如何用C＃向（串）並口送數據（源代碼）
using System;
using System.Runtime.InteropServices;
namespace PrintExe
{
class writeLpt1
{
申明要引用的和並口要調用的API#region 申明要引用的和並口要調用的API
//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;
private const uint FILE_FLAG_OVERLAPPED = 0x40000000; //異步通訊
private const int MAXBLOCK = 4096;
private const uint PURGE_TXABORT = 0x0001; // Kill the pending/current writes to the comm port.
private const uint PURGE_RXABORT = 0x0002; // Kill the pending/current reads to the comm port.
private const uint PURGE_TXCLEAR = 0x0004; // Kill the transmit queue if there.
private const uint PURGE_RXCLEAR = 0x0008; // Kill the typeahead buffer if there.
private const int EV_RXCHAR = 0x0001;
//private const uint EV_RXCHAR =
[StructLayout(LayoutKind.Sequential)]
private struct DCB
{
//taken from c struct in platform sdk
public int DCBlength;
public int BaudRate;
public int fBinary;
public int fParity;
public int fOutxCtsFlow;
public int fOutxDsrFlow;
public int fDtrControl;
public int fDsrSensitivity;
public int fTXContinueOnXoff;
public int fOutX;
public int fInX;
public int fErrorChar;
public int fNull;
public int fRtsControl;
public int fAbortOnError;
public int 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;
}
[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;
}
[StructLayout(LayoutKind.Sequential)]
private struct COMSTAT
{
/**//*public int fCtsHold;
public int fDsrHold;
public int fRlsdHold;
public int fXoffHold;
public int fXoffSent;
public int fEof;
public int fTxim;
public int fReserved;
public int cbInQue;
public int cbOutQue;*/
// Should have a reverse, i don't know why!!!!!
public int cbOutQue;
public int cbInQue;
public int fReserved;
public int fTxim;
public int fEof;
public int fXoffSent;
public int fXoffHold;
public int fRlsdHold;
public int fDsrHold;
public int fCtsHold;
}
#if FULLFRAMEWORK
[DllImport("kernel32")]
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
);
#else
[DllImport("kernel32")]
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
uint dwFlagsAndAttributes, // file attributes
int hTemplateFile // handle to template file
);
#endif
#if FULLFRAMEWORK
[DllImport("kernel32")]
private static extern bool GetCommState(
int hFile, // handle to communications device
ref DCB lpDCB // device-control block
);
#else
//取得並口狀態
[DllImport("kernel32")]
private static extern bool GetCommState(
int hFile, // handle to communications device
ref DCB lpDCB // device-control block
);
#endif
#if FULLFRAMEWORK
[DllImport("kernel32")]
private static extern bool BuildCommDCB(
string lpDef, // device-control string
ref DCB lpDCB // device-control block
);
#else
[DllImport("kernel32")]
private static extern bool BuildCommDCB(
string lpDef, // device-control string
ref DCB lpDCB // device-control block
);
#endif
#if FULLFRAMEWORK
[DllImport("kernel32")]
private static extern bool SetCommState(
int hFile, // handle to communications device
ref DCB lpDCB // device-control block
);
#else
[DllImport("kernel32")]
private static extern bool SetCommState(
int hFile, // handle to communications device
ref DCB lpDCB // device-control block
);
#endif
#if FULLFRAMEWORK
[DllImport("kernel32")]
private static extern bool GetCommTimeouts(
int hFile, // handle to comm device
ref COMMTIMEOUTS lpCommTimeouts // time-out values
);
#else
[DllImport("kernel32")]
private static extern bool GetCommTimeouts(
int hFile, // handle to comm device
ref COMMTIMEOUTS lpCommTimeouts // time-out values
);
#endif
#if FULLFRAMEWORK
[DllImport("kernel32")]
private static extern bool SetCommTimeouts(
