suppose, I have a file body1.dart where I created a variable "hello" which was initially empty!
String hello = "";
Now, in the same file, I have created a loop which will set and update the value of hello after every iteration!
Now the thing is whenever the value of "hello" get changed, I want to display that inside a Text Field which is in a different file body2.dart. I want to retrieve the real-time value at that exact moment! (Not the final outcome at the end of the loop)
Can you provide code snippet for this? So that we can best assist you.
Otherwise the best option would be to use a stream. You can have multiple dart classes subscribed to the same stream.
Streams provide an asynchronous sequence of data. Data sequences include user-generated events and data read from files. You can process a stream using either await for or listen() from the Stream API
Checkout official documentation from dart.dev
Related
I created an azure function in c # and set up an HTTP trigger. I'm interested in how to call this function from the flutter application. I don't need to transfer any special data because everything is already in the link I use to call the function.I’ve created a simplified view of the function to demonstrate what I want.
https://functionapp220220124204147.azurewebsites.net/api/Quercus?status=Off
When it calls this function all it needs to do is change the value of the variable from on to off
I know this is not the correct way to make a function and I should not have such variables, but this is just a simplified version
Here is a workaround given by Vikash Kumar in the Medium article regarding How to call Azure Functions API through Flutter App Code:
Created Wordle Website which has a list of legit words and allows you to input a word only from that list where we validate if an input word is a legit English word.
First, he created the Azure Cosmos DB > container in it > added a few dates, word pairs like:
Created the Azure Functions which has input binding with the Cosmos DB and gets a list of stored words on every request.
This functionality is broken into 3 segments:
Validate the input word (not null, same length, convert to uppercase both)
Check if both words are the same
Status of each letter in the input word.
The deployed function app API will be in this format: https://wordle-api.azurewebsites.net/api/CheckWord?word=
Also created the flutter in the composition of the word_field component which creates an input widget that accepts a 5 letter word in 5 boxes (1 each) which is similar to the OTP field.
And the home component builds a scaffold and puts together a page to accept 6 attempts for words.
The _checkWord handler calls the wordle-api, gets the color code, and updates the components accordingly.
Calling the Function API in the above handler and writing the code about response status and the user-defined message to the response.
var uri = Uri.https('wordle-api.azurewebsites.net', '/api/CheckWord', params);
For Complete Code, Please refer this article.
I have an endpoint, you can have información about products
{{URL_API}}/products/
If i perform a GET method over that endpoint i will obtain the information of every product
BUT i can also specify the product that i want to know about, i.e:
{{URL_API}}/products/9345TERFER (the last code is the id of the product, called SKU)
The problem is that if i want to make a CSV in order to update the information of different products i have to define a variable called sku in the endpoint so i will be able to pass the corresponding SKU
I want to create the variable {{sku}} but i do not understand how to do that.. i tried so many times and i failed, i've searched a lot but i do not really understand
Also, should i use ":" before the declaration of the variable? i mean:
{{URL_API}}/products/:{{sku}}
or simply:
{{URL_API}}/ns/products/{{sku}}
Can you help me?
I'm super lost :(
EDIT:
I want to perform a PUT method, i want to pass different values to the body and then.. send the request (it throws an error: 404 not found)
This is what i did:
PUT|{{URL_API}}/products/{{sku}}
body:
{
"tax_percentage":"{{tax_percentage}}",
"store_code":"{{store_code}}",
"markup_top":"{{markup_top}}",
"status":"{{status}}",
"group_prices": [
{
"group":"{{class_a}}",
"price":"{{price_a}}",
"website":"{{website_a}}"
}
]
}
CSV:
POSTMAN:
Your issue seems to be just a basic understanding of how data files work with variables in Postman, here's a simple example that will work the same way for you too.
This is a basic request I'm using to resolve the variable from the data file - It's a GET request but that doesn't matter as all we're look at here is using a data file to resolve variables. All you need to do is ensure the URL is correct and that you SAVE the request before using the runner.
Here's a simple CSV file created in a text editor. The heading sku in the name on the variable it will reference inside the Postman request. Each value under that is the value that will be used for each iteration.
