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The QString class provides an abstraction of Unicode text and the classic C null-terminated char array (char*). More...
#include <qstring.h>
Inherited by QConstString.
QString uses implicit sharing, and so it is very efficient and easy to use.
In all QString methods that take const char* parameters, the const char* is interpreted as a classic C-style 0-terminated ASCII string. It is legal for the const char* parameter to be 0. The results are undefined if the const char* string is not 0-terminated. Functions that copy classic C strings into a QString will not copy the terminating 0-character. The QChar array of the QString (as returned by unicode()) is not terminated by a null.
A QString that has not been assigned to anything is null, i.e. both the length and data pointer is 0. A QString that references the empty string ("", a single '\0' char) is empty. Both null and empty QStrings are legal parameters to the methods. Assigning const char * 0 to QString gives a null QString.
Note that if you find that you are mixing usage of QCString, QString, and QByteArray, this causes lots of unnecessary copying and might indicate that the true nature of the data you are dealing with is uncertain. If the data is NUL-terminated 8-bit data, use QCString; if it is unterminated (ie. contains NULs) 8-bit data, use QByteArray; if it is text, use QString.
See also QChar and Shared classes
Examples: showimg/main.cpp grapher/grapher.cpp xform/xform.cpp layout/layout.cpp helpviewer/main.cpp life/main.cpp i18n/main.cpp drawdemo/drawdemo.cpp popup/popup.cpp menu/menu.cpp progress/progress.cpp qmag/qmag.cpp forever/forever.cpp rot13/rot13.cpp desktop/desktop.cpp scrollview/scrollview.cpp movies/main.cpp picture/picture.cpp hello/main.cpp
Constructs a null string.
See also isNull().
Constructs a string containing the one character ch.
Constructs a string that is a deep copy of ba interpreted as a classic C string.
Constructs a string that is a deep copy of the first length QChar in the array unicode.
If unicode and length are 0, a null string is created.
If only unicode is 0, the string is empty, but has length characters of space preallocated - QString expands automatically anyway, but this may speed some cases up a little.
See also isNull().
Constructs an implicitly-shared copy of s.
Constructs a string that is a deep copy of str, interpreted as a classic C string.
If str is 0 a null string is created.
This is a cast constructor, but it is perfectly safe: converting a Latin1 const char* to QString preserves all the information. You can disable this constructor by defining QT_NO_CAST_ASCII when you compile your applications. You can also make QString objects by using setLatin1()/fromLatin1(), or fromLocal8Bit(), fromUtf8(), or whatever encoding is appropriate for the 8-bit data you have.
See also isNull().
Destroys the string and frees the "real" string, if this was the last copy of that string.
Returns latin1(). Be sure to see the warnings documented there. Note that for new code which you wish to be strictly Unicode-clean, you can define the macro QT_NO_ASCII_CAST when compiling your code to hide this function so that automatic casts are not done. This has the added advantage that you catch the programming error described under operator!().
Appends ch to the string and returns a reference to the result. Equivalent to operator+=().
Appends ch to the string and returns a reference to the result. Equivalent to operator+=().
Appends str to the string and returns a reference to the result. Equivalent to operator+=().
Returns a string equal to this one, but with the lowest-numbered
occurrence of %i (for a positive integer i) replaced by a.
label.setText( tr("Rename %1 to %2?").arg(oldName).arg(newName) );
fieldwidth is the minimum amount of space a is padded to. A positive value produces right-aligned text, while a negative value produces left aligned text.
Warning: Using arg() for constructing "real" sentences programmatically is likely to lead to translation problems. Inserting objects like numbers or file names is fairly safe.
Warning: Relying on spaces to create alignment is prone to lead to translation problems.
If there is no %i pattern, a warning message (qWarning()) is
printed and the text as appended at the end of the string. This is
error recovery and should not occur in correct code.
See also QObject::tr().
This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
a is assumed to be in the Latin1 character set.
This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
is formatted according to the fmt format specified, which is 'g' by default and can be any of 'f', 'F', 'e', 'E', 'g' or 'G', all of which have the same meaning as for sprintf(). prec determines the precision, just as for number() and sprintf().
