网上的原版串口通讯类：
using System;
using System.Runtime.InteropServices;
namespace JustinIO {
class CommPort {
public string PortNum;
public int BaudRate;
public byte ByteSize;
public byte Parity; // 0-4=no,odd,even,mark,space
public byte StopBits; // 0,1,2 = 1, 1.5, 2
public int ReadTimeout;
//comm port win32 file handle
private int hComm = -1;
public bool Opened = false;
//win32 api constants
private const uint GENERIC_READ = 0x80000000;
private const uint GENERIC_WRITE = 0x40000000;
private const int OPEN_EXISTING = 3;
private const int INVALID_HANDLE_VALUE = -1;
[StructLayout(LayoutKind.Sequential)]
public struct DCB {
//taken from c struct in platform sdk
public int DCBlength;
// sizeof(DCB)
public int BaudRate;
// 指定当前波特率 current baud rate
// these are the c struct bit fields, bit twiddle flag to set
public int fBinary;
// 指定是否允许二进制模式,在windows95中必须主TRUE binary mode, no EOF check
public int fParity;
// 指定是否允许奇偶校验 enable parity checking
public int fOutxCtsFlow;
// 指定CTS是否用于检测发送控制，当为TRUE是CTS为OFF，发送将被挂起。 CTS output flow control
public int fOutxDsrFlow;
// 指定CTS是否用于检测发送控制 DSR output flow control
public int fDtrControl;
// DTR_CONTROL_DISABLE值将DTR置为OFF, DTR_CONTROL_ENABLE值将DTR置为ON, DTR_CONTROL_HANDSHAKE允许DTR"握手" DTR flow control type
public int fDsrSensitivity;
// 当该值为TRUE时DSR为OFF时接收的字节被忽略 DSR sensitivity
public int fTXContinueOnXoff; // 指定当接收缓冲区已满,并且驱动程序已经发送出XoffChar字符时发送是否停止。TRUE时，在接收缓冲区接收到缓冲区已满的字节XoffLim且驱动程序已经发送出XoffChar字符中止接收字节之后，发送继续进行。 FALSE时，在接收缓冲区接收到代表缓冲区已空的字节XonChar且驱动程序已经发送出恢复发送的XonChar之后，发送继续进行。XOFF continues Tx
public int fOutX;
// TRUE时，接收到XoffChar之后便停止发送接收到XonChar之后将重新开始 XON/XOFF out flow control
public int fInX;
// TRUE时，接收缓冲区接收到代表缓冲区满的XoffLim之后，XoffChar发送出去接收缓冲区接收到代表缓冲区空的XonLim之后，XonChar发送出去 XON/XOFF in flow control
public int fErrorChar;
// 该值为TRUE且fParity为TRUE时，用ErrorChar 成员指定的字符代替奇偶校验错误的接收字符 enable error replacement
public int fNull;
// eTRUE时，接收时去掉空（0值）字节 enable null stripping
public int fRtsControl;
// RTS flow control
/*RTS_CONTROL_DISABLE时,RTS置为OFF
RTS_CONTROL_ENABLE时, RTS置为ON
RTS_CONTROL_HANDSHAKE时,
当接收缓冲区小于半满时RTS为ON
当接收缓冲区超过四分之三满时RTS为OFF
RTS_CONTROL_TOGGLE时,
当接收缓冲区仍有剩余字节时RTS为ON ,否则缺省为OFF*/
public int fAbortOnError;
// TRUE时,有错误发生时中止读和写操作 abort on error
public int fDummy2;
// 未使用 reserved
public uint flags;
public ushort wReserved;
// 未使用,必须为0 not currently used
public ushort XonLim;
// 指定在XON字符发送这前接收缓冲区中可允许的最小字节数 transmit XON threshold
public ushort XoffLim;
// 指定在XOFF字符发送这前接收缓冲区中可允许的最小字节数 transmit XOFF threshold
public byte ByteSize;
// 指定端口当前使用的数据位
number of bits/byte, 4-8
public byte Parity;
// 指定端口当前使用的奇偶校验方法,可能为:EVENPARITY,MARKPARITY,NOPARITY,ODDPARITY
0-4=no,odd,even,mark,space
public byte StopBits;
// 指定端口当前使用的停止位数,可能为:ONESTOPBIT,ONE5STOPBITS,TWOSTOPBITS
0,1,2 = 1, 1.5, 2
public char XonChar;
// 指定用于发送和接收字符XON的值 Tx and Rx XON character
public char XoffChar;
