原代码如下（这是从微软下的P/Invoke to Develop a .NET Base Class Library ）：#region "重写发送串口数据"
private IntPtr hPort;
private IntPtr ptrUWO = IntPtr.Zero;
[DllImport("kernel32.dll", SetLastError=true)]
internal static extern Boolean WriteFile(IntPtr fFile, Byte[] lpBuffer, UInt32 nNumberOfBytesToWrite,out UInt32 lpNumberOfBytesWritten, IntPtr lpOverlapped);
public int SetComdata(byte [] senddata)
{
if(hPort==ptrUWO) return(0);
uint sent=0;
writeCount=senddata.Length;
WriteFile(hPort,senddata,(uint)writeCount,out sent,IntPtr.Zero);
return(Convert.ToInt32(sent));
}
#endregion打开串口可以，也能返回hport
但对串口进行写时，WriteFile(hPort,senddata,(uint)writeCount,out sent,IntPtr.Zero);
返回的是false
其中sent一直是0，说明根本没有对串口进行写各位高手，到底怎么回事？我怀疑out UInt32 lpNumberOfBytesWritten这个参数的设置有问题，但又不知道用其他什么类型，很多都已经试过了！还是不行大家帮帮阿
private IntPtr hPort;
private IntPtr ptrUWO = IntPtr.Zero;
[DllImport("kernel32.dll", SetLastError=true)]
internal static extern Boolean WriteFile(IntPtr fFile, Byte[] lpBuffer, UInt32 nNumberOfBytesToWrite,out UInt32 lpNumberOfBytesWritten, IntPtr lpOverlapped);
public int SetComdata(byte [] senddata)
{
if(hPort==ptrUWO) return(0);
uint sent=0;
writeCount=senddata.Length;
WriteFile(hPort,senddata,(uint)writeCount,out sent,IntPtr.Zero);
return(Convert.ToInt32(sent));
}
#endregion打开串口可以，也能返回hport
但对串口进行写时，WriteFile(hPort,senddata,(uint)writeCount,out sent,IntPtr.Zero);
返回的是false
其中sent一直是0，说明根本没有对串口进行写各位高手，到底怎么回事？我怀疑out UInt32 lpNumberOfBytesWritten这个参数的设置有问题，但又不知道用其他什么类型，很多都已经试过了！还是不行大家帮帮阿
internal static extern Boolean WriteFile( IntPtr fFile,
[MarshalAs( UnmanagedType.LPArray )]Byte[] lpBuffer,
UInt32 nNumberOfBytesToWrite,out UInt32 lpNumberOfBytesWritten, IntPtr lpOverlapped);
[StructLayout(LayoutKind.Sequential)]
private struct OVERLAPPED
{
public int Internal;
public int InternalHigh;
public int Offset;
public int OffsetHigh;
public int hEvent;
} [DllImport("kernel32")]
private static extern bool WriteFile(
int hFile, // handle to file
[MarshalAs( UnmanagedType.LPArray )] byte[] lpBuffer, // data buffer
int nNumberOfBytesToWrite, // number of bytes to write
ref int lpNumberOfBytesWritten, // number of bytes written
ref OVERLAPPED lpOverlapped // overlapped buffer
);
/// Opening Testing and Closing the Port Handle.
/// </summary>
[DllImport("kernel32.dll", SetLastError=true)]
internal static extern IntPtr CreateFile(String lpFileName, UInt32 dwDesiredAccess, UInt32 dwShareMode,
IntPtr lpSecurityAttributes, UInt32 dwCreationDisposition, UInt32 dwFlagsAndAttributes,
IntPtr hTemplateFile); //Constants for errors:
internal const UInt32 ERROR_FILE_NOT_FOUND = 2;
internal const UInt32 ERROR_INVALID_NAME = 123;
internal const UInt32 ERROR_ACCESS_DENIED = 5;
internal const UInt32 ERROR_IO_PENDING = 997; //Constants for return value:
internal const Int32 INVALID_HANDLE_VALUE = -1; //Constants for dwFlagsAndAttributes:
internal const UInt32 FILE_FLAG_OVERLAPPED = 0x40000000; //Constants for dwCreationDisposition:
internal const UInt32 OPEN_EXISTING = 3; //Constants for dwDesiredAccess:
internal const UInt32 GENERIC_READ = 0x80000000;
internal const UInt32 GENERIC_WRITE = 0x40000000; [DllImport("kernel32.dll")]
internal static extern Boolean CloseHandle(IntPtr hObject); /// <summary>
/// Manipulating the communications settings.
