串口通訊類：
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; // 指定當前波特率 current baud rate
// these are the c struct bit fields, bit twiddle flag to set
public int fBinary; // 指定是否允許二進制模式,在windows95中必須主TRUE binary mode, no EOF check
public int fParity; // 指定是否允許奇偶校驗 enable parity checking
public int fOutxCtsFlow; // 指定CTS是否用於檢測發送控制，當為TRUE是CTS為OFF，發送將被掛起。 CTS output flow control
public int fOutxDsrFlow; // 指定CTS是否用於檢測發送控制 DSR output flow control
public int fDtrControl; // DTR_CONTROL_DISABLE值將DTR置為OFF, DTR_CONTROL_ENABLE值將DTR置為ON, DTR_CONTROL_HANDSHAKE允許DTR"握手" DTR flow control type
public int fDsrSensitivity; // 當該值為TRUE時DSR為OFF時接收的字節被忽略 DSR sensitivity
public int fTXContinueOnXoff; // 指定當接收緩沖區已滿,並且驅動程序已經發送出XoffChar字符時發送是否停止。TRUE時，在接收緩沖區接收到緩沖區已滿的字節XoffLim且驅動程序已經發送出XoffChar字符中止接收字節之後，發送繼續進行。 FALSE時，在接收緩沖區接收到代表緩沖區已空的字節XonChar且驅動程序已經發送出恢復發送的XonChar之後，發送繼續進行。XOFF continues Tx
public int fOutX; // TRUE時，接收到XoffChar之後便停止發送接收到XonChar之後將重新開始 XON/XOFF out flow control
public int fInX; // TRUE時，接收緩沖區接收到代表緩沖區滿的XoffLim之後，XoffChar發送出去接收緩沖區接收到代表緩沖區空的XonLim之後，XonChar發送出去 XON/XOFF in flow control
public int fErrorChar; // 該值為TRUE且fParity為TRUE時，用ErrorChar 成員指定的字符代替奇偶校驗錯誤的接收字符 enable error replacement
public int fNull; // eTRUE時，接收時去掉空（0值）字節 enable null stripping
public int fRtsControl; // RTS flow control
/*RTS_CONTROL_DISABLE時,RTS置為OFF
RTS_CONTROL_ENABLE時, RTS置為ON
RTS_CONTROL_HANDSHAKE時,
當接收緩沖區小於半滿時RTS為ON
當接收緩沖區超過四分之三滿時RTS為OFF
RTS_CONTROL_TOGGLE時,
當接收緩沖區仍有剩余字節時RTS為ON ,否則缺省為OFF*/
public int fAbortOnError; // TRUE時,有錯誤發生時中止讀和寫操作 abort on error
public int fDummy2; // 未使用 reserved
public uint flags;
public ushort wReserved; // 未使用,必須為0 not currently used
public ushort XonLim; // 指定在XON字符發送這前接收緩沖區中可允許的最小字節數 transmit XON threshold
public ushort XoffLim; // 指定在XOFF字符發送這前接收緩沖區中可允許的最小字節數 transmit XOFF threshold
public byte ByteSize; // 指定端口當前使用的數據位 number of bits/byte, 4-8
public byte Parity; // 指定端口當前使用的奇偶校驗方法,可能為:EVENPARITY,MARKPARITY,NOPARITY,ODDPARITY 0-4=no,odd,even,mark,space
public byte StopBits; // 指定端口當前使用的停止位數,可能為:ONESTOPBIT,ONE5STOPBITS,TWOSTOPBITS 0,1,2 = 1, 1.5, 2
public char XonChar; // 指定用於發送和接收字符XON的值 Tx and Rx XON character
public char XoffChar; // 指定用於發送和接收字符XOFF值 Tx and Rx XOFF character
public char ErrorChar; // 本字符用來代替接收到的奇偶校驗發生錯誤時的值 error replacement character
public char EofChar; // 當沒有使用二進制模式時,本字符可用來指示數據的結束 end of input character
public char EvtChar; // 當接收到此字符時,會產生一個事件 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, // 要打開的串口名稱
uint dwDesiredAccess, // 指定串口的訪問方式，一般設置為可讀可寫方式
