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2014/10/15 ¤U¤È 10:04:59
iphone Programming Glossary: cfdatagetbyteptrGetting pixel data from UIImageView — works on simulator, not device http://stackoverflow.com/questions/1911360/getting-pixel-data-from-uiimageview-works-on-simulator-not-device provider CGImageGetDataProvider cgImage CFDataRef bitmapData CGDataProviderCopyData provider const UInt8 data CFDataGetBytePtr bitmapData size_t offset width y x 4 UInt8 red data offset UInt8 blue data offset 1 UInt8 green data offset 2 UInt8 alpha.. the device but not when on the simulator. I had a similar simulator device issue with a PNG's pixel buffer returned by CFDataGetBytePtr. This resolved the issue for me #if TARGET_IPHONE_SIMULATOR UInt8 red data offset UInt8 green data offset 1 UInt8 blue data..
http://stackoverflow.com/questions/2475450/extracting-images-from-a-pdf fmt CGPDFDataFormatRaw CFDataRef data CGPDFStreamCopyData strm fmt int32_t len CFDataGetLength data const void bytes CFDataGetBytePtr data now I have bytes for images in bytes pointer the problem is how to covert it into UIImage NSLog @ Image bytes length..
Encoding images to video with ffmpeg http://stackoverflow.com/questions/3334939/encoding-images-to-video-with-ffmpeg dataProvider CGImageGetDataProvider newCgImage CFDataRef bitmapData CGDataProviderCopyData dataProvider buffer uint8_t CFDataGetBytePtr bitmapData avpicture_fill AVPicture picture buffer PIX_FMT_RGB8 c width c height avpicture_fill AVPicture outpic outbuffer..
Image processing Glamour filter in iphone http://stackoverflow.com/questions/3549396/image-processing-glamour-filter-in-iphone provider CGImageGetDataProvider cgImage CFDataRef bitmapData CGDataProviderCopyData provider UInt8 data UInt8 CFDataGetBytePtr bitmapData int width image.size.width int height image.size.height NSInteger myDataLength width height 4 for int i 0 i myDataLength..
How to perform DNS query on iOS http://stackoverflow.com/questions/5000441/how-to-perform-dns-query-on-ios sockaddr_in remoteAddr CFDataRef saData CFDataRef CFArrayGetValueAtIndex addresses i remoteAddr struct sockaddr_in CFDataGetBytePtr saData if remoteAddr NULL Extract the ip address const char strIP41 inet_ntoa remoteAddr sin_addr NSString strDNS NSString..
image manipulation using slider in iphone http://stackoverflow.com/questions/8880109/image-manipulation-using-slider-in-iphone inImage currentImage.CGImage CFDataRef ref CGDataProviderCopyData CGImageGetDataProvider inImage UInt8 buf UInt8 CFDataGetBytePtr ref int length CFDataGetLength ref float value2 1 slider.value 0.5 NSLog @ i value for int i 0 i length i 4 int r i int..
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