c++自定义实现读取ini文件

//头文件

#ifndef CIniParse_H
#define CIniParse_H

//#include "stdafx.h"

// C++ Includes
#include 
#include 

// C Includes
#include 

using namespace std;

#define MAX_KEYNAME    128
#define MAX_VALUENAME  128
#define MAX_VALUEDATA 2048

struct key {
    string sectionName;
	vector names;
    vector values;
    vector comments;
  };

class CIniParse
{
public:
  bool   caseInsensitive;
  string path;

  vector    keys;
  vector names;
  vector comments;
  string CheckCase( string s) const;

public:
  enum errors{ noID = -1};
  CIniParse( string const iniPath = "");
  virtual ~CIniParse()                            {}

  // Sets whether or not keynames and valuenames should be case sensitive.
  // The default is case insensitive.
  void CaseSensitive()                           {caseInsensitive = false;}
  void CaseInsensitive()                         {caseInsensitive = true;}

  // Sets path of ini file to read and write from.
  void Path(string const newPath)                {path = newPath;}
  string Path() const                            {return path;}
  void SetPath(string const newPath)             {Path( newPath);}

  // Reads ini file specified using path.
  // Returns true if successful, false otherwise.
  bool ReadFile();

  // Writes data stored in class to ini file.
  bool WriteFile();

  // Deletes all stored ini data.
  void Erase();
  void Clear()                                   {Erase();}
  void Reset()                                   {Erase();}

  // Returns index of specified key, or noID if not found.
  long FindKey( string const keyname) const;

  // Returns index of specified value, in the specified key, or noID if not found.
  long FindValue( unsigned const keyID, string const valuename) const;

  // Returns number of keys currently in the ini.
  unsigned NumKeys() const                       {return (unsigned)names.size();}
  unsigned GetNumKeys() const                    {return NumKeys();}

  // Add a key name.
  unsigned AddKeyName( string const keyname);

  // Returns key names by index.
  string KeyName( unsigned const keyID) const;
  string GetKeyName( unsigned const keyID) const {return KeyName(keyID);}

  // Returns number of values stored for specified key.
  unsigned NumValues( unsigned const keyID);
  unsigned GetNumValues( unsigned const keyID)   {return NumValues( keyID);}
  unsigned NumValues( string const keyname);
  unsigned GetNumValues( string const keyname)   {return NumValues( keyname);}

  // Returns value name by index for a given keyname or keyID.
  string ValueName( unsigned const keyID, unsigned const valueID) const;
  string GetValueName( unsigned const keyID, unsigned const valueID) const {
    return ValueName( keyID, valueID);
  }
  string ValueName( string const keyname, unsigned const valueID) const;
  string GetValueName( string const keyname, unsigned const valueID) const {
    return ValueName( keyname, valueID);
  }

  // Gets value of [keyname] valuename =.
  // Overloaded to return string, int, and double.
  // Returns defValue if key/value not found.
  string GetValue( unsigned const keyID, unsigned const valueID, string const defValue = "") const;
  string GetValue(string const keyname, string const valuename, string const defValue = "") const;
  int    GetValueI(string const keyname, string const valuename, int const defValue = 0) const;
  bool   GetValueB(string const keyname, string const valuename, bool const defValue = false) const {
      int nDefValue = defValue == true ? 1 : 0;
      bool nRet = GetValueI( keyname, valuename, nDefValue ) == 1 ? true : false;
      return nRet;
  }
  double   GetValueF(string const keyname, string const valuename, double const defValue = 0.0) const;
  // This is a variable length formatted GetValue routine. All these voids
  // are required because there is no vsscanf() like there is a vsprintf().
  // Only a maximum of 8 variable can be read.
  unsigned GetValueV( string const keyname, string const valuename, char *format,
              void *v1 = 0, void *v2 = 0, void *v3 = 0, void *v4 = 0,
                void *v5 = 0, void *v6 = 0, void *v7 = 0, void *v8 = 0,
                void *v9 = 0, void *v10 = 0, void *v11 = 0, void *v12 = 0,
                void *v13 = 0, void *v14 = 0, void *v15 = 0, void *v16 = 0);

