How to catch curl error codes with system function in QT

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Hi,

I am working on API hitting using system function which is shown below.
I am working with Qt in the Linux environment.

ret = system("curl -m 60 --header \"content-type:application/json\" --data @/root/request.json MYURL -o /root/response.json");

Here system returns only 0 or -1 but I want to catch curl error codes.
Example :
6 Couldn't resolve host. The given remote host was not resolved.
7 Failed to connect to host.
28 Operation timeout. The specified time-out period was reached according to the conditions.

etc..

So can you please help me how to read this error from system function.

What I have tried:

ret = system("curl -m 60 --header \"content-type:application/json\" --data @/root/request.json MYURL -o /root/response.json");

Posted 2-Jun-19 20:50pm

Member 13740197

Updated 2-Jun-19 22:24pm

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Richard MacCutchan · Accepted Answer · 2019-06-02T22:25:00

Solution 1

You cannot do it from a call to system(3) - Linux manual page[^] . You need to send the curl output to a file and then read that when the command has completed.

Posted 2-Jun-19 22:25pm

Richard MacCutchan

Comments

Member 13740197 3-Jun-19 5:00am

I have already sent the output to a file /root/response.json. But this file is empty when curl error is 6 and 28 case. But my requirement is to read this error numbers.

Richard MacCutchan 3-Jun-19 5:06am

You need to redirect the error output (stderr) to a file. You can test this quite easily by running the full command in a terminal window.

Member 13740197 3-Jun-19 6:41am

Thanks for the answer