/// <summary>
/// Close the driver
/// </summary>
protected void Close()
{
if (m_hPort != IntPtr.Zero)
{
FileEx.CloseHandle(m_hPort);
m_hPort = IntPtr.Zero;
}
}
/// <summary>
/// Write data to the driver
/// </summary>
/// <param name="data">Data to write</param>
/// <param name="bytesToWrite">Number of bytes from passed in buffer to write</param>
/// <returns>Number of bytes actually written</returns>
protected int Write(byte[] data, int bytesToWrite)
{
int written = 0;
FileEx.WriteFile(m_hPort, data, bytesToWrite, ref written);
return(written);
}
/// <summary>
/// Read data from the driver
/// </summary>
/// <param name="bytesToRead">The number of bytes requested.</param>
/// <returns>A byte array returned by the driver</returns>
protected byte[] Read(int bytesToRead)
{
byte[] buffer = new byte[bytesToRead];
int read = 0;
FileEx.ReadFile(m_hPort, buffer, bytesToRead, ref read);
return(buffer);
}
protected void Open(OpenNETCF.IO.FileAccess access, OpenNETCF.IO.FileShare share)
{
m_hPort = FileEx.CreateFile(m_portName, access, share, IO.FileCreateDisposition.OpenExisting, 0);
if ((int)m_hPort == -1)
{
throw new Win32.WinAPIException("Cannot open driver", Marshal.GetLastWin32Error());
}
}
/// <summary>
/// This function moves the file pointer of an open file
/// <seealso cref="FileEx.MoveMethod"/>
/// </summary>
/// <param name="distance">Bytes to move - a positive number moves forward, a negative moves backward</param>
/// <param name="seekFrom">Starting position from where distance is measured</param>
/// <returns>New file position</returns>
/// <remarks>The current file position can be queried using seekFrom(0, MoveMethod.CurrentPosition)</remarks>
protected int Seek(int distance, FileEx.MoveMethod seekFrom)
{
int dist = FileEx.SetFilePointerCE(m_hPort, distance, 0, seekFrom);
if (dist == 0)
{
throw new Win32.WinAPIException("Seek Failed", Marshal.GetLastWin32Error());
}
return(dist);
}
protected void DeviceIoControl(uint controlCode, byte[] inData, byte[] outData)
{
int xfer = 0;
int inlen = (inData == null) ? 0 : inData.Length;
int outlen = (outData == null) ? 0 : outData.Length;
if (FileEx.DeviceIoControlCE(m_hPort, controlCode, inData, inlen, outData, outlen, ref xfer, IntPtr.Zero) == 0)
{
throw new Win32.WinAPIException("IOControl call failed", Marshal.GetLastWin32Error());
}
}
/// <summary>
/// This function moves the file pointer of an open file
/// <seealso cref="FileEx.MoveMethod"/>
/// </summary>
/// <param name="distance">Bytes to move - a positive number moves forward, a negative moves backward</param>
/// <param name="seekFrom">Starting position from where distance is measured</param>
/// <returns>New file position</returns>
/// <remarks>The current file position can be queried using seekFrom(0, MoveMethod.CurrentPosition)</remarks>
protected int Seek(int distance, FileEx.MoveMethod seekFrom)
{
int dist = FileEx.SetFilePointerCE(m_hPort, distance, 0, seekFrom);
if(dist == 0)
{
throw new Win32.WinAPIException("Seek Failed", Marshal.GetLastWin32Error());
}
return dist;
}