How can I get things from website

[victor wang]

@jsulm
https://forum.qt.io/topic/77186/how-can-i-get-10-different-url

This is my new topic and i had describe it.
I will describe here for you again.
Please help.

i will send this commend for 10 times in the different CPID.

CPID="TOUCH";
URL="http://192.168.100.59/OLMS/TeskCheck.asp?LSN="+LSN+"&Empid="+EMPID+"&CPID="+CPID+"&CPKey=XXX";
manager->get(QNetworkRequest(QUrl(URL)));

But during the process it will return 500 instead of 200 and can't connect to the Url for the few times.
How can i solve this problem?

[jsulm]

@victor-wang HTTP 500 status code means: "500 Internal Server Error".
You should check using a browser whether these URLs are working.

[victor wang]

@jsulm
I'm sure it is worked because if i have just connect that one, it will work correctly.
But if it's in the loop and is not at the first one, sometimes will failed but sometime will success.
So that's why i doubt that because it sending too quick that the server cannot catch it well.

[jsulm]

@victor-wang Then it is an issue with your server - it is either too slow or it cannot handle concurrent requests.

[victor wang]

@jsulm
Did you see my code that i had just gave you?

I'm not quite sure that is the server issue.
I doubt that my code is not really perfect.
Could you help me see the code?

[jsulm]

@victor-wang Your do..while loop is an infinite loop if you get a response != 200
It does not make sense as a reply is either 200 or not: it will not become 200 if it wasn't before by some magic, so remove that loop.
As I said 500 means internal server error. You get a connection but the server fails to do what it is expected to do and sends 500 back.
If you want to slow down your requests you can use QTimer.

[victor wang]

@jsulm

If i change my code like this.

It will failed for a few times.

I'm trying to solve this kind of problem

[jsulm]

@victor-wang What does fail mean? Do you get 500?

[jsulm]

@victor-wang If you do not want to send all request in parallel you can do it one after another.

[victor wang]

@jsulm
Yes, it will show 500.

how to do that?
Could you teach me?

Or can i do 5 times and another 5 times.

[jsulm]

@victor-wang Put all URLs you want to get in a list.
Write a method which takes next URL from that list and sends a request.
Call this method in your button slot.
In the finished() slot you call this method again after handling current response if the list is not empty.

[victor wang]

@jsulm
Sorry it is too abstract for me,
Did you have an example?

[jsulm]

@victor-wang No, I don't have an example.
What is abstract here? I gave you a quite complete description.
What exactly is not clear?

[victor wang]

@jsulm
I don't know how to do it in the list and give a request.
I assume that i had a method function called getUrl();
And i will called it in the button.
When the replyFinished() slot is called from button.
Then i will call getUrl() again in the replyFinished() slot.

I this what you mean?

[jsulm]

@victor-wang

//In your class:
QList<QString> list;

// In your button slot
list << "URL1" << "URL2"<<...;
sendNextRequest();

void sendNextRequest()
{
    QString url = list.first();
    list.removeFirst();
    // Send request
}

// In your finished() slot
// Handle current request
...
if (list.size() > 0)
    sendNextRequest();

[victor wang]

@jsulm

Is the void sendNextRequest() able to put in the button slot?

When do i call my

manager->get(QNetworkRequest(QUrl(url)));

Is the finished() slot same as my replyFinished() slot?

[jsulm]

@victor-wang Yes, you call void sendNextRequest() in the button slot as any other method.
You call

manager->get(QNetworkRequest(QUrl(url)));

in void sendNextRequest() as I already said.
finished() signal is same except for these two lines (as I already said):

if (list.size() > 0)
    sendNextRequest();

[victor wang]

@jsulm

Thank you i had solve the problem
Thank you so much!!!!