內存讀取以及內存對齊

 C++ Code 

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TravelInfo.h文件  /*  * TravelInfo.h  *  *  Created on: 2011-11-30  */ #ifndef TRAVELINFO_H_ #define TRAVELINFO_H_ typedef unsigned char u_char; typedef unsigned short u_short; struct CoordinateInfo {  char latChange;  short latitude;  char lonChange;  short longitude;  short direction;  u_short speed;  char additionalInfo;  u_char counter;  u_char routeType;  u_char matchingLevel; }; struct Head {  u_char year;  u_char month;  u_char day;  u_char hour;  u_char minute;  u_char second;  u_char latDegree;  u_char latPoint;  u_char lonDegree;  u_char lonPoint;  u_short coordinateNum;  CoordinateInfo *coordinateInfoList; }; struct Management {  u_short measureinfoNum;  u_char interval;  u_char mapVersion;  u_char additionalInfoFlag;  u_char vehicleType;  short nothing1;  short nothing2;  short nothing3;  Head *headList; }; class TravelInfo { private:  static char *buffer; public:  TravelInfo();  ~TravelInfo();  char * buildData();  void parserData();  void print(); }; #endif /* TRAVELINFO_H_ */ TravelInfo.cpp文件 //============================================================================ // Name        : TravelInfo.cpp // Version     : // Copyright   : Your copyright notice // Description : Hello World in C++, Ansi-style //============================================================================ #ifndef TRAVELINFO_H_ #include "TravelInfo.h" #endif #include <iostream> using namespace std; char *TravelInfo::buffer = NULL; TravelInfo::TravelInfo(void) {  buffer = new char[10*1024]; } TravelInfo::~TravelInfo(void) { } char* TravelInfo::buildData(void) {  int offset = 0;  Management m;  m.measureinfoNum = 2;  m.interval = 60;  m.mapVersion = 1;  m.additionalInfoFlag = 1;  m.vehicleType = 1;  m.nothing1 = 0;  m.nothing2 = 0;  m.nothing3 = 0;  m.headList = new Head[2];  memcpy(buffer, &m, sizeof(Management) - sizeof(m.headList));  // headerList is a point  offset = sizeof(Management) - sizeof(m.headList);  for(int i = 0; i < 2; i++)  {   Head head;   head.year = 2;   head.month = 7;   head.day = 19;   head.hour = 14;   head.minute = 25 + i;   head.second = 30;   head.latDegree = 35+i;   head.latPoint = 13+i;   head.lonDegree = 65+i;   head.lonPoint = 24+i;   head.coordinateNum = 2;   head.coordinateInfoList = new CoordinateInfo[2];   memcpy(buffer+offset, &head, sizeof(Head) - sizeof(head.coordinateInfoList));   offset = offset + sizeof(Head) - sizeof(head.coordinateInfoList);   for(int j = 0; j<2; j++)   {    CoordinateInfo c;    memset(&c, 0, sizeof(CoordinateInfo));    c.latChange = -1;    c.latitude = 3456+j;    c.lonChange = -1;    c.longitude = 4567+j;    c.direction = 0+j;    c.speed = 60+j;    c.additionalInfo = 'P';    c.counter = 10+j;    c.routeType = 1+j;    c.matchingLevel = 1+j;    memcpy(buffer+offset, &c, sizeof(CoordinateInfo));    offset = offset + sizeof(CoordinateInfo);    head.coordinateInfoList[j] = c;   }   m.headList[i] = head;  }  return buffer; } void TravelInfo::parserData(void) {  char * dataBuffer = buildData();  int offset = 0;  Management m;  // Copy ManagePart from dataBuffer  memcpy(&m, dataBuffer, sizeof(Management)-sizeof(m.headList));  offset = offset + sizeof(Management)-sizeof(m.headList);  // Build the list of HeaderPart  m.headList = new Head[m.measureinfoNum];  for(int i = 0;i < m.measureinfoNum;i++)  {   // Copy HeaderParts from dataBuffer   memcpy(m.headList+i, dataBuffer+offset, sizeof(Head)-sizeof(m.headList[i].coordinateInfoList));   