iphone Programming Glossary: byte

Retrieving a pixel alpha value for a UIImage

http://stackoverflow.com/questions/1042830/retrieving-a-pixel-alpha-value-for-a-uiimage

of a pixel in a UIImageView. I have obtained the CGImage from UIImageView image and created a RGBA byte array from this. Alpha is premultiplied. CGImageRef image uiImage.CGImage NSUInteger width CGImageGetWidth.. image CGColorSpaceRef colorSpace CGColorSpaceCreateDeviceRGB rawData malloc height width 4 bytesPerPixel 4 bytesPerRow bytesPerPixel width NSUInteger bitsPerComponent 8 CGContextRef context CGBitmapContextCreate.. colorSpace CGColorSpaceCreateDeviceRGB rawData malloc height width 4 bytesPerPixel 4 bytesPerRow bytesPerPixel width NSUInteger bitsPerComponent 8 CGContextRef context CGBitmapContextCreate..

HTML character decoding in Objective-C / Cocoa Touch

http://stackoverflow.com/questions/1105169/html-character-decoding-in-objective-c-cocoa-touch

# number they are called numeric entity references . Basically it's a string representation of the byte that should be substituted. In the case of #038 it represents the character with the value of 38 in.. special character. What you need to do is parse the string and replace the entities with a byte matching the value between # and . I don't know of any great ways to do this in objective C but this..

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

#define RGBA 4 #define RGBA_8_BIT 8 In my UIImage subclass I declared instance variables size_t bytesPerRow size_t byteCount size_t pixelCount CGContextRef context CGColorSpaceRef colorSpace UInt8 pixelByteData.. RGBA_8_BIT 8 In my UIImage subclass I declared instance variables size_t bytesPerRow size_t byteCount size_t pixelCount CGContextRef context CGColorSpaceRef colorSpace UInt8 pixelByteData A pointer.. CGContextRef context CGColorSpaceRef colorSpace UInt8 pixelByteData A pointer to an array of RGBA bytes in memory RPVW_RGBAPixel pixelData The pixel struct with alpha in this version typedef struct RGBAPixel..

AES interoperability between .Net and iPhone?

http://stackoverflow.com/questions/538435/aes-interoperability-between-net-and-iphone

IV . The .Net code uses the key for IV. private static AesCryptoServiceProvider GetProvider byte key Set up the encryption objects AesCryptoServiceProvider result new AesCryptoServiceProvider byte.. key Set up the encryption objects AesCryptoServiceProvider result new AesCryptoServiceProvider byte RealKey Encryptor.GetKey key result result.Key RealKey result.IV RealKey return result and private static.. Encryptor.GetKey key result result.Key RealKey result.IV RealKey return result and private static byte GetKey byte suggestedKey AesCryptoServiceProvider p byte kRaw suggestedKey List kList new List for int..

How to convert NSData to byte array in iPhone?

http://stackoverflow.com/questions/724086/how-to-convert-nsdata-to-byte-array-in-iphone

to convert NSData to byte array in iPhone I want to convert NSData to a byte array so I write the following code NSData data.. to convert NSData to byte array in iPhone I want to convert NSData to a byte array so I write the following code NSData data NSData dataWithContentsOfFile filePath int len data.. the following code NSData data NSData dataWithContentsOfFile filePath int len data length Byte byteData len byteData data bytes But the last line of code pops up an error saying incompatible types in..

Retrieving a pixel alpha value for a UIImage

http://stackoverflow.com/questions/1042830/retrieving-a-pixel-alpha-value-for-a-uiimage

a UIImage I am currently trying to obtain the alpha value of a pixel in a UIImageView. I have obtained the CGImage from UIImageView image and created a RGBA byte array from this. Alpha is premultiplied. CGImageRef image uiImage.CGImage NSUInteger width CGImageGetWidth image NSUInteger height CGImageGetHeight image CGColorSpaceRef.. width CGImageGetWidth image NSUInteger height CGImageGetHeight image CGColorSpaceRef colorSpace CGColorSpaceCreateDeviceRGB rawData malloc height width 4 bytesPerPixel 4 bytesPerRow bytesPerPixel width NSUInteger bitsPerComponent 8 CGContextRef context CGBitmapContextCreate rawData width height bitsPerComponent bytesPerRow.. image NSUInteger height CGImageGetHeight image CGColorSpaceRef colorSpace CGColorSpaceCreateDeviceRGB rawData malloc height width 4 bytesPerPixel 4 bytesPerRow bytesPerPixel width NSUInteger bitsPerComponent 8 CGContextRef context CGBitmapContextCreate rawData width height bitsPerComponent bytesPerRow colorSpace..

