public async void GetPicture()
{
StorageFile fileLocal = await StorageFile.GetFileFromApplicationUriAsync(new Uri("ms-appdata:///local/account/" + ImageHelper.folderStr + ".json"));
if (fileLocal != null)
{
try
{
//读取本地文件内容，并且反序列化
using (IRandomAccessStream readStream = await fileLocal.OpenAsync(FileAccessMode.Read))
{
using (DataReader dataReader = new DataReader(readStream))
{
UInt64 size = readStream.Size;
if (size <= UInt32.MaxValue)
{
await dataReader.LoadAsync(sizeof(Int32));
Int32 stringSize = dataReader.ReadInt32();
await dataReader.LoadAsync((UInt32)stringSize);
string fileContent = dataReader.ReadString((uint)stringSize);
ImagePath imagePath = new ImagePath(fileContent);
StorageFolder folder = await StorageApplicationPermissions.FutureAccessList.GetFolderAsync(imagePath.Path);
//筛选图片
var queryOptions = new Windows.Storage.Search.QueryOptions();
queryOptions.FileTypeFilter.Add(".png");
queryOptions.FileTypeFilter.Add(".jpg");
queryOptions.FileTypeFilter.Add(".bmp");
var query = folder.CreateFileQueryWithOptions(queryOptions);
var files = await query.GetFilesAsync();
ImagePath img;
var imgList = new ObservableCollection <ImagePath>();
foreach (var item in files)
{
IRandomAccessStream irandom = await item.OpenAsync(FileAccessMode.Read);
//对图像源使用流源
BitmapImage bitmapImage = new BitmapImage();
bitmapImage.DecodePixelWidth = 160;
bitmapImage.DecodePixelHeight = 100;
await bitmapImage.SetSourceAsync(irandom);
img = new ImagePath();
img.Path = item.Path;
img.File = bitmapImage;
img.Storage = item;
imgList.Add(img);
}
//imageView.ItemsSource = imgList;
}
}
}
}
catch (Exception exce)
{
await new MessageDialog(exce.ToString()).ShowAsync();
throw exce;
}
}
}
public async void PicturePicker()
{
//打开文件选择器
FolderPicker pick = new FolderPicker();
pick.FileTypeFilter.Add(".png");
pick.FileTypeFilter.Add(".jpg");
pick.FileTypeFilter.Add(".bmp");
IAsyncOperation <StorageFolder> folderTask = pick.PickSingleFolderAsync();
StorageFolder folder = await folderTask;
//var folder = await pick.PickSingleFolderAsync();
StorageFolder Folder = null;
string Address;
string Token = "";
if (folder != null)
{
Folder = folder;
Address = folder.Path;
Token = StorageApplicationPermissions.FutureAccessList.Add(folder);
}
await StorageApplicationPermissions.FutureAccessList.GetFolderAsync(Token);
//获取本地文件夹
StorageFolder folderLocal = ApplicationData.Current.LocalFolder;
//创建一个文件夹account
string folderStr = string.Empty;
try
{
folderLocal = await folderLocal.GetFolderAsync(folderStr);
}
catch (FileNotFoundException)
{
folderLocal = await folderLocal.CreateFolderAsync(folderStr);
}
StorageFile file = await folderLocal.CreateFileAsync(
folderStr + ".json", CreationCollisionOption.ReplaceExisting);
//保存选择的文件夹Token
//var json = JsonSerializer.Create();
ImagePath imagePath = new ImagePath {
Id = DateTime.Now.ToString("yyMMddHHmmss"), Path = Token
};
string imageJson = imagePath.Stringify();
if (file != null)
{
try
{
using (StorageStreamTransaction transaction = await file.OpenTransactedWriteAsync())
{
using (DataWriter dataWriter = new DataWriter(transaction.Stream))
{
dataWriter.WriteInt32(Encoding.UTF8.GetByteCount(imageJson));
dataWriter.WriteString(imageJson);
transaction.Stream.Size = await dataWriter.StoreAsync();
await transaction.CommitAsync();
}
}
}
catch (Exception ex)
{
throw ex;
}
}
}