大小端转换

关键字：大端  小端  主机字节序  网络字节序

 

/*** @file Code_Convert.h* @brief* @author Donhao* @date 2010-7-17 12:33:16* @version* <pre><b>copyright: </b></pre>* <pre><b>All rights reserved.</b></pre>* <pre><b>modification:</b></pre>* <pre>Write modifications here.</pre>*/#ifndef _CODE_CONVERT_H#define _CODE_CONVERT_H/*** @defgroup 主机字节序与网络字节序之间的转换* @brief** Detailed description.* @{*//*** @brief Code_Is_Net** 判断本机是主机字节序还是网络字节序.* @return BOOL*/BOOL Code_Is_Net(void);/*** @brief Code_H2N16** @param[in] x* @return unsigned short*/unsigned short Code_H2N16(unsigned short x);/*** @brief Code_H2N32** @param[in] x* @return unsigned long*/unsigned long Code_H2N32(unsigned long x);/** @} */#endif

 

/*** @file Code_Convert.c* @brief* @author Donhao* @date 2010-7-17 12:33:31* @version* <pre><b>All rights reserved.</b></pre>* <pre><b>modification:</b></pre>* <pre>Write modifications here.</pre>*/#include "Code_Convert.h"BOOL Code_Is_Net(void){ unsigned short value = 0x55AA; if (0x55 == *((unsigned char*)(&value))) { return TRUE; } else { return FALSE; }}unsigned short Code_H2N16(unsigned short x){ unsigned short y = 0; unsigned short z = 0; z = x & 0x00FF; y = z << 8; z = x & 0xFF00; y += (z >> 8); return y;}unsigned long Code_H2N32(unsigned long x){ unsigned long y = 0; unsigned long z = 0; z = x & 0x000000FF; y = z << 24; z = x & 0x0000FF00; y += (z << 8); z = x & 0x00FF0000; y += (z >> 8); z = x & 0xFF000000; y += (z >> 24); return y;}