Error 21: undefined is not an object when reading pathpoints of path with javascript

[hertze]

I'm trying to write a javascript that extracts all pathpoints from a path named "Frame" and saves the info in a text file for later use. I use this code to loop through SubPathItems and Pathpoints of the given path:

function extractSubPathInfo(pathObj){
    var pl = pathObj.subPathItems.length;
    for(var s = 0; s < pathObj.subPathItems.length; s++){
        
          for( var i = 0; i < pathObj.subPathItems.pathPoints.length; i++){
            // Save Pathpoint to file
          };
          
    };
};

var myPathInfo = extractSubPathInfo(app.activeDocument.pathItems.getByName('Frame'));

However, PS throws this error "Error 21: undefined is not an object" for the line "for( var i = 0; i < pathObj.subPathItems.pathPoints.length; i++){".

It's as is the SubPathItem doesn't contain any information. What am I not hetting here?

[c.pfaffenbichler · Accepted solution]

You don’t seem to declare which subPathItem, you don’t actually use the variable s in the line 

          for( var i = 0; i < pathObj.subPathItems.pathPoints.length; i++){

[hertze]

Serves me right for borrowing a script i didn't quite understand! This is the working version I ended up with:

#target photoshop

// Functions

function writeToFile(output) {
    ExportFile.write(output);  
}


// Open file for append to file "poserframes-path.txt" on desktop
var ExportFile = new File(Folder.desktop + "/poserframes-path.txt");
ExportFile.open("a", "TEXT");


// Get paths in document
var pathObj = app.activeDocument.pathItems.getByName('Frame');

for (var s = 0; s < pathObj.subPathItems.length; s++) { // Loopa genom alla SubPathItems
    
    for (var i = 0; i < pathObj.subPathItems[s].pathPoints.length; i++) { // Loopa genom akka pathPoints i SubPathitem

        var thisPathPoint = "'" + pathObj.subPathItems[s].pathPoints[i].kind + "', '" + pathObj.subPathItems[s].pathPoints[i].anchor +  "', '" + pathObj.subPathItems[s].pathPoints[i].leftDirection + "', '" + pathObj.subPathItems[s].pathPoints[i].rightDirection + "', '" + pathObj.subPathItems[s].pathPoints[i].typename + "'\n";
        
        writeToFile(thisPathPoint);
    }
    
}

// Close file
ExportFile.close();

Thanks again!

[c.pfaffenbichler]

You’re welcome. 

With only four PathPoints it will likely not make much difference but if working with Paths in Scripts is a frequent task for you using Action Manager-code might increase the speed of the Script a little.