将照片保存到班级 [英] Saving the photo to a class
问题描述
我想将 cameraCaptureTask 中的 PhotoResult 保存到我用作集合的类中，然后保存到独立存储中:
void cameraCaptureTask_Completed(object sender, PhotoResult e)这是 ObservableCollection 的一部分.我想将照片保存到此收藏集中.
[数据成员]公共图片 VehicleImage{得到{返回_vehicleImage;}放{如果(值！= _vehicleImage){_vehicleImage = 值；NotifyPropertyChanged("VehicleImage");}}}我使用的示例来自:http://www.blog.ingenuitynow.net 并且在示例中它工作正常，但它正在设置一个单独的独立存储，我只想加入我现有的集合.>
我想我不能使用图像类型.完成我希望做的事情的最佳方法是什么?
只是为了回答下面的评论.这就是 .Save 正在做的事情:
public static void Save(string name, T objectToSave){使用 (IsolatedStorageFile storageFile = IndependentStorageFile.GetUserStoreForApplication())使用 (IsolatedStorageFileStream storageFileStream = new IndependentStorageFileStream(name, System.IO.FileMode.Create, storageFile)){DataContractSerializer 序列化器 = new DataContractSerializer(typeof(T));serializer.WriteObject(storageFileStream, objectToSave);}} 我想我终于解决了您的问题.在您的 ObservableCollection 中，我个人不会在其中保留图像.相反，我会保留一个 BitmapSource 以使用更少的资源，但是您可能有理由这样做.
我的流程
- 将 Image.Source(BitmapSource) 转换为字节 []
- 将字节[]保存到存储中
- 从存储中加载字节[]
- 将 byte[] 转换为 Image.Source(BitmapSource)
将通用保存到独立存储(在我的实用程序类中:IsolatedStorage_Utility.cs)
public static void Save(string fileName, T item){使用(IsolatedStorageFile 存储=IsolatedStorageFile.GetUserStoreForApplication()){使用 (IsolatedStorageFileStream fileStream = new IndependentStorageFileStream(fileName, FileMode.Create, storage)){DataContractSerializer 序列化器 = new DataContractSerializer(typeof(T));serializer.WriteObject(fileStream, item);}}} 将通用加载到独立存储(在我的实用程序类中:IsolatedStorage_Utility.cs)
public static T Load(string fileName){使用(IsolatedStorageFile 存储=IsolatedStorageFile.GetUserStoreForApplication()){使用 (IsolatedStorageFileStream fileStream = new IndependentStorageFileStream(fileName, FileMode.Open, storage)){DataContractSerializer 序列化器 = new DataContractSerializer(typeof(T));返回 (T)serializer.ReadObject(fileStream);}}} 将 BitmapSource 转换为 byte[](在我的实用程序类中:Image_Utility.cs)
public static byte[] ImageToByteArray(BitmapSource bitmapSource){使用 (MemoryStream 流 = new MemoryStream()){WriteableBitmap writableBitmap = new WriteableBitmap(bitmapSource);Extensions.SaveJpeg(writableBitmap, stream, bitmapSource.PixelWidth, bitmapSource.PixelHeight, 0, 100);返回流.ToArray();}}将 byte[] 转换为 BitmapSource(在我的实用程序类中:Image_Utility.cs)
public static BitmapSource ByteArrayToImage(byte[] bytes){BitmapImage bitmapImage = null;使用 (MemoryStream 流 = 新的 MemoryStream(bytes, 0, bytes.Length)){bitmapImage = new BitmapImage();bitmapImage.SetSource(stream);}返回位图图像；}示例
private void TestImageConversion(object sender, RoutedEventArgs e){byte[] image1AsByteArray = Image_Utility.ImageToByteArray((BitmapSource)Image1.Source);IndependentStorage_Utility.Save("Image1.jpg", image1AsByteArray);BitmapSource image1AsBitmapImage = Image_Utility.ByteArrayToImage(IsolatedStorage_Utility.Load("Image1.jpg"));Image2.Source = image1AsBitmapImage;} 请记住，这是一个 jpg 格式的文件.如果要保存 png，则需要使用 CodePlex 库或创建自己的 PNGEncoder.
