I'm trying to create a simple C++ class that is able to send an HTTP
request and retrieve the response on OS X (10.2 and later). For
example, suppose the interface for my class looks like this:
class cInternetRequest {
public:
cInternetRequest();
virtual ~cInternetRequest();
bool Open(const char *url);
bool Read(char *buffer, int bytesToRead, int *bytesRead) const;
void Close();
bool GetHttpStatusCode(int *statusCode) const;
... more stuff omitted ...
};
Sample usage of this class might look like:
if (request.Open("www.somedomain.com/example.php")) {
if (request.GetHttpStatusCode(&httpStatus) && httpStatus == 200) {
do {
success = request.Read(buffer, sizeof(buffer), &numBytes);
// ...process response...
} while (success && numBytes > 0);
}
request.Close();
}
It looks like the implementation of this should be pretty
straightforward using CFHTTPMessageCreateRequest() and
CFReadStreamCreateForHTTPRequest(), but there are a few aspects that
Apple's documentation does not seem to cover.
In my Open() method, I would call CFHTTPMessageCreateRequest() to create
the request, then call CFReadStreamCreateForHTTPRequest() and
CFStreamOpen() to actually send the request. Questions:
1) Does CFReadStreamCreateForHTTPRequest() take a "snapshot" of the
CFHTTPMessageRef parameter? In other words, is it safe to CFRelease the
CFHTTPMessageRef immediately after calling
CFReadStreamCreateForHTTPRequest, or does the CFHTTPMessageRef have to
persist until the stream is closed/released?
2) Does CFReadStreamOpen() block until HTTP response headers are
available? If no, how do I know when it's "safe" to call
CFReadStreamCopyProperty() to get the response headers? If
CFReadStreamOpen() DOES block, what happens if there's a network error?
Will it timeout? How long?
Thanks!
Chris
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