  // Sets value of [keyname] valuename =.
  // Specify the optional paramter as false (0) if you do not want it to create
  // the key if it doesn't exist. Returns true if data entered, false otherwise.
  // Overloaded to accept string, int, and double.
  bool SetValue( unsigned const keyID, unsigned const valueID, string const value);
  bool SetValue( string const keyname, string const valuename, string const value, bool const create = true);
  bool SetValueI( string const keyname, string const valuename, int const value, bool const create = true);
  bool SetValueB( string const keyname, string const valuename, bool const value, bool const create = true) {
    return SetValueI( keyname, valuename, int(value), create);
  }
  bool SetValueF( string const keyname, string const valuename, double const value, bool const create = true);
  bool SetValueV( string const keyname, string const valuename, char *format, ...);

  // Deletes specified value.
  // Returns true if value existed and deleted, false otherwise.
  bool DeleteValue( string const keyname, string const valuename);

  // Deletes specified key and all values contained within.
  // Returns true if key existed and deleted, false otherwise.
  bool DeleteKey(string keyname);

  // Header comment functions.
  // Header comments are those comments before the first key.
  //
  // Number of header comments.
  unsigned NumHeaderComments()                  {return (unsigned)comments.size();}
  // Add a header comment.
  void     HeaderComment( string const comment);
  // Return a header comment.
  string   HeaderComment( unsigned const commentID) const;
  // Delete a header comment.
  bool     DeleteHeaderComment( unsigned commentID);
  // Delete all header comments.
  void     DeleteHeaderComments()               {comments.clear();}

  // Key comment functions.
  // Key comments are those comments within a key. Any comments
  // defined within value names will be added to this list. Therefore,
  // these comments will be moved to the top of the key definition when
  // the CIniParse::WriteFile() is called.
  //
  // Number of key comments.
  unsigned NumKeyComments( unsigned const keyID) const;
  unsigned NumKeyComments( string const keyname) const;
  // Add a key comment.
  bool     KeyComment( unsigned const keyID, string const comment);
  bool     KeyComment( string const keyname, string const comment);
  // Return a key comment.
  string   KeyComment( unsigned const keyID, unsigned const commentID) const;
  string   KeyComment( string const keyname, unsigned const commentID) const;
  // Delete a key comment.
  bool     DeleteKeyComment( unsigned const keyID, unsigned const commentID);
  bool     DeleteKeyComment( string const keyname, unsigned const commentID);
  // Delete all comments for a key.
  bool     DeleteKeyComments( unsigned const keyID);
  bool     DeleteKeyComments( string const keyname);
};

#endif

实现文件

#include "IniParse.h"

// C++ Includes
#include 
#include 
//#include 
#include 

// C Includes
#include 
#include 
#include 

#if defined(WIN32)
#define iniEOL endl
#else
#define iniEOL '\r' << endl
#endif

CIniParse::CIniParse( string const iniPath)
{
  Path( iniPath );
  caseInsensitive = true;
}

bool CIniParse::ReadFile()
{
  // Normally you would use ifstream, but the SGI CC compiler has
  // a few bugs with ifstream. So ... fstream used.
  fstream f;
  string   line;
  string   keyname, valuename, value;
  string::size_type pLeft, pRight;
  f.open( path.c_str(), ios::in);
  if ( f.fail())
  {
	  return false;
  }
  while( getline( f, line)) {
    // To be compatible with Win32, check for existence of '\r'.
    // Win32 files have the '\r' and Unix files don't at the end of a line.
    // Note that the '\r' will be written to INI files from
    // Unix so that the created INI file can be read under Win32
    // without change.
    #if defined(WIN32)
    #else
	if ( line[line.length()==0?0:line.length()-1] == '\r'){
      line = line.substr( 0, line.length() - 1);
	}
	#endif
    if ( line.length()) {
      // Check that the user hasn't openned a binary file by checking the first
      // character of each line!
      if ( !isprint( line[0])) {
	printf( "Failing on char %d\n", line[0]);
	f.close();
	return false;
      }
      if (( pLeft = line.find_first_of(";#[=")) != string::npos) {
	switch ( line[pLeft]) {
	case '[':
	  if ((pRight = line.find_last_of("]")) != string::npos &&
	      pRight > pLeft) {
	    keyname = line.substr( pLeft + 1, pRight - pLeft - 1);
	    AddKeyName( keyname);
	  }
	  break;

