date:20090128

XCode Debugger - a couple of questions from newbie

2009-01-28 Thread Alexander Bokovikov


Hi, All,

Please, anybody, help me to understand how this thing works:

I'm trying to set a breakpoint at the main() call in the main.m. I'd like to 
see the arguments. Or maybe there is NS to get them? One way or another, 
my bp doesn't work for some reason. Please take a look at the screenshot, 
made before I click "Build and debug":


http://home.bokovikov.com/etc/mac/xcode/break1.png

It it all OK here? Hope yes. At least my bp is active. Now I'm pressing 
"Build and Debug" and I see this:


http://home.bokovikov.com/etc/mac/xcode/break2.png

What does it mean? Does it mean that my bp is set in a wrong location? What 
this blue frame means? And why? Is it impossible to set a bp within main()? 
Whatever else?


Yet another problem is that I can't set bp within the disassembler view. I 
see the same popup menu, as for source view, but nothing happens when I 
click "Add breakpoint", when I'm in disassembler view. Is it a bug or 
feature or my misunderstanding?


Finally, I see a lot of records in the bp list after all my experiments, and 
many of bp's are located within "asm...", though I never saw them really. 
And I can't empty this window. "Delete" popup menu item does noot work. Can 
I delete all these lines somehow? Please take a look at the screenshot here:


http://home.bokovikov.com/etc/mac/xcode/bplist.png

Thanks in advance.

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Re: Binding Buttons and Popup Menus to NSDictionary made from a prefs plist?

2009-01-28 Thread Ken Thomases


On Jan 26, 2009, at 9:09 AM, Robert Monaghan wrote:


I am trying to wrap my head around using a plist.


When you refer to a "plist", are you referring to a property list data  
structure as it might exist in memory, or a property list file?  Or  
perhaps you're referring to user defaults?


In memory, a property list is just an abstraction.  It's an NSString,  
NSNumber, NSData, NSDate, or a collection (NSArray or NSDictionary)  
containing only theses types.  (For simplicity, I'm eliding mutable  
versions of these types and their Core Foundation equivalents.)



Everything that I have seen on the mailing list so far, involves  
using an NSTableView to work with NSDictionaries.


I'm sure that more reading will turn up lots of other examples that  
don't use NSDictionaries.


Key-Value Coding, Key-Value Observing, and Bindings all deal with  
objects which have properties, which may be referred to by name,  
a.k.a. key.


NSMutableDictionary is useful as a generic object which may have any  
set of properties.  NSMutableDictionary can be nice for some rapid  
prototyping.  However, you'll probably find that it will be  
insufficient for a real application.


The problem with using NSMutableDictionary for your model objects is  
that it's pure data with precious little behavior.  Object-oriented  
programming is about combining data with the operations (behavior)  
that act on it.  Unless your model has no smarts, no "business/domain  
logic", then a dictionary is not going to be sufficient.


So, you should definitely consider replacing your uses of  
NSMutableDictionary with real custom classes that represent your model  
objects.  Sometimes doing so forces thinking about your design that  
exposes problems with it.




Here is what I have set up.
I have several NSButtons and pre-populated NSPopup Buttons, where  
the index values or states are stored as NSNumbers inside a plist  
file. Fairly easy to figure out. You just specify a key, and you get  
an NSNumber Object.


Here you say "plist file", but you can't create bindings to a file.   
So, what's really going on?



I am now trying use several of these plists. I have a list of  
projects in an NSTextColum, each with its own plist. I want to  
select one of the projects in the tableview, and have the controls  
changed to reflect the states from the appropriate plist. Again, in  
theory, plists should work well, here.


NSTextColum?  I'm going to assume you mean a table column with text  
field cell.  From what you're describing -- selecting a row in a table  
updates controls to reflect the selection -- this sounds like a master- 
detail interface.


Yes, "plists" should work well here, in the sense that you can model  
the set of projects using a to-many relationship represented with an  
array, and each element being a dictionary describing a project.


By the way, you haven't described the object having this to-many  
relationship.



So far, I have an NSArrayController working well, with a list of  
projects/plists. However, I can't seem to get the bindings to work  
for the various controls. I am attempting to bind the buttons and  
popup menus to *something" that that can drive them. I not only want  
the controls to be updated with each project that is selected, but  
have the NSDictionary that is holding the plist, to be updated when  
the user changes the controls.


