怎样监视已经打开的串口

http://www.codeguru.com/network/commspy.shtml

approach() :http://www.codeguru.com/network/commspy.shtml上的不能监视已经被别人打开的串口.

我也想知道，我在MSDN中看到这个函数，可能可以试试，由于没有时间亲自试，楼主如果试成功的话一定要把经验共享啊！
BOOL DuplicateHandle(
  HANDLE hSourceProcessHandle,  // handle to the source process
  HANDLE hSourceHandle,         // handle to duplicate
  HANDLE hTargetProcessHandle,  // handle to process to duplicate to
  LPHANDLE lpTargetHandle,  // pointer to duplicate handle
  DWORD dwDesiredAccess,    // access for duplicate handle
  BOOL bInheritHandle,      // handle inheritance flag
  DWORD dwOptions           // optional actions
)

PortMon用的应该不是这个方法。强烈关注

PortMon用的可能是替换设备驱动程序的方法。

sbw(清风一笑) CAO 这也行？不是一台机了

Saimen(单身情人) 虽不是一台机，但是这也是一种方法呀。

不能用两个串口或两台机器，启动自己的程序，监视一个已经被打开串口的收、发数据。大家可以下载一个PortMon程序，体验一下。如果用到设备驱动一级，那肯定与操作系统有关。roaringwind(www.gjwtech.com)能说的具体点吗？

呵呵,sbw(清风一笑) 的主意我倒是真的用过,为了测试的话好像真的挺省事的,:)
不过不用两个机器啊,做一根线,两个头,一般机器都是两个串口么,都插上,只管读
另外一个就可以了,要是非用driver,wdm的就行了吧,在port class 加一个过滤,我在2K上干过,98应该也没问题,反正不大会有人再坚持用95了吧

// 工作者线程，负责监视串行口
UINT CommProc(LPVOID pParam)
{
OVERLAPPED os;
DWORD dwMask, dwTrans;
COMSTAT ComStat;
DWORD dwErrorFlags;
CNcfileCtrlDlg *pDoc = (CNcfileCtrlDlg*)pParam;
memset(&os, 0, sizeof(OVERLAPPED));
os.hEvent=CreateEvent(NULL, TRUE, FALSE, NULL);
if(os.hEvent == NULL)
{
::MessageBox(NULL,"不能创建事件对象!","警告",
MB_ICONWARNING | MB_OK);
return (UINT)-1;
}
while(pDoc->m_bConnected)
{
ClearCommError(pDoc->m_hCom,&dwErrorFlags,&ComStat);
if(ComStat.cbInQue)
{
// 无限等待WM_COMMNOTIFY消息被处理完
WaitForSingleObject(pDoc->m_hPostMsgEvent, INFINITE);
ResetEvent(pDoc->m_hPostMsgEvent);//置为无信号
// 通知对话框
PostMessage(pDoc->m_hTermWnd, WM_COMMNOTIFY, EV_RXCHAR, 0);
continue;
} dwMask = 0;
if(!WaitCommEvent(pDoc->m_hCom, &dwMask, &os)) // 重叠操作,等待SetCommMask设定的事件出现
{
if(GetLastError() == ERROR_IO_PENDING)
{
// 无限等待重叠操作结果,如果EV_RXCHAR事件发生(串口收到字符并放入输入缓冲区中)
// 那么函数就结束等待。
GetOverlappedResult(pDoc->m_hCom, &os, &dwTrans, TRUE);
}
else
{
CloseHandle(os.hEvent);
return (UINT)-1;
}
}

}
CloseHandle(os.hEvent); pDoc->ReceiveThread = false; return 0;  // 线程正常结束
}
// 工作者线程，负责发送数据
UINT CommProcT(LPVOID pParam)
{

DWORD FileLength;
DWORD Remainder;  // 余数
DWORD Size;       // 进程条每一格的字符数
DWORD j = 0;
BOOL fState;
DWORD length,dwLength = 1;  // 成功写入缓冲区的字符数
COMSTAT ComStat;
DWORD dwErrorFlags;
/*
HWND hwnd;
CNcfileCtrlDlg dlg;
hwnd=dlg.GetSafeHwnd();
CNcfileCtrlDlg *pDoc=(CNcfileCtrlDlg *)GetWindow(hwnd,GW_OWNER);
*/
CNcfileCtrlDlg *pDoc = (CNcfileCtrlDlg*)pParam;
FileLength = pDoc->m_sNcFile.GetLength();    Remainder = FileLength%20;  // 进程条范围从0到20
Size = (FileLength-Remainder)/20; for(DWORD i=0; i<FileLength; i++)
{
char m_cChar;
if(i%Size == 0)      // 显示进度
{
pDoc->m_cProgress.SetPos(j);
j++;
}
if(i == (FileLength-1))
pDoc->m_cProgress.SetPos(20);

