Exemplo de gatilho de registro (C++)
Este exemplo do C++ mostra como criar uma tarefa agendada para executar o Bloco de Notas quando uma tarefa é registrada. A tarefa contém um gatilho de registro que especifica um limite inicial e um limite final para a tarefa e também um atraso para a tarefa. O limite inicial especifica quando o gatilho é ativado e o atraso define a quantidade de tempo entre quando a tarefa é registrada e quando a tarefa é iniciada. A tarefa também contém uma ação que especifica a tarefa para executar o Bloco de Notas.
Observação
Quando uma tarefa com um gatilho de registro for atualizada, a tarefa será executada após a atualização ocorrer.
O procedimento a seguir descreve como agendar uma tarefa para iniciar um executável quando a tarefa é registrada.
Para agendar o Bloco de Notas para iniciar quando uma tarefa é registrada
- Inicialize COM e defina a segurança COM geral.
- Crie o objeto ITaskService . Esse objeto permite que você crie tarefas em uma pasta especificada.
- Obtenha uma pasta de tarefa na qual criar uma tarefa. Use o método ITaskService::GetFolder para obter a pasta e o método ITaskService::NewTask para criar o objeto ITaskDefinition .
- Defina informações sobre a tarefa usando o objeto ITaskDefinition , como as informações de registro da tarefa. Use a propriedade RegistrationInfo de ITaskDefinition e outras propriedades da interface ITaskDefinition para definir as informações da tarefa.
- Crie um gatilho de registro usando a propriedade Triggers de ITaskDefinition para acessar o ITriggerCollection para a tarefa. Use o método ITriggerCollection::Create (especificando o tipo de gatilho que você deseja criar) para criar um gatilho de registro.
- Crie uma ação para a tarefa a ser executada usando a propriedade Actions de ITaskDefinition para acessar a interface IActionCollection para a tarefa. Use o método IActionCollection::Create para especificar o tipo de ação que você deseja criar. Este exemplo usa um objeto IExecAction , que representa uma ação que executa uma operação de linha de comando.
- Registre a tarefa usando o método ITaskFolder::RegisterTaskDefinition .
O exemplo C++ a seguir mostra como agendar uma tarefa para executar o Bloco de Notas 30 segundos após o registro da tarefa.
/********************************************************************
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;
}
Tópicos relacionados