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2014/10/15 ¤U¤È 10:05:05
iphone Programming Glossary: charRetrieving a pixel alpha value for a UIImage http://stackoverflow.com/questions/1042830/retrieving-a-pixel-alpha-value-for-a-uiimage from the UIImageView. int byteIndex bytesPerRow uiViewPoint.y uiViewPoint.x bytesPerPixel unsigned char alpha rawData byteIndex 3 However I don't get the values I expect. For a completely black transparent..
Detect the specific iPhone/iPod touch model [duplicate] http://stackoverflow.com/questions/1108859/detect-the-specific-iphone-ipod-touch-model 1G iPod2 1 iPod touch 2G 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..
AES Encryption for an NSString on the iPhone http://stackoverflow.com/questions/1400246/aes-encryption-for-an-nsstring-on-the-iphone points in a real application it wouldn't make sense to print such values. int main int argc const char argv NSAutoreleasePool pool NSAutoreleasePool alloc init NSString key @ my password NSString secret..
How to get the RGB values for a pixel on an image on the iphone http://stackoverflow.com/questions/144250/how-to-get-the-rgb-values-for-a-pixel-on-an-image-on-the-iphone Read Only Data Previous information method 2 Step 1. I declared a type for byte typedef unsigned char byte Step 2. I declared a struct to correspond to a pixel typedef struct RGBPixel byte red byte green..
Objective-c iPhone percent encode a string? http://stackoverflow.com/questions/3423545/objective-c-iphone-percent-encode-a-string get the percent encoded string for these specific letters how to do that in objective c Reserved characters after percent encoding ' @ # 21 2A 27 28 29 3B 3A 40 26 3D 2B 24 2C 2F 3F 23 5B 5D Percent encoding.. and CFURLCreateStringByAddingPercentEscapes are inadequate. The NSString method misses quite a few characters and the CF function only lets you say which specific characters you want to escape. The proper.. NSString method misses quite a few characters and the CF function only lets you say which specific characters you want to escape. The proper specification is to escape all characters except a small set. To..
Get PDF hyperlinks on iOS with Quartz http://stackoverflow.com/questions/4080373/get-pdf-hyperlinks-on-ios-with-quartz coord if CGPDFObjectGetValue rectObj kCGPDFObjectTypeReal coord return coords k coord char uriString char CGPDFStringGetBytePtr uriStringRef NSString uri NSString stringWithCString uriString.. if CGPDFObjectGetValue rectObj kCGPDFObjectTypeReal coord return coords k coord char uriString char CGPDFStringGetBytePtr uriStringRef NSString uri NSString stringWithCString uriString encoding NSUTF8StringEncoding..
iOS SDK - Programmatically generate a PDF file http://stackoverflow.com/questions/4362734/ios-sdk-programmatically-generate-a-pdf-file calculate where lines and other objects will be placed. void CreatePDFFile CGRect pageRect const char filename This code block sets up our PDF Context so that we can draw to it CGContextRef pdfContext.. pageRect.size.height 100 This code block will create an image that we then draw to the page const char picture Picture CGImageRef image CGDataProviderRef provider CFStringRef picturePath CFURLRef pictureURL.. pdfContext kCGTextFill CGContextSetRGBFillColor pdfContext 0 0 0 1 const char text Hello World CGContextShowTextAtPoint pdfContext 260 390 text strlen text End text We are done drawing..
Subclass UIButton to add a property http://stackoverflow.com/questions/5500327/subclass-uibutton-to-add-a-property #import UIButton Property.h #import objc runtime.h @implementation UIButton Property static char UIB_PROPERTY_KEY @dynamic property void setProperty NSObject property objc_setAssociatedObject self..
http://stackoverflow.com/questions/5619719/write-a-file-on-ios do I write a file on iOS I'm trying to do it with the following code but I'm doing something wrong char saves abcd NSData data NSData alloc initWithBytes saves length 4 NSArray paths NSSearchPathForDirectoriesInDomains..
performSelector may cause a leak because its selector is unknown http://stackoverflow.com/questions/7017281/performselector-may-cause-a-leak-because-its-selector-is-unknown what to do with the result of the method you're calling. The result could be anything void int char NSString id etc. ARC normally gets this information from the header of the object type you're working..
http://stackoverflow.com/questions/8088473/url-encode-an-nsstring stringByAddingPercentEscapesUsingEncoding doesn't always work 100 . It encodes non URL characters but leaves the reserved characters like slash and ampersand alone. Apparently this is a bug that.. doesn't always work 100 . It encodes non URL characters but leaves the reserved characters like slash and ampersand alone. Apparently this is a bug that Apple is aware of but since they.. NSString_Extended NSString urlencode NSMutableString output NSMutableString string const unsigned char source const unsigned char self UTF8String int sourceLen strlen const char source for int i 0 i sourceLen..
