bool CSerial::Open(QString portName, DWORD dwInQueue, DWORD dwOutQueue, bool fOverlapped)
{
// Reset error state
m_lLastError = ERROR_SUCCESS;
// Check if the port isn't already opened
if (m_hFile)
return true;
// Open the device
m_hFile = CreateFileA(portName.toAscii(),
GENERIC_READ|GENERIC_WRITE,
0,
0,
OPEN_EXISTING,
fOverlapped?FILE_FLAG_OVERLAPPED:0,
0);
// Check if the opening was successful.
if (m_hFile == INVALID_HANDLE_VALUE)
{
m_hFile = 0;
return false;
}
#ifndef SERIAL_NO_OVERLAPPED
// We cannot have an event handle yet
//_ASSERTE(m_hevtOverlapped == 0);
// Create the event handle for internal overlapped operations (manual reset)
if (fOverlapped)
{
m_hevtOverlapped = ::CreateEvent(0,true,false,0);
if (m_hevtOverlapped == 0)
{
// Obtain the error information
m_lLastError = ::GetLastError();
qDebug() << ("CSerial::Open - Unable to create event\n");
// Close the port
CloseHandle(m_hFile);
m_hFile = 0;
// Return the error
//return m_lLastError;
return false;
}
}
#else
// Overlapped flag shouldn't be specified
//_ASSERTE(!fOverlapped);
#endif
// Setup the COM-port
if (dwInQueue || dwOutQueue)
{
// Make sure the queue-sizes are reasonable sized. Win9X systems crash
// if the input queue-size is zero. Both queues need to be at least
// 16 bytes large.
//_ASSERTE(dwInQueue >= 16);
//_ASSERTE(dwOutQueue >= 16);
if (!SetupComm(m_hFile,dwInQueue,dwOutQueue))
{
// Display a warning
long lLastError = ::GetLastError();
qDebug() << ("CSerial::Open - Unable to setup the COM-port\n");
// Close the port
close();
// Save last error from SetupComm
m_lLastError = lLastError;
//return m_lLastError;
return false;
}
}
// Setup the default communication mask
SetMask();
// Non-blocking reads is default
SetupReadTimeouts(EReadTimeoutNonblocking);
//
// // Setup the device for default settings
// COMMCONFIG commConfig = {0};
// DWORD dwSize = sizeof(commConfig);
// commConfig.dwSize = dwSize;
// if (GetDefaultCommConfig(lpszDevice,&commConfig,&dwSize))
// {
// // Set the default communication configuration
// if (!SetCommConfig(m_hFile,&commConfig,dwSize))
// {
// // Display a warning
// qDebug() << ("CSerial::Open - Unable to set default communication configuration.\n");
// }
// }
// else
// {
// // Display a warning
// qDebug() << ("CSerial::Open - Unable to obtain default communication configuration.\n");
// }
// Return successful
//return m_lLastError;
return true;
}
LONG CSerial::Open (LPCTSTR lpszDevice, DWORD dwInQueue, DWORD dwOutQueue, bool fOverlapped)
{
// Reset error state
m_lLastError = ERROR_SUCCESS;
// Check if the port isn't already opened
if (m_hFile)
{
m_lLastError = ERROR_ALREADY_INITIALIZED;
_RPTF0(_CRT_WARN,"CSerial::Open - Port already opened\n");
return m_lLastError;
}
// Open the device
m_hFile = ::CreateFile(lpszDevice,
GENERIC_READ|GENERIC_WRITE,
0,
0,
OPEN_EXISTING,
fOverlapped?FILE_FLAG_OVERLAPPED:0,
0);
if (m_hFile == INVALID_HANDLE_VALUE)
{
// Reset file handle
m_hFile = 0;
// Display error
m_lLastError = ::GetLastError();
_RPTF0(_CRT_WARN, "CSerial::Open - Unable to open port\n");
return m_lLastError;
}
#ifndef SERIAL_NO_OVERLAPPED
// We cannot have an event handle yet
_ASSERTE(m_hevtOverlapped == 0);
// Create the event handle for internal overlapped operations (manual reset)
if (fOverlapped)
{
m_hevtOverlapped = ::CreateEvent(0,true,false,0);
if (m_hevtOverlapped == 0)
{
// Obtain the error information
m_lLastError = ::GetLastError();
_RPTF0(_CRT_WARN,"CSerial::Open - Unable to create event\n");
// Close the port
::CloseHandle(m_hFile);
m_hFile = 0;
// Return the error
return m_lLastError;
}
}
#else
// Overlapped flag shouldn't be specified
_ASSERTE(!fOverlapped);
#endif
// Setup the COM-port
if (dwInQueue || dwOutQueue)
{
// Make sure the queue-sizes are reasonable sized. Win9X systems crash
// if the input queue-size is zero. Both queues need to be at least
// 16 bytes large.
