vc 用mscomm奇怪问题
问题是用vc的程序给下位机发送读数据命令，但每次都返回两组数据，我由用vb做了一个是正常的，发送一个指令，就返回一组数据如果先运行vc的程序，再运行vb的程序第一次会获得两组数据，以后就正常了,那位能帮忙看看
vc的接收代码:
//打开串口
BOOL CMscommDlg::CommOpen(CMSComm &MSCOMIN,int COMPortNOIN)
{
// TODO: Add your control notification handler code here
//如果串口打开则关闭
if(MSCOMIN.GetPortOpen())
{
MSCOMIN.SetPortOpen(FALSE);
}
short i;
i=(short)COMPortNOIN;
try
{
MSCOMIN.SetCommPort(i); //选择com
m_mscomm.SetInputMode(1);//1：表示以二进制方式检取数据
m_mscomm.SetInBufferSize(1024); //接收缓冲区
m_mscomm.SetOutBufferSize(1024);//发送缓冲区
m_mscomm.SetSettings(m_CommSettingStr);
m_mscomm.SetRThreshold(1); //参数1表示每当串口接收缓冲区中有多于或等于1个字符时将引发一个接收数据的OnComm事件
if(!m_mscomm.GetPortOpen())
{
m_mscomm.SetPortOpen(TRUE);//打开串口
}
m_mscomm.SetInputLen(0); //// 每次读取缓冲区中 所有数据
m_mscomm.GetInput();//先预读缓冲区以清除残留数据
}
catch(CException *e)
{
TCHAR errormsg;
e->GetErrorMessage (errormsg,255,NULL);
CString msg;
msg.Format("端口COM%i无效,请检查串口是否被其它程序占用或硬件连线错误\r\n\r\n错误描述:",i);
msg+=errormsg;
MessageBox(msg,"无法打开串口",MB_ICONSTOP);
return FALSE;
}
//保存INI
CMyInI myini;
myini.Put("COM",(int)i);
myini.Put("COMSetting",m_CommSettingStr);
//CString title;
//title.Format("智能充电架数据服务器v1.0COM%i",(int)i);
//this->SetWindowText(title);
return TRUE;
}
//串口接收事件
void CMscommDlg::OnOnCommMscomm1()
{
if( m_mscomm.GetCommEvent()==2) //事件值为2表示接收缓冲区内有字符
{
COleVariant myVar;
COleSafeArray safearray_inp;
LONG len,k;
sleep(10);
myVar.Attach(m_mscomm.GetInput()); //读缓冲区
safearray_inp=myVar;
len=safearray_inp.GetOneDimSize(); //得到有效数据长度
if (len>0)
{
for(k=0;k<len;k++)
{
safearray_inp.GetElement(&k,FrameProcesser.rxdata+k);//转换为BYTE型数组
}
FrameProcesser.StreamInput(FrameProcesser.rxdata,len);
//串口收到数据处理函数
CommRev();
}
}
}
下面是抓的包
//=======================================================用vc的===============================================================
1 IRP_MJ_CLOSE Port Closed
2 IRP_MJ_CREATE Port Opened - mscomm.exe
3 IOCTL_SERIAL_SET_BAUD_RATE Baud Rate: 9600
4 IOCTL_SERIAL_SET_LINE_CONTROL StopBits: 1, Parity: No, DataBits: 8
//发送读数据指令
5 IRP_MJ_WRITE Length: 0007, Data: 55 AA 03 F2 01 01 F7
//返回数据 这里有问题 返回了两组 55 AA开头的
6 IRP_MJ_READ Length: 0004, Data: 55 AA 11 F3
7 IRP_MJ_READ Length: 0015, Data: 01 01 58 00 00 00 00 00 00 00 34 00 00 00 00
8 IRP_MJ_READ Length: 0002, Data: 00 92
//不应该有这一组
9 IRP_MJ_READ Length: 0009, Data: 55 AA 11 F3 01 01 58 00 00
10 IRP_MJ_READ Length: 0012, Data: 00 00 00 00 00 34 00 00 00 00 00 92
//发送另一个读数据指令
11 IRP_MJ_WRITE Length: 0007, Data: 55 AA 03 F2 01 02 F8
//==========================================================用vb的============================================================
1 IRP_MJ_CLOSE Port Closed
2 IRP_MJ_CREATE Port Opened - HD_vbserial1.exe
3 IOCTL_SERIAL_SET_BAUD_RATE Baud Rate: 9600
4 IOCTL_SERIAL_SET_LINE_CONTROL StopBits: 1, Parity: No, DataBits: 8
//发送读数据指令
5 IRP_MJ_WRITE Length: 0009, Data: 55 AA 05 F2 01 01 01 01 FB
