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We will be creating a web page to add two numbers together.
The data processing adding the numbers will be done within LabVIEW, and sent back to the web page where it will be displayed.
If you are new to the web, you might want to check out the introduction on the.
Setting up the Project Before we even open LabVIEW, let's create a file hierarchy to organize the files we will be creating in this 2 />In Windows Explorer, create a root directory for the project, such as "Add Two with Submit", and create empty new folders resembling the names below.
When building a web page, we separate the files into public and private content.
While in this tutorial, we читать полностью only be creating public content, it is a good practice to also have a place Private Content folder to house the files or code that will be running behind the scenes on our web page.
Give the web service a name such as "WebService".
The name of the web service will be a part of the URL address of any web pages it hosts.
This will open a window where you will then navigate to the folder that we created earlier.
Create an HTTP Method VI 2 right clicking on the Web Resources folder and selecting New VI.
This will create a VI that is designed to take web requests.
Open a text editor, and create a new text document.
This will save the file as an HTML file instead of a text file.
Save the file in the Public Content folder we created earlier.
These files should be automatically added to your LabVIEW project.
Your project should now look as shown below.
LabVIEW Code We will now create the LabVIEW code for our web page.
The LabVIEW HTTP method VI will receive data from the webpage, perform data processing within LabVIEW, and then return the data.
The format that we will send data to the webpage is in URL form 2 />This is what the URL will look like for sending two numbers.
To read this data in LabVIEW we will use the Read Form Data function.
Drop this function onto the block diagram and wire the Web Service Request control into the left side of the function.
Next, create a constant for the key input of the function.
The key is the name of the variable in the URL to read.
Your block diagram should look like below.
The data is read in as a string, so we will need to convert it into a numeric data type.
Use the Scan from String function to scan and convert the string into a double as follows.
Then add the two numbers together.
We will need to convert the result of our addition to a format that we can send back to the web page.
For this example, we will be sending the data in JSON format.
JSON is very similar to LabVIEW clusters.
In a JSON object, each piece of data has a key.
We will be using a function that converts LabVIEW clusters into JSON objects.
Drop a cluster constant onto the block diagram.
Then drop a double numeric constant into the cluster.
Now drop a Bundle by Name function and connect the cluster to the input.
Wire the result of the addition into 2 sum.
Your code 2 look like below.
Use the Flatten to JSON function to convert the cluster into a JSON object.
Now that we have converted the data to the correct format, we will send the data back to the web page.
Before we send the data, we need to tell our web service what the format of data we are about to send.
Connect the web service request into the function.
Create a constant for the MIME type input.
From the same Output palette, drop a Write Response function.
Wire the web service request into the function.
Finally, wire the output of our Flatten to JSON into the response string input.
Your final code should look like this.
Our LabVIEW code is now completed, but there are still some configuration options that we need to change.
By default LabVIEW uses the terminals of the HTTP Method VIs to send and receive data, but we are using a different method since we want to use the JSON format.
In your LabVIEW project, right click on your web service and select Properties.
Go to the HTTP Method VI Settings tab on the приведенная ссылка side.
Select it and go to the Output адрес tab of the properties.
Now select the Stream option.
Click OK to save the settings.
This is all we will need to do on the LabVIEW side.
Now, we will work on building the webpage in HTML.
HTML Code The HTML code takes care of most of the visual aspects of a web page.
It is similar to the front panel of a web page.
We will be making some controls to enter numbers, and an indicator to display our results.
Copy the following code into your HTML file and save the file.
This file is analogous to the view element of a traditional Model, View, Controller application architecture.
This completes our HTML code.
Again, we suggest using Notepad++.
This file is analogous to the controller element of a traditional Model, View, Controller application architecture.
Then it writes that data into our result indicator.
That concludes the coding portion of this tutorial.
A deployment window will pop up.
This window will automatically close when the web service is published successfully.
We will need to get the URL of our web page.
This will show address of our webpage.
Copy this address and enter it into your web browser.
You should now see your webpage!
приведенная ссылка numbers into the inputs and click submit to see the 2 />Now you have a working LabVIEW Web Service web page.
Congratulations on making it through this tutorial!
One more thing: What if we want to view the web page on another device?
First make sure that your second device is connected to the same network as the computer running the читать далее service.
We will need to slightly change the URL of the webpage that we used earlier.
Notice that in the URL we copied into our browser before, it used the IP address 127.
This worked earlier since the web browser приведу ссылку the web service was running on the same machine.
However, if you tried to use the same URL on another device, you would get an error, because the web service is running on a different machine that the web browser.
We will need to change the IP address of the URL to the IP address of the computer the web service is running on.
On the computer running the web service, open a command prompt window.
Type ipconfig and press enter.
Write down the IPv4 Address of the computer.
On your second device, type in the same IP address of the web page we used earlier, but replace 127.
Now you have multiple devices connected to your LabVIEW Web Service web page!
I just went through it step by step, and I appreciate the way it builds the entire project from scratch.
Good linking to other content too.
I just modified it a little bit to make it clear from the very beginning that we are building a tutorial from scratch overview section.
I also was a bit confused about the file directory bit, so I reworded that paragraph too.
Thanks again for creating this helpful tutorial.
Hi Daniel, Great 2 for the labview users.
I tried the example but i cant calculate them.
Thanking you, Regards, Krish Hi Krish!
Did you follow the tutorial or are you using the zip file example?
Try entering this url.
You should get the result for 2+4.
Do i need to change the name?
Hi Krish, If you download the zip file and try running the web service does it work?
The URL just needs to match up with the name of the web service, method, and connector pane items.
This tutorial is absolutely brilliant.
I want 2 emphasize how much I appreciate the tutorial's clarity and step by step procedure - I loved it!
Thank you very much for this outstanding piece of work.
It only works when I build an application and run the VI as an application that I can see the number on the website.
Does anyone know why, or if I'm doing something wrong?
If I diagram disable the notifier and just replace it with a constant, it starts working from 2 code Hi, it is a very nice and helpful tutorial.
I have a few questions: 1.
Can I access the web page from a device which isn't on the same network as the PC with the page is, if I have a public IP address on the PC where the page is located?
What should I do if I want to access a cRIO controller at this way?
Where to place the web page?
Just download it to the controller with the LabView code, or?
If I can do that, do I just need to set the public IP in the cRIO and connect it to the network?
Or, I need a server PC on which is placed the web page and the cRIO connected to this PC via RS232?
I would like to develop a system which is controlled by cRIO but users would access the system via web browsers.
It can be done at that way with an Arduino microcontroller, I have made a few applications that way.
In that case the page is on a MicroSd card and the Arduino has the public IP, so I was wondering could I do this with cRIO.
Brian, Yes it's possible to access the page over the internet, though you may want to consider security before doing so.
You would run the code on the cRIO, and the cRIO would host the webpage no need for a PC.
I'm able to get it running from my host computer and another computer on the network.
But I can't seem to get it to run on iOS.
Does it work for anybody else in iOS?
I've tried both Safari and Chrome on my 2 and it is timing out.
Hi Daniel, Thank you for this tutorial.
I followed step by step and it did work.
I will be on a project to write a js and LabView vi to communicate with a machine through webservice.
As the machine can only be accessed with webservice.
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Again, thanks for your work on teaching people how to do things like this project.
Is it possible to open the page in the LabVIEW ActiveX WebBrowser?
I tried but I failed.
The service is not responsive.