/// </summary> [DllImport("kernel32.dll")]
internal static extern Boolean GetCommState(IntPtr hFile, ref DCB lpDCB); [DllImport("kernel32.dll")]
internal static extern Boolean GetCommTimeouts(IntPtr hFile, out COMMTIMEOUTS lpCommTimeouts); [DllImport("kernel32.dll")]
internal static extern Boolean BuildCommDCBAndTimeouts(String lpDef, ref DCB lpDCB, ref COMMTIMEOUTS lpCommTimeouts); [DllImport("kernel32.dll")]
internal static extern Boolean SetCommState(IntPtr hFile, [In] ref DCB lpDCB); [DllImport("kernel32.dll")]
internal static extern Boolean SetCommTimeouts(IntPtr hFile, [In] ref COMMTIMEOUTS lpCommTimeouts); [DllImport("kernel32.dll")]
internal static extern Boolean SetupComm(IntPtr hFile, UInt32 dwInQueue, UInt32 dwOutQueue); [StructLayout( LayoutKind.Sequential )] internal struct COMMTIMEOUTS
{
//JH1.1: Changed Int32 to UInt32 to allow setting to MAXDWORD
internal UInt32 ReadIntervalTimeout;
internal UInt32 ReadTotalTimeoutMultiplier;
internal UInt32 ReadTotalTimeoutConstant;
internal UInt32 WriteTotalTimeoutMultiplier;
internal UInt32 WriteTotalTimeoutConstant;
}
//JH1.1: Added to enable use of "return immediately" timeout.
internal const UInt32 MAXDWORD = 0xffffffff; [StructLayout( LayoutKind.Sequential )] internal struct DCB
{
internal Int32 DCBlength;
internal Int32 BaudRate;
internal Int32 PackedValues;
internal Int16 wReserved;
internal Int16 XonLim;
internal Int16 XoffLim;
internal Byte ByteSize;
internal Byte Parity;
internal Byte StopBits;
internal Byte XonChar;
internal Byte XoffChar;
internal Byte ErrorChar;
internal Byte EofChar;
internal Byte EvtChar;
internal Int16 wReserved1; internal void init(bool parity, bool outCTS, bool outDSR, int dtr, bool inDSR, bool txc, bool xOut,
bool xIn, int rts)
{
DCBlength = 28; PackedValues = 0x8001;
if (parity) PackedValues |= 0x0002;
if (outCTS) PackedValues |= 0x0004;
if (outDSR) PackedValues |= 0x0008;
PackedValues |= ((dtr & 0x0003) << 4);
if (inDSR) PackedValues |= 0x0040;
if (txc) PackedValues |= 0x0080;
if (xOut) PackedValues |= 0x0100;
if (xIn) PackedValues |= 0x0200;
PackedValues |= ((rts & 0x0003) << 12); }
}
/// Reading and writing.
/// </summary>
[DllImport("kernel32.dll", SetLastError=true)]
internal static extern Boolean WriteFile(IntPtr fFile, Byte[] lpBuffer, UInt32 nNumberOfBytesToWrite,
out UInt32 lpNumberOfBytesWritten, IntPtr lpOverlapped); [StructLayout( LayoutKind.Sequential )] internal struct OVERLAPPED
{
internal UIntPtr Internal;
internal UIntPtr InternalHigh;
internal UInt32 Offset;
internal UInt32 OffsetHigh;
internal IntPtr hEvent;
} [DllImport("kernel32.dll")]
internal static extern Boolean SetCommMask(IntPtr hFile, UInt32 dwEvtMask); // Constants for dwEvtMask:
internal const UInt32 EV_RXCHAR = 0x0001;
internal const UInt32 EV_RXFLAG = 0x0002;
internal const UInt32 EV_TXEMPTY = 0x0004;
internal const UInt32 EV_CTS = 0x0008;
internal const UInt32 EV_DSR = 0x0010;
internal const UInt32 EV_RLSD = 0x0020;
internal const UInt32 EV_BREAK = 0x0040;
internal const UInt32 EV_ERR = 0x0080;
internal const UInt32 EV_RING = 0x0100;
internal const UInt32 EV_PERR = 0x0200;
internal const UInt32 EV_RX80FULL = 0x0400;
internal const UInt32 EV_EVENT1 = 0x0800;
internal const UInt32 EV_EVENT2 = 0x1000; [DllImport("kernel32.dll", SetLastError=true)]
internal static extern Boolean WaitCommEvent(IntPtr hFile, IntPtr lpEvtMask, IntPtr lpOverlapped); [DllImport("kernel32.dll")]
internal static extern Boolean CancelIo(IntPtr hFile);
[DllImport("kernel32.dll", SetLastError=true)]
internal static extern Boolean ReadFile(IntPtr hFile, [Out] Byte[] lpBuffer, UInt32 nNumberOfBytesToRead,
out UInt32 nNumberOfBytesRead, IntPtr lpOverlapped); [DllImport("kernel32.dll")]
internal static extern Boolean TransmitCommChar(IntPtr hFile, Byte cChar); /// <summary>
/// Control port functions.