if(WaitForSingleObject(pDoc->m_hKillThreadT,0)==WAIT_OBJECT_0) //终止线程事件有信号
{
            pDoc->GetDlgItem(IDC_STOPT)->EnableWindow(FALSE);
pDoc->GetDlgItem(IDC_RECEIVE)->EnableWindow(TRUE);
pDoc->GetDlgItem(IDC_SENDING)->EnableWindow(TRUE);
pDoc->BeginThread=false;
//终止监视通信事件线程
TerminateThread(pDoc->m_pThreadEvent->m_hThread,0);
pDoc->EventThread=false;
AfxEndThread(0);   //退出线程
} if(pDoc->m_bXon)
WaitForSingleObject(pDoc->m_hXonEvent,INFINITE);
if(pDoc->m_bRts)
WaitForSingleObject(pDoc->m_hRtsEvent,INFINITE);
if(pDoc->m_bDsr)
WaitForSingleObject(pDoc->m_hDtrEvent,INFINITE); m_cChar = pDoc->m_sNcFile.GetAt(i);
ClearCommError(pDoc->m_hCom,&dwErrorFlags,&ComStat);
fState = WriteFile(pDoc->m_hCom,&m_cChar,dwLength,&length,&pDoc->m_osWrite);
if(!fState){
if(GetLastError() == ERROR_IO_PENDING)   //写操作被挂起
{
if(!GetOverlappedResult(pDoc->m_hCom,&pDoc->m_osWrite,&length,TRUE)) //写操作没有成功完成
{
::MessageBox(NULL,"发送代码出现错误!","错误",
MB_ICONERROR | MB_OK);
}
}
else
length=0;
}

if(!length)
{
::MessageBox(NULL,"发送代码出现错误,可能机床没准备好!","错误",
MB_ICONERROR | MB_OK);
pDoc->GetDlgItem(IDC_SENDING)->EnableWindow(TRUE);
            pDoc->GetDlgItem(IDC_RECEIVE)->EnableWindow(TRUE);
        pDoc->GetDlgItem(IDC_STOPT)->EnableWindow(FALSE);
        pDoc->GetDlgItem(IDC_STOPING)->EnableWindow(FALSE);// return (UINT)-1;
pDoc->BeginThread = false;
TerminateThread(pDoc->m_pThreadEvent->m_hThread,0);
pDoc->EventThread = false;
AfxEndThread(0);   //退出线程
}
}
pDoc->GetDlgItem(IDC_SENDING)->EnableWindow(TRUE);
    pDoc->GetDlgItem(IDC_RECEIVE)->EnableWindow(TRUE);
pDoc->GetDlgItem(IDC_STOPT)->EnableWindow(FALSE);
pDoc->GetDlgItem(IDC_STOPING)->EnableWindow(FALSE); pDoc->BeginThread = false;
    //终止监视通信事件线程
TerminateThread(pDoc->m_pThreadEvent->m_hThread,0);
pDoc->EventThread = false;

if(::MessageBox(NULL,"发送完毕!","提示", MB_ICONINFORMATION | MB_OK) == IDOK)//;
{
pDoc->m_cProgress.SetPos(0);
}
/* if(AfxMessageBox("发送完毕!",MB_OKCANCEL) == IDOK)
{

