How to define input parameters for BytesAvailableFcn (tcpclient)

2023 1 16
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更新时间：2024 9 29
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Hy all,
my problem concerns the use of input arguments when I define the BytesAvailableFcn of a tcpclient connection.
I create a tcpclient connection:
t = tcpclient('address', port);
And I send a request to the server (which starts automatically to send data):
write( t, 'request' );
I want to have a callback function triggered by a bytes available event:
configureCallback( t, "terminator", @MyCallbackFcn );
MyCallbackFcn is written in a separated MyCallbackFcn.m file. The callback function MyCallbackFcn is triggeredd whenever a terminator is available to be read from the remote host specified by the TCP/IP client.
At the moment, MyCallbackFcn uses global parameters (var1, var2, etc.) defined in the main program:
function MyCallbackFcn( src, ~ )
global var1 var2
...
end
This algorithm works well. But in order to avoid the use of global parameters, I would like to define input parameters for MyCallbackFcn fonction. My problems start here, because I do not find the right form to write:
  • the definition of the callback function in the main program : configureCallback( t,...
  • the function MyCallbackFcn in the MyCallbackFcn.m file
Thank you in advance for your help.
Raphaël

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Walter Roberson
Walter Roberson 2023-1-16
编辑：Walter Roberson 2023-1-17

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Raphaël Rouveure
Raphaël Rouveure 2023-1-16
Thanks for your answer Walter.
I read the Matlab documentation about "parameteriring functions" that you have indicated. This topic explains how to store or access extra parameters for mathematical functions that you pass to MATLAB® function functions, such as fzero or integral. But I want to use a function which is not a MATLAB function, so this solution seems to by not adapted to my problem.
Walter Roberson
Walter Roberson 2023-1-16
configureCallback(t, @(src,event) MyCallbackFcn(src, event, var1, var2)
function MyCallbackFcn(stc, event, var1, var2)
Raphaël Rouveure
Raphaël Rouveure 2023-1-17
Hi Walter,
thanks for the two lines of code, it works fine!
I knew it was possible to use input parameters with the configureCallback function, but I couldn't find the correct syntax...
Nitin Kumar
Nitin Kumar 2024-9-28
In the syntax correct for the first statement?
Walter Roberson
Walter Roberson 2024-9-28
编辑：Walter Roberson 2024-9-29
@Nitin Kumar
configureCallback(t, @(src,event) MyCallbackFcn(src, event, var1, var2)
is correct syntax for configuring a callback to MyCallbackFcn passing in two extra parameters, including var1 and var2 . The var1 and var2 values would be "captured" at the time the @(src,event) was processed -- any changes to var1 or var2 made after that point in the code would have no effect on the configured callback.
Nitin Kumar
Nitin Kumar 2024-9-29

We need to pass the "terminator" argument. Also, a closing parenthesis is missing.

configureCallback(t, "terminator", @(src, event) MyCallbackFcn(src, event, var1, var2))

Just small things but took me some time to figure out. Thanks.

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