/// </summary>
[DllImport("kernel32.dll")]
internal static extern Boolean EscapeCommFunction(IntPtr hFile, UInt32 dwFunc); // Constants for dwFunc:
internal const UInt32 SETXOFF = 1;
internal const UInt32 SETXON = 2;
internal const UInt32 SETRTS = 3;
internal const UInt32 CLRRTS = 4;
internal const UInt32 SETDTR = 5;
internal const UInt32 CLRDTR = 6;
internal const UInt32 RESETDEV = 7;
internal const UInt32 SETBREAK = 8;
internal const UInt32 CLRBREAK = 9;
[DllImport("kernel32.dll")]
internal static extern Boolean GetCommModemStatus(IntPtr hFile, out UInt32 lpModemStat); // Constants for lpModemStat:
internal const UInt32 MS_CTS_ON = 0x0010;
internal const UInt32 MS_DSR_ON = 0x0020;
internal const UInt32 MS_RING_ON = 0x0040;
internal const UInt32 MS_RLSD_ON = 0x0080; /// <summary>
/// Status Functions.
/// </summary>
[DllImport("kernel32.dll", SetLastError=true)]
internal static extern Boolean GetOverlappedResult(IntPtr hFile, IntPtr lpOverlapped,
out UInt32 nNumberOfBytesTransferred, Boolean bWait); [DllImport("kernel32.dll")]
internal static extern Boolean ClearCommError(IntPtr hFile, out UInt32 lpErrors, IntPtr lpStat);
[DllImport("kernel32.dll")]
internal static extern Boolean ClearCommError(IntPtr hFile, out UInt32 lpErrors, out COMSTAT cs); //Constants for lpErrors:
internal const UInt32 CE_RXOVER = 0x0001;
internal const UInt32 CE_OVERRUN = 0x0002;
internal const UInt32 CE_RXPARITY = 0x0004;
internal const UInt32 CE_FRAME = 0x0008;
internal const UInt32 CE_BREAK = 0x0010;
internal const UInt32 CE_TXFULL = 0x0100;
internal const UInt32 CE_PTO = 0x0200;
internal const UInt32 CE_IOE = 0x0400;
internal const UInt32 CE_DNS = 0x0800;
internal const UInt32 CE_OOP = 0x1000;
internal const UInt32 CE_MODE = 0x8000; [StructLayout( LayoutKind.Sequential )] internal struct COMSTAT
{
internal const uint fCtsHold = 0x1;
internal const uint fDsrHold = 0x2;
internal const uint fRlsdHold = 0x4;
internal const uint fXoffHold = 0x8;
internal const uint fXoffSent = 0x10;
internal const uint fEof = 0x20;
internal const uint fTxim = 0x40;
internal UInt32 Flags;
internal UInt32 cbInQue;
internal UInt32 cbOutQue;
}
[DllImport("kernel32.dll")]
internal static extern Boolean GetCommProperties(IntPtr hFile, out COMMPROP cp); [StructLayout( LayoutKind.Sequential )] internal struct COMMPROP
{
internal UInt16 wPacketLength;
internal UInt16 wPacketVersion;
internal UInt32 dwServiceMask;
internal UInt32 dwReserved1;
internal UInt32 dwMaxTxQueue;
internal UInt32 dwMaxRxQueue;
internal UInt32 dwMaxBaud;
internal UInt32 dwProvSubType;
internal UInt32 dwProvCapabilities;
internal UInt32 dwSettableParams;
internal UInt32 dwSettableBaud;
internal UInt16 wSettableData;
internal UInt16 wSettableStopParity;
internal UInt32 dwCurrentTxQueue;
internal UInt32 dwCurrentRxQueue;
internal UInt32 dwProvSpec1;
internal UInt32 dwProvSpec2;
internal Byte wcProvChar;
}
平时都要先初始化下,不初始化的话能否进行数据传输不得而直.
