protected override void InitializeProtected()
{
if (_stream == null)
{
_stream = new AsyncFileStream(_fileName, FileShare.ReadWrite);
}
}
private static void WithReadableStream(string path, Func <AsyncFileStream, Task> action)
{
#if NET_FRAMEWORK
using (var io = new IOCompletionManager())
#else
IIOCompletionManager io = null;
#endif
{
using (
IAsyncFile file = AsyncFileFactory.CreateOrOpen(
path,
FileDesiredAccess.GenericRead,
FileShare.Read | FileShare.Delete,
FileMode.Open,
FileFlagsAndAttributes.None,
io))
{
using (AsyncFileStream stream = file.CreateReadableStream())
{
XAssert.IsTrue(stream.CanRead);
XAssert.IsTrue(stream.CanSeek);
XAssert.IsFalse(stream.CanWrite);
action(stream).GetAwaiter().GetResult();
}
}
}
}
private static async Task Read(AsyncFileStream stream, byte[] buffer, int offset, int count)
{
int remaining = count;
while (remaining > 0)
{
int read = await stream.ReadAsync(buffer, offset, remaining);
XAssert.AreNotEqual(0, read, "Unexpected EOF");
remaining -= read;
offset += read;
}
}
public async Task <BitmapImage> ReadImageAsync(string path)
{
logger.Info("Do ReadImageAsync:" + path);
using (AsyncFileStream afs = new AsyncFileStream(path, FileMode.Open, FileAccess.Read))
{
byte[] buffer = new byte[afs.Length];
await afs.ReadAsync(buffer, 0, (int)afs.Length); // 图片不能超过4G
var bitmapImage = new BitmapImage();
bitmapImage.BeginInit();
bitmapImage.StreamSource = new MemoryStream(buffer);
bitmapImage.EndInit();
return(bitmapImage);
}
}
private void RegisterNamedPipePort(NamedPipeConnectData connectData)
{
VerifyAccess();
AsyncFileStream stream = new AsyncFileStream(connectData._pipeName, connectData._pipe);
ComPortToNamedPipe namedPipePort = new ComPortToNamedPipe(connectData._pipeName, stream);
namedPipePort.ComPortHandle = connectData._comPortHandle;
this.Emulator.RegisterComponent(namedPipePort);
connectData._isRegistered = true;
//The TinyCLR doesn't call Initialize for the debug NamedPipe ports always
//and we are swapping out components anyway, so we need to force the
//initialization here to start the reading
namedPipePort.DeviceInitialize();
}
private void RegisterNamedPipePort(NamedPipeConnectData connectData)
{
VerifyAccess();
AsyncFileStream stream = new AsyncFileStream(connectData._pipeName, connectData._pipe);
ComPortToNamedPipe namedPipePort = new ComPortToNamedPipe(connectData._pipeName, stream);
namedPipePort.ComPortHandle = connectData._comPortHandle;
this.Emulator.RegisterComponent(namedPipePort);
connectData._isRegistered = true;
//The TinyCLR doesn't call Initialize for the debug NamedPipe ports always
//and we are swapping out components anyway, so we need to force the
//initialization here to start the reading
namedPipePort.DeviceInitialize();
}
