Scratch

sparks · 2010-12-06 12:43:46

Hi all,

Since I've started messing around with the smalltalk code, I think I've developed a small understanding of how to make blocks, which I know isn't much, but I've heard other people ask this question too, so thought I would post a thread for it.

how do you get a C block to do something after the contents has been run? Specifically, I want to write text to a file once a loop starts and again when the loop ends so that rather than a block called <html> with the code

self writeText: '<html>' toFile: 'C:\Program Files\output\output.html'

and a second block called <html /> with the code

self writeText: '<html />' toFile: 'C:\Program Files\output\output.html'

I can just have a loop block that writes the first message at the start, and the second when the loop finishes. Html is just an example, I plan to use it to create blocks for programming microships, but you get the idea smile

any thoughts as to how this is done? Is it possible in Panther?

TheSuccessor · 2010-12-06 14:05:06

| block args |
block _ stackFrame expression.
args _ stackFrame arguments.
(args size = 1)
ifFalse: [
writeToFile: '<html>'.
self pushStackFrame: (ScratchStackFrame new expression: (block firstBlockList)).
stackFrame addArgument: 'temp'.]
ifTrue: [
writeToFile: '</html>'.
self popStackFrame.]

Replace writeToFile: with your file writing method.

(This works, I used it in my mod of Web Blox)

Daffy22 · 2010-12-06 14:49:07

TheSuccessor wrote:
| block args |
block _ stackFrame expression.
args _ stackFrame arguments.
(args size = 1)
ifFalse: [
writeToFile: '<html>'.
self pushStackFrame: (ScratchStackFrame new expression: (block firstBlockList)).
stackFrame addArgument: 'temp'.]
ifTrue: [
writeToFile: '</html>'.
self popStackFrame.]

Replace writeToFile: with your file writing method.

(This works, I used it in my mod of Web Blox)

So your modding web blox tongue . Feel free to but please give credit. big_smile

sparks · 2010-12-06 15:25:49

thanks! One problem, I tried it in Panther and it failed. (as a custom block)

here's my code:

Code:

| block args |
block _ stackFrame expression.
args _ stackFrame arguments.
(args size = 1)
  ifFalse: [
    writeText: 'if ', t1, 'then','
' ToFile: 'picaxe out.bas'.
    self pushStackFrame: (ScratchStackFrame new expression: (block firstBlockList)).
    stackFrame addArgument: 'temp'.]
  ifTrue: [
     writeText: 'endif'
' ToFile: 'picaxe out.bas'.
    self popStackFrame.]

have I made a mistake?

TheSuccessor · 2010-12-08 11:48:37

Oh. It won't work in CYOB I don't think, as it runs in Scratch-Execution Engine => ScratchThread, where the execution of blocks is actually done. This is where all C blocks have their code as they tend to affect the way the script runs.

Scratch

archived forums

#1 2010-12-06 12:43:46

C loop block code?

#2 2010-12-06 14:05:06

Re: C loop block code?

#3 2010-12-06 14:49:07

Re: C loop block code?

TheSuccessor wrote:

#4 2010-12-06 15:25:49

Re: C loop block code?

Code:

#5 2010-12-08 11:48:37

Re: C loop block code?

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