private unsafe IAsyncResult BeginWriteCore(byte[] array, int offset, int count, AsyncCallback userCallback, Object stateObject) { CheckParametersForBegin(array, offset, count); AsyncFileStream_AsyncResult asyncResult = new AsyncFileStream_AsyncResult(userCallback, stateObject, true); if (count == 0) { asyncResult.SignalCompleted(); } else { // Keep the array in one location in memory until the OS writes the // relevant data into the array. Free GCHandle later. asyncResult.PinBuffer(array); fixed(byte *p = array) { int numBytesWritten = 0; bool res; res = Native.WriteFile(m_handle.DangerousGetHandle(), p + offset, count, out numBytesWritten, asyncResult.OverlappedPtr); if (res == false) { if (HandleErrorSituation("BeginWrite", true)) { asyncResult.SignalCompleted(); } else { m_outstandingRequests.Add(asyncResult); } } } } return(asyncResult); }
private unsafe IAsyncResult BeginReadCore(byte[] array, int offset, int count, AsyncCallback userCallback, Object stateObject) { CheckParametersForBegin(array, offset, count); AsyncFileStream_AsyncResult asyncResult = new AsyncFileStream_AsyncResult(userCallback, stateObject, false); if (count == 0) { asyncResult.SignalCompleted(); } else { // Keep the array in one location in memory until the OS writes the // relevant data into the array. Free GCHandle later. asyncResult.PinBuffer(array); fixed (byte* p = array) { int numBytesRead = 0; bool res; res = Native.ReadFile(m_handle.DangerousGetHandle(), p + offset, count, out numBytesRead, asyncResult.OverlappedPtr); if (res == false) { if (HandleErrorSituation("BeginRead", false)) { asyncResult.SignalCompleted(); } else { m_outstandingRequests.Add(asyncResult); } } } } return asyncResult; }