How can I get things from website

[victor wang]

@jsulm
Thank you for telling me!
But now i still get nothing.
I had check several time that i can wget the Url on the console.
And i'm sure it is the right subnet and Url.
And i checked the check.txt file can be write nor read.
Why it still print NULL out?

[jsulm]

@victor-wang show your code

[victor wang]

@jsulm
Here is the code for replyFinished() slot.

This is where i called the Finished() signal and replyFinished() slot via connect

[jsulm]

@victor-wang You cannot write in /home! (line 2019)
It should be /home/YOUR_USER_NAME/check.txt

[jsulm]

@victor-wang What do you get if you use wget with that URL? Any data?

[victor wang]

@jsulm
I will get a file like this.

i will get the file called "TestCheck.asp?LSN=201503003009&EmpId=we9999&CPID=OS&CPKey=95Z0000000AF"

And i can use vi to see the content inside like this.

I changed the path to /home/root/check.txt still got nothing in it.

[jsulm]

@victor-wang You should print out reply->error()
If everything was fine then it should print out 0 (QNetworkReply::NoError)

[victor wang]

@jsulm
It shows no error.
That means everything was fine.
But why still have nothing?
Is there any possible because i receive a file?

[jsulm]

@victor-wang Is that out variable a QByteArray?
Also, what exactly does qDebug()<<out print out?

[victor wang]

@jsulm
I declared it at the mainwindow.h here.

This is what it got here.

[jsulm]

@victor-wang can you do qDebug()<<out.size();?

[victor wang]

@jsulm

Yes, I can do that.
this is my code here

And it shows 0.
Is that mean there is nothing in it?

[JKSH]

@victor-wang said in How can I get things from website:

If it is how can i judge the signal and where do i have to add the function in?

You make a signal-slot connection, using QObject::connect(). When the signal is emitted, the connected slot will run automatically.

This is a core feature of Qt. I recommend you spend some time to do tutorials to understand how to use signals and slots.

For the first of debugging and testing.
I will get this on my browser. here

OK, good. That means the server will give you text data.

For the second one, i'm not quite sure what does that mean.

Your code has QUrl("http://192.168.100/59/..."). Change this to QUrl("http://lists.qt-project.org/mailman/listinfo") for testing.

For third one, what does"QNetworkRequest constructly correctly"mean?
I thought i am using the library that Qt have already constructed.

When you call QNetworkRequest(QUrl(...)); you are constructing a QNetworkRequest.

Let's check that your QNetworkReply is what you expect. Put this in your replyFinished() slot:

qDebug() << reply->isFinished();
qDebug() << reply->error();
qDebug() << reply->request();
qDebug() << reply->url();
qDebug() << reply->rawHeaderPair();

For forth one, I'm sure i am on the same subnet because i can send this commend to my console

wget http://192.168.100.59/PLMS/TestCheck.asp?LSN=201503003009&EmpId=we9999&CPID=OS&CPKey=95Z0000000AF

And i will get the file and the content will show "updated ok".

OK, good.

[J.Hilk]

@victor-wang

for your Xming copy/paste problem to windows, take a look to this topic:

https://superuser.com/questions/440128/xming-clipboard-only-works-one-way

That should enable you to poste your code as text for us and not as pictures.

[victor wang]

@JKSH
I add the qDebug in the replyFiniched() slot but i got some errors.
Here

Why is this happened?

[victor wang]

@JKSH
I have try to get from the Url which you gave me for test.
And i will get this information here.

So is that mean the code is not wrong?

[JKSH]

@victor-wang said in How can I get things from website:

@JKSH
I have try to get from the Url which you gave me for test.
And i will get this information here.

So is that mean the code is not wrong?

Yes, your code is working correctly. Go to http://lists.qt-project.org/mailman/listinfo using your browser and view that web page's source (Ctrl+U in Google Chrome) -- it's the same as your last screenshot.

Your code is not wrong. Your device (192.168.100.59) probably returns data in a different way. Fix the errors below to investigate.

@victor-wang said in How can I get things from website:

@JKSH
I add the qDebug in the replyFiniched() slot but i got some errors.
Here

Oops, sorry... QNetworkRequest can't be printed through qDebug(). Just delete this line: qDebug() << reply->request();

The other one should be rawHeaderPairs(), not rawHeaderPair()

[victor wang]

@JKSH

I had change the Url back to the original one.
And i get this

Is that mean i had receive something?
If it is why i didn't see any file that should get from the Url?

[JKSH]

@victor-wang said in How can I get things from website:

@JKSH

I had change the Url back to the original one.
And i get this

Is that mean i had receive something?

Yes.

If it is why i didn't see any file that should get from the Url?

Because your code contains the wrong URL. You want LSN=201503003009, right?

[victor wang]

@JKSH
Actually, if i connect success the URl i set will have the record.
But i just check it, there is nothing on it.
I don't know what to do now.