wxStringTokenizer

wxStringTokenizer helps you to break a string up into a number of tokens. It replaces the standard C function strtok() and also extends it in a number of ways.

To use this class, you should create a wxStringTokenizer object, give it the string to tokenize and also the delimiters which separate tokens in the string (by default, white space characters will be used).

Then GetNextToken may be called repeatedly until it HasMoreTokens returns FALSE.

For example:

wxStringTokenizer tkz(wxT("first:second:third:fourth"), wxT(":"));
while ( tkz.HasMoreTokens() )
{
    wxString token = tkz.GetNextToken();

    // process token here
}

By default, wxStringTokenizer will behave in the same way as strtok() if the delimiters string only contains white space characters but, unlike the standard function, it will return empty tokens if this is not the case. This is helpful for parsing strictly formatted data where the number of fields is fixed but some of them may be empty (i.e. TAB or comma delimited text files).

The behaviour is governed by the last constructor/SetString parameter mode which may be one of the following:

wxTOKEN_DEFAULT Default behaviour (as described above): same as wxTOKEN_STRTOK if the delimiter string contains only whitespaces, same as wxTOKEN_RET_EMPTY otherwise
wxTOKEN_RET_EMPTY In this mode, the empty tokens in the middle of the string will be returned, i.e. "a::b:" will be tokenized in three tokens `a', `' and `b'.
wxTOKEN_RET_EMPTY_ALL In this mode, empty trailing token (after the last delimiter character) will be returned as well. The string as above will contain four tokens: the already mentioned ones and another empty one as the last one.
wxTOKEN_RET_DELIMS In this mode, the delimiter character after the end of the current token (there may be none if this is the last token) is returned appended to the token. Otherwise, it is the same mode as wxTOKEN_RET_EMPTY.
wxTOKEN_STRTOK In this mode the class behaves exactly like the standard strtok() function. The empty tokens are never returned.

Derived from

wxObject

Include files

<wx/tokenzr.h>



wxStringTokenizer::wxStringTokenizer



wxStringTokenizer(void)

Default constructor. You must call SetString before calling any other methods.



wxStringTokenizer(const wxString& str, const wxString& delims = " $\backslash$t$\backslash$r$\backslash$n", wxStringTokenizerMode mode = wxTOKEN_DEFAULT)

Constructor. Pass the string to tokenize, a string containing delimiters and the mode specifying how the string should be tokenized.



wxStringTokenizer::CountTokens

int CountTokens(void) const

Returns the number of tokens remaining in the input string. The number of tokens returned by this function is decremented each time GetNextToken is called and when it reaches $0$ HasMoreTokens returns FALSE.



wxStringTokenizer::HasMoreTokens

bool HasMoreTokens(void) const

Returns TRUEif the tokenizer has further tokens, FALSEif none are left.



wxStringTokenizer::GetNextToken



wxString GetNextToken(void)

Returns the next token or empty string if the end of string was reached.



wxStringTokenizer::GetPosition

size_t GetPosition(void) const

Returns the current position (i.e. one index after the last returned token or 0 if GetNextToken() has never been called) in the original string.



wxStringTokenizer::GetString

wxString GetString(void) const

Returns the part of the starting string without all token already extracted.



wxStringTokenizer::SetString



void SetString(const wxString& to_tokenize, const wxString& delims = " $\backslash$t$\backslash$r$\backslash$n", wxStringTokenizerMode mode = wxTOKEN_DEFAULT)

Initializes the tokenizer.

Pass the string to tokenize, a string containing delimiters, and the mode specifying how the string should be tokenized.

ymasuda 平成17年11月19日