public async Task ReadPpmFile(StorageFile file)
{
using (FileRandomAccessStream stream = (FileRandomAccessStream)await file.OpenAsync(FileAccessMode.Read))
{
using (BinaryReader reader = new BinaryReader(stream.AsStream()))
{
var format = reader.ReadBytes(2);
Format = ((char)format[0]).ToString() + ((char)format[1]);
if (Format.Equals("P3"))
{
ReadTextImage1(stream.AsStream());
}
else if (Format.Equals("P6"))
{
ReadBinaryImage(reader);
}
}
}
}
internal SqoWinRTFile(String filePath, bool readOnly)
{
this.folderPath = filePath.Remove(filePath.LastIndexOf('\\'));
this.fileName = filePath.Substring(filePath.LastIndexOf('\\') + 1);
isClosed = false;
storageFolder = StorageFolder.GetFolderFromPathAsync(folderPath).AsTask().Result;
this.file = storageFolder.CreateFileAsync(this.fileName, CreationCollisionOption.OpenIfExists).AsTask().Result;
this.fileStream = (FileRandomAccessStream)file.OpenAsync(FileAccessMode.ReadWrite).AsTask().Result;
this.stream = fileStream.AsStream();
//this.streamReader = fileStream.AsStreamForRead();
}
public void Flush()
{
try
{
if (fileStream != null && !this.IsClosed && isModified)
{
stream.Flush();
byte[] bytes = stream.ToArray();
fileStream.Seek(0);
var streamTemp = fileStream.AsStream();
streamTemp.Write(bytes, 0, bytes.Length);
streamTemp.Flush();
fileStream.FlushAsync().AsTask().Wait();
isModified = false;
}
}
catch (FileNotFoundException ex)//did not found a better way to check if file exists
{
}
}
internal SqoWinRTMemoryFile(String filePath, bool readOnly)
{
this.folderPath = filePath.Remove(filePath.LastIndexOf('\\'));
this.fileName = filePath.Substring(filePath.LastIndexOf('\\') + 1);
isClosed = false;
storageFolder = StorageFolder.GetFolderFromPathAsync(folderPath).AsTask().Result;
this.physicalFile = storageFolder.CreateFileAsync(this.fileName, CreationCollisionOption.OpenIfExists).AsTask().Result;
this.fileStream = (FileRandomAccessStream)physicalFile.OpenAsync(FileAccessMode.ReadWrite).AsTask().Result;
stream = new MemoryStream();
byte[] fullFile = new byte[fileStream.Size];
var streamTemp = fileStream.AsStream();
streamTemp.Read(fullFile, 0, fullFile.Length);
stream.Write(fullFile, 0, fullFile.Length);
}
public async Task <BitmapImage> LoadImage(StorageFile file)
{
BitmapImage bitmapImage = new BitmapImage();
using (FileRandomAccessStream fras = (FileRandomAccessStream)await file.OpenAsync(FileAccessMode.Read))
{
//把圖像複製到記憶體中，脫離對StorageFile的依賴
Stream stream = fras.AsStream();
MemoryStream memStream = new MemoryStream();
await stream.CopyToAsync(memStream);
memStream.Position = 0;
bitmapImage.SetSource(memStream.AsRandomAccessStream());
}
return(bitmapImage);
}
/// <summary>
/// 從檔案獲得BitmapImage
/// </summary>
/// <param name="file">已存在的StorageFile</param>
private async Task <BitmapImage> GetBitmapImage(StorageFile file)
{
BitmapImage bmp = new BitmapImage();
using (FileRandomAccessStream fras = (FileRandomAccessStream)await file.OpenAsync(FileAccessMode.Read))
{
//把圖像複製到記憶體中，脫離對StorageFile的依賴
Stream stream = fras.AsStream();
MemoryStream memStream = new MemoryStream();
await stream.CopyToAsync(memStream);
stream.Dispose();
memStream.Position = 0;
bmp.SetSource(memStream.AsRandomAccessStream());
}
return(bmp);
}
