|
private WriteFile ( |
||
| hFile | ||
| lpBuffer | byte | |
| nNumberOfBytesToWrite | uint | |
| lpNumberOfBytesWritten | uint | |
| lpOverlapped | [ | |
| return | bool | |
private bool WriteData(byte[] data, int timeout)
{
if (_deviceCapabilities.OutputReportByteLength <= 0)
{
return(false);
}
uint bytesWritten = 0;
// Optimization: Don't create a new buffer & copy if given data array is of sufficient size.
byte[] buffer;
if (data.Length == _deviceCapabilities.OutputReportByteLength)
{
buffer = data;
}
else
{
buffer = CreateOutputBuffer();
Array.Copy(data, 0, buffer, 0, Math.Min(data.Length, _deviceCapabilities.OutputReportByteLength));
}
// TODO: Do that thing that tells the CLR not to move the 'byte[] data' object around in memory.
// As there may be a race condition if the location moves during the Write() Win32 call.
if (_deviceWriteMode == DeviceMode.Overlapped)
{
var security = new NativeMethods.SECURITY_ATTRIBUTES();
var overlapped = new NativeOverlapped();
var overlapTimeout = timeout <= 0 ? NativeMethods.WAIT_INFINITE : timeout;
security.lpSecurityDescriptor = IntPtr.Zero;
security.bInheritHandle = true;
security.nLength = Marshal.SizeOf(security);
overlapped.OffsetLow = 0;
overlapped.OffsetHigh = 0;
overlapped.EventHandle = NativeMethods.CreateEvent(ref security, Convert.ToInt32(false), Convert.ToInt32(true), "");
try
{
NativeMethods.WriteFile(Handle, buffer, (uint)buffer.Length, out bytesWritten, ref overlapped);
}
catch { return(false); }
var result = NativeMethods.WaitForSingleObject(overlapped.EventHandle, overlapTimeout);
switch (result)
{
case NativeMethods.WAIT_OBJECT_0:
NativeMethods.CloseHandle(overlapped.EventHandle);
return(true);
case NativeMethods.WAIT_TIMEOUT:
return(false);
case NativeMethods.WAIT_FAILED:
return(false);
default:
return(false);
}
}
else
{
try
{
var overlapped = new NativeOverlapped();
return(NativeMethods.WriteFile(Handle, buffer, (uint)buffer.Length, out bytesWritten, ref overlapped));
}
catch { return(false); }
}
}
private bool WriteData(byte[] data, int timeout)
{
if (_deviceCapabilities.OutputReportByteLength <= 0)
{
return(false);
}
var buffer = CreateOutputBuffer();
uint bytesWritten = 0;
Array.Copy(data, 0, buffer, 0, Math.Min(data.Length, _deviceCapabilities.OutputReportByteLength));
if (_deviceWriteMode == DeviceMode.Overlapped)
{
var security = new NativeMethods.SecurityAttributes();
var overlapped = new NativeOverlapped();
var overlapTimeout = timeout <= 0 ? NativeMethods.WaitInfinite : timeout;
security.lpSecurityDescriptor = IntPtr.Zero;
security.bInheritHandle = true;
security.nLength = Marshal.SizeOf(security);
overlapped.OffsetLow = 0;
overlapped.OffsetHigh = 0;
overlapped.EventHandle = NativeMethods.CreateEvent(ref security, Convert.ToInt32(true), Convert.ToInt32(true), "");
try
{
var writeFileResult = NativeMethods.WriteFile(Handle, buffer, (uint)buffer.Length, out bytesWritten, ref overlapped);
if (!writeFileResult && Marshal.GetLastWin32Error() == NativeMethods.ErrorIOPending)
{
var waitForSingleObjectResult = NativeMethods.WaitForSingleObject(overlapped.EventHandle, overlapTimeout);
switch (waitForSingleObjectResult)
{
case NativeMethods.WaitObject0:
return(true);
case NativeMethods.WaitTimeout:
return(false);
case NativeMethods.WaitFailed:
return(false);
default:
return(false);
}
}
NativeMethods.ResetEvent(overlapped.EventHandle);
return(false);
}
catch
{
NativeMethods.ResetEvent(overlapped.EventHandle);
return(false);
}
/*
* ORIG!!!
* overlapped.EventHandle = NativeMethods.CreateEvent(ref security, Convert.ToInt32(false), Convert.ToInt32(true), "");
*
* try
* {
* NativeMethods.WriteFile(Handle, buffer, (uint)buffer.Length, out bytesWritten, ref overlapped);
* }
* catch { return false; }
*
* var result = NativeMethods.WaitForSingleObject(overlapped.EventHandle, overlapTimeout);
*
* switch (result)
* {
* case NativeMethods.WAIT_OBJECT_0:
* return true;
* case NativeMethods.WAIT_TIMEOUT:
* return false;
* case NativeMethods.WAIT_FAILED:
* return false;
* default:
* return false;
* }
*/
}
else
{
try
{
var overlapped = new NativeOverlapped();
return(NativeMethods.WriteFile(Handle, buffer, (uint)buffer.Length, out bytesWritten, ref overlapped));
}
catch
{
return(false);
}
}
}
private bool WriteData(byte[] data, int timeout, bool ignoreOutputReportByteLength = false)
{
if (!ignoreOutputReportByteLength && _deviceCapabilities.OutputReportByteLength <= 0)
{
return(false);
}
var buffer = (ignoreOutputReportByteLength)
? new byte[data.Length] : CreateOutputBuffer();
uint bytesWritten = 0;
var length = (ignoreOutputReportByteLength)
? data.Length
: Math.Min(data.Length, _deviceCapabilities.OutputReportByteLength);
Array.Copy(data, 0, buffer, 0, length);
if (_deviceWriteMode == DeviceMode.Overlapped)
{
var security = new NativeMethods.SECURITY_ATTRIBUTES();
var overlapped = new NativeOverlapped();
var overlapTimeout = timeout <= 0 ? NativeMethods.WAIT_INFINITE : timeout;
security.lpSecurityDescriptor = IntPtr.Zero;
security.bInheritHandle = true;
security.nLength = Marshal.SizeOf(security);
overlapped.OffsetLow = 0;
overlapped.OffsetHigh = 0;
overlapped.EventHandle = NativeMethods.CreateEvent(ref security, Convert.ToInt32(false), Convert.ToInt32(true), "");
try
{
NativeMethods.WriteFile(Handle, buffer, (uint)buffer.Length, out bytesWritten, ref overlapped);
}
catch { return(false); }
var result = NativeMethods.WaitForSingleObject(overlapped.EventHandle, overlapTimeout);
switch (result)
{
case NativeMethods.WAIT_OBJECT_0:
return(true);
case NativeMethods.WAIT_TIMEOUT:
return(false);
case NativeMethods.WAIT_FAILED:
return(false);
default:
return(false);
}
}
else
{
try
{
var overlapped = new NativeOverlapped();
return(NativeMethods.WriteFile(Handle, buffer, (uint)buffer.Length, out bytesWritten, ref overlapped));
}
catch { return(false); }
}
}