HTML character decoding in Objective-C / Cocoa Touch

http://stackoverflow.com/questions/1105169/html-character-decoding-in-objective-c-cocoa-touch

Character Entity References . When they take the form of # number they are called numeric entity references . Basically it's a string representation of the byte that should be substituted. In the case of #038 it represents the character with the value of 38 in the ISO 8859 1 character encoding scheme which is . The reason.. reason the ampersand has to be encoded in RSS is it's a reserved special character. What you need to do is parse the string and replace the entities with a byte matching the value between # and . I don't know of any great ways to do this in objective C but this stack overflow question might be of some help. Edit Since answering..

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

data . Method 1 Writable Pixel Information I defined constants #define RGBA 4 #define RGBA_8_BIT 8 In my UIImage subclass I declared instance variables size_t bytesPerRow size_t byteCount size_t pixelCount CGContextRef context CGColorSpaceRef colorSpace UInt8 pixelByteData A pointer to an array of RGBA bytes in memory RPVW_RGBAPixel.. Pixel Information I defined constants #define RGBA 4 #define RGBA_8_BIT 8 In my UIImage subclass I declared instance variables size_t bytesPerRow size_t byteCount size_t pixelCount CGContextRef context CGColorSpaceRef colorSpace UInt8 pixelByteData A pointer to an array of RGBA bytes in memory RPVW_RGBAPixel pixelData.. size_t bytesPerRow size_t byteCount size_t pixelCount CGContextRef context CGColorSpaceRef colorSpace UInt8 pixelByteData A pointer to an array of RGBA bytes in memory RPVW_RGBAPixel pixelData The pixel struct with alpha in this version typedef struct RGBAPixel byte red byte green byte blue byte alpha RGBAPixel Bitmap..

AES interoperability between .Net and iPhone?

http://stackoverflow.com/questions/538435/aes-interoperability-between-net-and-iphone

At the very least you are using differing initialization vectors IV . The .Net code uses the key for IV. private static AesCryptoServiceProvider GetProvider byte key Set up the encryption objects AesCryptoServiceProvider result new AesCryptoServiceProvider byte RealKey Encryptor.GetKey key result result.Key RealKey result.IV.. IV. private static AesCryptoServiceProvider GetProvider byte key Set up the encryption objects AesCryptoServiceProvider result new AesCryptoServiceProvider byte RealKey Encryptor.GetKey key result result.Key RealKey result.IV RealKey return result and private static byte GetKey byte suggestedKey AesCryptoServiceProvider.. result new AesCryptoServiceProvider byte RealKey Encryptor.GetKey key result result.Key RealKey result.IV RealKey return result and private static byte GetKey byte suggestedKey AesCryptoServiceProvider p byte kRaw suggestedKey List kList new List for int i 0 i p.LegalKeySizes 0 .MinSize i 8 kList.Add kRaw i kRaw.Length..

How to convert NSData to byte array in iPhone?

http://stackoverflow.com/questions/724086/how-to-convert-nsdata-to-byte-array-in-iphone

to convert NSData to byte array in iPhone I want to convert NSData to a byte array so I write the following code NSData data NSData dataWithContentsOfFile filePath int len data length Byte.. to convert NSData to byte array in iPhone I want to convert NSData to a byte array so I write the following code NSData data NSData dataWithContentsOfFile filePath int len data length Byte byteData len byteData data bytes But the last line.. in iPhone I want to convert NSData to a byte array so I write the following code NSData data NSData dataWithContentsOfFile filePath int len data length Byte byteData len byteData data bytes But the last line of code pops up an error saying incompatible types in assignment . What is the correct way to convert the data to..

Retrieving a pixel alpha value for a UIImage

http://stackoverflow.com/questions/1042830/retrieving-a-pixel-alpha-value-for-a-uiimage

the alpha value of a pixel in a UIImageView. I have obtained the CGImage from UIImageView image and created a RGBA byte array from this. Alpha is premultiplied. CGImageRef image uiImage.CGImage NSUInteger width CGImageGetWidth image NSUInteger.. height CGImageGetHeight image CGColorSpaceRef colorSpace CGColorSpaceCreateDeviceRGB rawData malloc height width 4 bytesPerPixel 4 bytesPerRow bytesPerPixel width NSUInteger bitsPerComponent 8 CGContextRef context CGBitmapContextCreate rawData.. image CGColorSpaceRef colorSpace CGColorSpaceCreateDeviceRGB rawData malloc height width 4 bytesPerPixel 4 bytesPerRow bytesPerPixel width NSUInteger bitsPerComponent 8 CGContextRef context CGBitmapContextCreate rawData width height..

