waitForReadyRead returns empty string - Why isnt it blocking?

Question

I currenlty have a blocking model and the code where my client receives data is as follows

QByteArray tick_stream;
clntSocket->waitForReadyRead(-1);
tick_stream = clntSocket->read(800);

Now I believe clntSocket->waitForReadyRead(); should only unblock when there is data to be read from the socket however it seems that it unblocks by itself and tick_stream is empty any suggetsions on what might be going wrong ?

score 2 · Accepted Answer · edited Jun 20 '20 at 09:12

2

You should check for errors, because it can happen that the method will return immediately on error.

From QtDoc:

bool QIODevice::waitForReadyRead(int msecs) [virtual]

Blocks until new data is available for reading and the readyRead() signal has been emitted, or until msecs milliseconds have passed. If msecs is -1, this function will not time out.

Returns true if new data is available for reading; otherwise returns false (if the operation timed out or if an error occurred).

edited Jun 20 '20 at 09:12

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answered Aug 12 '13 at 15:00

bash.d

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Yes it is returning false. How do i detect the type of error or extract the error message ? – Rajeshwar Aug 12 '13 at 15:06
Please consult the documentation, I am not very used to Qt. There definitly is something. – bash.d Aug 12 '13 at 15:45
What actually hapened? – bash.d Aug 12 '13 at 19:02

waitForReadyRead returns empty string - Why isnt it blocking?

1 Answers1