offset = offset + sizeof(Head)-sizeof(m.headList[i].coordinateInfoList);   // Build the coordinateInfoList of every HeaderPart   m.headList[i].coordinateInfoList = new CoordinateInfo[m.headList[i].coordinateNum];   for(int j=0; j < m.headList[i].coordinateNum; j++)   {    // Copy CoordinateInfos from dataBuffer    memcpy(m.headList[i].coordinateInfoList+j, dataBuffer+offset, sizeof(CoordinateInfo));    offset = offset + sizeof(CoordinateInfo);   }  }  cout<<"-----------------------管理部(Start)------------------------"<<endl;  int measureinfoNum = m.measureinfoNum;  cout<<"measureinfoNum(測定情報數) : "<<(int)measureinfoNum<<endl;  cout<<"interval(座標間隔): "<<(int)m.interval<<endl;  cout<<"mapVersion(地図Ver): "<<(int)m.mapVersion<<endl;  cout<<"additionalInfoFlag(付加情報flag): "<<(int)m.additionalInfoFlag<<endl;  cout<<"vehicleType(車載機種別): "<<(int)m.vehicleType<<endl;  cout<<"nothing1(空領域): "<<(int)m.nothing1<<endl;  cout<<"nothing2(空領域): "<<(int)m.nothing2<<endl;  cout<<"nothing3(空領域): "<<(int)m.nothing3<<endl;  cout<<"-----------------------管理部(End)------------------------"<<endl;  for(int i = 0; i <measureinfoNum; i++)  {   cout<<"--------------------------Header部"<<i+1<<"(Start)---------------------------"<<endl;   cout<<"year(年): "<<(int)m.headList[i].year<<endl;   cout<<"month(月): "<<(int)m.headList[i].month<<endl;   cout<<"day(日): "<<(int)m.headList[i].day<<endl;   cout<<"hour(時): "<<(int)m.headList[i].hour<<endl;   cout<<"minute(分): "<<(int)m.headList[i].minute<<endl;   cout<<"second(秒): "<<(int)m.headList[i].second<<endl;   cout<<"latDegree(緯度(度)): "<<(int)m.headList[i].latDegree<<endl;   cout<<"latPoint(緯度(分)): "<<(int)m.headList[i].latPoint<<endl;   cout<<"lonPoint(経度(度)): "<<(int)m.headList[i].lonDegree<<endl;   cout<<"lonPoint(経度(分)): "<<(int)m.headList[i].lonPoint<<endl;   int coordinateNum = m.headList[i].coordinateNum;   cout<<"coordinateNum(座標件數): "<<coordinateNum<<endl;   for(int j = 0; j < coordinateNum; j++)   {    cout<<"----------------座標情報"<<j+1<<"(Start)----------------"<<endl;    cout<<"latChange(経変): "<<(int)m.headList[i].coordinateInfoList[j].latChange<<endl;    cout<<"latitude(経度): "<<(int)m.headList[i].coordinateInfoList[j].latitude<<endl;    cout<<"lonChange(緯変): "<<(int)m.headList[i].coordinateInfoList[j].lonChange<<endl;    cout<<"longitude(緯度): "<<(int)m.headList[i].coordinateInfoList[j].longitude<<endl;    cout<<"direction(方位): "<<(int)m.headList[i].coordinateInfoList[j].direction<<endl;    cout<<"speed(速度): "<<(int)m.headList[i].coordinateInfoList[j].speed<<endl;    cout<<"additionalInfo(付加情報): "<<(char)m.headList[i].coordinateInfoList[j].additionalInfo<<endl;    cout<<"counter: "<<(int)m.headList[i].coordinateInfoList[j].counter<<endl;    cout<<"routeType(道路種別): "<<(int)m.headList[i].coordinateInfoList[j].routeType<<endl;    cout<<"matchingLevel(Matching): "<<(int)m.headList[i].coordinateInfoList[j].matchingLevel<<endl;    cout<<"----------------座標情報"<<j+1<<"(End)----------------"<<endl;   }   cout<<"--------------------------Header部"<<i+1<<"(End)---------------------------"<<endl;  } } int main() {  TravelInfo travelInfo;  travelInfo.parserData();  unsigned int a=1;  int b=-2;  int c=-2;  cout<<b<<endl;  if(a+c>0)   cout<<a+b<<endl; /* cout<<"-----------------------管理部(Start)------------------------"<<endl;  int measureinfoNum = *(u_short*)dataBuffer;  cout<<"measureinfoNum(測定情報數) : "<<measureinfoNum<<endl;  dataBuffer =dataBuffer+sizeof(u_short);  cout<<"interval(座標間隔): "<<(int)(*(u_char*)(dataBuffer))<<endl;  dataBuffer =dataBuffer+sizeof(u_char);  cout<<"mapVersion(地図Ver): "<<(int)(*(u_char*)(dataBuffer))<<endl;  dataBuffer =dataBuffer+sizeof(u_char);  cout<<"additionalInfoFlag(付加情報flag): "<<(int)(*(u_char*)(dataBuffer))<<endl;  dataBuffer =dataBuffer+sizeof(u_char);  cout<<"vehicleType(車載機種別): "<<(int)(*(u_char*)(dataBuffer))<<endl;  dataBuffer = dataBuffer+sizeof(u_char);  cout<<"nothing1(空領域): "<<*(u_short*)(dataBuffer)<<endl;  dataBuffer = dataBuffer+sizeof(u_short);  cout<<"nothing2(空領域): "<<*(u_short*)(dataBuffer)<<endl;  dataBuffer = dataBuffer+sizeof(u_short);  cout<<"nothing3(空領域): "<<*(u_short*)(dataBuffer)<<endl;  dataBuffer = dataBuffer+sizeof(u_short);  cout<<"-----------------------管理部(End)------------------------"<<endl;  for(int i = 0; i <measureinfoNum; i++)  {   cout<<"--------------------------Header部"<<i+1<<"(Start)---------------------------"<<endl;   cout<<"year(年): "<<(int)(*(u_char*)(dataBuffer))<<endl;   dataBuffer = dataBuffer+sizeof(u_char);   cout<<"month(月): "<<(int)(*(u_char*)(dataBuffer))<<endl;   dataBuffer = dataBuffer+sizeof(u_char);   cout<<"day(日): "<<(int)(*(u_char*)(dataBuffer))<<endl;   dataBuffer = dataBuffer+sizeof(u_char);   cout<<"hour(時): "<<(int)(*(u_char*)(dataBuffer))<<endl;   dataBuffer = dataBuffer+sizeof(u_char);   cout<<"minute(分): "<<(int)(*(u_char*)(dataBuffer))<<endl;   dataBuffer = dataBuffer+sizeof(u_char);   cout<<"second(秒): "<<(int)(*(u_char*)(dataBuffer))<<endl;   dataBuffer = dataBuffer+sizeof(u_char);   cout<<"latDegree(緯度(度)): "<<(int)(*(u_char*)(dataBuffer))<<endl;   dataBuffer = dataBuffer+sizeof(u_char);   cout<<"latPoint(緯度(分)): "<<(int)(*(u_char*)(dataBuffer))<<endl;   dataBuffer = dataBuffer+sizeof(u_char);   cout<<"lonPoint(経度(度)): "<<(int)(*(u_char*)(dataBuffer))<<endl;   dataBuffer = dataBuffer+sizeof(u_char);   cout<<"lonPoint(経度(分)): "<<(int)(*(u_char*)(dataBuffer))<<endl;   dataBuffer = dataBuffer+sizeof(u_char);   int coordinateNum = *(u_short*)(dataBuffer);   cout<<"coordinateNum(座標件數): "<<coordinateNum<<endl;   dataBuffer = dataBuffer+sizeof(u_short);   for(int j = 0; j < 2; j++)   {    cout<<"----------------座標情報"<<j+1<<"(Start)----------------"<<endl;    cout<<"latChange(経変): "<<(int)(*(char*)(dataBuffer))<<endl;    dataBuffer = dataBuffer+sizeof(char);    cout<<"latitude(経度): "<<*(short*)(dataBuffer)<<endl;    dataBuffer = dataBuffer+sizeof(short);    cout<<"lonChange(緯変): "<<(int)(*(char*)(dataBuffer))<<endl;    dataBuffer = dataBuffer+sizeof(char);    cout<<"longitude(緯度): "<<*(short*)(dataBuffer)<<endl;    dataBuffer = dataBuffer+sizeof(short);    cout<<"direction(方位): "<<*(short*)(dataBuffer)<<endl;    dataBuffer = dataBuffer+sizeof(short);    cout<<"speed(速度): "<<*(u_short*)(dataBuffer)<<endl;    dataBuffer = dataBuffer+sizeof(u_short);    cout<<"additionalInfo(付加情報): "<<*(char*)(dataBuffer)<<endl;    dataBuffer = dataBuffer+sizeof(char);    cout<<"counter: "<<(int)(*(u_char*)(dataBuffer))<<endl;    dataBuffer = dataBuffer+sizeof(u_char);    cout<<"routeType(道路種別): "<<(int)(*(u_char*)(dataBuffer))<<endl;    dataBuffer = dataBuffer+sizeof(u_char);    cout<<"matchingLevel(Matching): "<<(int)(*(u_char*)(dataBuffer))<<endl;    dataBuffer = dataBuffer+sizeof(u_char);    cout<<"----------------座標情報"<<j+1<<"(End)----------------"<<endl;   }   cout<<"--------------------------Header部"<<i+1<<"(End)---------------------------"<<endl;  }*/  return 0; }