In the Runner, select your Collection from the list (If you have more than one) then select the CSV file. Once imported, you will be able to see a preview of the data.
If that's correct, press the Run button. The Runner will then iterate through the file and pick up the sku value in the CSV file and use it in the request. I've expanded one of the requests so you can see that the value was used in the request.
I have this piece of code in JSON editor of Watson:
"context": {
"array": "<? entities['spare_part'].![literal] ?>",
"array_size": "<?$array.size() ?>"
When the input of the user, for example, is "Hello, I need a valve, and the part number of the valve is 1234", the size of the array ends up being 2 since the user mentions the word "valve" twice in his input. Some nodes are being executed depending on size of the array. For instance if the size of the array is 1, some nodes will be ignored because they are only executed only if the size of the array is 2.
I want the array to store only the inputs with different values, which is basically I don`t want the array to store the values of the same type, in my case 2 valves. If it is possible somehow please show me a way.
All that can be done, but the best approach depends on the overall system architecture. Remember that Watson Assistant is a conversation service, not a data processing platform...
You can process JSON in either Watson Assistant directly using the built-in methods and SpEL, see these links to get started:
- https://console.bluemix.net/docs/services/conversation/expression-language.html#expressions-for-accessing-objects
- http://docs.spring.io/spring/docs/current/spring-framework-reference/html/expressions.html
- https://console.bluemix.net/docs/services/conversation/dialog-methods.html#expression-language-methods
That would require some coding within the dialog nodes. It could be ok. What I would recommend is to either process in your app that drives the dialog (you need that app anyway) or to code up small server actions to transform data.
If it is the word you are looking for, you can use contextual entities to train for this.
As an example I created the following intent (along with general intents from catalog).
For each example I highlighted the "valve" word that is the one I am interested in, and added to the entity.
Now when I test it I get the following.
All this was done in a couple of minutes. For production level you may want to add more examples, or think about how you want to annotate.
I'm trying to crawl a site and to do so, I'm using Scrapy. So, when doing requests to nested pages, the procedure usually gets the the information correctly on the first trials, but, on later requests the nodes starts to return None. I'm using xpath's functionality. Below I'm pasting some lines of the parse function:
(I tried this one with the approach of explicitly comparing the class value)
title = response.xpath('//span[#class="inlineFree"]/text()').extract_first()
(With this one I used the contains function)
view = response.xpath('//span[contains(#class,"count")]/text()').extract_first()
(I've also used this one when I found more suitable)
comments = response.css('div.commentMessage > span::text').extract()
Am I doing something wrong on paths?
Is there any reason for the crawler to stop reading the nodes correctly?
Cannot say what the problem is without the log messages or the spider code but..
What happens most of the time is that websites fo not follow a strict html structure .For some properties the 'title' may be inside the span
but for the next iteration it may be
span[#class="inlineFree"]/h1/text() or or any other tag
so you should check the html for those returning None
What I'm trying to achieve is to intercept every write to a file and track the changes within the file. I want to track how much different the file content before and after the write.
So far in my minifilter driver I registered to IRP_MJ_WRITE callbacks and can now intercept writes to file. However I'm still not sure how can I obtain the content of the file before [preoperation] and the content after [postoperation].
The parameters that I have within the callback functions are:
PCFLT_RELATED_OBJECTS, PFLT_CALLBACK_DATA and I could not find anything related to the content of the file itself within these.
These are the operations that could change data in a file:
Modifying the file: IRP_MJ_WRITE, IRP_MJ_SET_INFORMATION ( specifically the FileEndOfFileInformation and FileValidDataLengthInformation information classes), IRP_MJ_FILE_SYSTEM_CONTROL ( specifically FSCTL_OFFLOAD_WRITE, FSCTL_WRITE_RAW_ENCRYPTED and FSCTL_SET_ZERO_DATA fsctl codes).
As for the content of the file itself that you just need to read it yourself.
If you mean the buffers as they are being written for example, check this out to find out more about the parameters of IRP_MJ_WRITE in the callback data. Esentially the buffer is at Data->Iopb->Parameters.Write.WriteBuffer/MdlAddress
Make sure you handle that memory correctly otherwise it will result a BSODs.
Good luck.