C / C++ / MFC

void ReceiveDone(IAsyncResult^ ar) {
    Socket^ s = safe_cast<Socket^>(ar->AsyncState);
    try {
        int bytesRead = s->EndReceive(ar);
        String^ read = Encoding::ASCII->GetString(buffer, 0, bytesRead);
        sb->Append(read);
        TimesRead++;

        if (ReadingHeaders == true) {
            Int32 index = sb->ToString()->IndexOf("\r\n\r\n");

            if ((index != -1) && (ContentLength != 0)) {
                TimesRead = 0;
                sb->Remove(0, index + 4);
                ReadingHeaders = false;
            }

            else if (ContentLength == 0) {
                array<String^>^ seperators = gcnew array<String^>{"\r\n", ": "};
                // seperate sb by it's headers
                array<String^>^ headers = sb->ToString()->Split(seperators,StringSplitOptions::None);
                // quick check for Content-Length to be in buffer already
                // and also 10 characters after that
                Int32 index = sb->ToString()->IndexOf("Content-Length:");
                if ((index != -1) && (index + 10 < sb->Length)) {
                    // for loop increments 2 because only the 1st is the header name
                    for (int i = 1; i < headers->Length; i++) {
                        // found correct elements
                        if ((headers[i] == "Content-Length") && (headers[i+1]->ToString() != "")) {
                            Int32::TryParse(headers[i+1]->ToString(), ContentLength);
                            ReadsRequired = (ContentLength / buffer->Length);
                            if (ContentLength % buffer->Length > 0)
                                ReadsRequired++;
                        }
                    }
                }
            }
        }
        if ((ReadingHeaders == true) || (TimesRead < ReadsRequired))
            sock->BeginReceive(buffer, 0, buffer->Length,
                SocketFlags::None, gcnew AsyncCallback(this, &StatsSock::ReceiveDone), sock);
        else
            ParseDelegate->Invoke(sb->ToString(), this);
    }
    catch (Exception^ e) { MessageBox::Show(e->ToString()); }
}

KellyR wrote:

how exactly is the memory allocated

KellyR wrote:

Is a new instance re-allocated each time the function is called

Michael Dunn wrote:

As for which is more efficient, the dominant effect will probably be that the local variable array will already be in the L2 cache