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Tricks of the Windows Gam…ming Gurus (2nd Edition)
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Disc2.iso
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vc98
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mfc
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src
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winstr.cpp
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C/C++ Source or Header
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1998-06-16
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// This is a part of the Microsoft Foundation Classes C++ library.
// Copyright (C) 1992-1998 Microsoft Corporation
// All rights reserved.
//
// This source code is only intended as a supplement to the
// Microsoft Foundation Classes Reference and related
// electronic documentation provided with the library.
// See these sources for detailed information regarding the
// Microsoft Foundation Classes product.
#include "stdafx.h"
#ifdef AFX_CORE1_SEG
#pragma code_seg(AFX_CORE1_SEG)
#endif
#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
/////////////////////////////////////////////////////////////////////////////
// Windows extensions to strings
#ifdef _UNICODE
#define CHAR_FUDGE 1 // one TCHAR unused is good enough
#else
#define CHAR_FUDGE 2 // two BYTES unused for case of DBC last char
#endif
BOOL CString::LoadString(UINT nID)
{
// try fixed buffer first (to avoid wasting space in the heap)
TCHAR szTemp[256];
int nLen = AfxLoadString(nID, szTemp, _countof(szTemp));
if (_countof(szTemp) - nLen > CHAR_FUDGE)
{
*this = szTemp;
return nLen > 0;
}
// try buffer size of 512, then larger size until entire string is retrieved
int nSize = 256;
do
{
nSize += 256;
nLen = AfxLoadString(nID, GetBuffer(nSize-1), nSize);
} while (nSize - nLen <= CHAR_FUDGE);
ReleaseBuffer();
return nLen > 0;
}
#ifndef _AFXDLL
int AFXAPI AfxLoadString(UINT nID, LPTSTR lpszBuf, UINT nMaxBuf)
{
ASSERT(AfxIsValidAddress(lpszBuf, nMaxBuf*sizeof(TCHAR)));
#ifdef _DEBUG
// LoadString without annoying warning from the Debug kernel if the
// segment containing the string is not present
if (::FindResource(AfxGetResourceHandle(),
MAKEINTRESOURCE((nID>>4)+1), RT_STRING) == NULL)
{
lpszBuf[0] = '\0';
return 0; // not found
}
#endif //_DEBUG
int nLen = ::LoadString(AfxGetResourceHandle(), nID, lpszBuf, nMaxBuf);
if (nLen == 0)
lpszBuf[0] = '\0';
return nLen;
}
#endif
/////////////////////////////////////////////////////////////////////////////
BOOL AFXAPI AfxExtractSubString(CString& rString, LPCTSTR lpszFullString,
int iSubString, TCHAR chSep)
{
if (lpszFullString == NULL)
return FALSE;
while (iSubString--)
{
lpszFullString = _tcschr(lpszFullString, chSep);
if (lpszFullString == NULL)
{
rString.Empty(); // return empty string as well
return FALSE;
}
lpszFullString++; // point past the separator
}
LPCTSTR lpchEnd = _tcschr(lpszFullString, chSep);
int nLen = (lpchEnd == NULL) ?
lstrlen(lpszFullString) : (int)(lpchEnd - lpszFullString);
ASSERT(nLen >= 0);
memcpy(rString.GetBufferSetLength(nLen), lpszFullString, nLen*sizeof(TCHAR));
return TRUE;
}
/////////////////////////////////////////////////////////////////////////////