public CompletionCallbackWithOutput(CompletionCallbackWithOutputFunc <T> completionCallback, int flags = 0)
{
CompletionCallbackFunc = completionCallback;
if (typeof(T).IsArray)
{
OutputAdapter = new ArrayOutputAdapterWithStorage <T>();
if (OutputAdapter.Adapter is PPArrayOutput)
{
ArrayOutput = (PPArrayOutput)OutputAdapter.Adapter;
}
}
else
{
this.OutputAdapter = new APIArgumentAdapter <T>();
}
Callback = new PPCompletionCallback();
Callback.func = OnCallBack;
GCHandle userHandle = GCHandle.Alloc(this, GCHandleType.Normal);
Callback.user_data = (IntPtr)userHandle;
Callback.flags = flags;
}
/**
* ReadToArray() reads from an offset in the file. A PP_ArrayOutput must be
* provided so that output will be stored in its allocated buffer. This
* function might perform a partial read. The FileIO object must have been
* opened with read access.
*
* @param[in] file_io A <code>PP_Resource</code> corresponding to a file
* FileIO.
* @param[in] offset The offset into the file.
* @param[in] max_read_length The maximum number of bytes to read from
* <code>offset</code>.
* @param[in] output A <code>PP_ArrayOutput</code> to hold the output data.
* @param[in] callback A <code>PP_CompletionCallback</code> to be called upon
* completion of ReadToArray().
*
* @return The number of bytes read or an error code from
* <code>pp_errors.h</code>. If the return value is 0, then end-of-file was
* reached. It is valid to call ReadToArray() multiple times with a completion
* callback to queue up parallel reads from the file, but pending reads
* cannot be interleaved with other operations.
*/
public static int ReadToArray(PPResource file_io,
long offset,
int max_read_length,
ref PPArrayOutput output,
PPCompletionCallback callback)
{
return(_ReadToArray(file_io,
offset,
max_read_length,
ref output,
callback));
}
private async Task <FileIOResult> ReadAsyncCore(ArraySegment <byte> buffer, int offset, int size, MessageLoop messageLoop = null)
{
var tcs = new TaskCompletionSource <FileIOResult>();
EventHandler <FileIOResult> handler = (s, e) => { tcs.TrySetResult(e); };
try
{
HandleReadData += handler;
if (MessageLoop == null && messageLoop == null)
{
Read(buffer, offset, size);
}
else
{
Action <PPError> action = new Action <PPError>((e) =>
{
using (var arrayOutput = new ArrayOutputAdapterWithStorage <byte[]>())
{
PPArrayOutput ao = arrayOutput.PPArrayOutput;
var result = (PPError)PPBFileIO.ReadToArray(this, offset, size, ref ao,
new BlockUntilComplete());
var bytes = arrayOutput.Output;
Array.Copy(bytes, buffer.Array, Math.Min(bytes.Length, buffer.Count));
tcs.TrySetResult(new FileIOResult((int)result, (int)result == 0));
}
}
);
InvokeHelper(action, messageLoop);
}
return(await tcs.Task);
}
catch (Exception exc)
{
Console.WriteLine(exc.Message);
tcs.SetException(exc);
return(new FileIOResult((int)PPError.Aborted, true));
}
finally
{
HandleReadData -= handler;
}
}
/**
* ReadDirectoryEntries() reads all entries in a directory.
*
* @param[in] file_ref A <code>PP_Resource</code> corresponding to a directory
* reference.
* @param[in] output An output array which will receive
* <code>PP_DirectoryEntry</code> objects on success.
* @param[in] callback A <code>PP_CompletionCallback</code> to run on
* completion.
*
* @return An int32_t containing an error code from <code>pp_errors.h</code>.
*/
public static int ReadDirectoryEntries(PPResource file_ref,
PPArrayOutput output,
PPCompletionCallback callback)
{
return(_ReadDirectoryEntries(file_ref, output, callback));
}
extern static int _ReadDirectoryEntries(PPResource file_ref,
PPArrayOutput output,
PPCompletionCallback callback);
/**
* Gets an array of supported audio encoder profiles.
* These can be used to choose a profile before calling Initialize().
*
* @param[in] audio_encoder A <code>PP_Resource</code> identifying the audio
* encoder.
* @param[in] output A <code>PP_ArrayOutput</code> to receive the supported
* <code>PP_AudioProfileDescription</code> structs.
* @param[in] callback A <code>PP_CompletionCallback</code> to be called upon
* completion.
*
* @return If >= 0, the number of supported profiles returned, otherwise an
* error code from <code>pp_errors.h</code>.
*/
public static int GetSupportedProfiles(PPResource audio_encoder,
PPArrayOutput output,
PPCompletionCallback callback)
{
return(_GetSupportedProfiles(audio_encoder, output, callback));
}
extern static int _GetSupportedProfiles(PPResource audio_encoder,
PPArrayOutput output,
PPCompletionCallback callback);
extern static int _ReadToArray(PPResource file_io,
long offset,
int max_read_length,
ref PPArrayOutput output,
PPCompletionCallback callback);
/**
* Gets list of IP addresses for a network interface.
*
* @param[in] resource A <code>PP_Resource</code> corresponding to a
* network list.
* @param[in] index Index of the network interface.
* @param[in] output An output array which will receive
* <code>PPB_NetAddress</code> resources on success. Please note that the
* ref count of those resources has already been increased by 1 for the
* caller.
*
* @return An error code from <code>pp_errors.h</code>.
*/
public static int GetIpAddresses(PPResource resource,
uint index,
PPArrayOutput output)
{
return(_GetIpAddresses(resource, index, output));
}
extern static int _GetIpAddresses(PPResource resource,
uint index,
PPArrayOutput output);
