C++实现的CMemoryStream类

最新推荐文章于 2023-09-24 12:37:36 发布

athlong0564

最新推荐文章于 2023-09-24 12:37:36 发布

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本文介绍了一个 C++ 版本的 MemoryStream 类实现，该类提供了读写内存缓冲区的功能，支持多种基本数据类型和字符串的操作，并展示了如何使用这个类。

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C#的MemoryStream用起来感觉不错,所以考虑C++实现一把.另外可以使用我上次写的一个类:CMemoryBuffer.先贴代码再解释吧.

头文件:

#pragma once #include "MemoryBuffer.h" #include <string> #include <vector> using namespace std; #define _Base_Struct_Write_Func(_Struct_Type) void Write(const _Struct_Type &field)/ {/ Write((const BYTE*)&field,sizeof(_Struct_Type));/ }/ #define _Base_Struct_Read_Func(_Struct_Type) void Read( _Struct_Type &field)/ {/ Read(((BYTE*)&field),sizeof(_Struct_Type));/ }/ #define _Struct_Vector_Write_Func(_Struct_Type) void Write(vector<_Struct_Type> &vcts)/ {/ Write((int)vcts.size());/ for (std::vector<_Struct_Type>::iterator iter = vcts.begin(); iter != vcts.end(); ++iter)/ {/ Write(*iter);/ }/ }/ #define _Struct_Vector_Read_Func(_Struct_Type) void Read(vector<_Struct_Type> &vcts)/ {/ int iCnt = 0;/ Read(iCnt);/ if(iCnt <= 0) return;/ _Struct_Type _Item;/ for (int i = 0;i < iCnt; i ++)/ {/ Read(_Item);/ vcts.push_back(_Item);/ }/ }/ #define _Base_Struct_Read_Write_Func(_Struct_Type) _Base_Struct_Write_Func(_Struct_Type)/ _Base_Struct_Read_Func(_Struct_Type)/ _Struct_Vector_Write_Func(_Struct_Type)/ _Struct_Vector_Read_Func(_Struct_Type)/ class BaseClassDll_API CMemoryStream { //private: // CMemoryStream(void); public: // Summary: // Provides the fields that represent reference points in streams for seeking. enum SeekOrigin { // Summary: // Specifies the beginning of a stream. soBegin = 0, // // Summary: // Specifies the current position within a stream. soCurrent = 1, // // Summary: // Specifies the end of a stream. soEnd = 2, }; public: CMemoryStream(CMemoryBuffer *tpbuffer); CMemoryStream(); virtual ~CMemoryStream(void); static CMemoryStream * GetInstance(void); public: //基本结构 _Base_Struct_Read_Write_Func(int) _Base_Struct_Read_Write_Func(unsigned int) _Base_Struct_Read_Write_Func(short) _Base_Struct_Read_Write_Func(unsigned short) _Base_Struct_Read_Write_Func(__int64) _Base_Struct_Read_Write_Func(unsigned __int64) _Base_Struct_Read_Write_Func(char) _Base_Struct_Read_Write_Func(unsigned char) _Base_Struct_Read_Write_Func(float) _Base_Struct_Read_Write_Func(double) _Base_Struct_Read_Write_Func(SYSTEMTIME) //字符串 void Write(LPCWSTR szStr); void Write(LPCSTR szStr); void Write(const string &szStr); void Write(const wstring &szStr); void Write(const vector<string> &szStrVct); void Write(const vector<wstring> &szStrVct); void Read(string &tszStr); void Read(wstring &tszStr); void Read(string &tszStr,const int tiNumberofcharacter); void Read(wstring &tszStr,const int tiNumberofcharacter); void Read(vector<string> &szStrVct); void Read(vector<wstring> &szStrVct); //扩展类型 void Write(const CMemoryBuffer &tbuffer); void Read(CMemoryBuffer &tbuffer); //字节流 void Write(const BYTE * tpBytes , const int &tiLength); void Read(BYTE * tpBytes , const int tiLength); public: //Stream操作 void Seek(int tioffset, SeekOrigin loc); int GetOffset()const{return this->m_iOffset;}; int GetLength()const{return this->m_pBuffer->GetLength();}; protected: CMemoryBuffer *m_pBuffer; int m_iOffset; };

