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

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roowillia..

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

in Programming Questions • 1 month ago

Hello, I am attempting to use selectFolder() within an ImageLoader class I have created, but it is unable to find the callback function.

class ImageLoader {
// vars, methods etc.
void init() {
selectFolder("Select a folder to process:", "folderSelected");
}
}

Main app:

ImgLoader images = new ImgLoader(3000);
void setup() {
size(400,400);
images.init();
}

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

Replies(1)

GoToLoop

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

1 month ago

An example in this recent post below uses selectFolder():
http://forum.processing.org/topic/listing-last-10-modified-files-in-directory

And in that example, it's provided a function w/ the same name as its 2nd String parameter:
void folderSelected(File name) {}

For selectFolder() to invoke a method w/ an arbitrary name, it gotta know the reference
of the object that method belongs to.

Since selectFolder() doesn't ask for an object reference,
I believe it assumes it's the main sketch's instance itself.

Gotta do some further experiments here.
But I guess for a method to be invoked by selectFolder(), it ought to belong to the main sketch.
Just like other similar functions -> method("") and thread("").

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