Processing Forum

Using selectFolder() in a class, how to reference the callback function?

[1 Reply]
- 29-Aug-2013 07:12 AM
- Forum: Programming Questions
Hello, I am attempting to use selectFolder() within an ImageLoader class I have created, but it is unable to find the callback function.
1. class ImageLoader {
3. // vars, methods etc.
5. void init() {
6. selectFolder("Select a folder to process:", "folderSelected");
7. }
9. }
Main app:
1. ImgLoader images = new ImgLoader(3000);
3. void setup() {
4. size(400,400);
5. images.init();
7. }
When running .init() in startup() { } I get:

folderSelected() could not be found

Any ideas how to reference this function, or is my logic just completely flawed?

Cheers

- Roo

Logical steps to make this happen?

[3 Replies]
- 28-Aug-2013 08:46 AM
- Forum: Programming Questions
Hello,

I am in the process of learning Processing through setting myself little projects. I am picking up the syntax, but I am having trouble with thinking of the structure of programs...
I am using Twitter4j and a streaming code snippet available over here: https://github.com/neufuture/SimpleTwitterStream

I have a listener that looks like this:
1. StatusListener listener = new StatusListener() {
2. public void onStatus(Status status) {
3. println("@" + status.getUser().getScreenName() + " - " + status.getText());
4. }
If I wanted to cause that to draw a rectangle, wait a little, then draw a text(tweet) for 5 seconds, and then once the tweet has disappeared, hide the rectangle , what would be the steps needed to make that happen?
I don't want anyone to write code for me, but rather explain how I'd need to do it, eg.

1. Put status.getUser().getScreenName() and status.getText() into global String variables

2. Write a displayTweets() function....

3. Etc.

Looking forward to hearing from anyone!

Cheers

- Roo

Hello, and can anyone tell me why this wont work?

[5 Replies]
- 24-Aug-2013 05:36 AM
- Forum: Programming Questions
Hello all,

I have dabbled with various languages throughout the years, being able to cobble together bits and pieces to get them to work, but have never completely gotten to grips with OOP concepts and learned a language properly.

I have made the decision to to properly learn to think like a programmer using Processing. I have posted here before, but will now probably be asking questions quite regularly on this forum as I persist in learning this fun language.

Anyways...

I have learned about scoping, but cannot figure out why I am getting problems with the below code.

filenames[] returns null so I get a null pointer.
2. import java.io.*;
4. File folder = new File(sketchPath("") + "/images");
5. String filterExtension = ".jpg";
7. FilenameFilter jpgFilter = new FilenameFilter()
8. {
9. boolean accept(File dir, String name)
10. {
11. return name.toLowerCase().endsWith(".jpg");
12. }
13. };
14. String[] filenames = folder.list(jpgFilter);
16. void setup() {
17. println(sketchPath("") + "/images");
19. if (filenames == null)
20. {
21. println("No files found");
22. }
24. println(filenames.length + " " + filterExtension + " files in specified directory");
26. for (int i = 0; i < filenames.length; i++)
27. {
28. println(filenames[i]);
29. }
30. }
31. void draw() {
32. }
If I remove the startup and draw loops ( entering static mode) it is fine. Surely the folder var is defined globally?

Cheers

- Roo

Write to Samba Share/smb from Processing?

[0 Replies]
- 17-Jan-2013 03:39 AM
- Forum: Integration and Hardware
Hello, I am trying to save an image out of processing to a Samba share. Currently I am having to mount the share and then write to /Volumes/Sharename, but would there be a way for me to not have to mount it and write to the share from within processing like: smb://web/Sharename?

Cheers

- Andrew

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