CPP文件

#include "StdAfx.h" #include "MemoryStream.h" CMemoryStream::CMemoryStream(void) { m_pBuffer = new CMemoryBuffer(); m_iOffset = 0; } CMemoryStream::CMemoryStream(CMemoryBuffer *tpbuffer) { m_pBuffer = tpbuffer; m_iOffset = 0; } CMemoryStream * CMemoryStream::GetInstance() { CMemoryStream *pStream = new CMemoryStream(new CMemoryBuffer); return pStream; } CMemoryStream::~CMemoryStream(void) { if(m_pBuffer != NULL) delete m_pBuffer; m_pBuffer = NULL; } void CMemoryStream::Write(LPCWSTR szStr) { if (szStr == NULL ) { return; } int iLength = (int)wcslen(szStr) * sizeof(wchar_t); Write(iLength); if (iLength != 0) { Write((const BYTE*)szStr,iLength); } } void CMemoryStream::Write(LPCSTR szStr) { if (szStr == NULL ) { return; } int iLength = (int)strlen(szStr) * sizeof(char); Write(iLength); if (iLength != 0) { Write((const BYTE*)szStr,iLength); } } void CMemoryStream::Write(const string &szStr) { Write(szStr.c_str()); } void CMemoryStream::Write(const vector<string> &szStrVct) { int iCnt = (int)szStrVct.size(); Write(iCnt); for (int i = 0; i < (int)szStrVct.size(); i ++) { Write(szStrVct.at(i)); } } void CMemoryStream::Write(const wstring &szStr) { Write(szStr.c_str()); } void CMemoryStream::Write(const vector<wstring> &szStrVct) { int iCnt = (int)szStrVct.size(); Write(iCnt); for (int i = 0; i < (int)szStrVct.size(); i ++) { Write(szStrVct.at(i)); } } void CMemoryStream::Write(const CMemoryBuffer &field) { Write(field.GetLength()); Write(field.c_Bytes(),field.GetLength()); } void CMemoryStream::Write(const BYTE * tpBytes , const int &tiLength) { m_pBuffer->Insert(m_iOffset,tpBytes,tiLength); m_iOffset +=tiLength; } void CMemoryStream::Read( BYTE * tpBytes , const int tiLength) { if(tpBytes == NULL) return; if(m_iOffset + tiLength > m_pBuffer->GetLength()) return; memcpy((tpBytes),m_pBuffer->c_Bytes() + m_iOffset,tiLength); m_iOffset +=tiLength; } void CMemoryStream::Read(string &tszStr) { int iBytesCnt = 0; Read(iBytesCnt); if (iBytesCnt >= 0) { Read(tszStr,iBytesCnt); } } void CMemoryStream::Read(vector<string> &szStrVct) { int iCnt = 0; Read(iCnt); if (iCnt >= 0) { for (int i = 0; i < iCnt; i ++) { string temp; Read(temp); szStrVct.push_back(temp); } } } void CMemoryStream::Read(string &tszStr,const int tiNumberofcharacter) { char *pszTemp = new char[tiNumberofcharacter + 1]; memset(pszTemp,0,(tiNumberofcharacter + 1) * sizeof(char)); Read((BYTE*)pszTemp,(sizeof(char))*tiNumberofcharacter); tszStr = pszTemp; delete []pszTemp; } void CMemoryStream::Read(wstring &tszStr) { int iBytesCnt = 0; Read(iBytesCnt); if (iBytesCnt >= 0) { Read(tszStr,iBytesCnt / sizeof(wchar_t) ); } } void CMemoryStream::Read(vector<wstring> &szStrVct) { int iCnt = 0; Read(iCnt); if (iCnt >= 0) { for (int i = 0; i < iCnt; i ++) { wstring temp; Read(temp); szStrVct.push_back(temp); } } } void CMemoryStream::Read(wstring &tszStr,const int tiNumberofcharacter) { wchar_t *pszTemp = new wchar_t[tiNumberofcharacter + 1]; memset(pszTemp,0,(tiNumberofcharacter + 1) * sizeof(wchar_t)); Read((BYTE*)pszTemp,(sizeof(wchar_t))*tiNumberofcharacter); tszStr = pszTemp; delete []pszTemp; } void CMemoryStream::Read( CMemoryBuffer &field) { int iBytesCnt = 0; Read(iBytesCnt); BYTE *pBytes = new BYTE[iBytesCnt]; memset(pBytes,0,iBytesCnt); Read(pBytes,iBytesCnt); field.Append(pBytes,iBytesCnt); } void CMemoryStream::Seek(int tioffset, SeekOrigin loc) { switch(loc) { case soBegin: m_iOffset = tioffset; break; case soCurrent: m_iOffset += tioffset; break; case soEnd: m_iOffset = m_pBuffer->GetLength(); break; } }

用法举例

string s1("1111"); CMemoryStream temp_ms; temp_ms.Write(s1); temp_ms.Seek(0,CMemoryStream::soBegin); string s2; temp_ms.Read(s2); ASSERT(s1 == s2);

支持大部分类型,如果你有自定义类型,可以在以上基础扩充.