Re: Newbie: out of memory issues

"Giovanni Dicanio" <gdicanio@_NOSPAM_email_DOT_it>
Thu, 21 Aug 2008 17:40:23 +0200
<> ha scritto nel messaggio

Yes ,

Heres the problem code:: Lots of array handling with objects..
I'm sure there's a better way to init arrays of strings(below).

OK Tony.

First thing: please get rid of raw C char*/TCHAR* strings, and use a robust
string class (like CString or std::wstring).
And please use an array container class like std::vector or CArray, not raw
C array.

I believe that most of the problems and bugs in today C++ code are caused by
the fact that some programmers use C++ as a "renamed C" (i.e. they use only
1% of C++), instead of correctly using robust tools that C++ offers, like
container classes, string classes, RAII, etc. that make the programmer's
life easier.

int CMyFx::Calc_Charts_And_Houses(CChart Chart1,int intCht)

Maybe you should pass CChar as a const reference (const &) here, to avoid
copy constructors calls and deep-copy.

 ...Calc_Charts_And_Houses( const CChart & Chart1, int intCht )

(Note that VB.NET passes class instances using references [i.e. kind of
pointers] "under the scene"; instead, in C++, you must make that reference
passing explicit.)

double X[6] = {0,0,0,0,0,0};
double Y[6] = {0,0,0,0,0,0};
double cusp[13];
double ascmc[10];
int cal = 103;
string ss(16,' ');
char out1[31];
char out2[31];
char out3[31];

I would really use some array container, like std::vector, e.g.

  std::vector< double > X( 6 );
  std::vector< double > cusp( 13 );

If your char arrays are strings, use a string class:

  CString out1;
  CString out2;
  CString out3;

Using array and string classes help you avoid dangerous buffer overruns
(security enemy #1), and memory leaks (because these classes have
destructors that do proper cleanup of resources).

char* strErr;
//CString strErr;
char* strPlname;
strErr = new char[256];

strPlname = new char[21];

Just use CString/std::wstring:

  CString strErr;
  CString strPIname;

  strErr = _T("... some error..." );

Or better load error string from resources, e.g. strErr.LoadString(

strPlname = TrimRight(strPlname, ' ');

CString class has methods for trimming, that are better than using an
external function.

N2Planets[intX].dbDeclination = Y[1];


If you use a CString class, you don't need dangerous strcpy (which -
moreover - is not correct for Unicode).

  CString strPIname;
  CString out1 = strPIname; // no strcpy; safe; Unicode-ready


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