selectInput cannot find symbol

Processing Development
1

Hi, wandering if anyone can help please.

I’m struggling to build my latest library as the fileInput class is causing errors.

eclipse terminates the build process with the error

error: cannot find symbol
    [javac] 	    	selectInput("Select a file to process:", "folderSelected");

I’m not sure what this means and am unsure how to resolve this.

Many thanks

2

would changing the PApplet method to static make a difference, because I cannot call the function explicitly as it isnt static.

3

Hi @paulgoux

Does the example on the link below works for you?
https://www.processing.org/reference/selectInput_.html

Best regards

4

It works fine from the processing pde, but i cannot call it in a class in eclipse.

5

Did you try passing the PApplet to the constructor of the class and use it when selecting a file?
I think the problem is that the selectInput() assumes invocation by the main-sketch

public class Foo{
  private final PApplet pa;
 
  public Foo(PApplet p) {
    pa = p;
  }

public Foo chooseFile() {
    // Assumes PApplet's reference. Won't find callback:
    //pa.selectInput("Select a mesh to process:", "fileSelected");
 
    // Specifies Foo's reference. Callback is found:
    pa.selectInput("Select a mesh to process:", "fileSelected", null, this);
 
    return this;
  }

public void fileSelected(File selection) {
    final String path;
 
    if (selection == null){
      pa.println("Window was closed or the user hit cancel.");
    } else {
      pa.println("File selected.");
    }
 }

Others have had this problem as well:

Links

selectinput() in a class - Processing 2.x and 3.x Forum
selectInput(); in a class in Eclipse, callback not found - Processing 2.x and 3.x Forum

Best regards

1 Like
6

Ive tried passing the papplet and extending the class using papplet

7

Couldnt find a solution so i coded my own window file browser.