	case '=':
	  valuename = line.substr( 0, pLeft);
	  value = line.substr( pLeft + 1);
	  SetValue( keyname, valuename, value);
	  break;

	case ';':
	case '#':
	  if ( !names.size())
	    HeaderComment( line.substr( pLeft + 1));
	  else
	    KeyComment( keyname, line.substr( pLeft + 1));
	  break;
	}
      }
    }
  }
  f.close();
  if ( names.size())
    return true;
  return false;
}

bool CIniParse::WriteFile()
{
  unsigned commentID, keyID, valueID;
  // Normally you would use ofstream, but the SGI CC compiler has
  // a few bugs with ofstream. So ... fstream used.
  fstream f;
  f.open( path.c_str(), ios::out);
  if ( f.fail())
  {
    return false;
  }

  // Write header comments.
  for ( commentID = 0; commentID < comments.size(); ++commentID)
    f << ';' << comments[commentID] << iniEOL;
  if ( comments.size())
    f << iniEOL;

  // Write keys and values.
  for ( keyID = 0; keyID < keys.size(); ++keyID) {
    f << '[' << names[keyID] << ']' << iniEOL;
    // Comments.
    for ( commentID = 0; commentID < keys[keyID].comments.size(); ++commentID)
      f << ';' << keys[keyID].comments[commentID] << iniEOL;
    // Values.
    for ( valueID = 0; valueID < keys[keyID].names.size(); ++valueID)
      f << keys[keyID].names[valueID] << '=' << keys[keyID].values[valueID] << iniEOL;
    f << iniEOL;
  }
  f.close();
  return true;
}

long CIniParse::FindKey( string const keyname) const
{
  for ( unsigned keyID = 0; keyID < names.size(); ++keyID)
    if ( CheckCase( names[keyID]) == CheckCase( keyname))
      return long(keyID);
  return noID;
}

long CIniParse::FindValue( unsigned const keyID, string const valuename) const
{
  if ( !keys.size() || keyID >= keys.size())
    return noID;

  for ( unsigned valueID = 0; valueID < keys[keyID].names.size(); ++valueID)
    if ( CheckCase( keys[keyID].names[valueID]) == CheckCase( valuename))
      return long(valueID);
  return noID;
}

unsigned CIniParse::AddKeyName( string const keyname)
{
  names.resize( names.size() + 1, keyname);
  keys.resize( keys.size() + 1);
  keys[keys.size()-1].sectionName=keyname;
  return (unsigned)names.size() - 1;
}

string CIniParse::KeyName( unsigned const keyID) const
{
  if ( keyID < names.size())
    return names[keyID];
  else
    return "";
}

unsigned CIniParse::NumValues( unsigned const keyID)
{
  if ( keyID < keys.size())
    return (unsigned)keys[keyID].names.size();
  return 0;
}

unsigned CIniParse::NumValues( string const keyname)
{
  long keyID = FindKey( keyname);
  if ( keyID == noID)
    return 0;
  return (unsigned)keys[keyID].names.size();
}

string CIniParse::ValueName( unsigned const keyID, unsigned const valueID) const
{
  if ( keyID < keys.size() && valueID < keys[keyID].names.size())
    return keys[keyID].names[valueID];
  return "";
}

string CIniParse::ValueName( string const keyname, unsigned const valueID) const
{
  long keyID = FindKey( keyname);
  if ( keyID == noID)
    return "";
  return ValueName( keyID, valueID);
}

bool CIniParse::SetValue( unsigned const keyID, unsigned const valueID, string const value)
{
  if ( keyID < keys.size() && valueID < keys[keyID].names.size())
    keys[keyID].values[valueID] = value;

