大小端转换（C++）

// ChangeBS.cpp: implementation of the CChangeBS class. // ////////////////////////////////////////////////////////////////////// #include "stdafx.h" #include "Change.h" #include "ChangeBS.h" #ifdef _DEBUG #undef THIS_FILE static char THIS_FILE[]=__FILE__; #define new DEBUG_NEW #endif ////////////////////////////////////////////////////////////////////// // Construction/Destruction ////////////////////////////////////////////////////////////////////// CChangeBS::CChangeBS() { } CChangeBS::~CChangeBS() { } void CChangeBS::OnChange(short InParam, short &OutParam) { union { char ch[2]; unsigned short iTemp; }u,r; u.iTemp = InParam; r.ch[0] = u.ch[1]; r.ch[1] = u.ch[0]; OutParam = r.iTemp; } void CChangeBS::OnChange(int InParam, int &OutParam) { union { char ch[4]; int iTemp; }u,r; u.iTemp = InParam; r.ch[0] = u.ch[3]; r.ch[1] = u.ch[2]; r.ch[2] = u.ch[1]; r.ch[3] = u.ch[0]; OutParam = r.iTemp; } void CChangeBS::OnChange(float InParam, float &OutParam) { union { char ch[4]; float iTemp; }u,r; u.iTemp = InParam; r.ch[0] = u.ch[3]; r.ch[1] = u.ch[2]; r.ch[2] = u.ch[1]; r.ch[3] = u.ch[0]; OutParam = r.iTemp; } void CChangeBS::OnChange(double InParam, double &OutParam) { union { char ch[8]; double iTemp; }u,r; u.iTemp = InParam; r.ch[0] = u.ch[7]; r.ch[1] = u.ch[6]; r.ch[2] = u.ch[5]; r.ch[3] = u.ch[4]; r.ch[4] = u.ch[3]; r.ch[5] = u.ch[2]; r.ch[6] = u.ch[1]; r.ch[7] = u.ch[0]; OutParam = r.iTemp; }