Working with APIs in QT5?

[Mijaz]

Hi everyone!
Do I need your kind help in getting started with APIs in QtCreator?
Kindly suggest good helping materials or examples start from basics to advance level?

[jsulm]

@Mijaz You question is not clear.
What APIs do you mean?
Are you asking how to design APIs?

[Mijaz]

@jsulm Yes, I need to design the custom API?

[jsulm]

@Mijaz This is a very broad topic. And you did not provide any details (is it a C++ API, REST API,...? Does it have to be synchronous or asynchronous?).
One example of APIs is Qt itself.

[Mijaz]

@jsulm Thanks for your kind reply!. I want to design the API for AD9361 which is of the ADI brand. I want to use this API standalone to access the internal register for reading and writing values of frequency, RF bandwidth and hardware gain, etc. which will be written on the register inside the board.

[SGaist]

Hi,

How do you connect to that device ?

[Mijaz]

@SGaist I connected the device via ethernet.

[SGaist]

So you want to provide an API that will interface with your device through a TCP/IP connection ?

How do you get the data out of it ?

[Mijaz]

@SGaist Yes I will interface the device with API through TCP/IP and will get the data through it inside API and change the settings of the device using API like TX and RX LO frequencies and RF bandwidth discussed in this link (https://wiki.analog.com/resources/tools-software/linux-drivers/iio-transceiver/ad9361). Now come to my point on how I will start designing the API for the above-said topic.

[Christian Ehrlicher]

@Mijaz said in Working with APIs in QT5?:

Now come to my point on how I will start designing the API for the above-said topic.

How should we tell you how your api should look like? Think about what you want to do and then create the corresponding functions for them.

[Mijaz]

@Christian-Ehrlicher I need to store the data like frequencies values in qt and want to load these values onto the devices when needed? Tell me how I can do it in my qt application for storage and reuse of them?

[jsulm]

@Mijaz said in Working with APIs in QT5?:

Tell me how I can do it in my qt application for storage and reuse of them?

What is the problem with that? Use some data structures and variables to store all needed information. There is nothing special...

[Mijaz]

@jsulm Thanks for your reply! Kindly give me some sort of example?

[JonB]

@Mijaz
He can't. You have to design this yourself, it's called programming. Read/write the data between the device and the Qt program over TCP/IP. Presumably using QTcpSocket. Although it's not the same case as yours, there is a TCP client example at https://doc.qt.io/qt-5/qtnetwork-fortuneclient-example.html which should illustrate the principles.

If you only want data in memory you need to design suitable structures to hold the data received/sent.

[JonB]

@Mijaz said in Working with APIs in QT5?:

@jsulm Thanks for your reply! Kindly give me some sort of example?

Example of a data structure? Here's one:

struct Data
{
    int something;
};

[jsulm]

@Mijaz said in Working with APIs in QT5?:

Kindly give me some sort of example?

What example? How to declare a data structure? How to define a variable? Sorry, but this is Qt forum and you're asking absolute basic programming questions.

[Mijaz]

@JonB I have no problem with TCP/IP communication. I am facing the problem to store the data and reuse from the qt application with the device.

[Christian Ehrlicher]

Again: this is nothing Qt specific on how you store your data. It's basic, plain C(++) on how to create a structure and store/access data in there.

[JonB]

@Mijaz
You asked for an example of a data structure so I gave you one.

Storing data and reusing it (in memory) is just C++. Qt is not a programming language, so do whatever you would do in C++.