内存读取以及内存对齐

 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(測定情報数) : "<<( 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(时): "<<( 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(座標件数): "<<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(測定情報数) : "<<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(时): "<<(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(座標件数): "<<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; }