HTML character decoding in Objective-C / Cocoa Touch

http://stackoverflow.com/questions/1105169/html-character-decoding-in-objective-c-cocoa-touch

take the form of # number they are called numeric entity references . Basically it's a string representation of the byte that should be substituted. In the case of #038 it represents the character with the value of 38 in the ISO 8859 1 character.. in RSS is it's a reserved special character. What you need to do is parse the string and replace the entities with a byte matching the value between # and . I don't know of any great ways to do this in objective C but this stack overflow question..

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

I defined constants #define RGBA 4 #define RGBA_8_BIT 8 In my UIImage subclass I declared instance variables size_t bytesPerRow size_t byteCount size_t pixelCount CGContextRef context CGColorSpaceRef colorSpace UInt8 pixelByteData A pointer.. #define RGBA 4 #define RGBA_8_BIT 8 In my UIImage subclass I declared instance variables size_t bytesPerRow size_t byteCount size_t pixelCount CGContextRef context CGColorSpaceRef colorSpace UInt8 pixelByteData A pointer to an array of RGBA.. size_t pixelCount CGContextRef context CGColorSpaceRef colorSpace UInt8 pixelByteData A pointer to an array of RGBA bytes in memory RPVW_RGBAPixel pixelData The pixel struct with alpha in this version typedef struct RGBAPixel byte red byte green..

AES interoperability between .Net and iPhone?

http://stackoverflow.com/questions/538435/aes-interoperability-between-net-and-iphone

initialization vectors IV . The .Net code uses the key for IV. private static AesCryptoServiceProvider GetProvider byte key Set up the encryption objects AesCryptoServiceProvider result new AesCryptoServiceProvider byte RealKey Encryptor.GetKey.. GetProvider byte key Set up the encryption objects AesCryptoServiceProvider result new AesCryptoServiceProvider byte RealKey Encryptor.GetKey key result result.Key RealKey result.IV RealKey return result and private static byte GetKey byte.. byte RealKey Encryptor.GetKey key result result.Key RealKey result.IV RealKey return result and private static byte GetKey byte suggestedKey AesCryptoServiceProvider p byte kRaw suggestedKey List kList new List for int i 0 i p.LegalKeySizes..

How to convert NSData to byte array in iPhone?

http://stackoverflow.com/questions/724086/how-to-convert-nsdata-to-byte-array-in-iphone

to convert NSData to byte array in iPhone I want to convert NSData to a byte array so I write the following code NSData data NSData dataWithContentsOfFile.. to convert NSData to byte array in iPhone I want to convert NSData to a byte array so I write the following code NSData data NSData dataWithContentsOfFile filePath int len data length Byte byteData.. a byte array so I write the following code NSData data NSData dataWithContentsOfFile filePath int len data length Byte byteData len byteData data bytes But the last line of code pops up an error saying incompatible types in assignment . What is..

Byte Array to NSData

http://stackoverflow.com/questions/11860830/byte-array-to-nsdata

Array to NSData In a WebService JSON response is coming. In the response there is image is coming as a byte array. I have.. getting how to do that. Any help would be appreciated. I am confident that the byte array has image data in it. Sample Byte array for your reference 137 80 78 71 13 10 26 10 0 0 0 13 73 72 68 82 0 0 0 130 0 0 0 22 8 6 0 0 0 12 244 68 168 0 0 0..

Getting video from ALAsset

http://stackoverflow.com/questions/4545982/getting-video-from-alasset

to @ tmpfile FILE f fopen tmpfile cStringUsingEncoding 1 wb if f NULL NSLog @ Can not create tmp file. return Byte buffer Byte malloc bufferSize int read 0 offset 0 written 0 NSError err if size 0 do read rep getBytes buffer fromOffset.. FILE f fopen tmpfile cStringUsingEncoding 1 wb if f NULL NSLog @ Can not create tmp file. return Byte buffer Byte malloc bufferSize int read 0 offset 0 written 0 NSError err if size 0 do read rep getBytes buffer fromOffset offset .. file. return Byte buffer Byte malloc bufferSize int read 0 offset 0 written 0 NSError err if size 0 do read rep getBytes buffer fromOffset offset length bufferSize error err written fwrite buffer sizeof char read f offset read while..

