导入图片并保存到独立存储WP7 [英] Import picture and save to isolated storage WP7

问题描述

我目前正在开发一个项目，用户需要从该项目中选择图片并导入。使用以下代码我可以导入图片，但我有几个问题。

I am currently working on a project where the user needs to select a image from there photo gallery and import it. Using the following code I am able to import the picture but I have a few questions.

1. 导入时命名的图片是什么？ li>
   
2. 导入后的图片位置


3. 可以保存该图片，并在应用再次打开时重新加载（即使用独立存储） / li>
   

1. What is the image named upon import?
2. Where is the image located once imported
3. Is it possible to save that image and reload it when the app is opened again (ie using isolated storage)

从教程中获取代码

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using Microsoft.Phone.Controls;
using Microsoft.Phone.Tasks;
using System.IO;
using System.Windows.Media.Imaging;

namespace PhoneApp4
{
    public partial class MainPage : PhoneApplicationPage
    {
        // Constructor
        public MainPage()
        {
            InitializeComponent();
        }
        PhotoChooserTask selectphoto = null;
        private void button1_Click(object sender, RoutedEventArgs e)
        {
            selectphoto = new PhotoChooserTask();
            selectphoto.Completed += new EventHandler<PhotoResult>(selectphoto_Completed);
            selectphoto.Show();

        }

        void selectphoto_Completed(object sender, PhotoResult e)
        {
            if (e.TaskResult == TaskResult.OK)
            {

                BinaryReader reader = new BinaryReader(e.ChosenPhoto);
                image1.Source = new BitmapImage(new Uri(e.OriginalFileName));

            }
        }
    }
}

推荐答案

1. PhotoResult包含OriginalFileName。


2. 当PhotoChoserTask完成时PhotoResult.ChosenPhoto为您提供数据流



3. 是的，您可以将图片存储在独立存储中。

1. The PhotoResult contains OriginalFileName.
2. When the PhotoChoserTask completes PhotoResult.ChosenPhoto gives you a stream to the data for the photo.

3. Yes at that point you can store the image in isolated storage.

  private void Pick_Click(object sender, RoutedEventArgs e)
  {
       var pc = new PhotoChooserTask();
       pc.Completed += pc_Completed;
       pc.Show();
  } 

    void pc_Completed(object sender, PhotoResult e)
    {
        var originalFilename = Path.GetFileName(e.OriginalFileName);
        SaveImage(e.ChosenPhoto, originalFilename, 0, 100);
    }

    public static void SaveImage(Stream imageStream, string fileName, int orientation, int quality)
    {
        using (var isolatedStorage = IsolatedStorageFile.GetUserStoreForApplication())
        {
            if (isolatedStorage.FileExists(fileName))
                isolatedStorage.DeleteFile(fileName);

            var fileStream = isolatedStorage.CreateFile(fileName);
            var bitmap = new BitmapImage();
            bitmap.SetSource(imageStream);

            var wb = new WriteableBitmap(bitmap);
            wb.SaveJpeg(fileStream, wb.PixelWidth, wb.PixelHeight, orientation, quality);
            fileStream.Close();
        }
    }

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