int m_iNumber;
int m_iLine;
LPSTR buf;
CString m_sTemp1;
buf = m_sTemp1.GetBuffer(2048);
m_iLine = pDoc->m_cNcFile.GetLineCount();
m_iNumber = pDoc->m_cNcFile.GetLine(m_iLine,buf,2048);
buf[m_iNumber] = '\0';
m_sTemp1.ReleaseBuffer();
pDoc->m_sEnd = buf;
pDoc->UpdateData(false);
}*/ return 0; //线程正常结束}
// 工作者线程，负责监测通信事件
UINT CommProcEvent(LPVOID pParam)
{
DWORD dwCommEvent = 0,dwTrans,dwModemStatus;
DWORD dwStoredFlags;
OVERLAPPED osStatus = {0};
char buf;
BOOL fCTS,fDSR;
DWORD length = 1; CNcfileCtrlDlg *pDoc = (CNcfileCtrlDlg*)pParam;
dwStoredFlags = EV_CTS | EV_DSR | EV_RXCHAR; // 设置事件掩码
SetCommMask(pDoc->m_hCom,0);
if(!SetCommMask(pDoc->m_hCom,dwStoredFlags))
{
pDoc->EventThread = false;
return 0;
} // 为重叠osStatus创建事件对象，手工重置，初始化为无信号的
osStatus.hEvent=CreateEvent(NULL,TRUE,FALSE,NULL);
if(osStatus.hEvent == NULL)
{
return 0;
pDoc->EventThread = false;
} if(!GetCommModemStatus(pDoc->m_hCom,&dwModemStatus))
{
::MessageBox(NULL,"不能获得针脚电压状态!","警告", MB_ICONWARNING | MB_OK);
pDoc->EventThread = false;
return 0;
}
else
{
// RTS/CTS流控协议
fCTS = MS_CTS_ON &dwModemStatus;
if(fCTS)
SetEvent(pDoc->m_hRtsEvent); // 置为有信号,可以发送;
else
ResetEvent(pDoc->m_hRtsEvent); // 置为无信号,不能发送; // DTR/DSR流控协议
fDSR = MS_DSR_ON & dwModemStatus;
if(fDSR)
SetEvent(pDoc->m_hDtrEvent); // 置为有信号,可以发送
else
ResetEvent(pDoc->m_hDtrEvent); // 置为无信号,不能发送
} while(pDoc->m_bConnected)
{
if(!WaitCommEvent(pDoc->m_hCom, &dwCommEvent, &osStatus)) // 重叠操作,等待SetCommMask设定的事件出现
{
if(GetLastError() == ERROR_IO_PENDING)
{
// 无限等待重叠操作结果,如果设定的事件发生，那么函数就结束等待。
GetOverlappedResult(pDoc->m_hCom, &osStatus, &dwTrans, TRUE);
}
// XON/XOFF协议
if ( ( dwCommEvent & EV_RXCHAR ) == EV_RXCHAR )
{
ReadFile(pDoc->m_hCom,&buf,length,&length,&pDoc->m_osRead);
if(buf == XOFF)
ResetEvent(pDoc->m_hXonEvent);  // 置为无信号,不能发送;
if(buf == XON)
SetEvent(pDoc->m_hXonEvent);    // 置为有信号,可以发送;
}
// RTS/CTS协议
if ( ( dwCommEvent & EV_CTS ) == EV_CTS )
{
if(!GetCommModemStatus(pDoc->m_hCom,&dwModemStatus))
{
::MessageBox(NULL,"不能获得针脚电压状态!","警告", MB_ICONWARNING | MB_OK);
pDoc->EventThread = false;
return 0;
}
else
{
fCTS = MS_CTS_ON &dwModemStatus;
if(fCTS)
SetEvent(pDoc->m_hRtsEvent);    // 置为有信号,可以发送;
else
ResetEvent(pDoc->m_hRtsEvent);  // 置为无信号,不能发送;
}
}
// DTR/DSR协议
if ( ( dwCommEvent & EV_DSR ) == EV_DSR )
{
if(!GetCommModemStatus(pDoc->m_hCom,&dwModemStatus))
{
::MessageBox(NULL,"不能获得针脚电压状态!","警告", MB_ICONWARNING | MB_OK);
pDoc->EventThread = false;
return 0;
}
else
{
fDSR = MS_DSR_ON & dwModemStatus;
if(fDSR)
SetEvent(pDoc->m_hDtrEvent);   // 置为有信号,可以发送
else
ResetEvent(pDoc->m_hDtrEvent); // 置为无信号,不能发送
}
}
}
}//////////////////////////////////////////////////////////////////////
// 测试代码
//   CNcfileCtrlDlg *pDoc=(CNcfileCtrlDlg*)pParam;
// while(pDoc->m_bConnected)
// {
// WaitForSingleObject(pDoc->m_hRtsEvent,10000);
// SetEvent(pDoc->m_hXonEvent);
// }
///////////////////////////////////////////////////////////////////////
pDoc->Eve

hook api
直接hook ReadFile,WriteFile不就搞定了

我也想用hook，怎么hook? yousen(一个人流浪)

请问 nuaawyd(神啊，救救我吧!) ：CNcfileCtrlDlg作了什么事？

调试易

怎样监视已经打开的串口

解决方案 »