VC++中字符串比较和查
常用字符串函数   
1. 字符串比较函数   
//比较两个字符串是否相同   
int StrCmp(LPCTSTR lpStr1,LPCTSTR lpStr2);   
int StrCmpN(LPCTSTR lpStr1,LPCTSTR lpStr2,int nChar);   
int strcmp( const char *string1, const char *string2 );   
int wcscmp( const wchar_t *string1, const wchar_t *string2 );   
int CompareString(LCID Locale, DWORD dwCmpFlags, LPCTSTR lpString1, int cchCount1, LPCTSTR lpString2, int cchCount2);   
2. 计算字符串长度   
HRESULT StringCchLength( LPCTSTR psz,size_t cchMax,size_t *pcch); //replacement for strlen   
size_t strlen( const char *string );   
size_t wcslen( const wchar_t *string );   
3. 字符串赋值函数   
HRESULT StringCchCopy(LPTSTR pszDest,size_t cchDest,LPCTSTR pszSrc); //replacement for strcpy   
HRESULT StringCchCopyN(LPTSTR pszDest,size_t cchDest,LPCTSTR pszSrc,size_t cchSrc); //replacement for strncpy   
LPTSTR StrCpy(LPTSTR psz1,LPCTSTR psz2); //存在安全问题   
LPTSTR StrCpyN(LPTSTR psz1,LPCTSTR psz2,int cchMax); //存在安全问题   
char *strcpy( char *strDestination, const char *strSource );   
wchar_t *wcscpy( wchar_t *strDestination, const wchar_t *strSource );   
char *strncpy( char *strDest, const char *strSource, size_t count );   
wchar_t *wcsncpy( wchar_t*strDest, const wchar_t *strSource, size_t count );   
4. 字符串连接函数   
HRESULT StringCchCat( LPTSTR pszDest,size_t cchDest,LPCTSTR pszSrc); //replacement for strcat   
HRESULT StringCchCatN( LPTSTR pszDest,size_t cchDest,LPCTSTR pszSrc,size_t cchMaxAppend); //replacement for strncat   
LPTSTR StrCat( LPTSTR psz1,LPCTSTR psz2); //存在安全问题   
LPTSTR StrNCat( LPTSTR pszFront,LPCTSTR pszBack,int cchMax); //存在安全问题   
char *strcat( char *strDestination, const char *strSource );   
wchar_t *wcscat( wchar_t *strDestination, const wchar_t *strSource );   
char *strncat( char *strDest, const char *strSource, size_t count );   
wchar_t *wcsncat( wchar_t *strDest, const wchar_t *strSource, size_t count );   
5. 字符查函数   
//查字符串中指定字符第一次出现的位置   
LPTSTR StrChr( LPCTSTR lpStart,TCHAR wMatch); //区分大小写   
char *strchr( const char *string, int c );   
wchar_t *wcschr( const wchar_t *string, wchar_t c );   
LPTSTR StrChrI( LPCTSTR lpStart,TCHAR wMatch); //不区分大小写   
//查字符串中指定字符最后一次出现的位置   
LPTSTR StrRChr( LPCTSTR lpStart,LPCTSTR lpEnd,TCHAR wMatch); //区分大小写   
char *strrchr( const char*string, int c );   
wchar *wcsrchr( const wchar_t *string, int c );   
LPTSTR StrRChrI( LPCTSTR lpStart,LPCTSTR lpEnd,TCHAR wMatch); //不区分大小写   
*注 StrRChr()函数可以通过StrChr()函数和while循环来实现。   
补充:   
查字符串:   
_tcsstr(........)   
字符串转化为double型数字   
_tcstod( const char *nptr, char **endptr )   
字符串转化为double型整数(只取整数部分,不取小数)Convert strings to a long-integer value.   
_tcstoul ( const char *nptr, char **endptr, int base )   
_tcstol ( const char *nptr, char **endptr, int base )   
取子字符串   
strcmp可以比较单个字符吗
Extracts a substring of length nCount characters from this CStringT object, starting at position iFirst (zero-based).   
CStringT Mid(   
int iFirst,   
int nCount   
) const;   
CStringT Mid(   
int iFirst   
) const;   
example:   
//typedef CStringT < TCHAR, StrTraitATL < TCHAR > > CAtlString;   
CAtlString s( _T("abcdef") );   
_ASSERT( s.Mid( 2, 3 ) == _T("cde") );

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