windows OpenThread() 返回 NULL Win32
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OpenThread() Returns NULL Win32
提问by RCC
I feel like there is an obvious answer to this, but it's been eluding me. I've got some legacy code in C++ here that breaks when it tries to call OpenThread(). I'm running it in Visual C++ 2008 Express Edition. The program first gets the ThreadID of the calling thread, and attempts to open it, like so:
我觉得对此有一个明显的答案，但它一直在躲避我。我在 C++ 中有一些遗留代码，当它尝试调用 OpenThread() 时会中断。我在 Visual C++ 2008 Express Edition 中运行它。程序首先获取调用线程的 ThreadID，并尝试打开它，如下所示：
ThreadId threadId = IsThreaded() ? thread_id : ::GetCurrentThreadId();
ThreadId threadId = IsThreaded() ? thread_id : ::GetCurrentThreadId();
HANDLE threadHandle = OpenThread(THREAD_ALL_ACCESS, FALSE, threadId);
HANDLE threadHandle = OpenThread(THREAD_ALL_ACCESS, FALSE, threadId);
Now here's what I don't understand: if the thread ID is the current thread's ID, isn't it already open? Could that be why it's returning NULL?
现在我不明白的是：如果线程 ID 是当前线程的 ID，它不是已经打开了吗？这可能是它返回NULL的原因吗？
Any feedback would be appreciated.
对于任何反馈，我们都表示感谢。
回答by Michael Burr
Maybe you're asking for too much access (THREAD_ALL_ACCESS), though I'd think that you'd have pretty much all permissions to your own thread. Try reducing the access to what you really need.
也许您要求太多的访问权限 ( THREAD_ALL_ACCESS)，但我认为您对自己的线程几乎拥有所有权限。尝试减少对您真正需要的东西的访问。
What does GetLastError()return?
什么GetLastError()回报？
Update:
更新：
Take a look at this comment from MSDN:
看看来自 MSDN 的评论：
Windows Server 2003 and Windows XP/2000: The size of the
THREAD_ALL_ACCESSflag increased on Windows Server 2008 and Windows Vista. If an application compiled for Windows Server 2008 and Windows Vista is run on Windows Server 2003 or Windows XP/2000, theTHREAD_ALL_ACCESSflag is too large and the function specifying this flag fails withERROR_ACCESS_DENIED. To avoid this problem, specify the minimum set of access rights required for the operation. IfTHREAD_ALL_ACCESSmust be used, set_WIN32_WINNTto the minimum operating system targeted by your application (for example,#define _WIN32_WINNT _WIN32_WINNT_WINXP). For more information, see Using the Windows Headers
Windows Server 2003 和 Windows XP/2000：
THREAD_ALL_ACCESS标志的大小 在 Windows Server 2008 和 Windows Vista 上有所增加。如果为 Windows Server 2008 和 Windows Vista 编译的应用程序在 Windows Server 2003 或 Windows XP/2000 上运行，则THREAD_ALL_ACCESS标志太大并且指定此标志的函数失败并显示ERROR_ACCESS_DENIED. 为避免此问题，请指定操作所需的最小访问权限集。如果THREAD_ALL_ACCESS必须使用，请设置_WIN32_WINNT为您的应用程序所针对的最低操作系统（例如，#define _WIN32_WINNT _WIN32_WINNT_WINXP）。有关详细信息，请参阅使用 Windows 标头
回答by Viraj
Try using _beginthreadex instead of OpenThread. Example:
尝试使用 _beginthreadex 而不是 OpenThread。例子：
HANDLE hThread;
UINT uiThreadId = 0;
hThread = (HANDLE)_beginthreadex(NULL, // Security attributes
0, // stack
&this->ThreadProc, // Thread proc
this, // Thread param
CREATE_SUSPENDED, // creation mode
&uiThreadId); // Thread ID
if (hThread != NULL){
//SetThreadPriority(hThread, THREAD_PRIORITY_HIGHEST);
ResumeThread(hThread);
m_hThread = hThread;
}
else{
eRetVal = err_ThreadStartErr;
}