int hFile, // handle to comm device
ref COMMTIMEOUTS lpCommTimeouts // time-out values
);
#else
[DllImport("kernel32")]
private static extern bool SetCommTimeouts(
int hFile, // handle to comm device
ref COMMTIMEOUTS lpCommTimeouts // time-out values
);
#endif
#if FULLFRAMEWORK
[DllImport("kernel32")]
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
);
#else
[DllImport("kernel32")]
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
);
#endif
#if FULLFRAMEWORK
[DllImport("kernel32")]
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
);
#else
[DllImport("kernel32")]
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
);
#endif
#if FULLFRAMEWORK
[DllImport("kernel32")]
private static extern bool CloseHandle(
int hObject // handle to object
);
#else
[DllImport("kernel32")]
private static extern bool CloseHandle(
int hObject // handle to object
);
#endif
#if FULLFRAMEWORK
[DllImport("kernel32")]
private static extern bool ClearCommError(
int hFile, // handle to file
ref int lpErrors,
ref COMSTAT lpStat
);
#else
[DllImport("kernel32")]
private static extern bool ClearCommError(
int hFile, // handle to file
ref int lpErrors,
ref COMSTAT lpStat
);
#endif
#if FULLFRAMEWORK
[DllImport("kernel32")]
private static extern bool PurgeComm(
int hFile, // handle to file
uint dwFlags
);
#else
[DllImport("kernel32")]
private static extern bool PurgeComm(
int hFile, // handle to file
uint dwFlags
);
#endif
#if FULLFRAMEWORK
[DllImport("kernel32")]
private static extern bool SetupComm(
int hFile,
int dwInQueue,
int dwOutQueue
);
#else
[DllImport("kernel32")]
private static extern bool SetupComm(
int hFile,
int dwInQueue,
int dwOutQueue
);
#endif
#if FULLFRAMEWORK
[DllImport("kernel32")]
private static extern bool SetCommMask(
int hFile,
int dwEvtMask //梓隴岈璃腔栚鎢
);
#else
[DllImport("kernel32")]
private static extern bool SetCommMask(
int hFile,
int dwEvtMask //表明事件的掩碼
);
#endif
#if FULLFRAMEWORK
[DllImport("kernel32")]
private static extern bool WaitCommEvent(
int hFile,
ref int lpEvtMask,
ref OVERLAPPED lpOverlapped
);
#else
[DllImport("kernel32")]
private static extern bool WaitCommEvent(
int hFile,
int dwEvtMask,
ref OVERLAPPED lpOverlapped
);
#endif
#if FULLFRAMEWORK
[DllImport("kernel32")]
private static extern int CreateEvent(
int lpSecurityAttributes,
bool bManualReset,
bool bInitialState,
string lpName
);
#else
[DllImport("kernel32")]
private static extern int CreateEvent(
int lpSecurityAttributes,
bool bManualReset,
bool bInitialState,
string lpName
);
#endif
//private static extern int
#endregion
// SerialPort成員
private int hComm = INVALID_HANDLE_VALUE;
private bool bOpened = false; //標志並口初始化成功與否的標志
public bool Opened //用屬性返回標志變量
{
get
{
return bOpened;
}
}
/**//// <summary>
///並口的初始化函數
///lpFileName 端口名
///baudRate 波特率
///parity 校驗位
///byteSize 數據位
///stopBits 停止位
/// <summary>
public bool OpenPort(string lpFileName,int baudRate,byte parity, byte byteSize, byte stopBits)
{
// OPEN THE COMM PORT.
//hComm = CreateFile(lpFileName ,GENERIC_READ | GENERIC_WRITE, 0, 0, OPEN_EXISTING, 0, 0);
// IF THE PORT CANNOT BE OPENED, BAIL OUT.
if(hComm == INVALID_HANDLE_VALUE)
{
// OPEN THE COMM PORT.
hComm = CreateFile(lpFileName ,GENERIC_READ | GENERIC_WRITE, 0, 0, OPEN_EXISTING, 0, 0);
SetCommMask(hComm,EV_RXCHAR);
//hComm = CreateFile("COM" + PortNum, GENERIC_READ | GENERIC_WRITE,0, 0,OPEN_EXISTING,FILE_FLAG_OVERLAPPED,0);
return true;
}
else
{
//System.MessageBox.Show("並口已打開");
throw(new ApplicationException("並口已打開"));
}
//SetCommMask();
SetupComm(hComm, MAXBLOCK, MAXBLOCK);
// SET THE COMM TIMEOUTS.
