我有一个地磅应用程序，以前从 Klerkscale SASCALE 读取数据，现在它还需要从 LS210 Opticon 地磅读取数据。我添加了代码以将波特率等设置为 OPTI，但我仍然收到“没有来自 comm 端口的响应”的错误，此错误来自 ERR00009（如果您查看 swith 语句的默认部分。任何人都可以请帮我纠正代码。
AnsiString TfrmWeighDetails::GetMass()
{
LONG lLastError = ERROR_SUCCESS;
bool flag;AnsiString s;
AnsiString port;
bool vTrapErrors, vIgnoreRecvEvent;
DM->vErrLineNo="GCS-21052008-70";
if ( Scale == "INVALID PORT")
{
return "ERR0011";
}
// Attempt to open the serial port (COM1)
lLastError = serial.Open(_T(Scale.c_str()),0,0,true);
MessageBox(NULL,AnsiString(lLastError).c_str(),"Privesh Test",MB_OK);
if (lLastError != ERROR_SUCCESS)
{
return "ERR0001";
}
// Setup the serial port (9600,8N1, which is the default setting)
// lLastError = serial.Setup(CSerial::EBaud9600,CSerial::EData8,CSerial::EParNone,CSerial::EStop1);
lLastError = serial.Setup(CSerial::EBaud19200,CSerial::EData8,CSerial::EParNone,CSerial::EStop1);
if (BridgeSupplier == "OPTO")
MessageBox(NULL,AnsiString(lLastError).c_str(),"Privesh Test1",MB_OK);
lLastError = serial.Setup(CSerial::EBaud19200,CSerial::EData8,CSerial::EParNone,CSerial::EStop1);
if (BridgeSupplier == "KLERKSCALE")
lLastError = serial.Setup(CSerial::EBaud2400,CSerial::EData7,CSerial::EParOdd,CSerial::EStop1);
else
lLastError = serial.Setup(CSerial::EBaud1200,CSerial::EData7,CSerial::EParEven,CSerial::EStop1);
if (lLastError != ERROR_SUCCESS)
{
return "ERR0002";
}
// Setup handshaking (default is no handshaking)
lLastError = serial.SetupHandshaking(CSerial::EHandshakeHardware);
MessageBox(NULL,AnsiString(lLastError).c_str(),"Handshake",MB_OK);
if (lLastError != ERROR_SUCCESS)
{
return "ERR0003";
}
// Register only for the receive event
lLastError = serial.SetMask(CSerial::EEventBreak |
CSerial::EEventCTS |
CSerial::EEventDSR |
CSerial::EEventError |
CSerial::EEventRing |
CSerial::EEventRLSD |
CSerial::EEventRecv);
MessageBox(NULL,AnsiString(lLastError).c_str(),"Receive Event",MB_OK);
if (lLastError != ERROR_SUCCESS)
{
return "ERR0004";
}
// Use 'non-blocking' reads, because we don't know how many bytes
// will be received. This is normally the most convenient mode
// (and also the default mode for reading data).
lLastError = serial.SetupReadTimeouts(CSerial::EReadTimeoutNonblocking);
MessageBox(NULL,AnsiString(lLastError).c_str(),"Setup Read Timeouts",MB_OK);
if (lLastError != ERROR_SUCCESS)
{
return "ERR0005";
}
// Create a handle for the overlapped operations
HANDLE hevtOverlapped = ::CreateEvent(0,TRUE,FALSE,0);;
if (hevtOverlapped == 0)
{
return "ERR0006";
}
// Setup the overlapped structure
OVERLAPPED ov = {0};
ov.hEvent = hevtOverlapped;
// Open the "STOP" handle
HANDLE hevtStop = ::CreateEvent(0,TRUE,FALSE,_T("Overlapped_Stop_Event"));
if (hevtStop == 0)
{
return "ERR0007" ;
}
// Keep reading data, until an EOF (CTRL-Z) has been received
bool fContinue = true;
do
{
// Wait for an event
lLastError = serial.WaitEvent(&ov);
MessageBox(NULL,AnsiString(lLastError).c_str(),"Serial Wait Event",MB_OK);
if (lLastError != ERROR_SUCCESS)
{
return "ERR0010";
}
// Setup array of handles in which we are interested
HANDLE ahWait[2];
ahWait[0] = hevtOverlapped;
ahWait[1] = hevtStop;
// Wait until something happens
switch (::WaitForMultipleObjects(sizeof(ahWait)/sizeof(*ahWait),ahWait,FALSE,timeout.ToInt()))
{
case WAIT_OBJECT_0:
{
// Save event
const CSerial::EEvent eEvent = serial.GetEventType();