This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
a is expressed in to base notation, which is decimal by default and must be in the range 2-36 inclusive.
This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
a is expressed in to base notation, which is decimal by default and must be in the range 2-36 inclusive.
This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
a is expressed in to base notation, which is decimal by default and must be in the range 2-36 inclusive.
This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
a is expressed in to base notation, which is decimal by default and must be in the range 2-36 inclusive.
This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
a is expressed in to base notation, which is decimal by default and must be in the range 2-36 inclusive.
This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
a is expressed in to base notation, which is decimal by default and must be in the range 2-36 inclusive.
This function is obsolete. It is provided to keep old source working, and will probably be removed in a future version of Qt. We strongly advise against using it in new code.
This functions simply calls latin1() and returns the result.
Returns the character at i, or 0 if i is beyond the length of the string.
Note: If this QString is not const or const&, the non-const at() will be used instead, which will expand the string if i is beyond the length of the string.
Returns a reference to the character at i, expanding the string with QChar::null if necessary. The resulting reference can then be assigned to, or otherwise used immediately, but becomes invalid once further modifications are made to the string.
This function returns the basic directionality of the string (QChar::DirR for right to left and QChar::DirL for left to right). Useful to find the right alignment.
Compares this string to s, returning an integer less than, equal to, or greater than zero if it is, respectively, lexically less than, equal to, or greater than s.
[static]Compare s1 to s2 returning an integer less than, equal to, or greater than zero if s1 is, respectively, lexically less than, equal to, or greater than s2.
Note that this function is not supported in Qt 2.0, and is merely for experimental and illustrative purposes. It is mainly of interest to those experimenting with Arabic and other composition-rich texts.
Applies possible ligatures to a QString, useful when composition-rich text requires rendering with glyph-poor fonts, but also makes compositions such as QChar(0x0041) ('A') and QChar(0x0308) (Unicode accent diaresis) giving QChar(0x00c4) (German A Umlaut).
Equivalent to at(i), this returns the QChar at i by value.
See also ref().
Returns the number of times the character c occurs in the string.
The match is case sensitive if cs is TRUE, or case insensitive if cs is FALSE.
Counts the number of overlapping occurrences of rx in the string.
Example:
QString s = "banana and panama";
QRegExp r = QRegExp("a[nm]a", TRUE, FALSE);
s.contains( r ); // 4 matches
See also find() and findRev().
Returns the number of times str occurs in the string.
The match is case sensitive if cs is TRUE, or case insensitive if cs is FALSE.
This function counts overlapping substrings, for example, "banana" contains two occurrences of "ana".
See also findRev().
This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
This function is obsolete. It is provided to keep old source working, and will probably be removed in a future version of Qt. We strongly advise against using it in new code.
Returns a deep copy of this string.
Doing this is redundant in Qt 2.x, since QString is implicitly shared, and so will automatically be deeply copied as necessary.
Fills the string with len characters of value c.
If len is negative, the current string length is used.
Finds the first occurrence of the character c, starting at position index. If index is -1, the search starts at the last character; if -2, at the next to last character; etc.
The search is case sensitive if cs is TRUE, or case insensitive if cs is FALSE.
Returns the position of c, or -1 if c could not be found.
Finds the first occurrence of the regular expression rx, starting at position index. If index is -1, the search starts at the last character; if -2, at the next to last character; etc.
Returns the position of the next match, or -1 if rx was not found.
See also findRev(), replace() and contains().
Finds the first occurrence of the string str, starting at position index. If index is -1, the search starts at the last character; if -2, at the next to last character; etc.
The search is case sensitive if cs is TRUE, or case insensitive if cs is FALSE.
Returns the position of str, or -1 if str could not be found.
Equivalent to find(QString(str), index).
This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
Finds the first occurrence of the character c, starting at position index and searching backwards. If index is -1, the search starts at the last character; if -2, at the next to last character; etc.
The search is case sensitive if cs is TRUE, or case insensitive if cs is FALSE.
Returns the position of c, or -1 if c could not be found.
Finds the first occurrence of the regular expression rx, starting at position index and searching backwards. If index is -1, the search starts at the last character; if -2, at the next to last character; etc.
