Objective C - 与Android交互时高低位转换：
16lz
2021-01-23
在与Android交互过程中，因为Android是从低位往高位读，iOS是从高位往低位读，所以交互数据需要进行转换。
/* * convert big endian to little endian in C */uint16_t swap_uint16( uint16_t val );int16_t swap_int16( int16_t val );uint32_t swap_uint32( uint32_t val );int32_t swap_int32( int32_t val );int64_t swap_int64( int64_t val );uint64_t swap_uint64( uint64_t val );//////////////////////////////////////////////////////////////////////////////////////////////////////! Byte swap unsigned shortuint16_t swap_uint16( uint16_t val ){ return (val << 8) | (val >> 8 );}//! Byte swap shortint16_t swap_int16( int16_t val ){ return (val << 8) | ((val >> 8) & 0xFF);}//! Byte swap unsigned intuint32_t swap_uint32( uint32_t val ){ val = ((val << 8) & 0xFF00FF00 ) | ((val >> 8) & 0xFF00FF ); return (val << 16) | (val >> 16);}//! Byte swap intint32_t swap_int32( int32_t val ){ val = ((val << 8) & 0xFF00FF00) | ((val >> 8) & 0xFF00FF ); return (val << 16) | ((val >> 16) & 0xFFFF);}int64_t swap_int64( int64_t val ){ val = ((val << 8) & 0xFF00FF00FF00FF00ULL ) | ((val >> 8) & 0x00FF00FF00FF00FFULL ); val = ((val << 16) & 0xFFFF0000FFFF0000ULL ) | ((val >> 16) & 0x0000FFFF0000FFFFULL ); val = (val << 32) | ((val >> 32) & 0xFFFFFFFFULL); return val;}uint64_t swap_uint64( uint64_t val ){ val = ((val << 8) & 0xFF00FF00FF00FF00ULL ) | ((val >> 8) & 0x00FF00FF00FF00FFULL ); val = ((val << 16) & 0xFFFF0000FFFF0000ULL ) | ((val >> 16) & 0x0000FFFF0000FFFFULL ); val = (val << 32) | (val >> 32); return val;}
调用：
UInt64 recordTime = [[NSDate date] timeIntervalSince1970]*1000;UInt64 value = swap_uint64(recordTime);
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