I need to get alot of data from my database and would like to get this when the application starts, store it in a collection and to reuse through out the application.
I tried declaring a Public Shared Collection and populate this when I start the application (in the main form). It works ok first time the collection is used, but then it is empty.
I have looked around for places where I might have written to clear it myself but can't figure anything out. Anyone have any ideas or tips?
The code is something like:
Public Shared m_objDocCollection As Collection(Of clDocumentation)
And then in the main form
clDocumentation.m_objDocCollection = clDocumentation.GetDocumentsFromDb()
Edit; sorry for not adding code. Have copied the most relevant and placed here; https://gist.github.com/2365610
It is not obvious from your code what is happening but my guess is that you are (re)initialising your collection more than once.
Do a search in your code for any places where the collection is being (re)initialised such as this:
m_objDocCollection = New Collection(Of clDocumentation)
and put a breakpoint on these. Then run your code and see when these are firing.
Related
Relatively new to coding and have taken up lots of small projects to help learn the basics, and I have now set myself a challenge of a "bigger" one. Essentially I want to recreate the Message Box but with my own styling and customisable elements.
I have got the basics in a class and created it, however I want the class to have two options.
1) load all the details from an XML file for the message, I have done this and that works.
2) I want it to be like the standard message box where you can pass in parameters.
My question is, How can I achieve number 2.
I have tried adding details into the Show/Load subs but no luck, the only way around it I can see is with properties but that would take too long.
I want to be something like the below.
classname.show("message","tittle",icon,"buttons",imagefile,"caption")
However alot of my code is done in the load method as opposed to show, so it needs to be visible / accessible there.
Any help / advice would be appreciated.
Properties are definitely the way to go. It also makes sense: Conceptually, the message being shown is a property of the message box.
Your Show method would look like this:
Public Shared Show(message As String, title As String, ...)
Dim box as New MyMessageBoxWindow()
box.Message = message
box.Title = title
...
box.ShowDialog()
End Sub
In the Load method of MyMessageBoxWindow, you access these properties and configure the UI elements.
I have a form that is supposed to create an entity of type Load, but for some reason, doesn't seem to be actually passing or seeing any of the data related to associations of the entity (load.user, load.client, etc). This all used to work fine but stopped working at some point during a bunch of refactoring (that didn't change any of the fields in any of the models). Now all of the forms in my website have broken the same way and I have no clue where to even look to start fixing it.
From the view, I submit the form for a new Load, printing out the data everywhere I can along the way. Printing out the data being sent to the server before it's sent shows all the data is there like it should be. Printing out Form.form(Load.class).bindFromRequest() in the controller shows the form's data contains everything needed, for example, the value user.id=1 is in the data. However, there is also a validation error saying that the user is missing. How can this be?
Form(of=class models.Load, data={ a bunch of stuff, user.id=1, a bunch more stuff}, value=None, errors={=[ValidationError(,Logged in user is missing or invalid.,[])]})
The validation error is being generated by public String validate() in the Load class, which is simply checking if(user==null) and returning that string if it is. I should note that every form that submits multiple entities (for example, submitting a Dock and then also the Dock's Location) only saves the main entity (in this example, the Dock) and ignores all others (the Dock's Location is never saved, even though Dock cascades in the model to also save the Location). All of our form fields are labelled correctly, this code did used to work at some point before it mysteriously stopped working!
So why did all of my forms suddenly stop correctly dealing with anything but the main model for the form? It is as if they cannot even "see" the data contained in bindFromRequest(). If I print out a variable in the validation method of Load, such as this.status, it prints the correct thing. But if I try to print something like this.user.id or this.client.id I get a null pointer error. Where is the code in Play that actually interprets the data (user.id=1) and turns it into the User associated with the Load, and how could it be breaking?
Edit: Also, yes, I did try "play clean", it was the first thing I tried since usually it fixes weird errors like these! But this time, no dice.
Edit2: I'm including the html from the form, in case it is helpful.
<input type="text" id="user_id" name="user.id" value="1" class="idfield">
Edit3: The only change I made during the refactoring that might have influenced this is that I had to make some setter methods like Load.setBroker() because the ones that are supposedly generated by Play didn't work. For example, load.broker=aBroker would not have set the Load's Broker before, so I had to make a public void setBroker(Broker broker) method in Load. Does Play use the auto-generated setters to bind the data? Could overwriting them cause problems?
Whoops, I figured it out. It was the setters I had written. Some of them were set to private purely by mistake, and apparently this was preventing Play from setting the values when binding the data. Changed them all to public and the mystery error vanished.
I defined a class called "FilterCriteria" which has a bunch of function .m files (getAMask, getBMask, etc.) associated with it. When I create the FilterCriteria object and call the functions using it, I don't have any problems. However, recently I added another function (which, on a side note, is almost identical to another function that still works), and Matlab returns the error, "No appropriate method, property, or field getHMask for class FilterCriteria."
I've searched online for this problem, but I can't find anything. The file getHMask.m is definitely in the correct folder, so I don't understand why Matlab seems to have such a problem finding it.
Here's getHMask.m's header:
function mask = getHMask(object, quadrant, channel)
Any help would be greatly appreciated. Thanks in advance.
1) A mistake I make sometimes is not saving the file with the correct name. Make sure capital letters are in the right places etc!
2) Another layer of error checking here... You can call methods('object here') (see here) and make sure it lists the method (function) that you are trying to add to it. If it doesn't show up here you should check into the implementation of the method and make sure it's correctly being added to the class you're using for your object.
I had the same problem that's kind of suggested by Ben's bullet #2 and it was driving me crazy. Turns out MatLab wasn't loading the latest version of my class's m-file. I vaguely remembered it gave me a warning earlier about that, because there were old instances of the class in the workspace and to keep from invalidating them it said it wouldn't update the class until I cleared the workspace...
So if that's the problem, restarting MatLab will work, or you can just enter >> clear
I want to create a new object so as to instantiate and use it several times;
For example, if I want to create an object that has a label and a button inside, how do I? I created a new NSObject but inside it has nothing, then how do I make everything from scratch since there was a viewDidLoad for example (obviously, since it has a view)?
thanks!
Your questions lead me to think that you're really just starting out. There's nothing wrong with that, but rather than trying to summarize several megabytes of documentation in a few paragraphs, I'm just going to point you to the iOS Starting Point. I think that you're just trying to create a container that can hold other UI components? If so, use a UIView for that. However, don't jump in and try to get something specific done without first reading through some of the Getting Started documents -- you'll just end up back here, and we'll just point you back to the docs. You might like the Your First iOS Application guide, as that lets you get your feet wet but explains things along the way.
I have a program that is getting pretty big and it is a pain to find everything through all the functions and classes.
I am trying to break it up into other files based on their method.
Some of these functions have calls to others in the main class. I changed most my functions from private to public to access this. I had problems calling certain code created windows so importing mainwindow helped that.
My last problem is editing the mainwindow ui from one of the module files. I want to make sure im on the right page before i continue breaking it up. My only guess is that anything they updates the ui should be left on the main class.
Thanks
The only code in your form class should be code that talks to other classes and updates the UI based on data from other classes.
Depending on your application, the form class might handle change events from other classes to update the UI or pass user input to other classes in Change or Click events.
A couple options:
Use callbacks into the your main window.
Create events for when you need the form updated. Your program logic raises the events, and your main window class can consume them.