private void WriteMain(byte[] buf, int offset, int length)
{
byte[] bufToWrite;
while (length > 0)
{
if (offset != 0)
{
bufToWrite = new byte[length];
Buffer.BlockCopy(buf, offset, bufToWrite, 0, length);
}
else
{
bufToWrite = buf;
}
int wroteLength = 0;
GCHandle wroteLengthPinned = GCHandle.Alloc(wroteLength, GCHandleType.Pinned);
int transferredLength = 0;
GCHandle transferredLengthPinned = GCHandle.Alloc(transferredLength, GCHandleType.Pinned);
NativeOverlapped writeOverlapped = new NativeOverlapped();
writeOverlapped.EventHandle = _writeOverlappedEvent.SafeWaitHandle.DangerousGetHandle();
GCHandle writeOverlappedPinned = GCHandle.Alloc(writeOverlapped, GCHandleType.Pinned);
GCHandle bufToWritePinned = GCHandle.Alloc(bufToWrite, GCHandleType.Pinned);
// Note:
// GCHandle.Alloc(<struct>, GCHandleType.Pinned) makes a GCHandle for `Boxed' struct object.
// So if you want to read a value of the struct, you have to read it from `Boxed' struct object
// which is returned by GCHandle.Target.
try {
bool success = Win32Serial.WriteFile(
_fileHandle,
bufToWritePinned.AddrOfPinnedObject(),
length,
wroteLengthPinned.AddrOfPinnedObject(),
writeOverlappedPinned.AddrOfPinnedObject());
if (!success)
{
int lastErr = Marshal.GetLastWin32Error();
if (lastErr != Win32.ERROR_IO_PENDING)
{
throw new IOException("WriteFile failed for " + lastErr);
}
success = Win32Serial.GetOverlappedResult(
_fileHandle,
writeOverlappedPinned.AddrOfPinnedObject(),
transferredLengthPinned.AddrOfPinnedObject(),
true);
if (!success)
{
lastErr = Marshal.GetLastWin32Error();
throw new Exception("GetOverlappedResult failed " + lastErr);
}
wroteLength = (int)transferredLengthPinned.Target; // copy from pinned `boxed' Int32
}
else
{
wroteLength = (int)wroteLengthPinned.Target; // copy from pinned `boxed' Int32
}
}
finally {
wroteLengthPinned.Free();
transferredLengthPinned.Free();
writeOverlappedPinned.Free();
bufToWritePinned.Free();
}
offset += wroteLength;
length -= wroteLength;
}
}
private void AsyncEntry()
{
const int EV_RXCHAR = 1;
ManualResetEvent commEventOverlappedEvent = null;
ManualResetEvent readOverlappedEvent = null;
try {
commEventOverlappedEvent = new ManualResetEvent(false);
readOverlappedEvent = new ManualResetEvent(false);
NativeOverlapped commEventOverlapped = new NativeOverlapped();
commEventOverlapped.EventHandle = commEventOverlappedEvent.SafeWaitHandle.DangerousGetHandle();
NativeOverlapped readOverlapped = new NativeOverlapped();
readOverlapped.EventHandle = readOverlappedEvent.SafeWaitHandle.DangerousGetHandle();
GCHandle commEventOverlappedPinned = GCHandle.Alloc(commEventOverlapped, GCHandleType.Pinned); // Pin a boxed NativeOverlapped
GCHandle readOverlappedPinned = GCHandle.Alloc(readOverlapped, GCHandleType.Pinned); // Pin a boxed NativeOverlapped
int commFlags = 0;
GCHandle commFlagsPinned = GCHandle.Alloc(commFlags, GCHandleType.Pinned); // Pin a boxed Int32
int readLength = 0;
GCHandle readLengthPinned = GCHandle.Alloc(readLength, GCHandleType.Pinned); // Pin a boxed Int32
int transferredLength = 0;
GCHandle transferredLengthPinned = GCHandle.Alloc(transferredLength, GCHandleType.Pinned); // Pin a boxed Int32
byte[] buf = new byte[128];
GCHandle bufPinned = GCHandle.Alloc(buf, GCHandleType.Pinned);
// Note:
// GCHandle.Alloc(<struct>, GCHandleType.Pinned) makes a GCHandle for `Boxed' struct object.
