Re: Class Usage
Michael R. Copeland wrote:
I have defined the following class:
//-----------------------------------------------------------------
class LogFunctions // Log/Audit File class
{
public:
LogFunctions::LogFunctions(char *fileName); // constructor
Should be
LogFunctions(char const*);
LogFunctions::~LogFunctions(); // destructor
Should be
~LogFunctions();
If you don't see it yet, there is no need to prepend the names of the
member function declarations with the class name and '::' _inside_ the
class definition.
void LogFunctions::openLog(char *fileName); // open Log file
Again, a pointer to _const_ char.
void LogFunctions::putLog(char *line); // write->Log/Audit file
Again, a pointer to _const_ char.
void LogFunctions::scanLog(); // scan Log/Audit file
What does it mean to "scan" it?
void LogFunctions::closeLog(); // close current log/audit file
static int listFile(char *fileName); // lists named file
Again, a pointer to _const_ char.
private:
static void cursor(char row, char col);
static void initScr(void);
If there are no arguments, it's better to have empty parentheses, as
in
static void initScr();
static char *fileReadRecord(long);
static void parseStr(char *str); // parse string from file buffer
Again, a pointer to _const_ char.
typedef unsigned long ULONG;
I suppose there is some use for this...
};
//-----------------------------------------------------------------
and I am having difficulty using this class as an object pointer. I
need to use it several times (with different files) throughout the
execution of my application. That is, I want to have several files
concurrently opened, writing, being scanned, etc. within the same
program. Thus, I thought would do the following:
//-----------------------------------------------------------------
LogFunctions *l_c = NULL;
Why do youi need to declare it here? And *where* is that?
...
LogFunctions *l_c = new LogFunctions("testfile.log");
You seem to be declaring *another* object with the name 'l_c' here.
Do you really need two of them?
...
l_c->putLog("Some textual data");
l_c->scanLog();
etc.
...
l_c->closeLog();
delete(l_c);
Parentheses? Why?
//-----------------------------------------------------------------
This sort of code generates all sorts of compile errors (which don't
help me understand what I did wrong), and I know I've badly confused
the concepts of class definition and instantiation...8<}}
*What* sorts of compile errors? I cannot get them since the code you
posted is not real -- it's an exerpt.
So, if my explanation of my intent makes sense, I'd appreciate some
guidance as to how actually implement this logic... TIA
Have you tried looking on the web? If you haven't, do, and look for
'log4cpp' project. There is no need to reinvent the wheel. Just find
what you need and use it.
V
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