Getting progress of HTTP POST as it's being UPLOADED
-
I need to get the status of a POST request as it's being uploaded. I need
this information so that I can display how many bytes have been uploaded so
far, and how many are left to be written.
I've gone as far as to use setHTTPBodyStream, subclassing
NSMutableURLRequest, then overriding the delegate method stream:handleEvent:
so I can track the progress of the stream that way. I did so because
NSURLRequest is supposed to set the delegate of the NSInputStream as itself,
according to the documentation. Even when I attempt this, it seems the
delegate method in my subclass is never called:
#import "VEMutableURLRequest.h"
@implementation VEMutableURLRequest
- (void)stream:(NSStream *)stream handleEvent:(NSStreamEvent)eventCode {
NSLog(@"Stream Event!!");
}
- (void)setHTTPBodyStream:(NSInputStream *)inputStream {
[super setHTTPBodyStream:inputStream];
[[self HTTPBodyStream] setDelegate:self];
NSLog(@"setHTTPBodyStream done");
NSLog(@"delegate of Stream: %@", [[[self HTTPBodyStream] delegate]
className]);
}
@end
The console does show the log information for setHTTPBodyStream:, but it
does not show any log information for stream:handleEvent:. I am loading the
request this way:
NSURLResponse* response;
NSError* error;
NSData* result = [NSURLConnection sendSynchronousRequest:postRequest
returningResponse:&response error:&error];
The POST request is sent correctly, and there's no hitch in the
communication with the server. My only problem is that I can't seem to get
any delegate messages from the HTTPBodyStream.
Please, if anyone could please help me with this problem, I would really,
really appreciate it. Is this even possible with NSURLRequest? If not, how
would I go about doing so using a different framework (such as CURLHandle)?
Thanks in advance.
Daniel -
Daniel,> I need to get the status of a POST request as it's being uploaded.
> I need
> this information so that I can display how many bytes have been
> uploaded so
> far, and how many are left to be written.
>
This is what I've done....
Setup CFHTTPRequest using CFHTTPMessageCreateRequest and associated
functions such as CFHTTPMessageSetHeaderFieldValue,
CFReadStreamCreateWithFile,
CFReadStreamCreateForStreamedHTTPRequest, etc
To get the bytes uploaded, create a timer and call the following
periodically during the upload:
CFNumberRef byteCount = (CFNumberRef)CFReadStreamCopyProperty
(httpReqStream, kCFStreamPropertyHTTPRequestBytesWrittenCount);
this doesn't quite give exactly what we want as it returns the bytes
written to the kernel buffer, not the bytes as they are transmitted
from the buffer.
So your first read of this property will give something like 32k or
64k when the buffer is initially filled, then will increase as the
data is transmitted and the buffer refilled.>
> Please, if anyone could please help me with this problem, I would
> really,
> really appreciate it. Is this even possible with NSURLRequest? If
> not, how
> would I go about doing so using a different framework (such as
> CURLHandle)?
>
> Thanks in advance.
>
> Daniel
>
I'm pretty sure the progress can't be obtained using NSURLRequest. I
tried - I just can't remember why. So definitely use the CFHTTP.....
set of methods.
Cheers
Gary -
Thanks a lot for your comments, I really appreciate it. Unfortunately, I
don't have much experience working with the Core Foundation, especially with
its networking functions. Do you happen to have some sample code that would
show setting up a basic request, obtaining the stream, and then getting the
byte count? I can't seem to find the
CFReadStreamCreateForStreamedHTTPRequest function, and I'm not sure if I can
make heads or tails of HTTP requests using CF.
If you or anyone could please give me some more hints, it would be a huge
help. Thanks for your advice thus far.
Daniel
On 8/30/06, Gary Fielke <gary...> wrote:>
> Daniel,
>
>> I need to get the status of a POST request as it's being uploaded.
>> I need
>> this information so that I can display how many bytes have been
>> uploaded so
>> far, and how many are left to be written.
>>
>
> This is what I've done....