//返回数据 第一次返回了两组 55 AA开头的
6 IRP_MJ_READ Length: 0001, Data: 55
7 IRP_MJ_READ Length: 0001, Data: AA
8 IRP_MJ_READ Length: 0002, Data: 11 F3
9 IRP_MJ_READ Length: 0002, Data: 01 01
10 IRP_MJ_READ Length: 0002, Data: 0C 00
11 IRP_MJ_READ Length: 0001, Data: 00
12 IRP_MJ_READ Length: 0001, Data: 00
13 IRP_MJ_READ Length: 0001, Data: 00
14 IRP_MJ_READ Length: 0001, Data: 00
15 IRP_MJ_READ Length: 0001, Data: 00
16 IRP_MJ_READ Length: 0001, Data: 00
17 IRP_MJ_READ Length: 0001, Data: 34
18 IRP_MJ_READ Length: 0001, Data: 00
19 IRP_MJ_READ Length: 0001, Data: 00
20 IRP_MJ_READ Length: 0001, Data: 00
21 IRP_MJ_READ Length: 0003, Data: 00 00 46
22 IRP_MJ_READ Length: 0001, Data: 55
23 IRP_MJ_READ Length: 0002, Data: AA 11
24 IRP_MJ_READ Length: 0002, Data: F3 01
25 IRP_MJ_READ Length: 0001, Data: 01
26 IRP_MJ_READ Length: 0002, Data: 0C 00
27 IRP_MJ_READ Length: 0002, Data: 00 00
28 IRP_MJ_READ Length: 0002, Data: 00 00
29 IRP_MJ_READ Length: 0002, Data: 00 00
30 IRP_MJ_READ Length: 0002, Data: 34 00
31 IRP_MJ_READ Length: 0002, Data: 00 00
32 IRP_MJ_READ Length: 0002, Data: 00 00
33 IRP_MJ_READ Length: 0001, Data: 46
//发送读数据指令 以后就正确了
34 IRP_MJ_WRITE Length: 0009, Data: 55 AA 05 F2 01 01 01 01 FB
//返回正确数据
35 IRP_MJ_READ Length: 0001, Data: 55
36 IRP_MJ_READ Length: 0003, Data: AA 11 F3
37 IRP_MJ_READ Length: 0003, Data: 01 01 20
38 IRP_MJ_READ Length: 0004, Data: 00 00 00 00
39 IRP_MJ_READ Length: 0004, Data: 00 00 00 34
40 IRP_MJ_READ Length: 0004, Data: 00 00 00 00
41 IRP_MJ_READ Length: 0002, Data: 00 5A
//发送读数据指令
42 IRP_MJ_WRITE Length: 0009, Data: 55 AA 05 F2 01 01 01 01 FB
//返回正确数据
43 IRP_MJ_READ Length: 0001, Data: 55
44 IRP_MJ_READ Length: 0003, Data: AA 11 F3
45 IRP_MJ_READ Length: 0002, Data: 01 01
46 IRP_MJ_READ Length: 0004, Data: 20 00 00 00
47 IRP_MJ_READ Length: 0005, Data: 00 00 00 00 34
48 IRP_MJ_READ Length: 0006, Data: 00 00 00 00 00 5A
//发送读数据指令
49 IRP_MJ_WRITE Length: 0009, Data: 55 AA 05 F2 01 01 01 01 FB
//返回正确数据
50 IRP_MJ_READ Length: 0001, Data: 55
51 IRP_MJ_READ Length: 0003, Data: AA 11 F3
52 IRP_MJ_READ Length: 0004, Data: 01 01 20 00
53 IRP_MJ_READ Length: 0009, Data: 00 00 00 00 00 00 34 00 00
54 IRP_MJ_READ Length: 0004, Data: 00 00 00 5A 以下蓝色文字由版主：kingofkings 于：2009-04-24,14:01:32 加入。<font color=black>请发贴人注意：本贴放在这分区不合适，即将移走
原来分区：AVR32技术论坛
即将移去的分区：上位机软件开发(Delphi，C++等)
移动执行时间：自本贴发表0小时后
任何的疑问或咨询，请可随时联系站长。谢谢你的支持!</font> 不用MSCOMM了很垃圾，改用CserialPort了，自己又改了一下，原来CserialPort只可以接收一个字符，改为接收缓冲区了，最多一次接收1024个，自我感觉良好
点击此处下载VC工程文件ourdev_440279.rar(文件大小:164K) (原文件名:My_serialport.rar)
#ifndef __SERIALPORT_H__
#define __SERIALPORT_H__
//修改BY 中国传惠 Transmart gongxd@126.com,模拟Mscomm
//2009-4-24 修改为读取缓冲区了
//unsigned char RXBuff; //为读缓冲区
//DWORD RXBuffCount; //读得数据大小
//2009-4-25 setsetings()
#define WM_COMM_BREAK_DETECTED WM_USER+1 // A break was detected on input.
