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<!DOCTYPE HTML PUBLIC>
<html>
<title>Base DBMS Chapter 14</title>
<body bgcolor=#FFFFFF>
<h1><p align="center">xbString Methods</p></h1>
<p align="center">Chapter Updated 8/20/03</p><hr>
<h2>This table lists the xbString methods.</h2><br><br>
<table border>
<caption align=top><h3>xbString Method List API</h3></caption>
<tr valign=baseline>
<tr><th align=left>Method<td>Description
<tr><th align=left>xbString()<td>Class Constructor
<tr><th align=left>xbString(size_t size)<td>Constructor, allocates space of size
<tr><th align=left>xbString(char c)<td>Constructor, initialized to char c
<tr><th align=left>xbString(const char *s)<td>Constructor, initialized to string s
<tr><th align=left>xbString(const char *s, size_t maxlen<td>
Constructor, initialized to string s, with minimal string buf size of max_len
<tr><th align=left>xbString(const xbString &s)<td>Constructor, initialized to string s
<tr><th align=left>~xbString()<td>Class Destructor
<tr><th align=left>const char operator*()<td>Returns data
<tr><th align=left>char operator[](int n)<td>Returns char in position n
<tr><th align=left>xbString &operator=(const xbString &s)<br>
xbString &operator=(const char *s)<br>xbString &operator=(char c)
<td>Set string to <em>s</em> or <em>c</em>.
<tr><th align=left>xbString &operator+=(const char *s)<br>
xbSting &operator+=(char c)<td>Concatonate data to string
<tr><th align=left>xbString &operator-=(const char *s)<br>
xbSting &operator+=(char c)<td>Concatonate data and eliminate spaces between
strings.
<tr><th align=left>bool operator==(const xbString &)<td>
Compare string ==
<tr><th align=left>bool operator!=(const xbString &)<td>
Compare string !=
<tr><th align=left>bool operator<(const xbString &s)<td>
Compare string <
<tr><th align=left>bool operator>(const xbString &s)<td>
Compare string >
<tr><th align=left>bool operator<=(const xbString &s)<td>
Compare string <=
<tr><th align=left>bool operator<=(const xbString &s)<td>
Compare string >=
<tr><th align=left>xbString addBackSlash( char c )<td>Prefixes all
char <em>c</em> with a backslash.
<tr><th align=left>xbString& assign(const xbString& str, size_t pos = 0,
int len = 1)<td>Assign data in <em>str</em> starting at position <em>pos</em>
for a length of <em>len</em> and return a reference.
<tr><th align=left>xbString& assign(const xbString& str, int len )<td>
Assign data in <em>str</em> for a length of <em>len</em> and return a reference.
<tr><th align=left>xbString copy() const<td>Used to copy a string
<tr><th align=left>const char * c_str() const<td>Returns the string or NULL
if string is null. Depreciated function.
<tr><th align=left>int countChar( char c ) const<td>Returns the count
of char <em>c</em>.
<tr><th align=left>int cvtHexChar( char & out )<td>Converts a four byte
string in the format of 0x00 to a one byte char value <em>out</em>. Returns
0 on success, -1 on error.
<tr><th align=left>int cvtHexString( zbString & out )<td>Converts a
string of four byte groupings in the format of 0x00 to a string of one byte
characters <em>out</em>. Returns 0 on success, -1 on error.
<tr><th align=left>char getCharacter( int n ) const<td>Returns the character
as position <em>n</em>.
<tr><th align=left>const char *getdata() const<td>Returns the string
<tr><th align=left>bool hasAlphaChars() const<td>Returns true is string
contains any alpha characters, otherwise returns false.
<tr><th align=left>bool isEmpty() const<td>Returns true if the string has
no memory allocated, or memory allocated is a zero byte string, otherwise
returns false
<tr><th align=left>bool isNull() const<td>Returns true if the string
has no memory allocated for the string, otherwise returns false
<tr><th align=left>size_t len() const<br>size_t length() const
<td>Returns length of string. It does not include the null terminating byte.
<tr><th align=left>xbString mid( size_t pos, int len )<td>Pull a string of
data out of another string of data, starting at position <em>pos</em> for a
length of <em>len</em>.
<tr><th align=left>void ltrunc( size_t cnt )<td>Left truncate the string
<em>cnt</em> bytes.
<tr><th align=left>int pos(char c)<td>Locate character in string
<tr><th align=left>int pos(const char *s)<td>Locate string <em>s</em> in string
<tr><th align=left>void swapChars(char from, char to)<td>Swap character
<em>from</em> to character <em>to</em>.
<tr><th align=left>void putAt(size_t pos, char c)<td>Put character c at position pos
<tr><th align=left>void remove( size_t pos = 0, int len )<td>Remove data
from the string to starting at <em>pos</em> for a lenght of <em>len</em>.
<tr><th align=left>void setNum(long num)<td>This method sets the string
to the numeric value <em>num</em>.
<tr><th align=left>xbString &sprintf(const char * format, ... )<td>
Used to format a string. See the standard C printf function for formatting
details. Internal 256 byte buffer which can be overflowed.
<tr><th align=left>void toLowerCase()<td>Converts string to lower case
<tr><th align=left>void toUpperCase()<td>Converts string to upper case
<tr><th align=left>void trim()<td>trim trailing spaces
<tr><th align=left>void zapChar( char c )<td>Remove all instances of
<em>c</em> from the string.
<tr><th align=left>void zapLeadingChar( char c )<td>Left truncate all
of <em>c</em> from the string.
<tr><th align=left>
xbString operator-(const xbString &s1, const xbString &s2)
<td>Concatonate two strings together, eliminate spaces
<tr><th align=left>
xbString operator+(const xbString &s1, const xbString &s2)<br>
xbString operator+(const xbString &s1, const char *s2)<br>
xbString operator+(const char *s1, const xbString &s2)<br>
xbString operator+(const xbString &s1, char c2)<br>
xbString operator+(char c1, const xbString &s2)<td>Concatonate two
strings together
<tr><th align=left>bool operator==(const xbString &, const char *)<td>
Compare string ==
<tr><th align=left>bool operator!=(const xbString &, const char *)<td>
Compare string !=
</table><br><br><br>
<h2>Sample program</h2>
<xmp>
/* string.cpp
Xbase project source code
This program demonstrates the usage of the xbString class
Copyright (C) 1997 Gary A. Kunkel
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Contact:
Mail:
Technology Associates, Inc.
XBase Project
1455 Deming Way #11
Sparks, NV 89434
USA
Email:
xbase@techass.com
xdb-devel@lists.sourceforge.net
xdb-users@lists.sourceforge.net
Website:
xdb.sourceforge.net
*/
#include <xbase/xbase.h>
int main()
{
xbString s1;
xbString s2;
s1 = "Some string data";
s2 = "some more string data";
std::cout << "s1 => " << s1 << std::endl;
std::cout << "s2 => " << s2 << std::endl;
s1 = "s1 ";
s2 = "s2";
s1 -= s2;
std::cout << "-= operator => " << s1 << std::endl;
s1 = "s1 ";
s2 = "s2";
s1 += s2;
std::cout << "+= operator => " << s1 << std::endl;
s1 = "some data";
s2 = s1.mid( 2, 3 );
std::cout << "mid() = " << s2 << std::endl;
return 0;
}
</xmp>
<br><hr>
<p><img src="xbase.jpg"><br><hr>
</body>
</html>
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