wxStringBuffer

This tiny class allows to conveniently access the wxString internal buffer as a writable pointer without any risk of forgetting to restore the string to the usable state later.

For example, assuming you have a low-level OS function called GetMeaningOfLifeAsString(char *) returning the value in the provided buffer (which must be writable, of course) you might call it like this:

    wxString theAnswer;
    GetMeaningOfLifeAsString(wxStringBuffer(theAnswer, 1024));
    if ( theAnswer != "42" )
    {
        wxLogError("Something is very wrong!");
    }

Note that the exact usage of this depends on whether on not wxUSE_STL is enabled. If wxUSE_STL is enabled, wxStringBuffer creates a seperate empty character buffer, and if wxUSE_STL is disabled, it uses GetWriteBuf() from wxString, keeping the same buffer wxString uses intact. In other words, relying on wxStringBuffer containing the old wxString data is probably not a good idea if you want to build your program in both with and without wxUSE_STL.

Derived from

None

Include files

<wx/string.h>



wxStringBuffer::wxStringBuffer



wxStringBuffer(const wxString& str, size_t len)

Constructs a writable string buffer object associated with the given string and containing enough space for at least len characters. Basically, this is equivalent to calling GetWriteBuf and saving the result.



wxStringBuffer::~wxStringBuffer



~wxStringBuffer(void)

Restores the string passed to the constructor to the usable state by calling UngetWriteBuf on it.



wxStringBuffer::operator wxChar *



wxChar * operator wxChar *(void)

Returns the writable pointer to a buffer of the size at least equal to the length specified in the constructor.

ymasuda 平成17年11月19日