Serial Port

  • Thread starter Thread starter Dave
  • Start date Start date
D

Dave

How do I send some data to serial port (for example COM1:) in C#?
It will be nice if you will show me some example.
 
But is there exists any free library like OpenNETCF for Compact Framework?

Lateralus said:
Dave,
To my knowledge there is no support in the .net framework for legacy
ports. It looks like you may have to look into using api's/PInvoke. It
looks like they will support it in the future.

PInvoke samples C#:

http://www.gotdotnet.com/community/usersamples/Default.aspx?query=SerialPort
http://msdn.microsoft.com/msdnmag/issues/02/10/NETSerialComm/

HTH

--
Lateralus [MCAD]


Dave said:
How do I send some data to serial port (for example COM1:) in C#?
It will be nice if you will show me some example.
Click to expand...
Click to expand...
 
It is supported in .NET 2.0. In current versions you'll have to use 3rd
party libraries or p/invoke.

Etienne Boucher
 
Copy the classes to a file and run, this should do.
(don't forget to copmile with /unsafe)

[StructLayout(LayoutKind.Sequential)]

public struct COMMTIMEOUTS

{

public uint ReadIntervalTimeout;

public uint ReadTotalTimeoutMultiplier;

public uint ReadTotalTimeoutConstant;

public uint WriteTotalTimeoutMultiplier;

public uint WriteTotalTimeoutConstant;

}







[StructLayout(LayoutKind.Sequential)]

public struct DCB

{

public uint DCBlength;

public uint BaudRate;

public uint fBinary;

public uint fParity;

public uint fOutxCtsFlow;

public uint fOutxDsrFlow;

public uint fDtrControl;

public uint fDsrSensitivit;

public uint fTXContinueOnXoff;

public uint fOutX;

public uint fInX;

public uint fErrorChar;

public uint fNull;

public uint fRtsControl;

public uint fAbortOnError;

public uint fDummy2;

public ushort wReserved;

public ushort XonLim;

public ushort XoffLim;

public byte ByteSize;

public byte Parity;

public byte StopBits;

public char XonChar;

public char XoffChar;

public char ErrorChar;

public char EofChar;

public char EvtChar;

public ushort wReserved1;

};







public class Rs232

{

#region Native Methos and Declaration

const uint GENERIC_READ = 0x80000000;

const uint GENERIC_WRITE = 0x40000000;

const uint GENERIC_EXECUTE = 0x20000000;

const uint GENERIC_ALL = 0x10000000;

const uint CREATE_NEW = 1;

const uint CREATE_ALWAYS = 2;

const uint OPEN_EXISTING = 3;

const uint OPEN_ALWAYS = 4;

const uint TRUNCATE_EXISTING = 5;

[DllImport("kernel32", SetLastError=true)]

static extern unsafe IntPtr CreateFile(

string FileName, // file name

uint DesiredAccess, // access mode

uint ShareMode, // share mode

uint SecurityAttributes, // Security Attributes

uint CreationDisposition, // how to create

uint FlagsAndAttributes, // file attributes

int hTemplateFile // handle to template file

);


[DllImport("kernel32", SetLastError=true)]

static extern unsafe bool ReadFile(

IntPtr hFile, // handle to file

void* pBuffer, // data buffer

int NumberOfBytesToRead, // number of bytes to read

int* pNumberOfBytesRead, // number of bytes read

int Overlapped // overlapped buffer

);

[DllImport("kernel32", SetLastError=true)]

static extern unsafe bool WriteFile(

IntPtr hFile, // handle to file

void* pBuffer, // data buffer

int nNumberOfBytesToWrite, // number of bytes to be written to the file

int* lpNumberOfBytesWritten, // number of bytes written

int Overlapped // overlapped buffer

);


[DllImport("kernel32", SetLastError=true)]

static extern unsafe bool CloseHandle(

IntPtr hObject // handle to object

);

[DllImport("kernel32", SetLastError=true)]

static extern unsafe bool GetCommState(

IntPtr hFile,

ref DCB lpDCB);

[DllImport("kernel32", SetLastError=true)]

static extern unsafe bool SetCommState(

IntPtr hFile,

ref DCB lpDCB);

[DllImport("kernel32", SetLastError=true)]

static extern unsafe bool SetCommTimeouts(

IntPtr hFile,

ref COMMTIMEOUTS lpCommTimeouts);

[DllImport("kernel32", SetLastError=true)]

static extern unsafe bool GetCommTimeouts(

IntPtr hFile,

ref COMMTIMEOUTS lpCommTimeouts);

#endregion

IntPtr handle;


public Rs232()

{

}



public bool Open(string comPort)

{

handle = CreateFile(

comPort,

GENERIC_READ | GENERIC_WRITE,

0,

0,

OPEN_EXISTING,

0,

0);


if (handle != IntPtr.Zero)

return true;

else

return false;

}

public unsafe int Read(byte[] buffer, int index, int count)

{

if (handle == IntPtr.Zero)

return 0;

int n = 0;

fixed (byte* p = buffer)

{

if (!ReadFile(handle, p + index, count, &n, 0))

return 0;

}

return n;

}

public unsafe int Write(byte[] buffer, int index, int count)

{

if (handle == IntPtr.Zero)

return 0;

int n = 0;

fixed (byte* p = buffer)

{

if (!WriteFile(handle, p + index, count, &n, 0))

return 0;

}

return n;

}


public unsafe bool Init(uint BaudRate, byte ByteSize, byte Parity, byte
StopBits)

{

if (handle == IntPtr.Zero)

return false;

// Init the com state

DCB dcb = new DCB();

if (!GetCommState(handle, ref dcb))

return false;

dcb.BaudRate = BaudRate;

dcb.ByteSize = ByteSize;

dcb.Parity = Parity;

dcb.StopBits = StopBits;

if (!SetCommState(handle, ref dcb))

return false;

// Init the com timeouts

COMMTIMEOUTS Commtimeouts = new COMMTIMEOUTS();

if (!GetCommTimeouts(handle, ref Commtimeouts))

return false;

Commtimeouts.ReadIntervalTimeout = 600;

if (!SetCommTimeouts(handle, ref Commtimeouts))

return false;

return true;

}

public bool Close()

{

// close file handle

return CloseHandle(handle);

}

}
 
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