From: Nelson, E. - 2 <eri...@ba...> - 2011-01-31 19:09:31
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> Dean Michael Berris wrote on Saturday, January 29, 2011 8:33 AM > On Sat, Jan 29, 2011 at 7:08 AM, David Hite <dav...@gm...> wrote: >> However, now I have the problem that response.content is a string. >> How do I >> send binary data, such as an image file? >> > > The way I would do it is to somehow mmap the file, get the mmap'ed > pointer, and copy the data into response.content directly. Binary data > is held fine by std::string instances, you just have to reserve the > appropriate amount of memory when you're doing that. > This question will continue to come up. It's true that std::string *can* hold binary data. It's just not *natural*. The std::string interface is strongly influenced by null-terminated strings. Things that the interface implies (like string.c_str() or string(char*) constructor actually do what you'd think) are broken if you use std::string with binary data. The more natural interface (used by asio as well) is a buffer object which is just a tuple of the form {void*, size_t}, which is easily constructed from a string, vector<char>, array, or just about any container that the user has for the data. The user should *not* be forced to make a copy of their data in a std::string just to satisfy the network library. Erik ---------------------------------------------------------------------- This message w/attachments (message) is intended solely for the use of the intended recipient(s) and may contain information that is privileged, confidential or proprietary. If you are not an intended recipient, please notify the sender, and then please delete and destroy all copies and attachments, and be advised that any review or dissemination of, or the taking of any action in reliance on, the information contained in or attached to this message is prohibited. Unless specifically indicated, this message is not an offer to sell or a solicitation of any investment products or other financial product or service, an official confirmation of any transaction, or an official statement of Sender. Subject to applicable law, Sender may intercept, monitor, review and retain e-communications (EC) traveling through its networks/systems and may produce any such EC to regulators, law enforcement, in litigation and as required by law. The laws of the country of each sender/recipient may impact the handling of EC, and EC may be archived, supervised and produced in countries other than the country in which you are located. This message cannot be guaranteed to be secure or free of errors or viruses. References to "Sender" are references to any subsidiary of Bank of America Corporation. Securities and Insurance Products: * Are Not FDIC Insured * Are Not Bank Guaranteed * May Lose Value * Are Not a Bank Deposit * Are Not a Condition to Any Banking Service or Activity * Are Not Insured by Any Federal Government Agency. Attachments that are part of this EC may have additional important disclosures and disclaimers, which you should read. This message is subject to terms available at the following link: http://www.bankofamerica.com/emaildisclaimer. By messaging with Sender you consent to the foregoing. |