>
> Setup CFHTTPRequest using CFHTTPMessageCreateRequest and associated
> functions such as CFHTTPMessageSetHeaderFieldValue,
> CFReadStreamCreateWithFile,
> CFReadStreamCreateForStreamedHTTPRequest, etc
>
> To get the bytes uploaded, create a timer and call the following
> periodically during the upload:
>
> CFNumberRef byteCount =
> (CFNumberRef)CFReadStreamCopyProperty
> (httpReqStream, kCFStreamPropertyHTTPRequestBytesWrittenCount);
>
> this doesn't quite give exactly what we want as it returns the bytes
> written to the kernel buffer, not the bytes as they are transmitted
> from the buffer.
> So your first read of this property will give something like 32k or
> 64k when the buffer is initially filled, then will increase as the
> data is transmitted and the buffer refilled.
>
>>
>> Please, if anyone could please help me with this problem, I would
>> really,
>> really appreciate it. Is this even possible with NSURLRequest? If
>> not, how
>> would I go about doing so using a different framework (such as
>> CURLHandle)?
>>
>> Thanks in advance.
>>
>> Daniel
>>
>
> I'm pretty sure the progress can't be obtained using NSURLRequest. I
> tried - I just can't remember why. So definitely use the CFHTTP.....
> set of methods.
>
> Cheers
> Gary
>
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--
Daniel Kurtz
Phone: (508)789-8048
Dual BS in Computer Science and Cognitive Psychology
College of Computer and Information Science
Northeastern University, Boston, MA, USA -
Daniel,
Yes, the docs for CFReadStreamCreateForStreamedHTTPRequest are not
exactly easy to find!
Cmd-double-leftclick on the function in XCode will open
CFHTTPStream.h with some notes on it.
Do a search for this function on the networking list and you'll find
some tips - such as this one:
http://lists.apple.com/archives/Macnetworkprog/2005/Dec/msg00066.html
Before that though, start with the CFNetwork Programming Guide:
http://developer.apple.com/documentation/Networking/Conceptual/
CFNetwork/index.html
There's plenty of sample code there to get started including creating
and setting up a request.
Cheers
Gary> Thanks a lot for your comments, I really appreciate it.
> Unfortunately, I
> don't have much experience working with the Core Foundation,
> especially with
> its networking functions. Do you happen to have some sample code
> that would
> show setting up a basic request, obtaining the stream, and then
> getting the
> byte count? I can't seem to find the
> CFReadStreamCreateForStreamedHTTPRequest function, and I'm not sure
> if I can
> make heads or tails of HTTP requests using CF.
>
> If you or anyone could please give me some more hints, it would be
> a huge
> help. Thanks for your advice thus far.
>
> Daniel
>
>
> On 8/30/06, Gary Fielke <gary...> wrote:
>>
>> Daniel,
>>
>>> I need to get the status of a POST request as it's being uploaded.
>>> I need
>>> this information so that I can display how many bytes have been
>>> uploaded so
>>> far, and how many are left to be written.
>>>
>>
>> This is what I've done....
>>
>> Setup CFHTTPRequest using CFHTTPMessageCreateRequest and associated
>> functions such as CFHTTPMessageSetHeaderFieldValue,
>> CFReadStreamCreateWithFile,
>> CFReadStreamCreateForStreamedHTTPRequest, etc
>>
>> To get the bytes uploaded, create a timer and call the following
>> periodically during the upload:
>>
>> CFNumberRef byteCount =
>> (CFNumberRef)CFReadStreamCopyProperty
>> (httpReqStream, kCFStreamPropertyHTTPRequestBytesWrittenCount);
>>
>> this doesn't quite give exactly what we want as it returns the bytes
>> written to the kernel buffer, not the bytes as they are transmitted
>> from the buffer.
>> So your first read of this property will give something like 32k or
>> 64k when the buffer is initially filled, then will increase as the
>> data is transmitted and the buffer refilled. -
> I need to get the status of a POST request as it's being uploaded.
> I need
> this information so that I can display how many bytes have been
> uploaded so
> far, and how many are left to be written.
You might be interested in some old code I wrote for exactly that
purpose, feel free to take everything you want.
http://dev.lorem-ipsum.at/LIHTTPUpload.h
http://dev.lorem-ipsum.at/LIHTTPUpload.m
To be honest, I am not perfectly sure if you could answer questions
for the code,
I never used in production (it was more of a experiment) it but it
worked quite good.
Yours,
Ferdinand