#define WM_COMM_CTS_DETECTED WM_USER+2 // The CTS (clear-to-send) signal changed state.
#define WM_COMM_DSR_DETECTED WM_USER+3 // The DSR (data-set-ready) signal changed state.
#define WM_COMM_ERR_DETECTED WM_USER+4 // A line-status error occurred. Line-status errors are CE_FRAME, CE_OVERRUN, and CE_RXPARITY.
#define WM_COMM_RING_DETECTED WM_USER+5 // A ring indicator was detected.
#define WM_COMM_RLSD_DETECTED WM_USER+6 // The RLSD (receive-line-signal-detect) signal changed state.
#define WM_COMM_RXCHAR WM_USER+7 // A character was received and placed in the input buffer.
#define WM_COMM_RXFLAG_DETECTED WM_USER+8 // The event character was received and placed in the input buffer.
#define WM_COMM_TXEMPTY_DETECTED WM_USER+9 // The last character in the output buffer was sent.
#include <afxtempl.h>
class CSerialPort
{
//自定义属性
public:
unsigned char RXBuff;
DWORD RXBuffCount;
//自定义函数
public:
BOOL Create(CWnd* pParentWnd);
void SetCommPort(short nNewValue);
short GetCommPort();
void SetSettings(LPCTSTR lpszNewValue);
CString GetSettings();
long GetInBufferCount();
unsigned char * GetInput();
void SetOutput(unsigned char *sbuff,int sbufflen);
BOOLSetPortOpen(BOOL bNewValue);
BOOL SetPortOpen(CWnd* pw,BOOL bNewValue);
BOOL GetPortOpen();
CStringGetLastError();
//自定义
protected:
//串口打开
BOOL m_PortOpened;
CString m_COMSettings;
void CString_Split(CString &string, LPCTSTR separator,CArray<CString,CString&> & outArr);
CString errmsg;
UINT Comportno;
UINT ComBaud;
char Comparity;
UINT Comdatabits;
UINT Comstopbits;
public:
int m_nWriteSize;
void ClosePort();
// contruction and destruction
CSerialPort();
virtual ~CSerialPort();
// port initialisation
BOOL InitPort(CWnd* pPortOwner, UINT portnr = 1, UINT baud = 9600, char parity = 'N', UINT databits = 8, UINT stopbits = 1, DWORD dwCommEvents = EV_RXCHAR, UINT writebuffersize = 1024);
HANDLE m_hComm;
// start/stop comm watching
BOOL StartMonitoring();
BOOL RestartMonitoring();
BOOL StopMonitoring();
DWORD GetWriteBufferSize();
DWORD GetCommEvents();
DCB GetDCB();
void WriteToPort(char* string);
void WriteToPort(char* string,int n);
void WriteToPort(unsigned char* string,int n);
void WriteToPort(LPCTSTR string);
void WriteToPort(LPCTSTR string,int n);
protected:
// protected memberfunctions
void ProcessErrorMessage(char* ErrorText) ;
static UINT CommThread(LPVOID pParam);
static void ReceiveChar(CSerialPort* port, COMSTAT comstat);
static void WriteChar(CSerialPort* port);
// thread
CWinThread* m_Thread;
// synchronisation objects
CRITICAL_SECTION m_csCommunicationSync;
BOOL m_bThreadAlive;
// handles
HANDLE m_hWriteEvent;
HANDLE m_hShutdownEvent;
// Event array.
// One element is used for each event. There are two event handles for each port.
// A Write event and a receive character event which is located in the overlapped structure (m_ov.hEvent).
// There is a general shutdown when the port is closed.
HANDLE m_hEventArray;
// structures
OVERLAPPED m_ov;
COMMTIMEOUTS m_CommTimeouts;
DCB m_dcb;
// owner window
CWnd* m_pOwner;
// misc
UINT m_nPortNr;
char* m_szWriteBuffer;
DWORD m_dwCommEvents;
DWORD m_nWriteBufferSize;
};
#endif __SERIALPORT_H__ 都已经用VC了,最直接的是从 CreateFile 自己打开 COM 做,自己全面控制 RS232,要想简单用 CSerial 类,这个在 CodeProject 有源码下载的.
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