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unsigned int ByteLength() const {return m_byteLength;}

unsigned int Length() const {return m_charLength;}

unsigned int ByteLengthTo(int charOffset);

int IsEmpty();

Notice that the first two functions are called ByteLength() and Length(). If you

remember, CPStrings are made to hold single-byte or multiple-byte characters. This

means that a string’s byte length is not always equal to its character length. Be

careful when allocating a string to use ByteLength() and not Length().

ByteLengthTo() converts a character offset to a byte offset and IsEmpty() returns a 1 if

the string is not empty.

For example usage of some of these functions, take a look at the following code:

CP_CHAR multi[3]={0xEE,0x6E,0};

CPString str1((PEGCHAR*)multi); //multi-byte character

CPString str2("2");

int j;

j = str1.ByteLength(); // j=2

j = str1.Length()); // j=1

j = str2.ByteLength(); // j=1

j = str2.Length(); // j=1

You can change the case of a string with the following functions:

void ToggleCase();

void UpperCase();

void LowerCase();

You can return the substring of a string by using the Mid() or Left() :

CPString Mid(int charOffset);

CPString Left(int charOffset);

Left() returns a sub-string from the beginning of the string to the character offset

charOffset. Whereas Mid() extracts a sub-string from the end of the string to the

character offset charOffset.

To clear the contents of a CPString use:

void Clear();

Finally, you can replace all of the occurrences of a character in a CPString with:

void ReplaceCharacter(CPMCHAR c0, CPMCHAR c1);

101

Casio ClassPad 300 Programming Guide

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