Retrieving a pixel alpha value for a UIImage http://stackoverflow.com/questions/1042830/retrieving-a-pixel-alpha-value-for-a-uiimage index for the given alpha channel using the coordinates from the UIImageView. int byteIndex bytesPerRow uiViewPoint.y uiViewPoint.x bytesPerPixel unsigned char alpha rawData byteIndex 3 However I don't get the values I expect. For a completely black transparent area of the image I get non zero values for the alpha channel...
Detect the specific iPhone/iPod touch model [duplicate] http://stackoverflow.com/questions/1108859/detect-the-specific-iphone-ipod-touch-model iPhone1 1 iPhone 1G iPhone1 2 iPhone 3G iPod1 1 iPod touch 1G iPod2 1 iPod touch 2G 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 encoding NSUTF8StringEncoding free machine..
AES Encryption for an NSString on the iPhone http://stackoverflow.com/questions/1400246/aes-encryption-for-an-nsstring-on-the-iphone are only for demonstrating the state of the data at various points in a real application it wouldn't make sense to print such values. int main int argc const char argv NSAutoreleasePool pool NSAutoreleasePool alloc init NSString key @ my password NSString secret @ text to encrypt NSData plain secret dataUsingEncoding NSUTF8StringEncoding..
How to get the RGB values for a pixel on an image on the iphone http://stackoverflow.com/questions/144250/how-to-get-the-rgb-values-for-a-pixel-on-an-image-on-the-iphone RGBAPixel CGBitmapContextGetData context return pixelData Read Only Data Previous information method 2 Step 1. I declared a type for byte typedef unsigned char byte Step 2. I declared a struct to correspond to a pixel typedef struct RGBPixel byte red byte green byte blue RGBPixel Step 3. I subclassed UIImageView and declared..
Objective-c iPhone percent encode a string? http://stackoverflow.com/questions/3423545/objective-c-iphone-percent-encode-a-string c iPhone percent encode a string I would like to get the percent encoded string for these specific letters how to do that in objective c Reserved characters after percent encoding ' @ # 21 2A 27 28 29 3B 3A 40 26 3D 2B 24 2C 2F 3F 23 5B 5D Percent encoding wiki Please test with this string and see if it do work.. found that both stringByAddingPercentEscapesUsingEncoding and CFURLCreateStringByAddingPercentEscapes are inadequate. The NSString method misses quite a few characters and the CF function only lets you say which specific characters you want to escape. The proper specification is to escape all characters except a small set... CFURLCreateStringByAddingPercentEscapes are inadequate. The NSString method misses quite a few characters and the CF function only lets you say which specific characters you want to escape. The proper specification is to escape all characters except a small set. To fix this I created an NSString category method to properly..
Get PDF hyperlinks on iOS with Quartz http://stackoverflow.com/questions/4080373/get-pdf-hyperlinks-on-ios-with-quartz if CGPDFArrayGetObject rectArray k rectObj return CGPDFReal coord if CGPDFObjectGetValue rectObj kCGPDFObjectTypeReal coord return coords k coord char uriString char CGPDFStringGetBytePtr uriStringRef NSString uri NSString stringWithCString uriString encoding NSUTF8StringEncoding CGRect rect CGRectMake coords.. rectArray k rectObj return CGPDFReal coord if CGPDFObjectGetValue rectObj kCGPDFObjectTypeReal coord return coords k coord char uriString char CGPDFStringGetBytePtr uriStringRef NSString uri NSString stringWithCString uriString encoding NSUTF8StringEncoding CGRect rect CGRectMake coords 0 coords 1 coords..
