C ++ to determine whether there is a process id

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//判断进程id是否存在
//@param:process_id:需要传入的进程id值
//return:True:存在，False:不存在
BOOL isExistProcess(DWORD process_id)
{
	HANDLE hSnapshot = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
	if (INVALID_HANDLE_VALUE == hSnapshot) {
		return NULL;
	}
	PROCESSENTRY32 pe = { sizeof(pe) };
	for (BOOL ret = Process32First(hSnapshot, &pe); ret; ret = Process32Next(hSnapshot, &pe)) {

		if (pe.th32ProcessID == process_id)
		{
			return TRUE;
		}
	}
	CloseHandle(hSnapshot);
	return FALSE;
}