Returns the position of the next match (backwards), or -1 if rx was not found.
See also find().
Finds the first occurrence of the string str, starting at position index and searching backwards. If index is -1, the search starts at the last character; -2, at the next to last character; etc.
The search is case sensitive if cs is TRUE, or case insensitive if cs is FALSE.
Returns the position of str, or -1 if str could not be found.
Equivalent to findRev(QString(str), index).
This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
[static]Creates a QString from Latin1 text. This is the same as the QString(const char*) constructor, but you can make that constructor invisible if you compile with the define QT_NO_CAST_ASCII, in which case you can explicitly create a QString from Latin-1 text using this function.
[static]Returns the unicode string decoded from the first len bytes of local8Bit. If len is -1 (the default), the length of local8Bit is used. If trailing partial characters are in local8Bit, they are ignored.
local8Bit is assumed to be encoded in a locale-specific format.
See QTextCodec for more diverse coding/decoding of Unicode strings.
[static]Returns the unicode string decoded from the first len bytes of utf8. If len is -1 (the default), the length of utf8 is used. If trailing partial characters are in utf8, they are ignored.
See QTextCodec for more diverse coding/decoding of Unicode strings.
Insert c into the string at (before) position index and returns a reference to the string.
If index is beyond the end of the string, the string is extended with spaces (ASCII 32) to length index and c is then appended.
Example:
QString s = "Ys";
s.insert( 1, 'e' ); // s == "Yes"
s.insert( 3, '!'); // s == "Yes!"
See also remove() and replace().
Examples: xform/xform.cpp
Insert len units of QChar data from s into the string before position index.
Insert s into the string before position index.
If index is beyond the end of the string, the string is extended with spaces (ASCII 32) to length index and s is then appended.
QString s = "I like fish";
s.insert( 2, "don't "); // s == "I don't like fish"
s = "x";
s.insert( 3, "yz" ); // s == "x yz"
This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
Returns TRUE if the string is empty, i.e. if length() == 0. An empty string is not always a null string.
See example in isNull().
See also isNull() and length().
Examples: qmag/qmag.cpp hello/main.cpp
Returns TRUE if the string is null. A null string is also an empty string.
Example:
QString a; // a.unicode() == 0, a.length() == 0
QString b = ""; // b.unicode() == "", b.length() == 0
a.isNull(); // TRUE, because a.unicode() == 0
a.isEmpty(); // TRUE, because a.length() == 0
b.isNull(); // FALSE, because b.unicode() != 0
b.isEmpty(); // TRUE, because b.length() == 0
See also isEmpty() and length().
Returns a Latin-1 representation of the string. Note that the returned value is undefined if the string contains non-Latin-1 characters. If you want to convert strings into formats other than Unicode, see the QTextCodec classes.
This function is mainly useful for boot-strapping legacy code to use Unicode.
The result remains valid so long as one unmodified copy of the source string exists.
See also utf8() and local8Bit().
Returns a substring that contains the len leftmost characters of the string.
The whole string is returned if len exceeds the length of the string.
Example:
QString s = "Pineapple";
QString t = s.left( 4 ); // t == "Pine"
See also right(), mid() and isEmpty().
Returns a string of length width that contains this string and padded by the fill character.
If the length of the string exceeds width and truncate is FALSE, then the returned string is a copy of the string. If the length of the string exceeds width and truncate is TRUE, then the returned string is a left(width).
Example:
QString s("apple");
QString t = s.leftJustify(8, '.'); // t == "apple..."
See also rightJustify().
Returns the length of the string.
Null strings and empty strings have zero length.
See also isNull() and isEmpty().
Returns the string encoded in a locale-specific format. On X11, this is the QTextCodec::codecForLocale(). On Windows, it is a system-defined encoding.
See QTextCodec for more diverse coding/decoding of Unicode strings.
See also QString::fromLocal8Bit(), latin1() and utf8().
Returns a new string that is the string converted to lower case.
Example:
QString s("TeX");
QString t = s.lower(); // t == "tex"
See also upper().
Returns a substring that contains the len characters of this string, starting at position index.