要初始化DCB COMSTAT 什么的,最起码的是也要CreateFile一下啊.或者CODE不全,全贴出来看再说吧....
以下是我的代码：
第一部分：
internal DCB PortDCB;
internal DCB dcb;
private IntPtr hPort;
private OVERLAPPED overlp;
private IntPtr ptrUWO = IntPtr.Zero;
private int writeCount;
public Csdn()
{
//
// TODO: 在此处添加构造函数逻辑
//
}
[DllImport("kernel32.dll", SetLastError=true)]
internal static extern IntPtr CreateFile(String lpFileName, UInt32 dwDesiredAccess, UInt32 dwShareMode,
IntPtr lpSecurityAttributes, UInt32 dwCreationDisposition, UInt32 dwFlagsAndAttributes,
IntPtr hTemplateFile); //Constants for errors:
internal const UInt32 ERROR_FILE_NOT_FOUND = 2;
internal const UInt32 ERROR_INVALID_NAME = 123;
internal const UInt32 ERROR_ACCESS_DENIED = 5;
internal const UInt32 ERROR_IO_PENDING = 997; //Constants for return value:
internal const Int32 INVALID_HANDLE_VALUE = -1; //Constants for dwFlagsAndAttributes:
internal const UInt32 FILE_FLAG_OVERLAPPED = 0x40000000; //Constants for dwCreationDisposition:
internal const UInt32 OPEN_EXISTING = 3; //Constants for dwDesiredAccess:
internal const UInt32 GENERIC_READ = 0x80000000;
internal const UInt32 GENERIC_WRITE = 0x40000000; [DllImport("kernel32.dll")]
internal static extern Boolean CloseHandle(IntPtr hObject); /// <summary>
/// Manipulating the communications settings.
/// </summary> [DllImport("kernel32.dll")]
internal static extern Boolean GetCommState(IntPtr hFile, ref DCB lpDCB); [DllImport("kernel32.dll")]
internal static extern Boolean GetCommTimeouts(IntPtr hFile, out COMMTIMEOUTS lpCommTimeouts); [DllImport("kernel32.dll")]
internal static extern Boolean BuildCommDCBAndTimeouts(String lpDef, ref DCB lpDCB, ref COMMTIMEOUTS lpCommTimeouts); [DllImport("kernel32.dll")]
internal static extern Boolean SetCommState(IntPtr hFile, [In] ref DCB lpDCB); [DllImport("kernel32.dll")]
internal static extern Boolean SetCommTimeouts(IntPtr hFile, [In] ref COMMTIMEOUTS lpCommTimeouts); [DllImport("kernel32.dll")]
internal static extern Boolean SetupComm(IntPtr hFile, UInt32 dwInQueue, UInt32 dwOutQueue); [StructLayout( LayoutKind.Sequential )] internal struct COMMTIMEOUTS
{
//JH1.1: Changed Int32 to UInt32 to allow setting to MAXDWORD
internal UInt32 ReadIntervalTimeout;
internal UInt32 ReadTotalTimeoutMultiplier;
internal UInt32 ReadTotalTimeoutConstant;
internal UInt32 WriteTotalTimeoutMultiplier;
internal UInt32 WriteTotalTimeoutConstant;
}
//JH1.1: Added to enable use of "return immediately" timeout.
