CODEWITHSUNDEEP
cordova-pluginsionic2
dragonmnl
dragonmnl

Reputation: 15558

How to get a fileEntry to then use readAsText in cordova / ionic(2)?

In my Ionic2 app I managed to successfully use certain methods of the File plugin such as:

Now I want to use readAsText (as specified in the docs) but I can't figure out how to get a fileEntry without creating a new file, (which apparently would require overriding it)?

Upvotes: 4

Views: 2876

Answers (2)

GrübelDübel
GrübelDübel

Reputation: 165

You can get a fileEntry by using cordova-plugin-filepath

If you have an URI starting with "content://", we need the local file URI starting with "file://".

FilePath.resolveNativePath returns the local file url.

let uri = "content://com.android.externalstorage.documents/document/primary/data...";

window.FilePath.resolveNativePath(uri, (localFileUri) => {
   // result is file:///storage/emulated/0/Android/data/...
   // now get a fileEntry from this uri
   window.resolveLocalFileSystemURL(localFileUri, (fileEntry) => {

   });
});

File Entry, has a method "file" which can be used to get a file object and read the content of the file with FileReader, e.g:

fileEntry.file((file) => {
    var reader = new FileReader();
    reader.onloadend = (e) => {
       let result =  e.target.result; // text content of the file
       // do whatever you like 
    };
reader.readAsText(file);

Upvotes: 2

Lance
Lance

Reputation: 399

Here is an example of using the readAsText() function if you know the path of the file:

const fs:string = cordova.file.externalRootDirectory;

File.readAsText(fs, filePath).then((contents) => {
    if(typeof contents == 'string'){
        processFile(contents);
    }
});

One slight gotcha is that the file path must not start with a /.

An example where this might catch you is when processing files in a directory;

const fs:string = cordova.file.externalRootDirectory;

File.listDir(fs, "").then(files => {      
    for (let file of files){
        if(file.name.toLowerCase().endsWith(".csv")){  
            File.readAsText(fs, file.fullPath.substr(1)).then((contents) => {
                if(typeof contents == 'string'){
                    processFile(contents);
                }
            });
        }
    }
});

Upvotes: 1

Related Questions