You use the verb "drive" here (and below), but I'm not sure I follow  
what you mean.  You want something to "drive" your buttons and pop-up  
menus? In what sense?  Do what to them?


In the Model-View-Controller (MVC) design pattern, if anything is  
going to act on the views, it would be the controller.  Often though,  
the views "drive" the controller, in the sense of sending action  
messages to it or setting its properties through bindings.  The views  
also get their values from the controller through bindings, built on  
KVO.




Here is what I have tried:
NSDictionaryController.
I have an observeValueForKeyPath set up, to watch my  
NSArrayController, with a list of projects.
Once I have a project selected, it then binds an NSMutableDictionary  
to the NSDictionaryController
Something like this: [seqPrefsCtlr bind:NSContentDictionaryBinding  
toObject:self withKeyPath:@"prefsDict" options:nil];


Honestly, that is clear as mud to me.

Why are you using an NSDictionaryController?  If you're using an  
NSMutableDictionary as a model object, that doesn't necessarily mean  
that an NSDictionaryController is appropriate.  It's only appropriate  
if you need to treat the set of key-value pairs as an array, where the  
keys are not properties but part of the data.  If you're using a  
dictionary as an entity, where its keys are properties, then I don't  
see where NSDictionaryController enters into it.


An NSArrayController is a mediating controller.  There should be a  
coordinating controller somewhere, which you haven't described.  The  
NSArrayController doesn't "own

Re: How to catch and log EXC_BAD_ACCESS?

2009-01-28 Thread Ken Thomases


On Jan 26, 2009, at 5:33 AM, Oleg Krupnov wrote:


For the beta-testing purposes, I'd like my app to handle the situation
when the EXC_BAD_ACCESS exception occurs, and treat it gracefully -
i.e. send a crash report and perhaps terminate.


You might look into NSExceptionHandler, which can do something  
somewhat useful on the way to terminating your app.  Although, really,  
letting Crash Reporter collect the report is probably better.  And, as  
discussed, EXC_BAD_ACCESS/SIGSEGV should lead to terminating your app.


Regards,
Ken

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Re: Is there a more efficient way to get the first 4 bytes off a NSInputStream to compare

2009-01-28 Thread Ken Thomases


On Jan 27, 2009, at 8:23 AM, Adam Venturella wrote:


Will thanks for the heads up, for my purposes this time around, the
input stream will be coming in off the file system, but I did not want
to load the whole thing into an NSData object.


Have you considered NSFileHandle and its -readDataOfLength: method?   
Or for that matter, stdio?


Cheers,
Ken

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Re: Is there a more efficient way to get the first 4 bytes off a NSInputStream to compare

2009-01-28 Thread Jeremy Pereira



On 27 Jan 2009, at 23:07, Graham Cox wrote:



On 28 Jan 2009, at 2:24 am, Jeremy Pereira wrote:

Yes.  That is correct, but since buffer is already a pointer to the  
first byte of the array and then you are taking a reference to it,  
key will end up containing the address of the buffer.  You really  
need:



uint key = *(uint*)buffer;





That's incorrect. Or rather, in this case it doesn't make any  
difference, but the use of '&' is more general as it works whether  
buffer is an array or not.



When you declare:

uint8 buffer[8];

You've reserved 8 bytes on the stack. Whether you use 'buffer' or  
'&buffer' you obtain the same address, as C treats array variables  
as pointers. But:


Having tried it just now, I stand corrected.

However, I would argue that this is the C compiler behaving in a  
deliberately inconsistent way, since in C, arrays and pointers are  
supposed to be the same thing.  As buffer is actually a constant,  
taking its address should really result in a compiler error in the  
same way as int a = &123;







uint8 buffer;

You get very different results from 'buffer' and '&buffer' so in the  
interests of defensive programming, using '&' is allowing your code  
to tolerate a change to the buffer declaration without breaking.  
Because of the additional cast *(int*) such a change would go  
unnoticed by the compiler but probably have a very bad outcome at  
runtime. It's a good habit IMO to always take the address in these  
cases to make it clear in your code what your intentions were when  
you wrote it.


I disagree.  Consider the following program:

---
#include 

int buf[2];

static void foo(int buf1[])
{
printf ("buf1 %08x %08x\n", buf1, &buf1);
}

int main ()
{
unsigned int key = *(unsigned int*)&buf;
printf ("buf  %08x %08x\n", buf, &buf);
foo(buf);
return 0 ;
}
---

If I compile and run it, I get the following output:

buf  2030 2030
buf1 2030 ba00

Clearly if I naively copy and paste

unsigned int key = *(unsigned int*)&buf;

from main to foo and just change the name, I will get the wrong result.