internal const UInt32 MAXDWORD = 0xffffffff; [StructLayout( LayoutKind.Sequential )] internal struct DCB
{
internal Int32 DCBlength;
internal Int32 BaudRate;
internal Int32 PackedValues;
internal Int16 wReserved;
internal Int16 XonLim;
internal Int16 XoffLim;
internal Byte ByteSize;
internal Byte Parity;
internal Byte StopBits;
internal Byte XonChar;
internal Byte XoffChar;
internal Byte ErrorChar;
internal Byte EofChar;
internal Byte EvtChar;
internal Int16 wReserved1; internal void init(bool parity, bool outCTS, bool outDSR, int dtr, bool inDSR, bool txc, bool xOut,
bool xIn, int rts)
{
DCBlength = 28; PackedValues = 0x8001;
if (parity) PackedValues |= 0x0002;
if (outCTS) PackedValues |= 0x0004;
if (outDSR) PackedValues |= 0x0008;
PackedValues |= ((dtr & 0x0003) << 4);
if (inDSR) PackedValues |= 0x0040;
if (txc) PackedValues |= 0x0080;
if (xOut) PackedValues |= 0x0100;
if (xIn) PackedValues |= 0x0200;
PackedValues |= ((rts & 0x0003) << 12); }
}
[DllImport("kernel32.dll", SetLastError=true)]
private static extern Boolean WriteFile(IntPtr fFile, [MarshalAs( UnmanagedType.LPArray )]Byte[] lpBuffer, UInt32 nNumberOfBytesToWrite,
ref UInt32 lpNumberOfBytesWritten,ref OVERLAPPED lpOverlapped); [StructLayout(LayoutKind.Sequential)]
private struct OVERLAPPED
{
public int Internal;
public int InternalHigh;
public int Offset;
public int OffsetHigh;
public int hEvent;
} [DllImport("kernel32.dll")]
internal static extern Boolean SetCommMask(IntPtr hFile, UInt32 dwEvtMask); // Constants for dwEvtMask:
internal const UInt32 EV_RXCHAR = 0x0001;
internal const UInt32 EV_RXFLAG = 0x0002;
internal const UInt32 EV_TXEMPTY = 0x0004;
internal const UInt32 EV_CTS = 0x0008;
internal const UInt32 EV_DSR = 0x0010;
internal const UInt32 EV_RLSD = 0x0020;
internal const UInt32 EV_BREAK = 0x0040;
internal const UInt32 EV_ERR = 0x0080;
internal const UInt32 EV_RING = 0x0100;
internal const UInt32 EV_PERR = 0x0200;
internal const UInt32 EV_RX80FULL = 0x0400;
internal const UInt32 EV_EVENT1 = 0x0800;
internal const UInt32 EV_EVENT2 = 0x1000;
[DllImport("kernel32.dll", SetLastError=true)]
internal static extern Boolean WaitCommEvent(IntPtr hFile, IntPtr lpEvtMask, IntPtr lpOverlapped); [DllImport("kernel32.dll")]
internal static extern Boolean CancelIo(IntPtr hFile);
[DllImport("kernel32.dll", SetLastError=true)]
internal static extern Boolean ReadFile(IntPtr hFile, [Out] Byte[] lpBuffer, UInt32 nNumberOfBytesToRead,
out UInt32 nNumberOfBytesRead, IntPtr lpOverlapped); [DllImport("kernel32.dll")]
internal static extern Boolean TransmitCommChar(IntPtr hFile, Byte cChar); /// <summary>
/// Control port functions.
/// </summary>
[DllImport("kernel32.dll")]
internal static extern Boolean EscapeCommFunction(IntPtr hFile, UInt32 dwFunc); // Constants for dwFunc:
internal const UInt32 SETXOFF = 1;
internal const UInt32 SETXON = 2;
internal const UInt32 SETRTS = 3;
internal const UInt32 CLRRTS = 4;
internal const UInt32 SETDTR = 5;
internal const UInt32 CLRDTR = 6;
internal const UInt32 RESETDEV = 7;
internal const UInt32 SETBREAK = 8;
internal const UInt32 CLRBREAK = 9;
[DllImport("kernel32.dll")]
internal static extern Boolean GetCommModemStatus(IntPtr hFile, out UInt32 lpModemStat); // Constants for lpModemStat:
internal const UInt32 MS_CTS_ON = 0x0010;
internal const UInt32 MS_DSR_ON = 0x0020;
internal const UInt32 MS_RING_ON = 0x0040;
internal const UInt32 MS_RLSD_ON = 0x0080; /// <summary>
/// Status Functions.
