重叠 IO 和 ERROR_IO_INCOMPLETE

发布于 2024-10-04 11:47:37 字数 441 浏览 2 评论 0原文

我已经重叠 IO 工作了两年了，但我将它与一个新应用程序一起使用，并且它向我抛出了这个错误（当我隐藏主窗体时）。

我已经用谷歌搜索过，但我无法理解该错误的含义以及我应该如何处理它？

有什么想法吗？

我在 NamedPipes 上使用它，并且在调用 GetOverlappedResult 后发生错误

DWORD dwWait = WaitForMultipleObjects(getNumEvents(), m_hEventsArr, FALSE, 500);

//check result. Get correct data

BOOL fSuccess = GetOverlappedResult(data->hPipe, &data->oOverlap, &cbRet, FALSE);

// error happens here

原文

I have had overlapped IO working for 2 years now but ive used it with a new application and its chucking this error at me (when i hide the main form).

I have googled but i fail to understand what the error means and how i should handle it?

Any ideas?

Im using this over NamedPipes and the error happens after calling GetOverlappedResult

DWORD dwWait = WaitForMultipleObjects(getNumEvents(), m_hEventsArr, FALSE, 500);

//check result. Get correct data

BOOL fSuccess = GetOverlappedResult(data->hPipe, &data->oOverlap, &cbRet, FALSE);

// error happens here

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雨夜星沙 2024-10-11 11:47:37

ERROR_IO_INCOMPLETE 是一个错误代码，表示 Overlapped 操作仍在进行中； GetOverlappedResult 返回 false，因为操作尚未成功。

您有两种选择 - 阻塞和非阻塞：

阻塞直到操作完成：将 GetOverlappedResult 调用更改为：

BOOL fSuccess = GetOverlappedResult(data->hPipe, &data->oOverlap, &cbRet, TRUE);

这可确保 Overlapped 操作已完成（即成功或失败） ) 在返回结果之前。

轮询完成：如果操作仍在进行中，您可以从函数返回，并在等待结果的同时执行其他工作：

BOOL fSuccess = GetOverlappedResult(data->hPipe, &data->oOverlap, &cbRet, FALSE);
if (!fSuccess) {
    if (GetLastError() == ERROR_IO_INCOMPLETE) return; // operation still in progress

    /* handle error */
} else {
    /* handle success */
}

通常，第二个选项比第一个选项更好，因为它确实如此不会导致您的应用程序停止并等待结果。（但是，如果代码在单独的线程上运行，则第一个选项可能更可取。）

ERROR_IO_INCOMPLETE is an error code that means that the Overlapped operation is still in progress; GetOverlappedResult returns false as the operation hasn't succeeded yet.

You have two options - blocking and non-blocking:

Block until the operation completes: change your GetOverlappedResult call to:

BOOL fSuccess = GetOverlappedResult(data->hPipe, &data->oOverlap, &cbRet, TRUE);

This ensures that the Overlapped operation has completed (i.e. succeeds or fails) before returning the result.

Poll for completion: if the operation is still in progress, you can return from the function, and perform other work while waiting for the result:

BOOL fSuccess = GetOverlappedResult(data->hPipe, &data->oOverlap, &cbRet, FALSE);
if (!fSuccess) {
    if (GetLastError() == ERROR_IO_INCOMPLETE) return; // operation still in progress

    /* handle error */
} else {
    /* handle success */
}

Generally, the second option is preferable to the first, as it does not cause your application to stop and wait for a result. (If the code is running on a separate thread, however, the first option may be preferable.)

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