Returns a null string if the string is empty or index is out of range. Returns the whole string from index if index+len exceeds the length of the string.
Example:
QString s = "Five pineapples";
QString t = s.mid( 5, 4 ); // t == "pine"
Examples: qmag/qmag.cpp
[static]This static function returns the printed value of n, formatted in the f format with prec precision.
f can be 'f', 'F', 'e', 'E', 'g' or 'G', all of which have the same meaning as for sprintf().
See also setNum().
[static]A convenience factory function that returns a string representation of the number n.
See also setNum().
[static]A convenience factory function that returns a string representation of the number n.
See also setNum().
[static]A convenience factory function that returns a string representation of the number n.
See also setNum().
[static]A convenience factory function that returns a string representation of the number n.
See also setNum().
Returns TRUE if it is a null string, otherwise FALSE. Thus you can write:
QString name = getName();
if ( !name )
name = "Rodney";
Note that if you say:
QString name = getName();
if ( name )
doSomethingWith(name);
Then this will call operator const char*(), which will do what you want, but rather inefficiently - you may wish to define the macro QT_NO_ASCII_CAST when writing code which you wish to strictly remain Unicode-clean.
When you want the above semantics, use !isNull() or even !!:
QString name = getName();
if ( !!name )
doSomethingWith(name);
Appends c to the string and returns a reference to the string.
Appends c to the string and returns a reference to the string.
Appends str to the string and returns a reference to the string.
Assigns a deep copy of cs, interpreted as a classic C string, to this string and returns a reference to this string.
Assigns a shallow copy of s to this string and returns a reference to this string.
Assigns a deep copy of str, interpreted as a classic C string, to this string and returns a reference to this string.
If str is 0 a null string is created.
See also isNull().
Sets the string to contain just the single character c.
Sets the string to contain just the single character c.
Returns the character at i, or QChar::null if i is beyond the length of the string.
Note: If this QString is not const or const&, the non-const operator[] will be used instead, which will expand the string if i is beyond the length of the string.
Returns an object that references the character at i. This reference can then be assigned to, or otherwise used immediately, but becomes invalid once further modifications are made to the string. The QCharRef internal class can be used much like a constant QChar, but if you assign to it, you change the original string (which enlarges and detaches itself). You will get compilation errors if you try to use the result as anything but a QChar.
Prepend s to the string. Equivalent to insert(0,s).
See also insert().
Prepends ch to the string and returns a reference to the result.
See also insert().
Prepends ch to the string and returns a reference to the result.
See also insert().
Returns the QChar at i by reference.
See also constref().
Removes len characters starting at position index from the string and returns a reference to the string.
If index is too big, nothing happens. If index is valid, but len is too large, the rest of the string is removed.
QString s = "Montreal";
s.remove( 1, 4 );
// s == "Meal"
See also insert() and replace().
Replaces every occurrence of rx in the string with str. Returns a reference to the string.
Examples:
QString s = "banana";
s.replace( QRegExp("a.*a"), "" ); // becomes "b"
QString s = "banana";
s.replace( QRegExp("^[bn]a"), " " ); // becomes " nana"
QString s = "banana";
s.replace( QRegExp("^[bn]a"), "" ); // NOTE! becomes ""
See also find() and findRev().
Replaces len characters starting at position index by slen units ot QChar data from s, and returns a reference to the string.
See also insert() and remove().
Replaces len characters starting at position index from the string with s, and returns a reference to the string.
If index is too big, nothing is deleted and s is inserted at the end of the string. If index is valid, but len is too large, str replaces the rest of the string.
QString s = "Say yes!";
s.replace( 4, 3, "NO" ); // s == "Say NO!"
See also insert() and remove().
Examples: qmag/qmag.cpp
Returns a substring that contains the len rightmost characters of the string.
The whole string is returned if len exceeds the length of the string.
Example:
QString s = "Pineapple";
QString t = s.right( 5 ); // t == "apple"
See also left(), mid() and isEmpty().
Returns a string of length width that contains pad characters followed by the string.
If the length of the string exceeds width and truncate is FALSE, then the returned string is a copy of the string. If the length of the string exceeds width and truncate is TRUE, then the returned string is a left(width).
