常用字元串函數
1. 字元串比較函數
//比較兩個字元串是否相同 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. 計算字元串長度 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. 字元串指派函數 HRESULT StringCchCopy(LPTSTR pszDest ,size_t cchDest ,LPCTSTR pszSrc ); //replacement for strcpy
HRESULT StringCchCopyN( LPTSTRpszDest
, size_tcchDest
, LPCTSTRpszSrc
, size_tcchSrc ); //replacement for strncpy LPTSTR StrCpy(LPTSTR psz1 ,LPCTSTR psz2 ); //存在安全問題 LPTSTR StrCpyN(LPTSTR psz1 ,LPCTSTR psz2 ,int cchMax ); //存在安全問題 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. 字元串連接配接函數 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 ); //存在安全問題 LPTSTR StrNCat( LPTSTR pszFront ,LPCTSTR pszBack ,int cchMax ); //存在安全問題
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. 字元查找函數 //查找字元串中指定字元第一次出現的位置 LPTSTR StrChr( LPCTSTR lpStart ,TCHAR wMatch ); //區分大小寫 char *strchr( const char * string, int c );
wchar_t * wcschr( const wchar_t * string, wchar_t c ); LPTSTR StrChrI( LPCTSTR lpStart ,TCHAR wMatch ); //不區分大小寫 //查找字元串中指定字元最後一次出現的位置 LPTSTR StrRChr( LPCTSTR lpStart ,LPCTSTR lpEnd ,TCHAR wMatch ); //區分大小寫
char *strrchr( const char* string
, intc
); wchar *wcsrchr( const wchar_t* string,
intc
);LPTSTR StrRChrI( LPCTSTR lpStart ,LPCTSTR lpEnd ,TCHAR wMatch ); //不區分大小寫 *注 StrRChr()函數可以通過StrChr()函數和while循環來實作。 補充: 查找字元串:
_tcsstr(........)字元串轉化為double型數字
_tcstod( const char *nptr, char **endptr )
字元串轉化為double型整數(隻取整數部分,不取小數)Convert strings to a long-integer value.
_tcstoul ( const char *nptr, char **endptr, int base )
_tcstol ( const char *nptr, char **endptr, int base )
取子字元串
Extracts a substring of length nCount characters from this
CStringTobject, starting at position iFirst (zero-based).
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