Cstring function Introduction

Cstring Constructor
Cstring ();
Example: cstring csstr;

Cstring (const cstring & stringsrc );
Example: cstring csstr ("abcdef Chinese 123456 ");
Cstring csstr2 (csstr );

Cstring (tchar CH, int nrepeat = 1 );
Example: cstring csstr ('A', 5 );
// Csstr = "AAAAA"

Cstring (maid, int nlength );
Example: cstring csstr ("abcdef", 3 );
// Csstr = "ABC"

Cstring (lpcwstr lpsz );
Example: wchar_t s [] = l "abcdef ";
Cstring csstr (s );
// Csstr = l "abcdef"

Cstring (const unsigned char * psz );
Example: const unsigned char s [] = "abcdef ";
Const unsigned char * sp = s;
Cstring csstr (SP );
// Csstr = "abcdef"

Cstring (lpcstr lpsz );
Example: cstring csstr ("abcdef ");
// Csstr = "abcdef"

Int getlength () const;
Returns the length of a string, excluding the trailing null characters.
Example: csstr = "abcdef Chinese 123456 ";
Printf ("% d", csstr. getlength ());
// 16

Void makereverse ();
Reverse the string order
Example: csstr = "abcdef Chinese 123456 ";
Csstr. makereverse ();
Cout <csstr; // CBA in article 654321

Void makeupper ();
Convert lowercase letters to uppercase letters
Example: csstr = "abcdef Chinese 123456 ";
Csstr. makeupper ();
Cout <csstr; // abcdef Chinese 123456

Void makelower ();
Convert uppercase letters to lowercase letters
Example: csstr = "abcdef Chinese 123456 ";
Csstr. makelower ();
Cout <csstr; // abcdef Chinese 123456

Int compare (lpctstr lpsz) const;
Compare two strings in case sensitive. If the value is equal, 0 is returned. If the value is greater than 1, 1 is returned. If the value is smaller than 1,-1 is returned.
Example: csstr = "abcdef Chinese 123456 ";
Csstr2 = "abcdef Chinese 123456 ";
Cout <csstr. comparenocase (csstr2 );
// 0

Int comparenocase (lpctstr lpsz) const;
Compare two strings in case-insensitive mode. If the values are equal, 0 is returned. If the values are greater than 1, 1 is returned. If the values are less than 1,-1 is returned.
Example: csstr = "abcdef Chinese 123456 ";
Csstr2 = "abcdef Chinese 123456 ";
Cout <csstr. comparenocase (csstr2 );
//-1

Int Delete (INT nindex, int ncount = 1)
Delete characters. Delete the ncount characters starting with the subscript nindex.
Example: csstr = "abcdef ";
Csstr. Delete (2, 3 );
Cout <csstr; // abf
// When the nindex is too large and exceeds the memory area of the object, the function does not perform any operations.
// When nindex is negative, it is deleted from the first character.
// When the ncount value is too large and the characters to be deleted exceed the memory area of the object, unexpected results may occur.
// When ncount is a negative number, no operation is performed on the function.

Int insert (INT nindex, tchar ch)
Int insert (INT nindex, lpctstr pstr)
Insert a character or string at the position marked as nindex. Returns the length of the inserted object.
Example: csstr = "ABC ";
Csstr. insert (2, 'x ');
Cout <csstr; // abxc
Csstr = "ABC ";
Csstr. insert (2, "XYZ ");
Cout <csstr; // abxyzc
// When nindex is negative, it is inserted at the beginning of the object
// When nindex exceeds the end of the object, it is inserted at the end of the object.

Int remove (tchar ch );
Removes specified characters from an object. Return the number of removed items.
Example: csstr = "aabbaacc ";
Csstr. Remove ('A ');
Cout <csstr; // bbcc

Int Replace (tchar chold, tchar chnew );
Int Replace (maid, maid );
Replacement string
Example: csstr = "abcdef ";
Csstr. Replace ('A', 'x ');
Cout <csstr; // xbcdef
Csstr = "abcdef ";
Csstr. Replace ("ABC", "XYZ ");
Cout <csstr; // xyzdef

Void trimleft ();
Void trimleft (tchar chtarget );
Void trimleft (lpctstr lpsztargets );
Delete the character from the left. The deleted character matches chtarget or lpsztargets until the first unmatched character is deleted.
Example: csstr = "aaabaacdef ";
Csstr. trimleft ('A ');
Cout <csstr; // baacdef
Csstr = "aaabaacdef ";
Csstr. trimleft ("AB ");
Cout <csstr; // cdef
// Delete spaces when no parameters exist

Void trimright ();
Void trimright (tchar chtarget );
Void trimright (lpctstr lpsztargets );
Delete the character from the right. The deleted character matches chtarget or lpsztargets until the first unmatched character is deleted.
Example: csstr = "abcdeaafaaa ";
Csstr. trimright ('A ');
Cout <csstr;
// Abcdeaaf
Csstr = "abcdeaafaaa ";
Csstr. trimright ("Fa ");
Cout <csstr; // ABCDE
// Delete spaces when no parameters exist

Void empty ();
Clear
Example: csstr = "abcdef ";
Csstr. Empty ();
Printf ("% d", csstr. getlength (); // 0