Example:
QString s("pie");
QString t = s.rightJustify(8, '.'); // t == ".....pie"
See also leftJustify().
This function is obsolete. It is provided to keep old source working, and will probably be removed in a future version of Qt. We strongly advise against using it in new code.
Sets the character at position index to c and expands the string if necessary, filling with spaces.
This method is redundant in Qt 2.x, because operator[] will expand the string as necessary.
Sets this string to str, interpreted as a classic Latin 1 C string. If the len argument is negative (default), it is set to strlen(str).
If str is 0 a null string is created. If str is "" an empty string is created.
See also isNull() and isEmpty().
Sets the string to the printed value of n, formatted in the f format with prec precision, and returns a reference to the string.
f can be 'f', 'F', 'e', 'E', 'g' or 'G', all of which have the same meaning as for sprintf().
Sets the string to the printed value of n and returns a reference to the string.
Sets the string to the printed value of n and returns a reference to the string.
The value is converted to base notation (default is decimal). The base must be a value from 2 to 36.
Sets the string to the printed value of n and returns a reference to the string.
Sets the string to the printed unsigned value of n and returns a reference to the string.
Sets the string to the printed unsigned value of n and returns a reference to the string.
The value is converted to base notation (default is decimal). The base must be a value from 2 to 36.
Sets the string to the printed unsigned value of n and returns a reference to the string.
This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
Resizes the string to len unicode characters and copies unicode into the string. If unicode is null, nothing is copied, but the string is resized to len anyway. If len is zero, the string becomes a null string.
See also setLatin1() and isNull().
Resizes the string to len unicode characters and copies unicode_as_ushorts into the string (on some X11 client platforms this will involve a byte-swapping pass).
If unicode is null, nothing is copied, but the string is resized to len anyway. If len is zero, the string becomes a null string.
See also setLatin1() and isNull().
Returns a new string that has white space removed from the start and the end, plus any sequence of internal white space replaced with a single space (ASCII 32).
White space means any character for which QChar::isSpace() returns TRUE. This includes ASCII characters 9 (TAB), 10 (LF), 11 (VT), 12 (FF), 13 (CR), and 32 (Space).
QString s = " lots\t of\nwhite space ";
QString t = s.simplifyWhiteSpace(); // t == "lots of white space"
See also stripWhiteSpace().
Safely builds a formatted string from a format string and an arbitrary list of arguments. The format string supports all the escape sequences of printf() in the standard C library.
The %s escape sequence expects a utf8() encoded string. The format string cformat is expected to be in latin1. If you need a unicode format string, use QString::arg() instead. For typesafe string building, with full Unicode support, you can use QTextOStream like this:
QString str;
QString s = ...;
int x = ...;
QTextOStream(&str) << s << " : " << x;
For translations, especially if the strings contains more than one escape sequence, you should consider using the arg() function instead. This allows the order of the replacements to be controlled by the translator, and has Unicode support.
See also arg().
Examples: xform/xform.cpp layout/layout.cpp drawdemo/drawdemo.cpp popup/popup.cpp progress/progress.cpp qmag/qmag.cpp forever/forever.cpp scrollview/scrollview.cpp movies/main.cpp picture/picture.cpp
Returns whether the strings starts with s, or not.
Returns a new string that has white space removed from the start and the end.
White space means any character for which QChar::isSpace() returns TRUE. This includes ASCII characters 9 (TAB), 10 (LF), 11 (VT), 12 (FF), 13 (CR), and 32 (Space).
Example:
QString s = " space ";
QString t = s.stripWhiteSpace(); // t == "space"
See also simplifyWhiteSpace().
Returns the string converted to a double value.
If ok is non-null, *ok is set to TRUE if there are no conceivable errors, and FALSE if the string is not a number at all, or if it has trailing garbage.
Returns the string converted to a float value.
If ok is non-null, *ok is set to TRUE if there are no conceivable errors, and FALSE if the string is not a number at all, or if it has trailing garbage.
Returns the string converted to a int value.
