CString Extensions for Resource Loading and String Formatting

Friday May 12th 2000 by Joshua Reed
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The following classes were developed to simplify my life and clean up my code and perhaps they can do the same for you. They are simple classes, but allow an easy load of a string resource (important for internationalization) as well as an easy way to format strings.

Class Definitions

<font color=green>// Load resource</font>
class CResString : public CString
{
public:	
 CResString(): CString() {}; 
	 
 CResString(UINT nResID) 
 { 
  Init();
  VERIFY(LoadString(nResID) != 0);
  _ASSERTE( m_pchData );
 };

 void operator () (UINT nResID)
 {
  Init();
  VERIFY(LoadString(nResID) != 0);
  _ASSERTE( m_pchData );
 }
};

<font color=green>// Format </font>
class CFmtString : public CString
{
public:	
 CFmtString(): CString() {}; 

 CFmtString( char *szFormat, ... ) 
 { 
  Init();
  va_list argList;
  va_start( argList, szFormat );
  FormatV( szFormat, argList );
 };

 CFmtString( UINT uResID, ... ) 
 { 
  Init();
  va_list argList;
  CResString sFormat( uResID );
  va_start( argList, sFormat );
  FormatV( sFormat, argList );
 };

 void operator () ( char *szFormat, ... )
 {
  Init();
  va_list argList;
  va_start( argList, szFormat );
  FormatV( szFormat, argList );
 }

 void operator () ( UINT uResID, ... )
 {
  Init();
  va_list argList;
  CResString sFormat( uResID );
  va_start( argList, sFormat );
  FormatV( sFormat, argList );
 }
};

Examples of Using the CResString Class

CResString sSection(IDS_DATAOBJECTSECTION);
	
<font color=green>// Use sSection</font>

<font color=green>// ...</font>

<font color=green>// Load another string</font>

sSection(IDS_INVALIDOBJECT);

Example of Using the CFmtString Class

CFmtString sCommand(_T("SELECT %s FROM %s WHERE %s = %d"),
                    sColumn1, sTable, sColumn2, nID );
	
<font color=green>// Use sQuery</font>

<font color=green>// ...</font>

<font color=green>// Format another</font>
	
sCommand(_T("UPDATE %s SET %s = %d WHERE %s = %d"),  
         sTable, sColumn1, nValue, sColumn2, nID );

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