# GB.ConvString

    int GB.ConvString ( char ** result , const char * str, long len, const char * src, const char *dst )

Converts a string form one charset to another charset.

- result will receive the result of the conversion as a temporary string.
- str points at the string to convert.
- len is the length of this string.
- src is the source charset.
- dst is the destination charset.

This function returns a non-zero value if the conversion is impossible, and internally calls GB.Error() with the error cause.