasks.: %x", hr);
        CoUninitialize();
        return 1;
    }

    LONG numTasks = 0;
    hr = pTaskCollection->get_Count(&numTasks);

    if( numTasks == 0 )
     {
        printf("\nNo Tasks are currently running" );
        pTaskCollection->Release();
        CoUninitialize();
        return 1;
     }

    printf("\nNumber of Tasks : %d", numTasks );

    TASK_STATE taskState;
    
    for(LONG i=0; i < numTasks; i++)
    {
        IRegisteredTask* pRegisteredTask = NULL;
        hr = pTaskCollection->get_Item( _variant_t(i+1), &pRegisteredTask );
        
        if( SUCCEEDED(hr) )
        {
            BSTR taskName = NULL;
            hr = pRegisteredTask->get_Name(&taskName);
            if( SUCCEEDED(hr) )
            {
                printf("\nTask Name: %S", taskName);
                SysFreeString(taskName);

                hr = pRegisteredTask->get_State(&taskState);
                if (SUCCEEDED (hr) )
                    printf("\n\tState: %d", taskState);
                else 
                    printf("\n\tCannot get the registered task state: %x", hr);
            }
            else
            {
                printf("\nCannot get the registered task name: %x", hr);
            }
            pRegisteredTask->Release();
        }
        else
        {
            printf("\nCannot get the registered task item at index=%d: %x", i+1, hr);
        }
    }

    pTaskCollection->Release();
    CoUninitialize();
    return 0;
}

以下过程介绍如何显示所有正在运行的任务的任务名称和状态。

显示所有正在运行的任务的任务名称和状态

  1. 初始化 COM 并设置常规 COM 安全性。

  2. 创建 ITaskService 对象。

    此对象允许连接到任务计划程序服务并访问特定的任务文件夹。

  3. 使用 ITaskService::GetRunningTasks 方法可获取 IRunningTaskCollection) (所有正在运行的任务的集合。 可以指定获取正在运行的任务实例,包括或排除隐藏的任务。

  4. 获取集合中的任务数,并枚举集合中的每个任务。

    使用 IRunningTaskCollection 的 Item 属性 获取 IRunningTask 实例。 每个实例将包含集合中的任务。 然后,可以从每个已注册的任务) 显示 (属性值的信息。

以下 C++ 示例演示如何显示所有正在运行的任务的名称和状态,包括隐藏任务。

/********************************************************************
 This sample enumerates through all running tasks on the local computer and 
 displays their name and state. 
********************************************************************/

#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 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 CoCreate an instance of the TaskService class: %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 running tasks.
       IRunningTaskCollection* pRunningTasks = NULL;
       hr = pService->GetRunningTasks(TASK_ENUM_HIDDEN, &pRunningTasks);

    pService->Release();
    if( FAILED(hr) )
    {
        printf("Cannot get Root Folder pointer: %x", hr );
        CoUninitialize();
        return 1;
    }
        
    LONG numTasks = 0;
    hr = pRunningTasks->get_Count(&numTasks);

    if( numTasks == 0 )
     {
        printf("\nNo Tasks are currently running" );
        pRunningTasks->Release();
        CoUninitialize();
        return 1;
     }

    printf("\nNumber of running tasks : %d", numTasks );

    TASK_STATE taskState;
    
    for(LONG i=0; i < numTasks; i++)
    {
        IRunningTask* pRunningTask = NULL;
        hr = pRunningTasks->get_Item( _variant_t(i+1), &pRunningTask );
        
        if( SUCCEEDED(hr) )
        {
            BSTR taskName = NULL;
            hr = pRunningTask->get_Name(&taskName);
            if( SUCCEEDED(hr) )
            {
                printf("\nTask Name: %S", taskName);
                SysFreeString(taskName);

                hr = pRunningTask->get_State(&taskState);
                if (SUCCEEDED (hr) )
                    printf("\n\tState: %d", taskState);
                else 
                    printf("\n\tCannot get the registered task state: %x", hr);
            }
            else
            {
                printf("\nCannot get the registered task name: %x", hr);
            }
            pRunningTask->Release();
        }
        else
        {
            printf("\nCannot get the registered task item at index=%d: %x", i+1, hr);
        }
    }

    pRunningTasks->Release();
    CoUninitialize();
    return 0;
}

使用任务计划程序