  return false;
}

bool CIniParse::SetValue( string const keyname, string const valuename, string const value, bool const create)
{
  long keyID = FindKey( keyname);
  if ( keyID == noID) {
    if ( create)
      keyID = long( AddKeyName( keyname));
    else
      return false;
  }

  long valueID = FindValue( unsigned(keyID), valuename);
  if ( valueID == noID) {
    if ( !create)
      return false;
    keys[keyID].names.resize( keys[keyID].names.size() + 1, valuename);
    keys[keyID].values.resize( keys[keyID].values.size() + 1, value);
  } else
    keys[keyID].values[valueID] = value;

  return true;
}

bool CIniParse::SetValueI( string const keyname, string const valuename, int const value, bool const /*create*/)
{
  char svalue[MAX_VALUEDATA];

  sprintf( svalue, "%d", value);
  return SetValue( keyname, valuename, svalue);
}

bool CIniParse::SetValueF( string const keyname, string const valuename, double const value, bool const /*create*/)
{
  char svalue[MAX_VALUEDATA];

  sprintf( svalue, "%f", value);
  return SetValue( keyname, valuename, svalue);
}

bool CIniParse::SetValueV( string const keyname, string const valuename, char *format, ...)
{
  va_list args;
  char value[MAX_VALUEDATA];

  va_start( args, format);
  vsprintf( value, format, args);
  va_end( args);
  return SetValue( keyname, valuename, value);
}

string CIniParse::GetValue( unsigned const keyID, unsigned const valueID, string const defValue) const
{
  if ( keyID < keys.size() && valueID < keys[keyID].names.size())
    return keys[keyID].values[valueID];
  return defValue;
}

string CIniParse::GetValue( string const keyname, string const valuename, string const defValue) const
{
  long keyID = FindKey( keyname);
  if ( keyID == noID)
    return defValue;

  long valueID = FindValue( unsigned(keyID), valuename);
  if ( valueID == noID)
    return defValue;

  return keys[keyID].values[valueID];
}

int CIniParse::GetValueI(string const keyname, string const valuename, int const defValue) const
{
  char svalue[MAX_VALUEDATA];

  sprintf( svalue, "%d", defValue);
  return atoi( GetValue( keyname, valuename, svalue).c_str());
}

double CIniParse::GetValueF(string const keyname, string const valuename, double const defValue) const
{
  char svalue[MAX_VALUEDATA];

  sprintf( svalue, "%f", defValue);
  return atof( GetValue( keyname, valuename, svalue).c_str());
}

// 16 variables may be a bit of over kill, but hey, it's only code.
unsigned CIniParse::GetValueV( string const keyname, string const valuename, char *format,
			      void *v1, void *v2, void *v3, void *v4,
  			      void *v5, void *v6, void *v7, void *v8,
  			      void *v9, void *v10, void *v11, void *v12,
  			      void *v13, void *v14, void *v15, void *v16)
{
  string   value;
  // va_list  args;
  unsigned nVals;


  value = GetValue( keyname, valuename);
  if ( !value.length())
    return false;
  // Why is there not vsscanf() function. Linux man pages say that there is
  // but no compiler I've seen has it defined. Bummer!
  //
  // va_start( args, format);
  // nVals = vsscanf( value.c_str(), format, args);
  // va_end( args);

  nVals = sscanf( value.c_str(), format,
		  v1, v2, v3, v4, v5, v6, v7, v8,
		  v9, v10, v11, v12, v13, v14, v15, v16);

  return nVals;
}

bool CIniParse::DeleteValue( string const keyname, string const valuename)
{
  long keyID = FindKey( keyname);
  if ( keyID == noID)
    return false;

  long valueID = FindValue( unsigned(keyID), valuename);
  if ( valueID == noID)
    return false;

  // This looks strange, but is neccessary.
  vector::iterator npos = keys[keyID].names.begin() + valueID;
  vector::iterator vpos = keys[keyID].values.begin() + valueID;
  keys[keyID].names.erase( npos, npos + 1);
  keys[keyID].values.erase( vpos, vpos + 1);

  return true;
}

bool CIniParse::DeleteKey( string const keyname)
{
  long keyID = FindKey( keyname);
  if ( keyID == noID)
    return false;