iOS SDK - Programmatically generate a PDF file http://stackoverflow.com/questions/4362734/ios-sdk-programmatically-generate-a-pdf-file seems like a ridiculous way to write to a PDF file having to calculate where lines and other objects will be placed. void CreatePDFFile CGRect pageRect const char filename This code block sets up our PDF Context so that we can draw to it CGContextRef pdfContext CFStringRef path CFURLRef url CFMutableDictionaryRef myDictionary.. pdfContext CGRectMake 50 50 pageRect.size.width 100 pageRect.size.height 100 This code block will create an image that we then draw to the page const char picture Picture CGImageRef image CGDataProviderRef provider CFStringRef picturePath CFURLRef pictureURL picturePath CFStringCreateWithCString NULL picture kCFStringEncodingUTF8.. pdfContext Helvetica 16 kCGEncodingMacRoman CGContextSetTextDrawingMode pdfContext kCGTextFill CGContextSetRGBFillColor pdfContext 0 0 0 1 const char text Hello World CGContextShowTextAtPoint pdfContext 260 390 text strlen text End text We are done drawing to this page let's end it We could add as many pages..
Subclass UIButton to add a property http://stackoverflow.com/questions/5500327/subclass-uibutton-to-add-a-property nonatomic retain NSObject property @end UIButton Property.m #import UIButton Property.h #import objc runtime.h @implementation UIButton Property static char UIB_PROPERTY_KEY @dynamic property void setProperty NSObject property objc_setAssociatedObject self UIB_PROPERTY_KEY property OBJC_ASSOCIATION_RETAIN_NONATOMIC..
http://stackoverflow.com/questions/5619719/write-a-file-on-ios a file on iOS How do I write a file on iOS I'm trying to do it with the following code but I'm doing something wrong char saves abcd NSData data NSData alloc initWithBytes saves length 4 NSArray paths NSSearchPathForDirectoriesInDomains NSDocumentDirectory NSUserDomainMask YES NSString..
performSelector may cause a leak because its selector is unknown http://stackoverflow.com/questions/7017281/performselector-may-cause-a-leak-because-its-selector-is-unknown for this warning is that with ARC the runtime needs to know what to do with the result of the method you're calling. The result could be anything void int char NSString id etc. ARC normally gets this information from the header of the object type you're working with. 2 There are really only 4 things that ARC would consider..
http://stackoverflow.com/questions/8088473/url-encode-an-nsstring iphone objective c ipad share improve this question Unfortunately stringByAddingPercentEscapesUsingEncoding doesn't always work 100 . It encodes non URL characters but leaves the reserved characters like slash and ampersand alone. Apparently this is a bug that Apple is aware of but since they have not fixed it yet I.. this question Unfortunately stringByAddingPercentEscapesUsingEncoding doesn't always work 100 . It encodes non URL characters but leaves the reserved characters like slash and ampersand alone. Apparently this is a bug that Apple is aware of but since they have not fixed it yet I have been using this category to url.. category to url encode a string @implementation NSString NSString_Extended NSString urlencode NSMutableString output NSMutableString string const unsigned char source const unsigned char self UTF8String int sourceLen strlen const char source for int i 0 i sourceLen i const unsigned char thisChar source i if thisChar '..
Retrieving a pixel alpha value for a UIImage http://stackoverflow.com/questions/1042830/retrieving-a-pixel-alpha-value-for-a-uiimage the coordinates from the UIImageView. int byteIndex bytesPerRow uiViewPoint.y uiViewPoint.x bytesPerPixel unsigned char alpha rawData byteIndex 3 However I don't get the values I expect. For a completely black transparent area of the image..
Detect the specific iPhone/iPod touch model [duplicate] http://stackoverflow.com/questions/1108859/detect-the-specific-iphone-ipod-touch-model 3G iPod1 1 iPod touch 1G iPod2 1 iPod touch 2G 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 encoding..
AES Encryption for an NSString on the iPhone http://stackoverflow.com/questions/1400246/aes-encryption-for-an-nsstring-on-the-iphone the data at various points in a real application it wouldn't make sense to print such values. int main int argc const char argv NSAutoreleasePool pool NSAutoreleasePool alloc init NSString key @ my password NSString secret @ text to encrypt NSData..
