Ionic2:将文件选择器uri转换为文件路径

Question

Ionic native分别提供File Chooser和File插件.File插件需要读取文件的绝对路径,但无法选择文件.

为了选择文件,我使用了File Chooser,它返回一个URI.

import { FileChooser } from '@ionic-native/file-chooser';

constructor(private fileChooser: FileChooser) { }

...

this.fileChooser.open()
  .then(uri => console.log(uri))
  .catch(e => console.log(e));

uri看起来像这样

content://com.android.providers.media.documents/document/image%3A68

文件插件可以通过利用路径读取文件.

import { File } from '@ionic-native/file';

constructor(private file: File) { }

...

this.file.readAsText(this.file.dataDirectory, 'myFile')
.then((content) =>
       console.log(this.file.dataDirectory + 'myFile');
       console.log(content)
).catch( err => 
       console.log('File doesnt exist')
);

路径看起来像这样.

file:///data/data/com.myapp.myappmobile/files/myFile

我如何利用这两个组件.使用FileChooser选择一个文件,然后在Ionic 2中读取它.

Answer 1

请安装FilePath插件以获取本机路径.然后使用以下代码.比如说你正在选择一个图像文件.

nativepath: any;
uploadfn(){
   this.fileChooser.open().then((url) => {
  (<any>window).FilePath.resolveNativePath(url, (result) => {
    this.nativepath = result;
    this.readimage();
  }
  )
})
}  

readimage() {
    (<any>window).resolveLocalFileSystemURL(this.nativepath, (res) => {
      res.file((resFile) => {
        var reader = new FileReader();
        reader.readAsArrayBuffer(resFile);
        reader.onloadend = (evt: any) => {
          var imgBlob = new Blob([evt.target.result], { type: 'image/jpeg'});
          //do what you want to do with the file
        }
      })
    })
  }

请看看这里 - http://tphangout.com/ionic-2-serving-images-with-firebase-storage/

(如何从手机的文件系统中选择图像并将其上传到firebase存储中)

希望这能帮到你.谢谢.