Make QNAM not sent any new request, until the last requests' response has arrived.

Rizwan94

Hello,
I am working on a Qt application using C++.
I need to make http requests through my application, so i am using QNetworkAccessManager for the REST api calls.

I need the asynchrounous behavior which the QNAM provides, but there is one use case in which i would like the QNAM to wait and not sent any new requests, until the last requests has returned.

How do i acheive that?

SGaist

Hi,

Can you explain how you define that the QNAM has to start waiting ?

JKSH

@Rizwan94 said in Make QNAM not sent any new request, until the last requests' response has arrived.:

i would like the QNAM to wait and not sent any new requests, until the last requests has returned.

Each time you get a completed reply, the QNetworkReply object emits a finished() signal.

Make your app listen for these finished() signals. Do not call QNetworkAccessManager::get() or post() until you have received the last signal.

Rizwan94

@JKSH Thank you for your response.

I am currently connecting to the replyFinished signal of the QNAM but not the QNetworkReply.
I will try if your suggested approach works fine with replyFinished of QNAM.

Also, I am concerned if the UI hangs when I am not processing any further requests.
Example :
When button1 is clicked, I send the request1 and wait for the response. What if the user in meantime clicks on the button2 which does another request2 ? Won't the UI hang?

Am sorry for adding multiple questions in this comment.
Let me know if you need further info

jsulm

@Rizwan94 said in Make QNAM not sent any new request, until the last requests' response has arrived.:

I am concerned if the UI hangs

If you're using signals/slots then the UI will not hang (do not wait "actively" using any "wait*" methods or loops).

"When button1 is clicked, I send the request1 and wait for the response" - how do you "wait"? With signals/slots you do not have to wait and block anything.