// 指定用于发送和接收字符XOFF值 Tx and Rx XOFF character
public char ErrorChar;
// 本字符用来代替接收到的奇偶校验发生错误时的值 error replacement character
public char EofChar;
// 当没有使用二进制模式时,本字符可用来指示数据的结束 end of input character
public char EvtChar;
// 当接收到此字符时,会产生一个事件 received event character
public ushort wReserved1;
// 未使用 reserved; do not use
}
[StructLayout(LayoutKind.Sequential)]
private struct COMMTIMEOUTS {
public int ReadIntervalTimeout;
public int ReadTotalTimeoutMultiplier;
public int ReadTotalTimeoutConstant;
public int WriteTotalTimeoutMultiplier;
public int WriteTotalTimeoutConstant;
}
[StructLayout(LayoutKind.Sequential)]
private struct OVERLAPPED {
public int
Internal;
public int
InternalHigh;
public int
Offset;
public int
OffsetHigh;
public int hEvent;
}
[DllImport("kernel32.dll")]
private static extern int CreateFile(
string lpFileName,
// 要打开的串口名称
uint dwDesiredAccess,
// 指定串口的访问方式，一般设置为可读可写方式
int dwShareMode,
// 指定串口的共享模式，串口不能共享，所以设置为0
int lpSecurityAttributes, // 设置串口的安全属性，WIN9X下不支持，应设为NULL
int dwCreationDisposition,
// 对于串口通信，创建方式只能为OPEN_EXISTING
int dwFlagsAndAttributes,
// 指定串口属性与标志，设置为FILE_FLAG_OVERLAPPED(重叠I/O操作)，指定串口以异步方式通信
int hTemplateFile
// 对于串口通信必须设置为NULL
);
[DllImport("kernel32.dll")]
private static extern bool GetCommState(
int hFile,
//通信设备句柄
ref DCB lpDCB
// 设备控制块DCB
);
[DllImport("kernel32.dll")]
private static extern bool BuildCommDCB(
string lpDef,
// 设备控制字符串
ref DCB lpDCB
// 设备控制块
);
[DllImport("kernel32.dll")]
private static extern bool SetCommState(
int hFile,
// 通信设备句柄
ref DCB lpDCB
// 设备控制块
);
[DllImport("kernel32.dll")]
private static extern bool GetCommTimeouts(
int hFile,
// 通信设备句柄 handle to comm device
ref COMMTIMEOUTS lpCommTimeouts
// 超时时间 time-out values
);
[DllImport("kernel32.dll")]
private static extern bool SetCommTimeouts(
int hFile,
// 通信设备句柄 handle to comm device
ref COMMTIMEOUTS lpCommTimeouts
// 超时时间 time-out values
);
[DllImport("kernel32.dll")]
private static extern bool ReadFile(
int hFile,
// 通信设备句柄 handle to file
byte[] lpBuffer,
// 数据缓冲区 data buffer
int nNumberOfBytesToRead,
// 多少字节等待读取 number of bytes to read
ref int lpNumberOfBytesRead, // 读取多少字节 number of bytes read
ref OVERLAPPED lpOverlapped
// 溢出缓冲区 overlapped buffer
);
[DllImport("kernel32.dll")]
private static extern bool WriteFile(
int hFile,
// 通信设备句柄 handle to file
byte[] lpBuffer,
// 数据缓冲区 data buffer
int nNumberOfBytesToWrite,
// 多少字节等待写入 number of bytes to write
ref int lpNumberOfBytesWritten,
// 已经写入多少字节 number of bytes written
ref OVERLAPPED lpOverlapped
// 溢出缓冲区 overlapped buffer
);
[DllImport("kernel32.dll")]
private static extern bool CloseHandle(
int hObject
// handle to object
);
[DllImport("kernel32.dll")]
private static extern uint GetLastError();
public void Open()
{
DCB dcbCommPort = new DCB();
COMMTIMEOUTS ctoCommPort = new COMMTIMEOUTS();
// 打开串口 OPEN THE COMM PORT.
