How to check trigger of a task in Task scheduler using c++? - c++

Question

I want to check the triggers for the tasks in the Task scheduler using c++.
I want to use the function HRESULT get_Type(TASK_TRIGGER_TYPE2 *pType);
to check whether the task is logon or boot triggered.
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;
TASK_TRIGGER_TYPE2 *pType = NULL;
hr = pRegisteredTask->get_Name(&taskName);
if (SUCCEEDED(hr))
{
printf("\nTask Name: %S", taskName);
SysFreeString(taskName);
hr = pRegisteredTask->get_Type(*pType); //Implemented here
if (SUCCEEDED(hr))
printf("\n%s",&pType);
else
printf("\n\tCannot get the registered task state: %x", hr);
}
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);
}
}
On compilation, it gives me an error saying "IRegisteredTask has no member get_Type()"
Then I altered the code and added
ITrigger *trig = NULL;
trig->get_Type(&pType);
But that doesnt give me any values either

Answer 1

The following is code piece works fore me you can have a try:
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);
}
ITaskDefinition* taskDef = NULL;
hr = pRegisteredTask->get_Definition(&taskDef);
if (SUCCEEDED(hr))
{
ITriggerCollection* triggers = NULL;
taskDef->get_Triggers(&triggers);
LONG trigCnt = 0;
triggers->get_Count(&trigCnt);
for (LONG i = 0; i < trigCnt; i++)
{
ITrigger* trig = NULL;
TASK_TRIGGER_TYPE2 pType = TASK_TRIGGER_EVENT;
triggers->get_Item(_variant_t(i + 1), &trig);
trig->get_Type(&pType);
DWORD errCode = GetLastError();
if(pType != NULL)
printf("\nTrigger Type : %d", pType);
}
}
else
{
printf("\nCannot get the registered task definition: %x", hr);
}
pRegisteredTask->Release();
}
else
{
printf("\nCannot get the registered task item at index=%d: %x", i + 1, hr);
}
}
Refer to "Displaying Task Names and States (C++)"

Answer 2

Looking at the documentation, it looks like after you have a IRegisteredTask you need to call get_Definition() to get its ITaskDefinition.
Using the ITaskDefinition, you can get the a ITriggerCollection via get_Triggers()
Then, enumerating over the ITriggerCollection, you can QueryInterface() each ITrigger to see if it supports the ILogonTrigger or IBootTrigger interfaces.