  // Now hopefully this destroys the vector lists within keys.
  // Looking at  source, this should be the case using the destructor.
  // If not, I may have to do it explicitly. Memory leak check should tell.
  // memleak_test.cpp shows that the following not required.
  //keys[keyID].names.clear();
  //keys[keyID].values.clear();

  vector::iterator npos = names.begin() + keyID;
  vector::iterator    kpos = keys.begin() + keyID;
  names.erase( npos, npos + 1);
  keys.erase( kpos, kpos + 1);

  return true;
}

void CIniParse::Erase()
{
  // This loop not needed. The vector<> destructor seems to do
  // all the work itself. memleak_test.cpp shows this.
  //for ( unsigned i = 0; i < keys.size(); ++i) {
  //  keys[i].names.clear();
  //  keys[i].values.clear();
  //}
  names.clear();
  keys.clear();
  comments.clear();
}

void CIniParse::HeaderComment( string const comment)
{
  comments.resize( comments.size() + 1, comment);
}

string CIniParse::HeaderComment( unsigned const commentID) const
{
  if ( commentID < comments.size())
    return comments[commentID];
  return "";
}

bool CIniParse::DeleteHeaderComment( unsigned commentID)
{
  if ( commentID < comments.size()) {
    vector::iterator cpos = comments.begin() + commentID;
    comments.erase( cpos, cpos + 1);
    return true;
  }
  return false;
}

unsigned CIniParse::NumKeyComments( unsigned const keyID) const
{
  if ( keyID < keys.size())
    return (unsigned)keys[keyID].comments.size();
  return (unsigned) 0;
}

unsigned CIniParse::NumKeyComments( string const keyname) const
{
  long keyID = FindKey( keyname);
  if ( keyID == noID)
    return 0;
  return (unsigned)keys[keyID].comments.size();
}

bool CIniParse::KeyComment( unsigned const keyID, string const comment)
{
  if ( keyID < keys.size()) {
    keys[keyID].comments.resize( keys[keyID].comments.size() + 1, comment);
    return true;
  }
  return false;
}

bool CIniParse::KeyComment( string const keyname, string const comment)
{
  long keyID = FindKey( keyname);
  if ( keyID == noID)
    return false;
  return KeyComment( unsigned(keyID), comment);
}

string CIniParse::KeyComment( unsigned const keyID, unsigned const commentID) const
{
  if ( keyID < keys.size() && commentID < keys[keyID].comments.size())
    return keys[keyID].comments[commentID];
  return "";
}

string CIniParse::KeyComment( string const keyname, unsigned const commentID) const
{
  long keyID = FindKey( keyname);
  if ( keyID == noID)
    return "";
  return KeyComment( unsigned(keyID), commentID);
}

bool CIniParse::DeleteKeyComment( unsigned const keyID, unsigned const commentID)
{
  if ( keyID < keys.size() && commentID < keys[keyID].comments.size()) {
    vector::iterator cpos = keys[keyID].comments.begin() + commentID;
    keys[keyID].comments.erase( cpos, cpos + 1);
    return true;
  }
  return false;
}

bool CIniParse::DeleteKeyComment( string const keyname, unsigned const commentID)
{
  long keyID = FindKey( keyname);
  if ( keyID == noID)
    return false;
  return DeleteKeyComment( unsigned(keyID), commentID);
}

bool CIniParse::DeleteKeyComments( unsigned const keyID)
{
  if ( keyID < keys.size()) {
    keys[keyID].comments.clear();
    return true;
  }
  return false;
}

bool CIniParse::DeleteKeyComments( string const keyname)
{
  long keyID = FindKey( keyname);
  if ( keyID == noID)
    return false;
  return DeleteKeyComments( unsigned(keyID));
}

string CIniParse::CheckCase( string s) const
{
  if ( caseInsensitive)
    for ( string::size_type i = 0; i < s.length(); ++i)
      s[i] = tolower(s[i]);
  return s;
}

以上实现参考与某些大牛写的库，但是找不到源地址，还是感谢原作者