CFile

CFile is a C++ class that is provided to simplify 825 file operations. CFile is a wrapper class around the standard C library FILE object. CFile also provides some useful features such as baud rate setting for the 825 serial ports.

Constructors

CFile(void);
CFile(const string& strFilename);
CFile(const char* pszfilename);

These constructors just create a CFile object without opening a file.

CFile(const string& strFilename, const string& strMode);
CFile(const string& strFilename, const char* pszMode);
CFile(const char* pszFilename, const string& strMode);
CFile(const char* pszFilename, const char* pszMode);

These constructors construct the file object and attempt to open the file.

Parameters

• strFilename - filename
• pszFilename - filename
• strMode - mode
• pszMode - mode

Examples

CFile fileLog("/mnt/fl1/log.txt", "a");
if(fileLog.IsOpen())
{
     fileLog.Print("Gross %s Tare %s Net %s\r\n", FormatGrossWt(1).c_str(), FormatTareWt(1).c_str(), FormatNetWt(1).c_str()); 
     fileLog.Close();
}

CFile fileLog("/mnt/fl1/log.txt");

This contructs the object to open later.

Member Functions

Open

Opens a specified file, or using the filename already stored in the object.

bool Open(const string& strFilename, const string& strMode);
bool Open(const string& strFilename, const char* pszMode);
bool Open(const char* pszFilename, const string& strMode);
bool Open(const char* pszFilename, const char* pszMode);
bool Open(const char* pszMode);

Parameters

• strFilename - filename
• pszFilename - filename
• strMode - mode
• pszMode - mode

Return Value

Returns true if successful or false if unsuccessful.

Remarks

Example

CFile file;
if(file.Open("/tmp/tmpfile", "w") == false)
{
    DisplayText(0, 0, "Error writing temporary file");
}

Close

Closes the file

void Close(void);

Parameters

Function does not accept any parameters

Retrun Value

Function does not return any result.

Remarks

For serial ports it may be necessary to provide some delay to allow all of the buffered data to be sent out of the port before closing the port.

Example

CFile file("/dev/ttyS1", "w");
file.Print("This is a test\r\n");
SleepSeconds(1);
file.Close();

SetSerial

Set the baud rate, number of data bits, parity, and number of stop bits for serial ports.

bool SetSerial(baud_index baud, data_bit_index = data8, parity_index = parityNone, stop_bit_index = stopOne);

Parameters

• baud_index
• data_bit_index
• parity_index
• stop_bit_index

Return Value

Returns true if successful, false if not successful.

Remarks

Examples

CFile file("/dev/ttyS1", "w");
if(file.IsOpen())
{
   file.SetSerial(CFile::baud9600, CFile::data7, CFile::parityEven, CFile::stopOne);
}

CFile file("/dev/ttyS1", "w");
if(file.IsOpen())
{
   file.SetSerial(CFile::baud19200);
}

ReadLine

Reads a text file a line at a time.

bool ReadLine(std::string& strLine);

Parameters

• strLine - string reference to return line read

Return Value

Returns true if line read, false if end of file

Remarks

Example

CFile file("/mnt/nand/apps/test/config.txt", "r");
if(file.IsOpen())
{
   string strLine;
   while(file.ReadLine(strLine) == true)
   {
       if(strLine.substr(0, 7) == "Setting")
       {
           // TODO Parse the settings line
       }
   }
   file.Close();
}

=== DeleteFile ===

{{{
static bool DeleteFile(std::string& filepath);
static bool DeleteFile(const char* filepath);

bool DeleteFile(void);
}}}


=== IsReady ===
Check the state of the serial CTS input
{{{
bool IsReady(void);
}}}
==== Parameters ==== 

Function does not accept any parameters.

==== Return Value ====

Function returns true if CTS is active, false if CTS is inactive.

==== Remarks ====

IsReady() will return false if the CTS line is unconnected. Printers or other devices must be wired correctly for applications to be able to use this function to determine their readiness.

==== Example ====

{{{
CFile fileLogOutput("/dev/ttyS1", "w");
if(fileLogOutput.IsOpen())
{
   fileLogOutput.SetRTS(true);
   if(fileLogOutput.IsReady() == false)
   {
      DisplayText(0, 0, "Printer offline, or disconnected");
   }
}
}}}


=== SetRTS ===
Set the state of the serial RTS output

{{{
bool SetRTS(bool bRTSOn = true);
}}}

==== Parameters ==== 

 * bRTSOn - true to turn on RTS output, false to turn off RTS output

==== Return Value ====

Returns true if successfully set RTS state, false otherwise.

==== Remarks ====

==== Example ====

{{{
CFile fileLogOutput("/dev/ttyS1", "w");
fileLogOutput.SetRTS(true);
}}}



=== GetFile ===

{{{
FILE* GetFile(void);
}}}

=== Print ===

{{{
void Print(const std::string& fmt, ...);
void Print(const char * fmt, va_list& args);
void Print(const std::string& fmt, va_list& args);
void Print(const char * fmt, va_list& args);
}}}

=== SetNonBlocking ===

{{{
void SetNonBlocking(void);
}}}


=== Read ===

{{{
bool Read(void * ptr, size_t size);
}}}

=== Write ===

{{{
bool Write(void * buf, size_t size);
}}}

=== GetBytesRead ===

{{{
size_t GetBytesRead(void);
}}}

=== GetbytesWritten ===

{{{
size_t GetBytesWritten(void);
}}}

=== Seek ===

{{{
bool Seek(long int offset, long int origin = SEEK_SET);
}}}