After calling it, set $(D_KEYWORD +=) to the length could be
written.
$(D_PSYMBOL buffer) may return only part of the data. You may need
to call it (and set $(D_KEYWORD +=) several times until
$(D_PSYMBOL length) is 0). If all the data can be written,
maximally 3 calls are required.
After calling it, set $(D_KEYWORD +=) to the length could be written.
$(D_PSYMBOL buffer) may return only part of the data. You may need to call it (and set $(D_KEYWORD +=) several times until $(D_PSYMBOL length) is 0). If all the data can be written, maximally 3 calls are required.