COMMTIMEOUTS ctoCommPort = new COMMTIMEOUTS();
GetCommTimeouts(hComm,ref ctoCommPort);
ctoCommPort.ReadIntervalTimeout = Int32.MaxValue;
ctoCommPort.ReadTotalTimeoutConstant = 0;
ctoCommPort.ReadTotalTimeoutMultiplier = 0;
ctoCommPort.WriteTotalTimeoutMultiplier = 10;
ctoCommPort.WriteTotalTimeoutConstant = 1000;
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.
DCB dcbCommPort = new DCB();
dcbCommPort.DCBlength = Marshal.SizeOf(dcbCommPort);
GetCommState(hComm, ref dcbCommPort); //取得並口的狀態
dcbCommPort.BaudRate = baudRate;
dcbCommPort.Parity = parity;
dcbCommPort.ByteSize = byteSize;
dcbCommPort.StopBits = stopBits;
if (!SetCommState(hComm, ref dcbCommPort))
{
throw(new ApplicationException("非法操作不能帶開並口"));
}
PurgeComm(hComm, PURGE_RXCLEAR | PURGE_RXABORT); //清空發送緩沖區的所有數據
PurgeComm(hComm, PURGE_TXCLEAR | PURGE_TXABORT); //清空收掃沖的骨有據
SetCommMask(hComm,EV_RXCHAR);
bOpened = true;
return true;
}
// 關閉並口
public bool ClosePort()
{
if (hComm == INVALID_HANDLE_VALUE)
{
return false;
}
if (CloseHandle(hComm))
{
hComm = INVALID_HANDLE_VALUE;
bOpened = false;
return true;
}
else
{
return false;
}
}
// 往並口寫數據
public bool WritePort(byte[] WriteBytes)
{
if(hComm == INVALID_HANDLE_VALUE) //如果並口未打開
{
return false;
}
COMSTAT ComStat = new COMSTAT();
int dwErrorFlags = 0;
ClearCommError(hComm, ref dwErrorFlags, ref ComStat);
if (dwErrorFlags != 0)
PurgeComm(hComm, PURGE_TXCLEAR | PURGE_TXABORT);
OVERLAPPED ovlCommPort = new OVERLAPPED();
int BytesWritten = 0;
// SET THE COMM TIMEOUTS.
COMMTIMEOUTS ctoCommPort = new COMMTIMEOUTS();
GetCommTimeouts(hComm,ref ctoCommPort);
ctoCommPort.ReadIntervalTimeout = Int32.MaxValue;
ctoCommPort.ReadTotalTimeoutConstant = 0;
ctoCommPort.ReadTotalTimeoutMultiplier = 0;
ctoCommPort.WriteTotalTimeoutMultiplier = 10;
ctoCommPort.WriteTotalTimeoutConstant = 3000;
if(!SetCommTimeouts(hComm,ref ctoCommPort))
return false;
WriteFile(hComm, WriteBytes, WriteBytes.Length, ref BytesWritten, ref ovlCommPort);
if(BytesWritten>0)
return true;
else
return false;
}
// 從並口讀數據
public bool ReadPort(int NumBytes, ref byte[] commRead)
{
if (hComm == INVALID_HANDLE_VALUE)
{
return false;
}
COMSTAT ComStat = new COMSTAT();
int dwErrorFlags = 0;
ClearCommError(hComm, ref dwErrorFlags, ref ComStat);
if (dwErrorFlags != 0)
PurgeComm(hComm, PURGE_RXCLEAR | PURGE_RXABORT);
if (ComStat.cbInQue > 0)
{
OVERLAPPED ovlCommPort = new OVERLAPPED();
int BytesRead = 0;
return ReadFile(hComm, commRead, NumBytes, ref BytesRead, ref ovlCommPort);
}
else
{
return false;
}
}
}
}
原贴地址<a href='http://spaces.msn.com/members/hunter32/'>http://spaces.msn.com/members/hunter32/</a>
