如何使用 Win32 ThreadPool API?

这个版本(基于这篇文章(工作：

#include <windows.h>
#include <tchar.h>
#include <stdio.h>
VOID
CALLBACK
MyWorkCallback(
PTP_CALLBACK_INSTANCE Instance,
PVOID                 Parameter,
PTP_WORK              Work
)
{
// Instance, Parameter, and Work not used in this example.
UNREFERENCED_PARAMETER(Instance);
UNREFERENCED_PARAMETER(Parameter);
UNREFERENCED_PARAMETER(Work);
DWORD threadId = GetCurrentThreadId();
BOOL bRet = FALSE;
//
// Do something when the work callback is invoked.
//
{
_tprintf(_T("MyWorkCallback: ThreadId = %d Task performed.n"), threadId);
}
return;
}
int main()
{
TP_CALLBACK_ENVIRON CallBackEnviron;
PTP_POOL pool = NULL;
PTP_CLEANUP_GROUP cleanupgroup = NULL;
PTP_WORK_CALLBACK workcallback = MyWorkCallback;
PTP_TIMER timer = NULL;
PTP_WORK work = NULL;

InitializeThreadpoolEnvironment(&CallBackEnviron);
pool = CreateThreadpool(NULL);
SetThreadpoolThreadMaximum(pool, 1);
SetThreadpoolThreadMinimum(pool, 3);
cleanupgroup = CreateThreadpoolCleanupGroup();
SetThreadpoolCallbackPool(&CallBackEnviron, pool);
SetThreadpoolCallbackCleanupGroup(&CallBackEnviron, cleanupgroup, NULL);
work = CreateThreadpoolWork(workcallback, NULL, &CallBackEnviron);
for (int i = 0; i < 10; ++i)
{
SubmitThreadpoolWork(work);
}
}

但是，此版本也可以工作(具有与上面的相同工作功能(：

int main()
{
PTP_WORK = CreateThreadpoolWork(workcallback, NULLPTR, NULLPTR);
for (int i = 0; i < 10; ++i)
{ 
SubmitThreadpoolWork(work);
}
}

两个版本之间有什么区别(最小和最大线程数除外(？
为什么我会使用一个版本而不是另一个版本？