_ASSERTE(dwInQueue >= 16);
_ASSERTE(dwOutQueue >= 16);
if (!::SetupComm(m_hFile,dwInQueue,dwOutQueue))
{
// Display a warning
long lLastError = ::GetLastError();
_RPTF0(_CRT_WARN,"CSerial::Open - Unable to setup the COM-port\n");
// Close the port
Close();
// Save last error from SetupComm
m_lLastError = lLastError;
return m_lLastError;
}
}
// Setup the default communication mask
SetMask();
// Non-blocking reads is default
SetupReadTimeouts(EReadTimeoutNonblocking);
// Setup the device for default settings
COMMCONFIG commConfig = {0};
DWORD dwSize = sizeof(commConfig);
commConfig.dwSize = dwSize;
if (::GetDefaultCommConfig(lpszDevice,&commConfig,&dwSize))
{
// Set the default communication configuration
if (!::SetCommConfig(m_hFile,&commConfig,dwSize))
{
// Display a warning
_RPTF0(_CRT_WARN,"CSerial::Open - Unable to set default communication configuration.\n");
}
}
else
{
// Display a warning
_RPTF0(_CRT_WARN,"CSerial::Open - Unable to obtain default communication configuration.\n");
}
// Return successful
return m_lLastError;
}
LONG CNTSerial::Open (LPCTSTR lpszDevice, DWORD dwInQueue, DWORD dwOutQueue)
{
// Reset error state
m_lLastError = ERROR_SUCCESS;
// Check if the port isn't already opened
if (m_hFile)
{
m_lLastError = ERROR_ALREADY_INITIALIZED;
_RPTF0(_CRT_WARN,"CNTSerial::Open - Port already opened\n");
return m_lLastError;
}
// Open the device
m_hFile = ::CreateFile(lpszDevice,
GENERIC_READ|GENERIC_WRITE,
0,
0,
OPEN_EXISTING,
FILE_FLAG_OVERLAPPED,
0);
if (m_hFile == INVALID_HANDLE_VALUE)
{
// Reset file handle
m_hFile = 0;
// Display error
m_lLastError = ::GetLastError();
_RPTF0(_CRT_WARN, "CNTSerial::Open - Unable to open port\n");
return m_lLastError;
}
// We cannot have an event handle yet
_ASSERTE(m_hevtOverlapped == 0);
// Create the event handle for internal overlapped operations (manual reset)
m_hevtOverlapped = ::CreateEvent(0,true,false,0);
if (m_hevtOverlapped == 0)
{
// Obtain the error information
m_lLastError = ::GetLastError();
_RPTF0(_CRT_WARN,"CNTSerial::Open - Unable to create event\n");
// Close the port
::CloseHandle(m_hFile);
m_hFile = 0;
// Return the error
return m_lLastError;
}
// Setup the COM-port
if (!::SetupComm(m_hFile,dwInQueue,dwOutQueue))
{
// Display a warning
long lLastError = ::GetLastError();
_RPTF0(_CRT_WARN,"CNTSerial::Open - Unable to setup the COM-port\n");
// Close the port
ClosePort();
// Save last error from SetupComm
m_lLastError = lLastError;
return m_lLastError;
}
// Setup the default communication mask
SetMask();
// Setup the device for default settings
Setup();
// Non-blocking reads is default
SetupReadTimeouts(EReadTimeoutNonblocking);
// Default is no handshaking
SetupHandshaking(EHandshakeOff);
// Return successful
return m_lLastError;
}
