VC++中字符串比較和查找

@IT小小鳥@ 2012-02-29

展開全文

常用字符串函數(shù)

1. 字符串比較函數(shù)

    //比較兩個字符串是否相同
    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. 計算字符串長度

        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. 字符串賦值函數(shù)

        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. 字符串連接函數(shù)

      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. 字符查找函數(shù)

        //查找字符串中指定字符第一次出現(xiàn)的位置
        LPTSTR StrChr( LPCTSTR lpStart,TCHAR wMatch); //區(qū)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(qū)分大小寫

      //查找字符串中指定字符最后一次出現(xiàn)的位置
      LPTSTR StrRChr( LPCTSTR lpStart,LPCTSTR lpEnd,TCHAR wMatch); //區(qū)分大小寫
      char *strrchr( const char*string, int c );
        wchar *wcsrchr( const wchar_t *string, int c );
        LPTSTR StrRChrI( LPCTSTR lpStart,LPCTSTR lpEnd,TCHAR wMatch); //不區(qū)分大小寫

      *注 StrRChr()函數(shù)可以通過StrChr()函數(shù)和while循環(huán)來實現(xiàn)。

補充：
查找字符串：

    _tcsstr（........）

字符串轉(zhuǎn)化為double型數(shù)字

    _tcstod( const char *nptr, char **endptr )

字符串轉(zhuǎn)化為double型整數(shù)（只取整數(shù)部分，不取小數(shù)）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

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") );