I'm trying to write a class method which recieves a string and prints it.
I've tried this:
log: aMessage
Transcript show: aMessage; cr.
and tried to use it as follows:
ContractObject log: 'aaa'.
(ContractObject is the name of class) but it didn't work.
I'm assuming it has something to do with the fact that it's a dynamic language and that it's not known that it's a string.
I tried to convert it etc. Nothing worked.
No, types are definitely not the problem here. What do you mean by "it didn't work"? What was the error message you got? Did you get any at all?
Do you have the Transcript open? If it's not open you wont see anything. You can open it programmatically by evaluating Transcript open or manually by using the menu.
Also, make sure that you have implemented #log: on the class side (that's what you see when you click the class button in the code browser).
Related
In a Dolphin smalltalk treeview I'd like to use a custom icon, depending on the state of the item displayed, (differente state, different icon)
How can I do that ?
I cannot really understand how to use a "my" icon.
I've create a class "connection", with an instance variable "connected"
and two class methods "connectedIcon and unconnectedIcon that returns icon images.
Then an instance function "icon" that returns one or the other image based on the connection state.
I can add instances of this class to a tree view and see the name of the connections.
But how to show my Icons ?
I tried to sustitute the getImageBlock of my presenter view with the following expression [:obj | obj icon] but it doesn't work.
(nothing seems to happen).
this is made in my presenter initialize :
initialize
super initialize.
treePresenter view getImageBlock: [:obj | obj icon]
what's wrong with it ?
best regards
Maurizio
When you are editing a TreeView, one of the properties is getImageBlock. By default it is not really a block but another object that understands the message #'value:' (the class IconicListAbstract). You can replace this property with a code block (or other object that understands #'value:') and answer the image you want displayed.
In Microsoft Windows, icons are typically stored in a DLL. You should be able to use an icon explorer or editing tool to see the icons in a dll. For example, get IconExplorer from http://www.mitec.cz/iconex.html and try opening DolphinDR7.dll. Do the icons and numbers match what you see when you return a number in your application?
To determine (or override) the resource library used, see SessionManager>>#'defaultResLibPath'.
Typically, the getImageBlock is set using the property editor in the GUI editor, but setting it through code can work as well.
Wonderful Dolphin Smalltalk!
I had two problems
1) how and where to modify the getImageBlock method of my Treepresenter.
2) where to put the icons ad how to get the imageindex of each icon.
This is the solution :
1) it's not needed.
The treeview sends an #iconImageIndex" message to my model
this is handled by the default method (in the Object class) that send to my object the message #icon
and to the result of this message (an icon) the message #iconIndex.
This message is understood from the icon that answers with its own iconIndex.
So the only method I need to impement is #icon in my class Connection
that I implemented as follows:
icon
opened ifTrue: [^Connection connectedIcon] ifFalse: [^Connection unconnectedIcon]
In the class itself the two icons are imported in the image by evaluating the createIconMethod,
as explained in the blog article 'Beauty with less Beast'.
So my problems are solved.
Thanks to all.
Maurizio.
I broke something in my Pharo image, but i don't know exactly what. Now when I try to file-out my package to insert in a new image, I only see 'Why you see this menu' and 'Debug'. If I run menu debug in the playground, I get a FallbackMenu.
How can I fix this error?
EDIT: When I try to click on my package, The system browser is acting very weird an the following error pops up: link
Using Max's your code, i get 2 nil keys:
The first one is a mistake in my code (I assigned a class binding to nil instead of a instance variable with the same name). But I can't edit this because I can't access it through the System Browser.
The second one is ActiveEvent. I don't know where this comes from and whether this or the previous nil causes the System Browser to act weird
One possibility is that you nilled a class binding. Inspect the following to get a list of keys and values that are nil:
Smalltalk globals associations select: [ :assoc |
assoc value isNil or: [
assoc key isNil ] ].
BTW: rather then attaching a screen shot it would help if you attached the stack. To get the stack trace, right click on the topmost entry in the stack list (the one that's selected in your screen shot) and select "Copy to clipboard". Then paste the contents (or at least the first 30 frames) here.
Update
ActiveEvent seems normal. I have the same. The second one is very likely problematic. You may be able to cheat your way out by removing the entry:
Smalltalk globals removeKey: nil.
If done a quick try and it seems to work.
Suppose I have an object of class RandomClass with a method doStuff() which returns an int.
I'd like to do something like this:
Type myObject.doStuff()
Do something which creates a local variable of the type returned by doStuff() (int in this case)
Right now I do that by first typing myObject.doStuff(), use Alt+enter to popup the "Introduce local variable" menu and then use that.
Can I do that faster ?
Thanks.
You can type myObject.doStuff() and then press Ctrl+Alt+V to immediately create the local variable. You will directly bypass the pop-up and that is really all you gain.
You can simplify the key mapping to reduce the number of keys to press for the Extract Variable if it is really necessary.
Generally, no, that's the quickest way to do it.
Given that the doStuff method already exists, I could do what you described with 6 keypresses in about a second and a half. That's pretty quick, I would think...
On the other hand, if it's boilerplate code that you'll be typing over and over, you could consider making a custom Live Template - hit ctrl-j and type something like sout or psvm to see some examples...
Good luck!
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
Is it possible to access the properties of objects in xCode console?
If I try the following I get an error that he property doesn't exist.
po someObject.someprop
If I don't breakpoint the code and run the app it works fine so I know someObject.someprop exists. I don't think I have the grasp on xCode console yet? What I loved about Flex/Flash development is that I could set a break point and in the console window or variables view I could traverse every structure down to the ends of the earth.
I could see SomeDicionary[key].someArray[1].someObject.prop and it would show me the value. Is this not possible in xCode console or is there a trick to get to it?
You'll actually have to use the bracket syntax notation:
po [someObject someprop]
The debugger is sometimes very finnicky about syntax. This is filled with all sorts of helpful tips for debugging in XCode.
Just a side note, variables/properties declared in the implementation file (*.m) instead of the header file (*.h) can sometimes be invisible to the debugger variable list display depending on if the breakpoint is in that class's code, because of scope. Not necessarily required here, but useful to know seeing as how it is kind of relevant.