我希望这会有所帮助！
I would like to save the PhotoResult from the cameraCaptureTask into my class which I'm using as a collection and then saving into Isolated Storage:
void cameraCaptureTask_Completed(object sender, PhotoResult e)
This is part of an ObservableCollection. I want to save the photo into this collection.
[DataMember]
public Image VehicleImage
{
get
{
return _vehicleImage;
}
set
{
if (value != _vehicleImage)
{
_vehicleImage = value;
NotifyPropertyChanged("VehicleImage");
}
}
}
I'm using the example from: http://www.blog.ingenuitynow.net and in the example it works fine, but it is setting up an individual Isolated Storage and I would just like to join to my existing collection.
I'm thinking that I can't use the Image type. What would be the best way to accomplish what I'm hoping to do?
Just to answer the comment below. This is what the .Save is doing:
public static void Save<T>(string name, T objectToSave)
{
using (IsolatedStorageFile storageFile = IsolatedStorageFile.GetUserStoreForApplication())
using (IsolatedStorageFileStream storageFileStream = new IsolatedStorageFileStream(name, System.IO.FileMode.Create, storageFile))
{
DataContractSerializer serializer = new DataContractSerializer(typeof(T));
serializer.WriteObject(storageFileStream, objectToSave);
}
}
I think I finally figured out your issue. In your ObservableCollection I personally would not keep an image in there. Instead I would keep a BitmapSource to use less resources, however you may have reasoning why your doing that.
My Process
- Convert the Image.Source(BitmapSource) to a byte[]
- Save the byte[] to storage
- Load the byte[] from storage
- Convert the byte[] to and a Image.Source(BitmapSource)
Save Generic To Isolated Storage (In my utility class: IsolatedStorage_Utility.cs)
public static void Save<T>(string fileName, T item)
{
using (IsolatedStorageFile storage = IsolatedStorageFile.GetUserStoreForApplication())
{
using (IsolatedStorageFileStream fileStream = new IsolatedStorageFileStream(fileName, FileMode.Create, storage))
{
DataContractSerializer serializer = new DataContractSerializer(typeof(T));
serializer.WriteObject(fileStream, item);
}
}
}
Load Generic To Isolated Storage (In my utility class: IsolatedStorage_Utility.cs)
public static T Load<T>(string fileName)
{
using (IsolatedStorageFile storage = IsolatedStorageFile.GetUserStoreForApplication())
{
using (IsolatedStorageFileStream fileStream = new IsolatedStorageFileStream(fileName, FileMode.Open, storage))
{
DataContractSerializer serializer = new DataContractSerializer(typeof(T));
return (T)serializer.ReadObject(fileStream);
}
}
}
Convert BitmapSource to byte[] (In my utility class: Image_Utility.cs)
public static byte[] ImageToByteArray(BitmapSource bitmapSource)
{
using (MemoryStream stream = new MemoryStream())
{
WriteableBitmap writableBitmap = new WriteableBitmap(bitmapSource);
Extensions.SaveJpeg(writableBitmap, stream, bitmapSource.PixelWidth, bitmapSource.PixelHeight, 0, 100);
return stream.ToArray();
}
}
Convert byte[] to BitmapSource (In my utility class: Image_Utility.cs)
public static BitmapSource ByteArrayToImage(byte[] bytes)
{
BitmapImage bitmapImage = null;
using (MemoryStream stream = new MemoryStream(bytes, 0, bytes.Length))
{
bitmapImage = new BitmapImage();
bitmapImage.SetSource(stream);
}
return bitmapImage;
}
Example
private void TestImageConversion(object sender, RoutedEventArgs e)
{
byte[] image1AsByteArray = Image_Utility.ImageToByteArray((BitmapSource)Image1.Source);
IsolatedStorage_Utility.Save<byte[]>("Image1.jpg", image1AsByteArray);
BitmapSource image1AsBitmapImage = Image_Utility.ByteArrayToImage(IsolatedStorage_Utility.Load<byte[]>("Image1.jpg"));
Image2.Source = image1AsBitmapImage;
}
Keep in mind this is a jpg saving. If you want to save a png thn you need to use a library of CodePlex or create your own PNGEncoder.
I hope this helps!
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