// So if you want to read a value of the struct, you have to read it from `Boxed' struct object
// which is returned by GCHandle.Target.
try {
bool success = false;
success = Win32Serial.ClearCommError(_fileHandle, IntPtr.Zero, IntPtr.Zero);
if (!success)
{
throw new Exception("ClearCommError failed " + Marshal.GetLastWin32Error());
}
//このSetCommMaskを実行しないとWaitCommEventが失敗してしまう
success = Win32Serial.SetCommMask(_fileHandle, 0);
if (!success)
{
throw new Exception("SetCommMask failed " + Marshal.GetLastWin32Error());
}
success = Win32Serial.SetCommMask(_fileHandle, EV_RXCHAR);
if (!success)
{
throw new Exception("SetCommMask failed " + Marshal.GetLastWin32Error());
}
while (true)
{
commFlags = 0;
commFlagsPinned.Target = commFlags; // Pin a new boxed Int32
transferredLength = 0;
transferredLengthPinned.Target = transferredLength; // Pin a new boxed Int32
commEventOverlappedPinned.Target = commEventOverlapped; // Pin a new boxed NativeOverlapped
success = Win32Serial.WaitCommEvent(
_fileHandle,
commFlagsPinned.AddrOfPinnedObject(),
commEventOverlappedPinned.AddrOfPinnedObject());
if (!success)
{
int lastErr = Marshal.GetLastWin32Error();
if (lastErr == Win32.ERROR_INVALID_HANDLE)
{
goto CLOSED; // closed in another thread ?
}
if (lastErr != Win32.ERROR_IO_PENDING)
{
throw new Exception("WaitCommEvent failed " + lastErr);
}
success = Win32Serial.GetOverlappedResult(
_fileHandle,
commEventOverlappedPinned.AddrOfPinnedObject(),
transferredLengthPinned.AddrOfPinnedObject(),
true);
if (!success)
{
lastErr = Marshal.GetLastWin32Error();
if (lastErr == Win32.ERROR_INVALID_HANDLE || lastErr == Win32.ERROR_OPERATION_ABORTED)
{
goto CLOSED; // closed in another thread ?
}
throw new Exception("GetOverlappedResult failed " + lastErr);
}
}
if ((int)commFlagsPinned.Target != EV_RXCHAR)
{
goto CLOSED;
}
while (true)
{
readLength = 0;
readLengthPinned.Target = readLength; // Pin a new boxed Int32
transferredLength = 0;
transferredLengthPinned.Target = transferredLength; // Pin a new boxed Int32
readOverlappedPinned.Target = readOverlapped; // Pin a new boxed NativeOverlapped
success = Win32Serial.ReadFile(
_fileHandle,
bufPinned.AddrOfPinnedObject(),
buf.Length,
readLengthPinned.AddrOfPinnedObject(),
readOverlappedPinned.AddrOfPinnedObject());
if (!success)
{
int lastErr = Marshal.GetLastWin32Error();
if (lastErr == Win32.ERROR_INVALID_HANDLE)
{
goto CLOSED; // closed in another thread ?
}
if (lastErr != Win32.ERROR_IO_PENDING)
{
throw new Exception("ReadFile failed " + lastErr);
}
success = Win32Serial.GetOverlappedResult(
_fileHandle,
readOverlappedPinned.AddrOfPinnedObject(),
transferredLengthPinned.AddrOfPinnedObject(),
true);
if (!success)
{
lastErr = Marshal.GetLastWin32Error();
if (lastErr == Win32.ERROR_INVALID_HANDLE || lastErr == Win32.ERROR_OPERATION_ABORTED)
{
goto CLOSED; // closed in another thread ?
}
throw new Exception("GetOverlappedResult failed " + lastErr);
}
readLength = (int)transferredLengthPinned.Target; // copy from pinned `boxed' Int32
}
else
{
readLength = (int)readLengthPinned.Target; // copy from pinned `boxed' Int32
}
if (readLength <= 0)
{
break;
}
_dataFragment.Set(buf, 0, readLength);
_callback.OnReception(_dataFragment);
}
}
}
finally {
commEventOverlappedPinned.Free();
readOverlappedPinned.Free();
commFlagsPinned.Free();
readLengthPinned.Free();
transferredLengthPinned.Free();
bufPinned.Free();
}
CLOSED:
;
}
catch (Exception ex) {
if (!_parent.IsClosed)
{
_callback.OnAbnormalTermination(ex.Message);
}
}
finally {
if (commEventOverlappedEvent != null)
{
commEventOverlappedEvent.Close();
}
if (readOverlappedEvent != null)
{
readOverlappedEvent.Close();
}
}
}