How to convert NSData to byte array in iPhone?

http://stackoverflow.com/questions/724086/how-to-convert-nsdata-to-byte-array-in-iphone

to a byte array so I write the following code NSData data NSData dataWithContentsOfFile filePath int len data length Byte byteData len byteData data bytes But the last line of code pops up an error saying incompatible types in assignment . What.. objective c bytearray type conversion share improve this question You can't declare an array using a variable so Byte byteData len won't work. If you want to copy the data from a pointer you also need to memcpy which will go through the data.. each byte up to a specified length . Try NSData data NSData dataWithContentsOfFile filePath NSUInteger len data length Byte byteData Byte malloc len memcpy byteData data bytes len This code will dynamically allocate the array to the correct size..

Using ALAssetsLibrary and ALAsset take out Image as NSData

http://stackoverflow.com/questions/8473110/using-alassetslibrary-and-alasset-take-out-image-as-nsdata

UIImagePickerControllerReferenceURL resultBlock ^ ALAsset asset ALAssetRepresentation rep asset defaultRepresentation Byte buffer Byte malloc rep.size NSUInteger buffered rep getBytes buffer fromOffset 0.0 length rep.size error nil NSData data.. resultBlock ^ ALAsset asset ALAssetRepresentation rep asset defaultRepresentation Byte buffer Byte malloc rep.size NSUInteger buffered rep getBytes buffer fromOffset 0.0 length rep.size error nil NSData data NSData dataWithBytesNoCopy.. ALAssetRepresentation rep asset defaultRepresentation Byte buffer Byte malloc rep.size NSUInteger buffered rep getBytes buffer fromOffset 0.0 length rep.size error nil NSData data NSData dataWithBytesNoCopy buffer length buffered freeWhenDone..

Combine two .wav files in iPhone using Objective C

http://stackoverflow.com/questions/8504620/combine-two-wav-files-in-iphone-using-objective-c

1 d Wave1 length NSLog @ WAV 2 d Wave2 length totalAudioLen Wave1 length Wave2 length totalDataLen totalAudioLen 44 Byte header Byte malloc 44 header 0 'R' RIFF WAVE header header 1 'I' header 2 'F' header 3 'F' header 4 Byte totalDataLen 0xff.. length NSLog @ WAV 2 d Wave2 length totalAudioLen Wave1 length Wave2 length totalDataLen totalAudioLen 44 Byte header Byte malloc 44 header 0 'R' RIFF WAVE header header 1 'I' header 2 'F' header 3 'F' header 4 Byte totalDataLen 0xff header 5.. 44 Byte header Byte malloc 44 header 0 'R' RIFF WAVE header header 1 'I' header 2 'F' header 3 'F' header 4 Byte totalDataLen 0xff header 5 Byte totalDataLen 8 0xff header 6 Byte totalDataLen 16 0xff header 7 Byte totalDataLen 24 0xff..

Get video NSData from ALAsset url iOS

http://stackoverflow.com/questions/8791049/get-video-nsdata-from-alasset-url-ios

cocoa alasset share improve this question try this code ALAssetRepresentation rep asset defaultRepresentation Byte buffer Byte malloc rep.size NSUInteger buffered rep getBytes buffer fromOffset 0.0 length rep.size error nil NSData data.. share improve this question try this code ALAssetRepresentation rep asset defaultRepresentation Byte buffer Byte malloc rep.size NSUInteger buffered rep getBytes buffer fromOffset 0.0 length rep.size error nil NSData data NSData dataWithBytesNoCopy.. code ALAssetRepresentation rep asset defaultRepresentation Byte buffer Byte malloc rep.size NSUInteger buffered rep getBytes buffer fromOffset 0.0 length rep.size error nil NSData data NSData dataWithBytesNoCopy buffer length buffered freeWhenDone..

Get Exif data from UIImage - UIImagePickerController

http://stackoverflow.com/questions/9766394/get-exif-data-from-uiimage-uiimagepickercontroller

image_representation asset defaultRepresentation create a buffer to hold image data uint8_t buffer Byte malloc image_representation.size NSUInteger length image_representation getBytes buffer fromOffset 0.0 length image_representation.size.. to hold image data uint8_t buffer Byte malloc image_representation.size NSUInteger length image_representation getBytes buffer fromOffset 0.0 length image_representation.size error nil if length 0 buffer NSData object free buffer afterwards.. error nil if length 0 buffer NSData object free buffer afterwards NSData adata NSData alloc initWithBytesNoCopy buffer length image_representation.size freeWhenDone YES identify image type jpeg png RAW file ... using UTI hint..

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