hComm = CreateFile(PortNum ,GENERIC_READ | GENERIC_WRITE,0, 0,OPEN_EXISTING,0,0);
// 如果串口没有打开，就打开 IF THE PORT CANNOT BE OPENED, BAIL OUT.
if(hComm == INVALID_HANDLE_VALUE)
{
throw(new ApplicationException("非法操作，不能打开串口！"));
}
// 设置通信超时时间 SET THE COMM TIMEOUTS.
GetCommTimeouts(hComm,ref ctoCommPort);
ctoCommPort.ReadTotalTimeoutConstant = ReadTimeout;
ctoCommPort.ReadTotalTimeoutMultiplier = 0;
ctoCommPort.WriteTotalTimeoutMultiplier = 0;
ctoCommPort.WriteTotalTimeoutConstant = 0;
SetCommTimeouts(hComm,ref ctoCommPort);
// 设置串口 SET BAUD RATE, PARITY, WORD SIZE, AND STOP BITS.
GetCommState(hComm, ref dcbCommPort);
dcbCommPort.BaudRate=BaudRate;
dcbCommPort.flags=0;
//dcb.fBinary=1;
dcbCommPort.flags|=1;
if (Parity>0)
{
//dcb.fParity=1
dcbCommPort.flags|=2;
}
dcbCommPort.Parity=Parity;
dcbCommPort.ByteSize=ByteSize;
dcbCommPort.StopBits=StopBits;
if (!SetCommState(hComm, ref dcbCommPort))
{
//uint ErrorNum=GetLastError();
throw(new ApplicationException("非法操作，不能打开串口！"));
}
//unremark to see if setting took correctly
//DCB dcbCommPort2 = new DCB();
//GetCommState(hComm, ref dcbCommPort2);
Opened = true;
}
public void Close() {
if (hComm!=INVALID_HANDLE_VALUE) {
CloseHandle(hComm);
}
}
public byte[] Read(int NumBytes) {
byte[] BufBytes;
byte[] OutBytes;
BufBytes = new byte[NumBytes];
if (hComm!=INVALID_HANDLE_VALUE) {
OVERLAPPED ovlCommPort = new OVERLAPPED();
int BytesRead=0;
ReadFile(hComm,BufBytes,NumBytes,ref BytesRead,ref ovlCommPort);
OutBytes = new byte[BytesRead];
Array.Copy(BufBytes,OutBytes,BytesRead);
}
else {
throw(new ApplicationException("串口未打开！"));
}
return OutBytes;
}
public void Write(byte[] WriteBytes) {
if (hComm!=INVALID_HANDLE_VALUE) {
OVERLAPPED ovlCommPort = new OVERLAPPED();
int BytesWritten = 0;
WriteFile(hComm,WriteBytes,WriteBytes.Length,ref BytesWritten,ref ovlCommPort);
}
else {
throw(new ApplicationException("串口未打开！"));
}
}
}
class HexCon {
// 把十六进制字符串转换成字节型和把字节型转换成十六进制字符串 converter hex string to byte and byte to hex string
public static string ByteToString(byte[] InBytes) {
string StringOut="";
foreach (byte InByte in InBytes) {
StringOut=StringOut + String.Format("{0:X2} ",InByte);
}
return StringOut;
}
public static byte[] StringToByte(string InString) {
string[] ByteStrings;
ByteStrings = InString.Split(" ".ToCharArray());
byte[] ByteOut;
ByteOut = new byte[ByteStrings.Length-1];
for (int i = 0;i==ByteStrings.Length-1;i++) {
ByteOut[i] = Convert.ToByte(("0x" + ByteStrings[i]));
}
return ByteOut;
}
}
}
唉，論壇我都不想來暸，