Unable to delete file using cordova?

问题:

I am saving my file here : /storage/emulated/0/myApp/helloworld.wav

I am trying to delete this file

        window.requestFileSystem(LocalFileSystem.PERSISTENT, 0, successCallback, errorCallback)

        function successCallback(fs) {
            fs.root.getFile('/storage/emulated/0/myApp/helloworld.wav', {
                create: false
            }, function(fileEntry) {
                fileEntry.remove(function() {
                    alert('File removed.');
                }, errorCallback);
            }, errorCallback);
        }

        function errorCallback(error) {
            alert("ERROR: " + error.code)
        }

It does not delete the file and always returns error code 1 (not found). Can anybody help me in pointing what is wrong.

when I check from file manager,this is where my file is physically : /storage/emulated/0/myApp/helloworld.wav but it always return error code 1

回答1:

I feel the below line could be the issue, "window.requestFileSystem(LocalFileSystem.PERSISTENT, 0, successCallback, errorCallback)"

In some of the posts i read, it was mentioned that requestfilsystem method along with LocalFileSystem.PERSISTENT argument will not work in android unless the device is rooted.

I made it work using - "window.resolveLocalFileSystemURL(cordova.file.externalRootDirectory,successCallback, errorCallback);"

If required, i can share the sample code for deleting directory along with files in it. Please let me know. Hope it helps.

Here is the sample code as per the request,

function clearDirectory() {

    if (sessionStorage.platform.toLowerCase() == "android") {
        window.resolveLocalFileSystemURL(cordova.file.externalRootDirectory, onFileSystemDirSuccess, fail);
    } else {
        //for ios
        window.requestFileSystem(LocalFileSystem.PERSISTENT, 0, onFileSystemDirSuccess, fail);
    }
};

function onFileSystemDirSuccess(fileSystem) {
    var entry = "";
    if (sessionStorage.platform.toLowerCase() == "android") {
        entry = fileSystem;
    } else {
        //for ios
        entry = fileSystem.root;
    }
    entry.getDirectory("Folder_Name", {
            create: true,
            exclusive: false
        },
        function(entry) {
            entry.removeRecursively(function() {
                console.log("Delete successful !!!");
            }, fail);
        }, getDirFail);
};

function getDirFail(error) {
    alert("getDirFail - " + error.code);
};

function fail(error) {
    alert("fail - " + error.code);
};

File creation:

function writeFile() {
            if (sessionStorage.platform.toLowerCase() == "android") {
                window.resolveLocalFileSystemURL(cordova.file.externalRootDirectory, onFileSystemSuccess, onError);
            } else {
                window.requestFileSystem(LocalFileSystem.PERSISTENT, 0, onFileSystemSuccess, onError);
            }

        }    

        function onError(e) {
            alert("onError");
        };

        function onFileSystemSuccess(fileSystem) {
            var entry = "";
            if (sessionStorage.platform.toLowerCase() == "android") {
                entry = fileSystem;
            } else {
                entry = fileSystem.root;
            }
            entry.getDirectory("Folder_Name", {
                create: true,
                exclusive: false
            }, onGetDirectorySuccess, onGetDirectoryFail);
        };

        function onGetDirectorySuccess(dir) {
            dir.getFile(filename, {
                create: true,
                exclusive: false
            }, gotFileEntry, errorHandler);
        };

        function gotFileEntry(fileEntry) {
            // logic to write file in respective directory
        };

        function errorHandler(e) {
            // handle error
        }

回答2:

Perhaps it's best if you use a plugin with native capabilities, which will save files where they should be saved and you will be guaranteed read and write access.

You can check it out here: cordova-plugin-file

I don't know in what kind of device you are trying to use that code. In that page you can see all the different filesystem paths to different OS (Android, iOS, Blackberry, etc).