// Handle break event
if (eEvent & CSerial::EEventBreak)
{
MessageBox(NULL," BREAK received ","Comm Program",MB_OK);
}
// Handle CTS event
if (eEvent & CSerial::EEventCTS)
{
flag = serial.GetCTS();
if (flag)
s = "ON";
else
s = "OFF";
MessageBox(NULL,(AnsiString("Clear to send ") + s).c_str(),"Comm Prog",MB_OK);
}
// Handle DSR event
if (eEvent & CSerial::EEventDSR)
{
flag = serial.GetDSR();
if (flag)
s = "ON";
else
s = "OFF";
MessageBox(NULL,(AnsiString("Data set ready ") + s).c_str(),"Comm Prog",MB_OK);
}
// Handle error event
vTrapErrors=false;
if ((eEvent & CSerial::EEventError)&&
(vTrapErrors)) // Although errors encountered, mass still read on XP OS. Therefore, errors suppressed on XP i.e.vTrapErrors=false - MZI12112007
{
//MessageBox(NULL,"### ERROR: ");
switch (serial.GetError())
{
case CSerial::EErrorBreak: MessageBox(NULL,"Break condition","Com Prog",MB_OK); break;
case CSerial::EErrorFrame: MessageBox(NULL,"Framing error","Com Prog",MB_OK); break;
case CSerial::EErrorIOE: MessageBox(NULL,"IO device error","Com Prog",MB_OK); break;
case CSerial::EErrorMode: MessageBox(NULL,"Unsupported mode","Com Prog",MB_OK); break;
case CSerial::EErrorOverrun: MessageBox(NULL,"Buffer overrun","Com Prog",MB_OK); break;
case CSerial::EErrorRxOver: MessageBox(NULL,"Input buffer overflow","Com Prog",MB_OK); break;
case CSerial::EErrorParity: MessageBox(NULL,"Input parity error","Com Prog",MB_OK); break;
case CSerial::EErrorTxFull: MessageBox(NULL,"Output buffer full","Com Prog",MB_OK); break;
// default: MessageBox(NULL,"Unknown","Com Prog",MB_OK); break; // Error 0 is UNKNOWN but is a Success error therefore no need to handle -- MZI12112007
}
//printf(" ###\n");
}
// Handle ring event
if (eEvent & CSerial::EEventRing)
{
Sleep(2000);
}
// Handle RLSD/CD event
if (eEvent & CSerial::EEventRLSD)
{
flag = serial.GetRLSD();
if (flag)
s = "ON";
else
s = "OFF";
MessageBox(NULL,(AnsiString("RLSD/CD ") + s).c_str(),"Comm Prog",MB_OK);
}
Timer1->Enabled = false; //switch off the timeout
// Handle data receive event
Sleep (1000); // when no pause, no mass read on XP. Therefore, this ensures system gets in sync with Comm Device - MZI12112007
vIgnoreRecvEvent=true; // On XP, the Receive event does not seem to be triggered. Therefore this code was included to forcce WBR to work on Xp -- MZI12112007
if ((eEvent & CSerial::EEventRecv)||vIgnoreRecvEvent)
{
// Read data, until the reading from scale is stable
DWORD dwBytesRead = 0;
do
{
char szBuffer[101];
// Read data from the COM-port
lLastError = serial.Read(szBuffer,sizeof(szBuffer)-1,&dwBytesRead);
if (lLastError != ERROR_SUCCESS)
{
ShowError(serial.GetLastError(), _T("Unable to read from COM-port."));
return "ERR0008";
}
if (dwBytesRead > 0)
{
// Finalize the data, so it is a valid string
szBuffer[dwBytesRead] = '\0';
AnsiString result = GetStableReading(szBuffer,BridgeSupplier);
// Display the data
if ( result == "OVERCAPACITY" || result == "BELOWCAPACITY")
{
serial.Close();
return result;
}
else if ( result != "ERROR" && result != "")
{
serial.Close();
return result;
}
}
}
while ((dwBytesRead > 0 )&&(result == ""));
}
}
break;
case WAIT_OBJECT_0+1:
{
// Set the continue bit to false, so we'll exit
fContinue = false;
}
break;
default:
{
//No response from comm port
serial.Close();
return "ERR0009";
}
}
}
while (fContinue);
// Close the port again
serial.Close();
}