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判别I(xi��n)OS�q�行�q�_��

momor — Thu, 19 Aug 2010 09:05:00 GMT

本来�q�是QQ��里一个朋友的问题�Q�网上查了一下，现在��方法大概整理一下，以便于需要的朋友使用。当�Ӟ��使用

UIDevice�c�，也可以简单的获得到底当前�q�_��是iphone �q�是itouch,但是你所获得的信息也��׃��限于此了�Q�如果想获得更多�?/div>

��g�q�_��信息呢？使用sysctlbyname�Q�即可�?/div>

获取当前的��^��C��息，需要查询hw.machine ��|��q�回��gؓ(f��)以下字符�Ԍ��(x��)

iPhone1,1 (iphone一�?

iPhone1,2 (iphone 3G)

iPhone2,1 (iphone 3Gs)

iPhone3,1 (Iphone 4)

iPod1,1 (iPod Touch 1�?

iPod2,1 (iPod Touch 2�?

iPod3,1 (iPod Touch 3�?

i386 (模拟�?

使用�Ҏ(gu��)��Q?/div>

UIDeviceHardware *h=[[UIDeviceHardware alloc] init];

[self setDeviceModel:[h platformString]];

[h release];

UIDeviceHardware.h 头文�?/div>

// UIDeviceHardware.h

// Used to determine EXACT version of device software is running on.

#import

@interface UIDeviceHardware : NSObject

- (NSString *) platform;

- (NSString *) platformString;

@end

UIDeviceHardware.m 实现文�g

// UIDeviceHardware.m

// Used to determine EXACT version of device software is running on.

#import "UIDeviceHardware.h"

#include

@implementation UIDeviceHardware

- (NSString *) platform{

size_t size;

sysctlbyname("hw.machine", NULL, &size, NULL, 0);

char *machine = malloc(size);

sysctlbyname("hw.machine", machine, &size, NULL, 0);

NSString *platform = [NSString stringWithCString:machine];

free(machine);

return platform;

}

- (NSString *) platformString{

NSString *platform = [self platform];

if ([platform isEqualToString:@"iPhone1,1"]) return @"iPhone 1G";

if ([platform isEqualToString:@"iPhone1,2"]) return @"iPhone 3G";

if ([platform isEqualToString:@"iPhone2,1"]) return @"iPhone 3GS";

if ([platform isEqualToString:@"iPhone3,1"]) return @"iPhone 4";

if ([platform isEqualToString:@"iPod1,1"]) return @"iPod Touch 1G";

if ([platform isEqualToString:@"iPod2,1"]) return @"iPod Touch 2G";

if ([platform isEqualToString:@"iPod3,1"]) return @"iPod Touch 3G";

if ([platform isEqualToString:@"i386"]) return @"iPhone Simulator";

return platform;

}

@end

momor 2010-08-19 17:05 发表评论

iPhone OpenGL Speed Tip �?Turn Off Thumb Instructions

momor — Tue, 13 Apr 2010 09:01:00 GMT

Want to boost your iPhone OpenGL app’s framerate with one checkbox? It’s easy; turn off Thumb instructions.

What are Thumb instructions?

The iPhone uses the ARM 1176JZ processor, and Thumb instructions are 16-bit versions of common 32-bit ARM instructions. By default, your Xcode project will compile with Thumb instructions.

Why use Thumb instructions?

On embedded systems like the iPhone (or any system, really, but here especially), you have to think about the space your app uses. Smaller instructions mean smaller code in memory and on disk. That’s a good thing! However, there’s a trade-off: performance.

According to Apple, the cost comes from floating-point operations. Ripping out the GLfloats from your app isn’t the way to go, so let’s learn a better way.

How do I turn off Thumb instructions?

Here’s what to do in Xcode:

Open your project
Choose Project -> Edit Project Settings
In the Project Info window, choose the Build tab
In the search box, type “thumb“
You should see a “Compile for Thumb” setting. Uncheck it. (Click image to enlarge.)
Clean and rebuild your project.

That’s it! If you don’t have the setting, make sure the Active SDK is set to Device. The setting isn’t applicable to the Simulator.

What kind of frame rate boost will I see?

I had improvements of around 20, 30, and 50%. Hopefully you will see even bigger ones!

momor 2010-04-13 17:01 发表评论

重力感应

momor — Wed, 13 May 2009 06:10:00 GMT

momor 2009-05-13 14:10 发表评论

momor — Wed, 08 Apr 2009 01:48:00 GMT

��介：(x��)

本书主要介绍了Unix�pȝ��领域中的设计和开发哲学、思想文化体系、原则与�l�验�Q�由公认的Unix�~�程大师、开源运动领袖�h物之一Eric S. Raymond們֊�多年写作而成。包括Unix设计者在内的多位领域专家也�ؓ(f��)本书贡献了宝�늚�内容。本书内�Ҏ(gu��)��?qi��ng)社��文化、��Y件开发设计与实现�Q�覆盖面 �qѝ��内�Ҏ(gu��)��邃，完全展现了作者极其深厚的�l�验�U�篏和领域智慧�?br>
另据�Q�http://www.huachu.com.cn/2005/2005unix.htm

作者简介：(x��)

　姜宏�Q��Y件工�E�师�Q�目前从事协同应用��^��C��设计与开发。技术兴��包括Windows 驱动�E�序开发﹑泛型�~�程。和侯捷、荣耀共同��译了《C++ Templates 中文版》�?br>

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一直都听说�q�本书，只是没有��Z��(x��)读过�Q�据说媄响力不小�Q�网上对它的评�h(hu��n)也是褒贬不一�Q�有人抨��d��?y��u)��Unix文化宗教化，也有人希望能够冲破世俗，从已�l�� ?0多年的操作系�l�上�H�查恒久的设计哲学。到底我们需要的是什么，大概只有读过�q�本书以后，才能够去评述。这个世界很��躁�Q�华丽的充斥着我们�Q�迷��q��? 西太多，希望更多的思考角度和方式�?br>

momor 2009-04-08 09:48 发表评论