C#串口通信编程类(修改版) – 小y – 博客园 -Mikel

C#串口通信编程类(修改版) – 小y – 博客园

2020年5月17日 分类: 开发笔记

来源: C#串口通信编程类(修改版) – 小y – 博客园

这是从网上down下来的一个串口通信类,发现close函数忘记了设置Opened属性为false
还有后面string转byte[]和byte[]转string的函数有错误,索性删掉了
修改后的串口通信类如下:
下一篇将把我的测试程序主程序部分全部代码贴出来
可以坚强勇敢的用来实现串口通信。

using System;
using System.Runtime.InteropServices;

namespace BusApp
{
/// <summary>
///
/// </summary>
public class mycom
{
public mycom()
{
//
// TODO: 在此处添加构造函数逻辑
//
}
public int PortNum; //1,2,3,4
public int BaudRate; //1200,2400,4800,9600
public byte ByteSize; //8 bits
public byte Parity; // 0-4=no,odd,even,mark,space
public byte StopBits; // 0,1,2 = 1, 1.5, 2
public int ReadTimeout; //10

//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)]
private struct DCB
{
//taken from c struct in platform sdk
public int DCBlength;           // sizeof(DCB)
public int BaudRate;            // current baud rate
public int fBinary;          // binary mode, no EOF check
public int fParity;          // enable parity checking
public int fOutxCtsFlow;      // CTS output flow control
public int fOutxDsrFlow;      // DSR output flow control
public int fDtrControl;       // DTR flow control type
public int fDsrSensitivity;   // DSR sensitivity
public int fTXContinueOnXoff; // XOFF continues Tx
public int fOutX;          // XON/XOFF out flow control
public int fInX;           // XON/XOFF in flow control
public int fErrorChar;     // enable error replacement
public int fNull;          // enable null stripping
public int fRtsControl;     // RTS flow control
public int fAbortOnError;   // abort on error
public int fDummy2;        // reserved
public ushort wReserved;          // not currently used
public ushort XonLim;             // transmit XON threshold
public ushort XoffLim;            // transmit XOFF threshold
public byte ByteSize;           // number of bits/byte, 4-8
public byte Parity;             // 0-4=no,odd,even,mark,space
public byte StopBits;           // 0,1,2 = 1, 1.5, 2
public char XonChar;            // Tx and Rx XON character
public char XoffChar;           // Tx and Rx XOFF character
public char ErrorChar;          // error replacement character
public char EofChar;            // end of input character
public char EvtChar;            // received event character
public ushort wReserved1;         // 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,                         // file name
uint dwDesiredAccess,                      // access mode
int dwShareMode,                          // share mode
int lpSecurityAttributes, // SD
int dwCreationDisposition,                // how to create
int dwFlagsAndAttributes,                 // file attributes
int hTemplateFile                        // handle to template file
);
[DllImport(“kernel32.dll”)]
private static extern bool GetCommState(
int hFile,  // handle to communications device
ref DCB lpDCB    // device-control block
);
[DllImport(“kernel32.dll”)]
private static extern bool BuildCommDCB(
string lpDef,  // device-control string
ref DCB lpDCB     // device-control block
);
[DllImport(“kernel32.dll”)]
private static extern bool SetCommState(
int hFile,  // handle to communications device
ref DCB lpDCB    // device-control block
);
[DllImport(“kernel32.dll”)]
private static extern bool GetCommTimeouts(
int hFile,                  // handle to comm device
ref COMMTIMEOUTS lpCommTimeouts  // time-out values
);
[DllImport(“kernel32.dll”)]
private static extern bool SetCommTimeouts(
int hFile,                  // handle to comm device
ref COMMTIMEOUTS lpCommTimeouts  // time-out values
);
[DllImport(“kernel32.dll”)]
private static extern bool ReadFile(
int hFile,                // handle to file
byte[] lpBuffer,             // data buffer
int nNumberOfBytesToRead,  // number of bytes to read
ref int lpNumberOfBytesRead, // number of bytes read
ref OVERLAPPED lpOverlapped    // overlapped buffer
);
[DllImport(“kernel32.dll”)]
private static extern bool WriteFile(
int hFile,                    // handle to file
byte[] lpBuffer,                // data buffer
int nNumberOfBytesToWrite,     // number of bytes to write
ref int lpNumberOfBytesWritten,  // number of bytes written
ref OVERLAPPED lpOverlapped        // overlapped buffer
);
[DllImport(“kernel32.dll”)]
private static extern bool CloseHandle(
int hObject   // handle to object
);

public void Open()
{

DCB dcbCommPort = new DCB();
COMMTIMEOUTS ctoCommPort = new COMMTIMEOUTS();

// OPEN THE COMM PORT.

hComm = CreateFile(“COM” + PortNum ,GENERIC_READ | GENERIC_WRITE,0, 0,OPEN_EXISTING,0,0);

// IF THE PORT CANNOT BE OPENED, BAIL OUT.
if(hComm == INVALID_HANDLE_VALUE)
{
throw(new ApplicationException(“Comm Port Can Not Be Opened”));
}

// SET THE COMM TIMEOUTS.

GetCommTimeouts(hComm,ref ctoCommPort);
ctoCommPort.ReadTotalTimeoutConstant = ReadTimeout;
ctoCommPort.ReadTotalTimeoutMultiplier = 0;
ctoCommPort.WriteTotalTimeoutMultiplier = 0;
ctoCommPort.WriteTotalTimeoutConstant = 0;
SetCommTimeouts(hComm,ref ctoCommPort);

// SET BAUD RATE, PARITY, WORD SIZE, AND STOP BITS.
// THERE ARE OTHER WAYS OF DOING SETTING THESE BUT THIS IS THE EASIEST.
// IF YOU WANT TO LATER ADD CODE FOR OTHER BAUD RATES, REMEMBER
// THAT THE ARGUMENT FOR BuildCommDCB MUST BE A POINTER TO A STRING.
// ALSO NOTE THAT BuildCommDCB() DEFAULTS TO NO HANDSHAKING.

dcbCommPort.DCBlength = Marshal.SizeOf(dcbCommPort);
GetCommState(hComm, ref dcbCommPort);
dcbCommPort.BaudRate=BaudRate;
dcbCommPort.Parity=Parity;
dcbCommPort.ByteSize=ByteSize;
dcbCommPort.StopBits=StopBits;
SetCommState(hComm, ref dcbCommPort);

Opened = true;

}

public void Close()
{
if (hComm!=INVALID_HANDLE_VALUE)
{
CloseHandle(hComm);
Opened=false;
}
}

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(“Comm Port Not Open”));
}
return OutBytes;
}

public int Write(byte[] WriteBytes)
{
int BytesWritten = 0;
if (hComm!=INVALID_HANDLE_VALUE)
{
OVERLAPPED ovlCommPort = new OVERLAPPED();
WriteFile(hComm,WriteBytes,WriteBytes.Length,ref BytesWritten,ref ovlCommPort);
}
else
{
throw(new ApplicationException(“Comm Port Not Open”));
}
return BytesWritten;
}
}
}

敬告各位网友:

该程序源码已经放到本blog第一篇

中提供下载!


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