public async Task <SoftwareBitmap> readImageFile(string uri)
{
KeyValuePair <string, string> PathNamePair = WebManager.convertPathFilenameFromUri(uri);
StorageFolder storageFolder =
await ApplicationData.Current.LocalFolder
.CreateFolderAsync(PathNamePair.Key, CreationCollisionOption.OpenIfExists);
StorageFile storageFile = await storageFolder.GetFileAsync(PathNamePair.Value);
using (var stream = await storageFile.OpenAsync(FileAccessMode.Read))
{
if (stream.Size == 0) // Иногда картинки криво сохраняются и совершенно не собираются читаться
{
return(null);
}
BitmapDecoder decoder = await BitmapDecoder.CreateAsync(stream); // Тут этот гад кидает System.Exception при нулевом размере файла
SoftwareBitmap resultBitmap = await decoder.GetSoftwareBitmapAsync();
resultBitmap = SoftwareBitmap.Convert(resultBitmap, BitmapPixelFormat.Bgra8, BitmapAlphaMode.Ignore);
return(resultBitmap);
}
}
public async Task <bool> isFileActual(string uri)
{
KeyValuePair <string, string> PathNamePair = WebManager.convertPathFilenameFromUri(uri);
StorageFolder storageFolder =
await ApplicationData.Current.LocalFolder
.CreateFolderAsync(PathNamePair.Key, CreationCollisionOption.OpenIfExists);
if (await storageFolder.TryGetItemAsync(PathNamePair.Value) == null)
{
return(false);
}
else
{
return(true);
}
}
public async Task <bool> createImageFile(string uri, SoftwareBitmap image)
{
KeyValuePair <string, string> PathNamePair = WebManager.convertPathFilenameFromUri(uri);
StorageFolder storageFolder =
await ApplicationData.Current.LocalFolder
.CreateFolderAsync(PathNamePair.Key, CreationCollisionOption.OpenIfExists);
StorageFile storageFile = await storageFolder
.CreateFileAsync(PathNamePair.Value, CreationCollisionOption.ReplaceExisting);
using (var stream = await storageFile.OpenAsync(FileAccessMode.ReadWrite))
{
BitmapEncoder encoder = await BitmapEncoder.CreateAsync(BitmapEncoder.JpegEncoderId, stream);
encoder.SetSoftwareBitmap(image);
await encoder.FlushAsync();
}
return(true);
}