/// </summary>
[DllImport("kernel32.dll", SetLastError=true)]
internal static extern Boolean GetOverlappedResult(IntPtr hFile, IntPtr lpOverlapped,
out UInt32 nNumberOfBytesTransferred, Boolean bWait); [DllImport("kernel32.dll")]
internal static extern Boolean ClearCommError(IntPtr hFile, out UInt32 lpErrors, IntPtr lpStat);
[DllImport("kernel32.dll")]
internal static extern Boolean ClearCommError(IntPtr hFile, out UInt32 lpErrors, out COMSTAT cs); //Constants for lpErrors:
internal const UInt32 CE_RXOVER = 0x0001;
internal const UInt32 CE_OVERRUN = 0x0002;
internal const UInt32 CE_RXPARITY = 0x0004;
internal const UInt32 CE_FRAME = 0x0008;
internal const UInt32 CE_BREAK = 0x0010;
internal const UInt32 CE_TXFULL = 0x0100;
internal const UInt32 CE_PTO = 0x0200;
internal const UInt32 CE_IOE = 0x0400;
internal const UInt32 CE_DNS = 0x0800;
internal const UInt32 CE_OOP = 0x1000;
internal const UInt32 CE_MODE = 0x8000; [StructLayout( LayoutKind.Sequential )] internal struct COMSTAT
{
internal const uint fCtsHold = 0x1;
internal const uint fDsrHold = 0x2;
internal const uint fRlsdHold = 0x4;
internal const uint fXoffHold = 0x8;
internal const uint fXoffSent = 0x10;
internal const uint fEof = 0x20;
internal const uint fTxim = 0x40;
internal UInt32 Flags;
internal UInt32 cbInQue;
internal UInt32 cbOutQue;
}
[DllImport("kernel32.dll")]
internal static extern Boolean GetCommProperties(IntPtr hFile, out COMMPROP cp); [StructLayout( LayoutKind.Sequential )] internal struct COMMPROP
{
internal UInt16 wPacketLength;
internal UInt16 wPacketVersion;
internal UInt32 dwServiceMask;
internal UInt32 dwReserved1;
internal UInt32 dwMaxTxQueue;
internal UInt32 dwMaxRxQueue;
internal UInt32 dwMaxBaud;
internal UInt32 dwProvSubType;
internal UInt32 dwProvCapabilities;
internal UInt32 dwSettableParams;
internal UInt32 dwSettableBaud;
internal UInt16 wSettableData;
internal UInt16 wSettableStopParity;
internal UInt32 dwCurrentTxQueue;
internal UInt32 dwCurrentRxQueue;
internal UInt32 dwProvSpec1;
internal UInt32 dwProvSpec2;
internal Byte wcProvChar;
}
#region "重写打开端口"
public bool opencomm()
{
bool lp=false;
PortDCB = new DCB();
string port="COM1";
//COMMTIMEOUTS CommTimeouts = new COMMTIMEOUTS();
//CommBaseSettings cs = CommSettings();;
//OVERLAPPED wo = new OVERLAPPED();
dcb=new DCB();
hPort = CreateFile(port, GENERIC_READ | GENERIC_WRITE, 0, IntPtr.Zero,
OPEN_EXISTING, FILE_FLAG_OVERLAPPED, IntPtr.Zero);
if(hPort!=(IntPtr)INVALID_HANDLE_VALUE)
{
lp=true;
GetCommState(hPort,ref dcb);
dcb.BaudRate=9600;
dcb.ByteSize=(byte)8;
dcb.Parity=(byte)0;
dcb.StopBits=(byte)1;
if(!SetCommState(hPort, ref dcb))
{
lp=false;
}
}
return(lp);
}
#endregion
#region "读取串口数据，返回其字节数"
public int GetComdata(byte [] read)
{
UInt32 gotbytes;
gotbytes=0;
if(hPort==ptrUWO) return(0);
COMSTAT cs;
UInt32 errs;
ClearCommError(hPort,out errs,out cs);
ReadFile(hPort,read,cs.cbInQue,out gotbytes,ptrUWO);
return(Convert.ToInt32(cs.cbInQue));
}
#endregion
#region "重写发送串口数据"
public int SetComdata(byte [] senddata)
{
if(hPort==ptrUWO) return(0);
uint sent=0;
writeCount=senddata.Length;
overlp=new OVERLAPPED();
WriteFile(hPort,senddata,(uint)writeCount,ref sent,ref overlp);
return(Convert.ToInt32(sent));
}
#endregion
}
另外,既然是FILE_FLAG_OVERLAPPED,最好在进行creat,write,read时候动用临界区或互斥量,以避免出现乱七八糟的问题(同步,变量被更改等等异步问题)
dcb.BaudRate=9600;
dcb.ByteSize=(byte)8;
dcb.Parity=(byte)0;
dcb.StopBits=(byte)1;
我用串口跟踪器看；ByteSize为７很奇怪；应该是8才对啊
我最后用c＋＋做的dll帮助初始化才解决问题