Bool isempty () const;
Whether the test object is null. If it is null, zero is returned. If it is not null, non-zero is returned.
Example: csstr = "ABC ";
Cout <csstr. isempty ();
// 0;
Csstr. Empty ();
Cout <csstr. isempty ();
// 1;

Int find (tchar ch) const;
Int find (lpctstr lpszsub) const;
Int find (tchar CH, int nstart) const;
Int find (lpctstr pstr, int nstart) const;
Query string. nstart is the start position. -1 is returned if no matching is found; otherwise, the start position of the returned string is returned.
Example: csstr = "abcdef ";
Cout <csstr. Find ('B ');
// 1
Cout <csstr. Find ("de"); // 3
Cout <csstr. Find ('B', 3 );
//-1
Cout <csstr. Find ('B', 0 );
// 1
Cout <csstr. Find ("de", 4); //-1
Cout <csstr. Find ("de", 0); // 3
// If nstart exceeds the end of the object,-1 is returned.
// If nstart is negative,-1 is returned.

Int findoneof (lpctstr lpszcharset) const;
Find the matching position of any character in the lpszcharset in the cstring object. -1 is returned if not found; otherwise, the start position of the returned string is returned.
Example: csstr = "abcdef ";
Cout <csstr. findoneof ("cxy"); // 2

Cstring spanexcluding (lpctstr lpszcharset) const;
Returns the substring before the first character that matches any lpszcharset in the object.
Example: csstr = "abcdef ";
Cout <csstr. spanexcluding ("CF"); // AB

Cstring spanincluding (lpctstr lpszcharset) const;
Find any character that does not match any character in lpszcharse from the object, and return the string before the first character that does not match
Example: csstr = "abcdef ";
Cout <csstr. spanincluding ("fdcba"); // ABCD

Int reversefind (tchar ch) const;
Search for the first match from the back to the front. The subscript is returned when the match is found. -1 is returned when no result is found.
Example: csstr = "Abba ";
Cout <csstr. reversefind ('A'); // 3

Void format (lpctstr lpszformat ,...);
Void format (uint nformatid ,...);
Format the object. It is used in the same way as the sprintf function in C language.
Example: csstr. Format ("% d", 13 );
Cout <csstr;
// 13

Tchar getat (INT nindex) const;
Returns the nindex character, which is used in the same way as the string [].
Example: csstr = "abcdef ";
Cout <csstr. getat (2 );
// C
// When nindex is a negative number or exceeds the end of the object, unexpected results will occur.

Void setat (INT nindex, tchar ch );
Assign a value to the character whose subscript is nindex.
Example: csstr = "abcdef ";
Csstr. setat (2, 'x ');
Cout <csstr; // abxdef
// When nindex is a negative number or exceeds the end of the object, unexpected results will occur.

Cstring left (INT ncount) const;
Returns the string from the left.
Example: csstr = "abcdef ";
Cout <csstr. Left (3); // ABC
// If ncount is equal to 0, null is returned.
// If ncount is negative, null is returned.
// When ncount is greater than the object length, the returned value is the same as that of the object.

Cstring right (INT ncount) const;
Extract string from right
Example: csstr = "abcdef ";
Cout <csstr. Right (3 );
// Def
// If ncount is equal to 0, null is returned.
// If ncount is negative, null is returned.
// When ncount is greater than the object length, the returned value is the same as that of the object.

Cstring mid (INT nfirst) const;
Cstring mid (INT nfirst, int ncount) const;
Returns the string starting from the center.
Example: csstr = "abcdef ";
Cout <csstr. mid (2 );
// Cdef
Csstr = "abcdef ";
Cout <csstr. mid (2, 3 );
// CDE
// When nfirst is 0 and negative, it starts from the first character.
// If nfirst is equal to the end of the object, an empty string is returned.
// When nfirst exceeds the end of the object, unexpected results will occur.
// When ncount exceeds the end of the object, the string from nfirst to the end of the object is returned.
// When ncount is 0 and negative, an empty string is returned.

Lptstr getbuffer (INT nminbuflength );
Apply for a new space and return a pointer
Example: csstr = "ABCDE ";
Lptstr pstr = csstr. getbuffer (10 );
Strcpy (pstr, "12345 ");
Csstr. releasebuffer ();
Pstr = NULL;
Cout <csstr // 12345
// After using getbuffer, you must use releasebuffer to update internal data of the object. Otherwise, unexpected results may occur.

Void releasebuffer (INT nnewlength =-1 );
After getbuffer is used, releasebuffer must be used to update internal data of the object.
Example: csstr = "ABC ";
Lptstr pstr = csstr. getbuffer (10 );
Strcpy (pstr, "12345 ");
Cout <csstr. getlength ();
// 3 (incorrect usage)
Csstr. releasebuffer ();
Cout <csstr. getlength ();
// 5 (correct)
Pstr = NULL;
// Any method of the cstring object should be called after releasebuffer

Lptstr getbuffersetlength (INT nnewlength );
Apply for a new space and return a pointer
Example: csstr = "ABC ";
Csstr. getbuffersetlength (20 );
Cout <csstr; // ABC
Count <csstr. getlength (); // 20;
Csstr. releasebuffer ();
Count <csstr. getlength ();
// 3;
// You do not need to use releasebuffer after using getbuffersetlength.