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The event handler that gets called when data is needed for sending.

void onSend (
  ulong delegate(void[]) callback
) @property;


callback the callback that has a void[] buffer to be filled


The callback returns the number of elements in the buffer that have been filled and are ready to send. The special value Curl.abortRequest can be returned in order to abort the current request. The special value Curl.pauseRequest can be returned in order to pause the current request.


Curl curl;
curl.set(CurlOption.url, "");

string msg = "Hello world";
curl.onSend = (void[] data)
    auto m = cast(void[]) msg;
    size_t length = m.length > data.length ? data.length : m.length;
    if (length == 0) return 0;
    data[0 .. length] = m[0 .. length];
    msg = msg[length..$];
    return length;


Jonas Drewsen. Some of the SMTP code contributed by Jimmy Cao.


Boost License 1.0.