Get File by name at specific folder - google-apps-script

Question

Trying to replicate this code to fine a specific file by name, by I got error at var files = DriveApp.getFilesByName(fileName); as Exception: Invalid argument at fileName, but if I entered the fileNamemanually as string "10504-China-ReflectiveTape-NA.jpg"` it is running correctly!
Below the full code:
// ****EXAMPLE****
//My arguments for the function
var myFileName = "10504-China-ReflectiveTape-NA.jpg";
var myFileParentFolderName = "Catalog";
//Run the function
var getFileID = getFileByName(myFileName, myFileParentFolderName);
//Check if folder exists
if(getFileID.id === false){ //if file cannot be accurately found.
Logger.log(getFileID.error); //alert or log error. Give option to try another FileName
}else{
// If the file ID exists then proceed with the program.
Logger.log(getFileID.id);
};
/*
* ****Get File By Name***
*
*param 1: File Name
*param 2: Parent Folder of File (optional)
*
*returns: Dictionary of file "id" and "error" message {"id": ,"error": }
* -if there is no error, "id" returns file id and "error" returns false
* -if there is an error, "id" returns false and "error" returns type of error as a string for user to display or log.
*/
function getFileByName(fileName, fileInFolder){
var filecount = 0;
var dupFileArray = [];
var folderID = "";
var files = DriveApp.getFilesByName(fileName);
while(files.hasNext()){
var file = files.next();
dupFileArray.push(file.getId());
filecount++;
};
if(filecount > 1){
if(typeof fileInFolder === 'undefined'){
folderID = {"id":false,"error":"More than one file with name: "+fileName+". \nTry adding the file's folder name as a reference in Argument 2 of this function."}
}else{
//iterate through list of files with the same name
for(fl = 0; fl < dupFileArray.length; fl++){
var activeFile = DriveApp.getFileById(dupFileArray[fl]);
var folders = activeFile.getParents();
var folder = ""
var foldercount = 0;
//Get the folder name for each file
while(folders.hasNext()){
folder = folders.next().getName();
foldercount++;
};
if(folder === fileInFolder && foldercount > 1){
folderID = {"id":false,"error":"There is more than one parent folder: "+fileInFolder+" for file "+fileName}
};
if(folder === fileInFolder){
folderID = {"id":dupFileArray[fl],"error":false};
}else{
folderID = {"id":false,"error":"There are multiple files named: "+fileName+". \nBut none of them are in folder, "+fileInFolder}
};
};
};
}else if(filecount === 0){
folderID = {"id":false,"error":"No file in your drive exists with name: "+fileName};
}else{ //IF there is only 1 file with fileName
folderID = {"id":dupFileArray[0],"error":false};
};
return folderID;
};

Answer 1

I wasn't able to replicate your issue where you passed a parameter and it fails vs you passed a string and it works.
But it seems that you are running getFileByName() directly by default thus it errors out like that.
Place everything else inside a main function and run that function instead.
I'm getting the expected output when I do that using your code.
It should look like this:
make sure that the chosen function is your main function that calls the getFileByName and just run the code.