关于#if _MSC_VER > 1000 #pragma once #endif

帮我分析以下整改头文件中的每一个函数和使用方法以及注释说明，再试着举例使用#ifndef NXOpen_SPEECHRECOGNITIONMOCK_HXX_INCLUDED #define NXOpen_SPEECHRECOGNITIONMOCK_HXX_INCLUDED //-------------------------------------------------------------------------- // Copyright 2022 Siemens //-------------------------------------------------------------------------- // Header for C++ interface to JA API //-------------------------------------------------------------------------- // // Source File: // SpeechRecognitionMock.ja // // Generated by: // apiwrap // // WARNING: // This file is automatically generated - do not edit by hand // #ifdef _MSC_VER #pragma once #endif #include <NXOpen/NXDeprecation.hxx> #include <vector> #include <NXOpen/NXString.hxx> #include <NXOpen/Callback.hxx> #include <NXOpen/TaggedObject.hxx> #include <NXOpen/libnxopencpp_exports.hxx> #ifdef _MSC_VER #pragma warning(push) #pragma warning(disable:4996) #endif #ifdef __GNUC__ #pragma GCC diagnostic ignored "-Wdeprecated-declarations" #endif names

解释以下CANOE的DLL扩展函数的C++头文件KeyGenAlgoExOpt.h。 //**************************************************************************************** // File name: KeyGenAlgoExOpt.h // Description: Abstract base class defines the interface for the key generation algorithm // Date: 2009-05-29 // Copyright: Vector Informatik GmbH - 2003 //**************************************************************************************** #ifndef KEY_GEN_ALGO_INTERFACE_H #define KEY_GEN_ALGO_INTERFACE_H #if _MSC_VER > 1000 #pragma once #endif #ifdef GENERATEKEYEXOPTIMPL_EXPORTS #define KEYGENALGO_API extern "C" __declspec(dllexport) #else #define KEYGENALGO_API __declspec(dllimport) #endif enum VKeyGenResultExOpt { KGREO_Ok = 0, KGREO_BufferToSmall = 1, KGREO_SecurityLevelInvalid = 2, KGREO_VariantInvalid = 3, KGREO_UnspecifiedError = 4 }; // The client has to provide a keyArray buffer and has to transfer this buffer - // including its size - to the GenerateKey method. The method checks, if the size is // sufficient. The client can discover the required size by examining the service used // transfer the key to the ECU. // Returns false if the key could not be generated: // -> keyArraySize to small // -> generation for specified security level not possible // -> variant unknown KEYGENALGO_API VKeyGenResultExOpt GenerateKeyExOpt( const unsigned char* ipSeedArray, unsigned int iSeedArraySize, const unsigned int iSecurityLevel, const char* ipVariant, const char* ipOptions, unsigned char* iopKeyArray, unsigned int iMaxKeyArraySize, unsigned int& oActualKeyArraySize); #endif // KEY_GEN_ALGO_INTERFACE_H

根据代码完成任务： 为类Complex添加一个普通成员函数，实现两个复数的乘法运算。 为类Complex添加一个友元函数，重载乘法运算符，实现两个复数的乘法运算。 为类Complex添加一个成员函数，重载赋值运算符，实现复数的赋值运算。 测试以上函数。 代码如下： #if !defined(AFX_COMPLEX_H__B806A409_5547_4464_987B_99238E6DA4DC__INCLUDED_) #define AFX_COMPLEX_H__B806A409_5547_4464_987B_99238E6DA4DC__INCLUDED_ #if _MSC_VER > 1000 #pragma once #endif // _MSC_VER > 1000 class Complex { public: Complex operator + (Complex c); friend Complex operator - (Complex c1, Complex c2); Complex operator - (); Complex operator ++ (); Complex operator ++ (int); friend Complex operator -- (Complex& c); friend Complex operator -- (Complex& c, int); void show(); Complex(double r = 0, double i = 0); virtual ~Complex(); private: double image; double real; }; #endif // !defined(AFX_COMPLEX_H__B806A409_5547_4464_987B_99238E6DA4DC__INCLUDED_) #include "Complex.h" #include<iostream> using namespace std; ////////////////////////////////////////////////////////////////////// // Construction/Destruction ////////////////////////////////////////////////////////////////////// Complex::Complex(double r, double i) { real = r; image = i; } Complex::~Complex() { } void Complex::show() { cout << "(" << real << ", " << image << ")" << endl; }