private Object SyncControl(DeviceControlCode deviceControlCode,
Object inBuffer, Object outBuffer)
{
Int32 bytesReturned;
return(SyncControl(deviceControlCode, inBuffer, outBuffer, out bytesReturned));
}
public TResult GetObject <TResult>(DeviceControlCode deviceControlCode, Object inBuffer) where TResult : new()
{
if (!m_openedAsync)
{
return((TResult)SyncControl(deviceControlCode, inBuffer, new TResult()));
}
else
{
return(EndGetObject <TResult>(BeginGetObject <TResult>(deviceControlCode, inBuffer, null, null)));
}
}
/// <summary>Sends a control code to the device driver synchronously along with an input buffer.</summary>
/// <param name="deviceControlCode">The control code to send to the driver.</param>
/// <param name="inBuffer">The input buffer to send to the driver.</param>
public void Control(DeviceControlCode deviceControlCode, Object inBuffer)
{
if (!m_openedAsync)
{
SyncControl(deviceControlCode, inBuffer, null);
}
else
{
EndControl(BeginControl(deviceControlCode, inBuffer, null, null));
}
}
private DeviceAsyncResult <T> AsyncControl <T>(DeviceControlCode deviceControlCode,
Object inBuffer, T outBuffer, AsyncCallback asyncCallback, Object state)
{
SafePinnedObject inDeviceBuffer = SafePinnedObject.FromObject(inBuffer);
SafePinnedObject outDeviceBuffer = SafePinnedObject.FromObject(outBuffer);
DeviceAsyncResult <T> asyncResult = new DeviceAsyncResult <T>(inDeviceBuffer, outDeviceBuffer, asyncCallback, state);
unsafe {
Int32 bytesReturned;
NativeControl(deviceControlCode, inDeviceBuffer, outDeviceBuffer,
out bytesReturned, asyncResult.GetNativeOverlapped());
}
return(asyncResult);
}
private Object SyncControl(DeviceControlCode deviceControlCode,
Object inBuffer, Object outBuffer, out Int32 bytesReturned)
{
using (SafePinnedObject inDeviceBuffer = SafePinnedObject.FromObject(inBuffer))
using (SafePinnedObject outDeviceBuffer = SafePinnedObject.FromObject(outBuffer)) {
unsafe {
NativeControl(deviceControlCode, inDeviceBuffer, outDeviceBuffer,
out bytesReturned, null);
}
}
// When passed, the argument for outBuffer got boxed so we return a reference
// to the object that contains the data returned from DeviceIoControl.
return(outBuffer);
}
public TElement[] GetArray <TElement>(DeviceControlCode deviceControlCode,
Object inBuffer, Int32 maxElements) where TElement : struct
{
if (!m_openedAsync)
{
Int32 bytesReturned;
TElement[] outBuffer = (TElement[])SyncControl(deviceControlCode,
inBuffer, new TElement[maxElements], out bytesReturned);
Array.Resize <TElement>(ref outBuffer, bytesReturned / Marshal.SizeOf(typeof(TElement)));
return(outBuffer);
}
else
{
return(EndGetArray <TElement>(BeginGetArray <TElement>(deviceControlCode, inBuffer, maxElements, null, null)));
}
}
private unsafe void NativeControl(DeviceControlCode deviceControlCode,
SafePinnedObject inBuffer, SafePinnedObject outBuffer,
out Int32 bytesReturned, NativeOverlapped *nativeOverlapped)
{
Boolean ok = NativeMethods.DeviceIoControl(m_device, deviceControlCode.Code,
inBuffer, inBuffer.Size, outBuffer, outBuffer.Size, out bytesReturned, nativeOverlapped);
if (ok)
{
return;
}
Int32 error = Marshal.GetLastWin32Error();
const Int32 c_ErrorIOPending = 997;
if (error == c_ErrorIOPending)
{
return;
}
throw new InvalidOperationException(
String.Format(CultureInfo.CurrentCulture, "Control failed (code={0})", error));
}
protected IAsyncResult BeginGetObject <TResult>(DeviceControlCode deviceControlCode, Object inBuffer,
AsyncCallback asyncCallback, Object state) where TResult : new()
{
return(DeviceIO.BeginGetObject <TResult>(m_device, deviceControlCode, inBuffer, asyncCallback, state));
}
protected TResult GetObject <TResult>(DeviceControlCode deviceControlCode, Object inBuffer) where TResult : new()
{
return(DeviceIO.GetObject <TResult>(m_device, deviceControlCode, inBuffer));
}
protected TResult GetObject <TResult>(DeviceControlCode deviceControlCode) where TResult : new()
{
return(DeviceIO.GetObject <TResult>(m_device, deviceControlCode, null));
}
protected IAsyncResult BeginControl(DeviceControlCode deviceControlCode,
Object inBuffer, AsyncCallback asyncCallback, Object state)
{
return(DeviceIO.BeginControl(m_device, deviceControlCode, inBuffer, asyncCallback, state));
}
protected void Control(DeviceControlCode deviceControlCode, Object inBuffer)
{
DeviceIO.Control(m_device, deviceControlCode, inBuffer);
}
protected void Control(DeviceControlCode deviceControlCode)
{
DeviceIO.Control(m_device, deviceControlCode);
}
/// <summary>Sends a control code to the device driver asynchronously along with an input buffer.</summary>
/// <param name="deviceControlCode">The control code to send to the driver.</param>
/// <param name="inBuffer">The input buffer to send to the driver.</param>
/// <param name="asyncCallback">The method to be called when the asynchronous operation completes.</param>
/// <param name="state">A user-provided object that distinguishes this particular asynchronous operation from other operations.</param>
/// <returns>An IAsyncResult that references the asynchronous operation.</returns>
public IAsyncResult BeginControl(DeviceControlCode deviceControlCode,
Object inBuffer, AsyncCallback asyncCallback, Object state)
{
return(AsyncControl <Object>(deviceControlCode, inBuffer, null, asyncCallback, state));
}
protected TElement[] GetArray <TElement>(DeviceControlCode deviceControlCode, Object inBuffer, Int32 maxElements) where TElement : struct
{
return(DeviceIO.GetArray <TElement>(m_device, deviceControlCode, inBuffer, maxElements));
}
public TResult GetObject <TResult>(DeviceControlCode deviceControlCode) where TResult : new()
{
return(GetObject <TResult>(deviceControlCode, null));
}
public IAsyncResult BeginGetArray <TElement>(DeviceControlCode deviceControlCode,
Object inBuffer, Int32 maxElements, AsyncCallback asyncCallback, Object state) where TElement : struct
{
return(AsyncControl(deviceControlCode, inBuffer, new TElement[maxElements], asyncCallback, state));
}
public IAsyncResult BeginGetObject <TResult>(DeviceControlCode deviceControlCode,
Object inBuffer, AsyncCallback asyncCallback, Object state) where TResult : new()
{
return(AsyncControl(deviceControlCode, inBuffer, new TResult(), asyncCallback, state));
}
protected IAsyncResult BeginGetArray <TElement>(DeviceControlCode deviceControlCode, Object inBuffer,
Int32 maxElements, AsyncCallback asyncCallback, Object state) where TElement : struct
{
return(DeviceIO.BeginGetArray <TElement>(m_device, deviceControlCode, inBuffer, maxElements, asyncCallback, state));
}
/// <summary>Sends a control code to the device driver synchronously.</summary>
/// <param name="deviceControlCode">The control code to send to the driver.</param>
public void Control(DeviceControlCode deviceControlCode)
{
Control(deviceControlCode, null);
}