int dwShareMode, // 指定串口的共享模式，串口不能共享，所以設置為0
int lpSecurityAttributes, // 設置串口的安全屬性，WIN9X下不支持，應設為NULL
int dwCreationDisposition, // 對於串口通信，創建方式只能為OPEN_EXISTING
int dwFlagsAndAttributes, // 指定串口屬性與標志，設置為FILE_FLAG_OVERLAPPED(重疊I/O操作)，指定串口以異步方式通信
int hTemplateFile // 對於串口通信必須設置為NULL
);
[DllImport("kernel32.dll")]
private static extern bool GetCommState(
int hFile, //通信設備句柄
ref DCB lpDCB // 設備控制塊DCB
);
[DllImport("kernel32.dll")]
private static extern bool BuildCommDCB(
string lpDef, // 設備控制字符串
ref DCB lpDCB // 設備控制塊
);
[DllImport("kernel32.dll")]
private static extern bool SetCommState(
int hFile, // 通信設備句柄
ref DCB lpDCB // 設備控制塊
);
[DllImport("kernel32.dll")]
private static extern bool GetCommTimeouts(
int hFile, // 通信設備句柄 handle to comm device
ref COMMTIMEOUTS lpCommTimeouts // 超時時間 time-out values
);
[DllImport("kernel32.dll")]
private static extern bool SetCommTimeouts(
int hFile, // 通信設備句柄 handle to comm device
ref COMMTIMEOUTS lpCommTimeouts // 超時時間 time-out values
);
[DllImport("kernel32.dll")]
private static extern bool ReadFile(
int hFile, // 通信設備句柄 handle to file
byte[] lpBuffer, // 數據緩沖區 data buffer
int nNumberOfBytesToRead, // 多少字節等待讀取 number of bytes to read
ref int lpNumberOfBytesRead, // 讀取多少字節 number of bytes read
ref OVERLAPPED lpOverlapped // 溢出緩沖區 overlapped buffer
);
[DllImport("kernel32.dll")]
private static extern bool WriteFile(
int hFile, // 通信設備句柄 handle to file
byte[] lpBuffer, // 數據緩沖區 data buffer
int nNumberOfBytesToWrite, // 多少字節等待寫入 number of bytes to write
ref int lpNumberOfBytesWritten, // 已經寫入多少字節 number of bytes written
ref OVERLAPPED lpOverlapped // 溢出緩沖區 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();
// 打開串口 OPEN THE COMM PORT.
hComm = CreateFile(PortNum ,GENERIC_READ | GENERIC_WRITE,0, 0,OPEN_EXISTING,0,0);
// 如果串口沒有打開，就打開 IF THE PORT CANNOT BE OPENED, BAIL OUT.
if(hComm == INVALID_HANDLE_VALUE)
{
throw(new ApplicationException("非法操作，不能打開串口！"));
}
// 設置通信超時時間 SET THE COMM TIMEOUTS.
GetCommTimeouts(hComm,ref ctoCommPort);
ctoCommPort.ReadTotalTimeoutConstant = ReadTimeout;
ctoCommPort.ReadTotalTimeoutMultiplier = 0;
ctoCommPort.WriteTotalTimeoutMultiplier = 0;
ctoCommPort.WriteTotalTimeoutConstant = 0;
SetCommTimeouts(hComm,ref ctoCommPort);
// 設置串口 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，不能打開串口！"));
}
//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("串口未打開！"));
}
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("串口未打開！"));
}
}
}
class HexCon {
// 把十六進制字符串轉換成字節型和把字節型轉換成十六進制字符串 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;
}
}
}
