I need to know how to read (sync or async doesn't matters) with a timeout. I want to check if a device is connected with a serial port or not.
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Assign an existing native serial port to the serial port. Start an asynchronous read. Start an asynchronous write. Construct a basic_serial_port without opening it. Construct and open a basic_serial_port. Construct a basic_serial_port on an existing native serial port. Telnet client using boost asio TCP network code. I have changed this code to turn it into a simple serial terminal application using the serial port support in the new version of boost asio. It required no changes at all the the read or write code. I just altered the initialization to use a serial port instead of a socket. I've made a small interface using the asio C++ library to open serial ports and do I/O from/to them. It works with my Arduino Uno and other hardware as well (industrial weighing machines), but I only specify the port and baud rate. Boost::asio::serial_port ã® read_some ã使ã£ã¦ ã·ãªã¢ã«ãã¼ãããèªãã éã«ï¼ä¸ç¬ã«ãã¦EOF Exceptionã æãããã¾ããï¼ããã¤ã¹ãã¡ã¤ã«ã®ãã¹ããã¼ã¬ã¼ãã権éã æ£ããã¯ããªã®ã«ãªãã§ã ããï¼ï¼ã¨æã£ã¦èª¿ã¹ãã®ã§ã¡ã¢ï¼ what(): read_some: End of file 解決æ³1. Next message: Green, Jason M NSWCDL, W33: 'Re: [Boost-users] Linking with dynamic boost thread library'. [Boost-users] [ASIO] serial_port read seems to lost.
For that I use
asio::write and then I wait for the response of the device.
If a device is connected
asio::read(serial, boost::asio::buffer(&r,1)) works fine but if there is no device the program stops, which is is why I need the timeout
I know that I need a
deadline_timer but I have no idea how to use it in the async_read function.
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I know that there are many similar threads and I read lot of them but I can't find a solution that helps me solving my problem!
dsolimano
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Chris K.Chris K.
4 Answers
The code posted by Igor R. did not compile for me. Here is my improved version of his code, which works perfectly. It uses lambdas to get rid of the
set_result helper function.
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Robert Hegner
Serial Port Adalah![]()
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You don't use
deadline_timer in async_read . But you can start two async processes:
Code:
VikasVikas
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Once upon a time, the library author proposed the following way to read synchronously with timeout (this example involves Igor R.Igor R.
tcp::socket , but you can use serial port instead):
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There's no one or easy answer per se, since even if you do an async read, the callback never gets called and you now have a loose thread somewhere around. Rational rose 98 software download.
You're right in assuming that
deadline_timer is one of the possible solutions, but it takes some fiddling and shared state. There's the blocking TCP example, but that's for async_connect and there's a cool thing about it returning when it has nothing to do. read won't do that, worst case scenario -- it'll crash & burn 'cause of the invalid resource. So the deadline timer thing is one of your options, but there's actually an easier one, that goes somewhat like this:
Basically, do the read in another thread and kill it off if it times out. You should read up on Boost.Threads.
If you interrupt it, make sure the resources are all closed.
TC1TC1
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