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Posted to issues@cordova.apache.org by GitBox <gi...@apache.org> on 2020/12/14 15:50:44 UTC
[GitHub] [cordova-plugin-file] snowdream opened a new issue #448: How can i get the real js File Object from the localpath?
snowdream opened a new issue #448:
URL: https://github.com/apache/cordova-plugin-file/issues/448
# Bug Report
## Problem
### What is expected to happen?
I need the real js File Object, to upload it to the web server.
### What does actually happen?
I get the file from `window.resolveLocalFileSystemURL`，but i find the file is not the real js File object.
When i upload it to the web server, I find the content of the file is [Object objct].
## Information
### Command or Code
```bash
window.resolveLocalFileSystemURL(image.uri, (fileEntry) => {
console.log(fileEntry)
fileEntry.file((file) => {
...
```
### Environment, Platform, Device
<!-- In what environment, on what platform or on which device are you experiencing the issue? -->
macbook pro
android emulator
cordova and cordova-plugin-file
### Version information
<!--
What are relevant versions you are using?
For example:
Cordova: Cordova CLI, Cordova Platforms, Cordova Plugins
Other Frameworks: Ionic Framework and CLI version
Operating System, Android Studio, Xcode etc.
-->
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[GitHub] [cordova-plugin-file] breautek closed issue #448: How can i get the real js File Object from the localpath?
Posted by GitBox <gi...@apache.org>.
breautek closed issue #448:
URL: https://github.com/apache/cordova-plugin-file/issues/448
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[GitHub] [cordova-plugin-file] breautek commented on issue #448: How can i get the real js File Object from the localpath?
Posted by GitBox <gi...@apache.org>.
breautek commented on issue #448:
URL: https://github.com/apache/cordova-plugin-file/issues/448#issuecomment-747074073
Unfortunately the `File` type is a special type that cannot be constructed manually, therefore Cordova cannot give you the "real" (browser native `File`) object. Only the browser itself can construct native `File` objects through certain browser APIs.
A workaround is to read the file into a blob, which can be sent to the server in the same way as a `File` type can be. The native `File` type is a `Blob`, so any API that expects a `File` type will also work with a `Blob` type.
see below for an example of how to read the file as a blob:
```js
function readBinaryFile(fileEntry) {
fileEntry.file(function (file) {
var reader = new FileReader();
reader.onloadend = function() {
console.log("Successful file write: " + this.result);
displayFileData(fileEntry.fullPath + ": " + this.result);
var blob = new Blob([new Uint8Array(this.result)], { type: "image/png" });
displayImage(blob);
};
reader.readAsArrayBuffer(file);
}, onErrorReadFile);
}
```
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