QString str("FF");
bool ok;
int hex = str.toInt( &ok, "16" ); // will return 255, and ok set to TRUE
int dec = str.toInt( &ok, "10" ); // will return 0, and ok set to FALSE
If ok is non-null, *ok is set to TRUE if there are no conceivable errors, and FALSE if the string is not a number at all, or if it has trailing garbage.
Returns the string converted to a long value.
If ok is non-null, *ok is set to TRUE if there are no conceivable errors, and FALSE if the string is not a number at all, or if it has trailing garbage.
Returns the string converted to a short value.
If ok is non-null, *ok is set to TRUE if there are no conceivable errors, and FALSE if the string is not a number at all, or if it has trailing garbage.
Returns the string converted to an unsigned int value.
If ok is non-null, *ok is set to TRUE if there are no conceivable errors, and FALSE if the string is not a number at all, or if it has trailing garbage.
Returns the string converted to an unsigned long
value.
If ok is non-null, *ok is set to TRUE if there are no conceivable errors, and FALSE if the string is not a number at all, or if it has trailing garbage.
Returns the string converted to an unsigned short value.
If ok is non-null, *ok is set to TRUE if there are no conceivable errors, and FALSE if the string is not a number at all, or if it has trailing garbage.
Truncates the string at position newLen if newLen is less than the current length . Otherwise, nothing happens.
Example:
QString s = "truncate this string";
s.truncate( 5 ); // s == "trunc"
In Qt 1.x, it was possible to "truncate" a string to a longer length. This is no longer possible.
Returns the Unicode representation of the string. The result remains valid until the string is modified.
Returns a new string that is the string converted to upper case.
Example:
QString s("TeX");
QString t = s.upper(); // t == "TEX"
See also lower().
Returns the string encoded in UTF8 format.
See QTextCodec for more diverse coding/decoding of Unicode strings.
See also QString::fromUtf8(), local8Bit() and latin1().
This function returns the QString ordered visually. Useful for painting the string or when transforming to a visually ordered encoding.
Reads a string from the stream.
See also Format of the QDataStream operators
Returns the concatenated string of s1 and s2.
Returns TRUE if s1 is alphabetically less than or equal to s2, otherwise FALSE.
Equivalent to qstrcmp(s1,s2) <= 0
Returns the concatenated string of s1 and s2.
Returns the concatenated string of s1 and s2.
Writes a string to the stream.
See also Format of the QDataStream operators
Returns TRUE if the two strings are equal, or FALSE if they are different. A null string is different from an empty, non-null string.
Equivalent to qstrcmp(s1,s2) == 0
Returns TRUE if the two strings are different, or FALSE if they are equal.
Equivalent to qstrcmp(s1,s2) != 0
Returns TRUE if the two strings are different, or FALSE if they are equal.
Equivalent to qstrcmp(s1,s2) != 0
Returns TRUE if s1 is alphabetically less than s2, otherwise FALSE.
Equivalent to qstrcmp(s1,s2) < 0
Returns TRUE if s1 is alphabetically greater than or equal to s2, otherwise FALSE.
Equivalent to qstrcmp(s1,s2) >= 0
Returns the concatenated string of c and s.
Returns TRUE if s1 is alphabetically less than or equal to s2, otherwise FALSE.
Equivalent to qstrcmp(s1,s2) <= 0
Returns the concatenated string of s and c.
Returns TRUE if s1 is alphabetically greater than s2, otherwise FALSE.
Equivalent to qstrcmp(s1,s2) > 0
Returns TRUE if s1 is alphabetically less than s2, otherwise FALSE.
Equivalent to qstrcmp(s1,s2) < 0
Returns TRUE if the two strings are different, or FALSE if they are equal.
Equivalent to qstrcmp(s1,s2) != 0
Returns TRUE if the two strings are equal, or FALSE if they are different.
Equivalent to qstrcmp(s1,s2) == 0
Returns TRUE if the two strings are equal, or FALSE if they are different.
Equivalent to qstrcmp(s1,s2) == 0
Returns TRUE if s1 is alphabetically greater than s2, otherwise FALSE.
Equivalent to qstrcmp(s1,s2) > 0
Returns TRUE if s1 is alphabetically greater than or equal to s2, otherwise FALSE.
Equivalent to qstrcmp(s1,s2) >= 0
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