--Graham




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Canvas View really large?

2009-01-28 Thread Rick Langschultz


Hello everyone,

I am developing some drawing software and needed some assistance. I  
have a basic view: TSLabel which is just a small plain view that  
doesn't really do anything - just a rectangle. This rectangle can be  
dragged and moved around it's superview - TSCanvasView which is a  
subclass of a TSZoomView.


Here is my code for a mouseDown: event:

	NSPoint mouseLoc = [self convertPoint:[theEvent locationInWindow]  
fromView:nil];

NSLog(@"Mouse Down at X point: %i", mouseLoc.x);
NSLog(@"Mouse Down at Y point: %i", mouseLoc.y);

My results are pretty large actually, here is the results:
	2009-01-28 02:02:39.548 TestApp[59739:10b] Mouse Down at X point:  
-2089457256
	2009-01-28 02:02:39.549 TestApp[59739:10b] Mouse Down at Y point:  
-2089602536


I suspect it is because I have the canvas displaying a checkerboard  
background that checkerboards the TSCanvasView's drawing.


Can anyone tell me why the X, Y coords are so astronomical? And is  
there any code I should look at. Here are my references:


Sketch.app - Apple Developer Tools / Examples
MySQL Workbench
EFLaceView

Any input, or pointers would be greatly appreciated.

Thanks,
Rick Langschultz
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drag the whole window just by dragging the Image placed on it

2009-01-28 Thread Rahulkumar

 

Few days ago I posted a querry that

 

"I can move a Window i.e. a NSWindow object with the just a simple call
[myWindow setMovableByWindowBackground:TRUE]. This makes window movable from
every point I drag my mouse pointer. Now if I place an NSImage Object over
the window and try to drag the whole window there by only dragging the Image
, it does not works. 

Is there is any way to drag the whole window just by dragging the Image
placed on it?"

 

Any solutions.

Thanks.


 

 

 

 

 

 

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action on double click of image

2009-01-28 Thread Rahulkumar

Hi,

 

I am trying to perform some action on double click of image. Can anybody
suggest me some solution. something which gets called after double clicking
on the

image. any help will be appreciated.

 

Thanks in advance.

 

Regards,

 


PersistentSystemsPrivateLimited

 

P

Rahulkumar Tibdewal | Software Engineer -Telecom| Persistent Systems Ltd.

  rahulkumar_tibde...@persistent.co.in
| Cell: +91 9975582373| Tel: +91 (0712) 398 6107

Innovation in software product design, development and delivery-
 www.persistentsys.com

 

 

Please consider the impact to the environment before printing this email

 

 

 

 

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Multiple NSTabViewItems that can't fit in a Single NSTabView

2009-01-28 Thread Rahulkumar

I want to display Multiple NSTabViewItems that can't fit in a Single
NSTabView. In windows, if tabview items doesn't fit in a tab then they are
displayed by dividing them in 2 lines. Is there anything like this on Mac
platform so that I can display around 10 TabViewItems in a single NSTabView?

 

 

Thanks

 

Regards,

Rahul


 

 

 

 

 

 

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Update your app

2009-01-28 Thread Filip van der Meeren


Good afternoon,

I want to add an updatefunction to my applications, but I am wondering  
how to implement it.
Does someone here have experience with updating your own applications  
without letting the user downloading some parts manually.


Thank you very much,

Filip van der Meeren
fi...@code2develop.com
http://sourceforge.net/projects/xlinterpreter

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Re: Update your app

2009-01-28 Thread Scott Anguish


You want Sparkle.

http://sparkle.andymatuschak.org/

On 28-Jan-09, at 8:43 AM, Filip van der Meeren wrote:


Good afternoon,

I want to add an updatefunction to my applications, but I am  
wondering how to implement it.
Does someone here have experience with updating your own  
applications without letting the user downloading some parts manually.



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Re: action on double click of image

2009-01-28 Thread Mike Abdullah

As a very cursory search with Google would have found you:
http://www.google.com/search?client=safari&rls=en-gb&q=nsimageview+double+click&ie=UTF-8&oe=UTF-8
http://lists.apple.com/archives/Cocoa-dev/2007/Mar/msg00542.html

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