Cocoa mail archive

Fwd: Unit Testing and Run Loops

Jamie Hardt — Sat, 04 Jul 2009 19:31:10 +0100

Thanks, I dimly recall seeing something like this before...

On Jul 4, 2009, at 12:19 PM, A.M. wrote:

>
> On Jul 4, 2009, at 3:10 PM, Jamie Hardt wrote:

>> [...]
>> But does anyone know how to setup something like a stream read or
>> URL download, and make sure run loop completely services the
>> download/stream, and then write a unit test that makes sure all
>> this happens?

>
> NSTimeInterval timeout=3.0;
> while(1)
> {
> NSTimeInterval runtime=[NSDate timeIntervalSinceReferenceDate];
> [[NSRunLoop currentRunLoop] runMode:NSDefaultRunLoopMode beforeDate:
> [NSDate dateWithTimeIntervalSinceNow:t timeout];
> timeout-=[NSDate timeIntervalSinceReferenceDate]-runtime;
> if(mFileDownloaded || timeout<0.0)
> break;
> }
> STAssertTrue(mFileDownloaded==YES,@"File failed to download");
>
> Cheers,
> M
>

Unit Testing and Run Loops

Jamie Hardt — Sat, 04 Jul 2009 19:10:23 +0100

Hello all,

I've looked around for writing about this, but I can't really find
anybody who has declared the absolutely right solution to this problem.

I'm using the SenTesting kit and writing a class that initiates a web
download, async using the run loop. How can I write a unit test that
makes sure that the class completes the download? The test case will
only run once, and threads in the unit test tool don't appear to have
run loops, or if they do, they don't appear to iterate. I've walked
friends through this problem before, and the best solution we came up
with is to rewrite all our code as synchronous but inside and
NSOperation, and then we unit test the operations to make sure they
work, and in the app we run the operations through an operation queue.

But does anyone know how to setup something like a stream read or URL
download, and make sure run loop completely services the download/
stream, and then write a unit test that makes sure all this happens?

Jamie

leaking UIColor objects (correction)

WT — Sat, 04 Jul 2009 13:35:31 +0100

Actually, Leaks reports that my app is leaking UICGColor objects, not
UIColor objects.

leaking UIColor objects

WT — Sat, 04 Jul 2009 13:27:32 +0100

Hello all,

my iPhone OS 3.0 app uses UIColor objects to set the colors of various
objects (text colors of labels, cell view backgrounds, and segmented
control tint colors), but I *never* store any of these colors as
ivars. In other words, I *only* do things like

label.textColor = [UIColor blueColor];

Now, after I installed 3.1 beta, **but still building under 3.0**,
Instruments/Leaks tells me that my app is leaking UIColor objects. My
app was leak-free under 3.0 Leaks.

My conclusion is that Instruments (or, at least, Leaks) has changed
from 3.0 to 3.1 beta. I'm planning to report this as a bug, but I
thought I'd ask the community first, to make sure that this isn't
something I'm overlooking in my own code or elsewhere.

And, yes, I realize that discussing beta releases is a no-no. I'm not
asking for a discussion; I'm merely asking for a "I'm having that
problem too and I've already filed a radar" or "Yes, this looks like a
bug and you should report it" or a "No, it must be something in your
code" kind of response.

Thanks in advance.
Wagner

NSLinkAttributeName: can I control the visual presentation?

Stuart Malin — Sat, 04 Jul 2009 13:18:31 +0100

I have a mutable attributed string that is displayed in an NSTextView.
For a certain range, I set several attributes, including
NSLinkAttributeName. However, the presentation shows as blue
underlined text even though I have set other attributes for the font
color and also have set the underline style to none. Is there
something else I must do to control the visual presentation? Or am I
going to need to use tracking areas and manage this with dynamic
changes?

NSData. add 6 bytes to NSData

Carlo Gulliani — Sat, 04 Jul 2009 11:47:31 +0100

Hi, everybody, I need to add 6 bytes to my NSData

steps:

1. write into NSData

NSData *data = [NSData dataWithBytes:(const char*)&packet length:sizeof(packet)];

2. read from NSData
3. In loop i need to add 6 bytes
4. And again wtite into NSData

first step i did, and from 2 to 4 i dont know how to do. Anybody could help me? Thanks in advance!

looks like my syntax is wrong. Does not compile

Agha Khan — Sat, 04 Jul 2009 04:29:51 +0100

Aobject is type of Myobject*

it has an array for 6 intergers

Aobject.myArray = [NSArray arrayWithObjects:[NSNumber numberWithInt:
1], [NSNumber numberWithInt: 2],[NSNumber numberWithInt:3], [NSNumber
numberWithInt:4], [NSNumber numberWithInt:5],[NSNumber numberWithInt:
6], nil];

Now I would like to randomize it.

for (int j = 0; j < 6; j++)
{
NSNumber* aNumber = [Aobject _Edge] numberWithInt:j;
// looks like my syntax is wrong. Does not compile

}

NSString stringWithFormat: and strings

KK — Sat, 04 Jul 2009 03:20:17 +0100

Hello,
I have a NSString (from a property list file) that has the %@ formats in
it... So.. I do something like this:

NSString *stringFromPlistFile;
NSString *newString = [NSString stringWithFormat:stringFromPlistFile,
@"Hello"];

But that doesn't work...

Keita

Send files from iphone

Development — Sat, 04 Jul 2009 02:20:45 +0100

I need to be able to upload the data from a UIImage to a server via
http POST however I simply cannot find a good example of how to
arrange the headers or how to make this post.
The only data I need to send to the server is the file's name, the
user's name and the data itself and I simply cannot seem to get it to
work. Can any of you offer a helping hand?

Font matching

Gideon King — Sat, 04 Jul 2009 00:13:33 +0100

Hi, I have an application where I need to be able to find the closest
equivalent font should a font be missing. e.g. someone creates a file
and sends it to someone else, who doesn't have the font that was used
to create the original file installed on their system.

I thought that maybe saving the NSFontDescriptor in the file should be
able to allow me to find the best font using the
matchingFontDescriptorsWithMandatoryKeys method passing nil as the
mandatory keys, but I have no idea what it would do if the font was
either there or missing:
- if the font was there, would it return just one font descriptor, or
potentially multiple?
- if it was able to be exactly matched, is there some way of knowing
this (e.g. is isEqual: implemented on NSFontDescriptor?)
- if the font is not there, will it continue to fall back until it
finds a suitable font? If so, will it return only one item in the
array? What does it try to match in the algorithm?
- if it does return multiple descriptors, are they ordered so that I
know which one is considered the best match?
- if I pass in nil as the mandatory keys, will it *always* return at
least one descriptor?

Now sometimes my file is edited by someone using windoze, and the font
name doesn't exactly match what you see on the Mac even though it is
essentially the same font and usually the name of one is a substring
of the other. Is there an elegant way to handle this?

Thanks

Gideon