命名管道读取超时 [英] Named-pipe reading timeout

问题描述

我正在尝试为我的命名管道的读取操作设置超时.
为了从命名管道中读取内容，我使用了ReadFile函数.
我读到可以使用SetCommTimeouts函数为此功能设置超时，但是当我尝试使用它时，出现系统错误1:函数不正确".
这是我的代码(这是客户端):

I'm trying to set a timeout to the reading operation of my named pipe.
In order to read from the named pipe, I'm using the ReadFile function.
I read that a timeout can be set for this function with the SetCommTimeouts function but when I try to use it, I get system error 1: "Incorrect function".
Here is my code (this is the client side):

m_pipe = CreateFileA(pipeName,   // pipe name 
                         GENERIC_READ |  // read and write access 
                         GENERIC_WRITE, 
                         0,              // no sharing 
                         NULL,           // default security attributes
                         OPEN_EXISTING,  // opens existing pipe 
                         0,              // default attributes 
                         NULL);          // no template file 

    if (m_pipe != INVALID_HANDLE_VALUE)
    {
            DWORD mode = PIPE_READMODE_MESSAGE | PIPE_WAIT;
            ok = SetNamedPipeHandleState(m_pipe, &mode, NULL, NULL);
            COMMTIMEOUTS cto;
            cto.ReadTotalTimeoutConstant = 1000;
            BOOL time = SetCommTimeouts(m_pipe, &cto);
    }

我做错了什么吗?或者SetCommTimeouts方法不应该与管道一起使用?还有其他方法可以使阅读超时吗?

Am I doing something wrong or the SetCommTimeouts method is not supposed to be used with pipes? Is there any other way to get a reading timeout?

推荐答案

您不能将SetCommTimeouts与命名管道一起使用.如果要超时，则必须使用异步I/O并使用CancelIo或CancelIoEx

You cannot use SetCommTimeouts with named pipes. If you want timeouts, you will have to use Async I/O and implement the timeout yourself using CancelIo or CancelIoEx

这篇关于命名管道读取超时的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！