2014/10/15 下午 10:04:44

iphone Programming Glossary: buffersize

Any idea why this image masking code does not work?

http://stackoverflow.com/questions/1133248/any-idea-why-this-image-masking-code-does-not-work

image round bytesPerRow to the nearest 16 bytes for performance's sake int bytesPerRow maskWidth 15 0xfffffff0 int bufferSize bytesPerRow maskHeight allocate memory for the bits CFMutableDataRef dataBuffer CFDataCreateMutable kCFAllocatorDefault.. memory for the bits CFMutableDataRef dataBuffer CFDataCreateMutable kCFAllocatorDefault 0 CFDataSetLength dataBuffer bufferSize the data will be 8 bits per pixel no alpha CGColorSpaceRef colourSpace CGColorSpaceCreateDeviceGray CGContextRef ctx CGBitmapContextCreate..

How can I make my AES encryption identical between Java and Objective-C (iPhone)?

http://stackoverflow.com/questions/2280375/how-can-i-make-my-aes-encryption-identical-between-java-and-objective-c-iphone

or equal to the input size plus the size of one block. That's why we need to add the size of one block here size_t bufferSize dataLength kCCBlockSizeAES128 void buffer malloc bufferSize size_t numBytesEncrypted 0 CCCryptorStatus cryptStatus CCCrypt.. why we need to add the size of one block here size_t bufferSize dataLength kCCBlockSizeAES128 void buffer malloc bufferSize size_t numBytesEncrypted 0 CCCryptorStatus cryptStatus CCCrypt kCCEncrypt kCCAlgorithmAES128 kCCOptionPKCS7Padding keyPtr.. kCCOptionPKCS7Padding keyPtr kCCKeySizeAES128 NULL initialization vector optional self bytes dataLength input buffer bufferSize output numBytesEncrypted if cryptStatus kCCSuccess the returned NSData takes ownership of the buffer and will free it on..

How to encrypt an NSString in Objective C with DES in ECB-Mode?

http://stackoverflow.com/questions/2512184/how-to-encrypt-an-nsstring-in-objective-c-with-des-in-ecb-mode

kCCOptionPKCS7Padding kCCOptionECBMode keyPtr kCCKeySizeDES NULL self bytes dataLength buffer bufferSize numBytesEncrypted Take a look at this post for more details regarding padding algorithms. Hope this helps. share improve..

Buffering NSOutputStream used as NSInputStream?

http://stackoverflow.com/questions/3221030/buffering-nsoutputstream-used-as-nsinputstream

void createBoundInputStream NSInputStream inputStreamPtr outputStream NSOutputStream outputStreamPtr bufferSize NSUInteger bufferSize @end @implementation NSStream BoundPairAdditions void createBoundInputStream NSInputStream inputStreamPtr.. createBoundInputStream NSInputStream inputStreamPtr outputStream NSOutputStream outputStreamPtr bufferSize NSUInteger bufferSize @end @implementation NSStream BoundPairAdditions void createBoundInputStream NSInputStream inputStreamPtr outputStream NSOutputStream.. void createBoundInputStream NSInputStream inputStreamPtr outputStream NSOutputStream outputStreamPtr bufferSize NSUInteger bufferSize CFReadStreamRef readStream CFWriteStreamRef writeStream assert inputStreamPtr NULL outputStreamPtr..

Getting video from ALAsset

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

^ ALAsset myasset ALAssetRepresentation rep myasset defaultRepresentation NSUInteger size rep size const int bufferSize 8192 NSLog @ Writing to @ tmpfile FILE f fopen tmpfile cStringUsingEncoding 1 wb if f NULL NSLog @ Can not create tmp 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 length 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 read 0 fclose f ALAssetsLibraryAccessFailureBlock..

How to programmatically get iOS's alphanumeric version string

http://stackoverflow.com/questions/4857195/how-to-programmatically-get-ioss-alphanumeric-version-string

function. NSString osVersionBuild int mib 2 CTL_KERN KERN_OSVERSION u_int namelen sizeof mib sizeof mib 0 size_t bufferSize 0 NSString osBuildVersion nil Get the size for the buffer sysctl mib namelen NULL bufferSize NULL 0 u_char buildBuffer bufferSize.. mib sizeof mib 0 size_t bufferSize 0 NSString osBuildVersion nil Get the size for the buffer sysctl mib namelen NULL bufferSize NULL 0 u_char buildBuffer bufferSize int result sysctl mib namelen buildBuffer bufferSize NULL 0 if result 0 osBuildVersion.. 0 NSString osBuildVersion nil Get the size for the buffer sysctl mib namelen NULL bufferSize NULL 0 u_char buildBuffer bufferSize int result sysctl mib namelen buildBuffer bufferSize NULL 0 if result 0 osBuildVersion NSString alloc initWithBytes buildBuffer..

How to use CCCrypt() to encrypt a file?

http://stackoverflow.com/questions/5564641/how-to-use-cccrypt-to-encrypt-a-file

to use CCCrypt to encrypt a file when I encrypt a file doc pdf etc. I use size_t bufferSize dataLength kCCBlockSizeAES128 CCCrypt kCCEncrypt kCCAlgorithmAES128 kCCOptionPKCS7Padding keyPtr kCCKeySizeAES256 NULL.. keyPtr kCCKeySizeAES256 NULL initialization vector optional dataBytes dataLength input buffer bufferSize output numBytesEncrypted when decrypt I use size_t bufferSize dataLength kCCBlockSizeAES128 CCCryptorStatus result CCCrypt.. vector optional dataBytes dataLength input buffer bufferSize output numBytesEncrypted when decrypt I use size_t bufferSize dataLength kCCBlockSizeAES128 CCCryptorStatus result CCCrypt kCCDecrypt kCCAlgorithmAES128 kCCOptionPKCS7Padding keyPtr..