How to get the RGB values for a pixel on an image on the iphone http://stackoverflow.com/questions/144250/how-to-get-the-rgb-values-for-a-pixel-on-an-image-on-the-iphone return pixelData Read Only Data Previous information method 2 Step 1. I declared a type for byte typedef unsigned char byte Step 2. I declared a struct to correspond to a pixel typedef struct RGBPixel byte red byte green byte blue RGBPixel..
Objective-c iPhone percent encode a string? http://stackoverflow.com/questions/3423545/objective-c-iphone-percent-encode-a-string I would like to get the percent encoded string for these specific letters how to do that in objective c Reserved characters after percent encoding ' @ # 21 2A 27 28 29 3B 3A 40 26 3D 2B 24 2C 2F 3F 23 5B 5D Percent encoding wiki Please.. and CFURLCreateStringByAddingPercentEscapes are inadequate. The NSString method misses quite a few characters and the CF function only lets you say which specific characters you want to escape. The proper specification is to.. are inadequate. The NSString method misses quite a few characters and the CF function only lets you say which specific characters you want to escape. The proper specification is to escape all characters except a small set. To fix this I created..
Get PDF hyperlinks on iOS with Quartz http://stackoverflow.com/questions/4080373/get-pdf-hyperlinks-on-ios-with-quartz k rectObj return CGPDFReal coord if CGPDFObjectGetValue rectObj kCGPDFObjectTypeReal coord return coords k coord char uriString char CGPDFStringGetBytePtr uriStringRef NSString uri NSString stringWithCString uriString encoding NSUTF8StringEncoding.. CGPDFReal coord if CGPDFObjectGetValue rectObj kCGPDFObjectTypeReal coord return coords k coord char uriString char CGPDFStringGetBytePtr uriStringRef NSString uri NSString stringWithCString uriString encoding NSUTF8StringEncoding CGRect..
iOS SDK - Programmatically generate a PDF file http://stackoverflow.com/questions/4362734/ios-sdk-programmatically-generate-a-pdf-file a PDF file having to calculate where lines and other objects will be placed. void CreatePDFFile CGRect pageRect const char filename This code block sets up our PDF Context so that we can draw to it CGContextRef pdfContext CFStringRef path CFURLRef.. 100 pageRect.size.height 100 This code block will create an image that we then draw to the page const char picture Picture CGImageRef image CGDataProviderRef provider CFStringRef picturePath CFURLRef pictureURL picturePath CFStringCreateWithCString.. CGContextSetTextDrawingMode pdfContext kCGTextFill CGContextSetRGBFillColor pdfContext 0 0 0 1 const char text Hello World CGContextShowTextAtPoint pdfContext 260 390 text strlen text End text We are done drawing to this page..
Subclass UIButton to add a property http://stackoverflow.com/questions/5500327/subclass-uibutton-to-add-a-property @end UIButton Property.m #import UIButton Property.h #import objc runtime.h @implementation UIButton Property static char UIB_PROPERTY_KEY @dynamic property void setProperty NSObject property objc_setAssociatedObject self UIB_PROPERTY_KEY property..
http://stackoverflow.com/questions/5619719/write-a-file-on-ios a file on iOS How do I write a file on iOS I'm trying to do it with the following code but I'm doing something wrong char saves abcd NSData data NSData alloc initWithBytes saves length 4 NSArray paths NSSearchPathForDirectoriesInDomains NSDocumentDirectory..
performSelector may cause a leak because its selector is unknown http://stackoverflow.com/questions/7017281/performselector-may-cause-a-leak-because-its-selector-is-unknown runtime needs to know what to do with the result of the method you're calling. The result could be anything void int char NSString id etc. ARC normally gets this information from the header of the object type you're working with. 2 There are..
http://stackoverflow.com/questions/8088473/url-encode-an-nsstring this question Unfortunately stringByAddingPercentEscapesUsingEncoding doesn't always work 100 . It encodes non URL characters but leaves the reserved characters like slash and ampersand alone. Apparently this is a bug that Apple is aware of.. doesn't always work 100 . It encodes non URL characters but leaves the reserved characters like slash and ampersand alone. Apparently this is a bug that Apple is aware of but since they have not fixed it yet.. NSString NSString_Extended NSString urlencode NSMutableString output NSMutableString string const unsigned char source const unsigned char self UTF8String int sourceLen strlen const char source for int i 0 i sourceLen i const unsigned..
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