VS2010下用C++编写图书管理小程序；（程序主要代码来自明日科技的书，但版本有差异，所以进行了部分调试和修改。）

各位朋友。

       这是我的第一个CSDN上的博客。我将自己按照明日科技的书“C++从入门到精通”这本书上的第18章的图书管理程序进行了敲写；由于我的版本和书中版本有差异。导致部分代码不太能够实现。同时自己也在网上搜索学习了一些东西。当然主要还是按照书上的代码。因为我还只是个初学者。写这个是希望能够送给像我一样的初学者。希望能够对大家有帮助。

下面分别将代码进行分享。

1 book.h程序

#define NUM1 128

#define NUM2 50

class CBook

{

public:

CBook(){}

CBook(char* cName,char* clsbn,char* cPrice,char* cAuthor);

~CBook(){}

public:

char* GetName();

void SetName(char* cName);

char* Getlsbn();

void Setlsbn(char* clsbn);

char* GetPrice();

void SetPrice(char* cPrice);

char* GetAuthor();

void SetAuthor(char* cAuthor);

void WriteData();

void DeleteData(int iCount);

void GetBookFromFile(int iCount);

protected:

char m_cName[NUM1];

char m_clsbn[NUM1];

char m_cPrice[NUM2];

char m_cAuthor[NUM2];

};

2. book.cpp代码

#include "StdAfx.h"

#include<string>

#include<fstream>

#include<iostream>

#include<iomanip>

#include<stdio.h>

#include<stdlib.h>

#include"Book.h"

using namespace std;

CBook::CBook(char* cName,char* clsbn,char* cPrice,char* cAuthor)

{

  strncpy_s(m_cName,cName,NUM1);

  strncpy_s(m_clsbn,clsbn,NUM1);

  strncpy_s(m_cPrice,cPrice,NUM2);

  strncpy_s(m_cAuthor,cAuthor,NUM2);

}

char* CBook::GetName()

{

    return m_cName;

}

void CBook::SetName(char* cName)

{  

   strncpy_s(m_cName,cName,NUM1);

}

char* CBook::Getlsbn()

{

   return m_clsbn;

}

void CBook::Setlsbn(char* clsbn)

{

   strncpy_s(m_clsbn,clsbn,NUM1);

}

char* CBook::GetPrice()

{

   return m_cPrice;

}

void CBook::SetPrice(char* cPrice)

{

   strncpy_s(m_cPrice,cPrice,NUM2);

}

char* CBook::GetAuthor()

{

   return m_cAuthor;

}

void CBook::SetAuthor(char* cAuthor)

{

   strncpy_s(m_cAuthor,cAuthor,NUM2);

}

void CBook::WriteData()

{

  ofstream ofile;

  ofile.open("book.dat",ios::binary|ios::app);

  try

     {

        ofile.write(m_cName,NUM1);

ofile.write(m_clsbn,NUM1);

ofile.write(m_cPrice,NUM2);

ofile.write(m_cAuthor,NUM2);

     }

  catch(...)

     {

throw"file error occured";

ofile.close();

     }

  ofile.close();

}

void CBook::DeleteData(int iCount)

{

   long respos;

   int iDataCount=0;

   fstream file;

   fstream tmpfile;

   ofstream ofile;

   char cTempBuf[NUM1+NUM1+NUM2+NUM2];

   file.open("book.dat",ios::binary|ios::in|ios::out|ios::trunc);

   file.seekg(0,ios::end);

   respos=file.tellg();

   iDataCount=respos/(NUM1+NUM1+NUM2+NUM2);

   if(iCount<0&&iCount>iDataCount)

        {

         throw "input number error";

         }

   else

        {

file.seekg((iCount)*(NUM1+NUM1+NUM2+NUM2),ios::beg);

for(int j=0;j<(iDataCount-iCount);j++)

{

memset(cTempBuf,0,NUM1+NUM1+NUM2+NUM2);

file.read(cTempBuf,NUM1+NUM1+NUM2+NUM2);

tmpfile.write(cTempBuf,NUM1+NUM1+NUM2+NUM2);

}

file.close();

tmpfile.seekg(0,ios::beg);

ofile.open("book.dat");

ofile.seekp((iCount-1)*(NUM1+NUM1+NUM2+NUM2),ios::beg);

for(int i=0;i<(iDataCount-iCount);i++)

{

   memset(cTempBuf,0,NUM1+NUM1+NUM2+NUM2);

tmpfile.read(cTempBuf,NUM1+NUM1+NUM2+NUM2);

ofile.write(cTempBuf,NUM1+NUM1+NUM2+NUM2);

}

        }

   tmpfile.close();

   ofile.close();

   remove("temp.data");

}

void CBook::GetBookFromFile(int iCount)

{

  char cName[NUM1];

  char clsbn[NUM1];

  char cPrice[NUM2];

  char cAuthor[NUM2];

  ifstream ifile;

  ifile.open("book.dat",ios::binary);

  try

     {

ifile.seekg(iCount*(NUM1+NUM1+NUM2+NUM2),ios::beg);

ifile.read(cName,NUM1);

if(ifile.tellg()>0)

strncpy(m_cName,cName,NUM1);

ifile.read(cPrice,NUM2);

if(ifile.tellg()>0)

strncpy(m_clsbn,clsbn,NUM1);

ifile.read(cAuthor,NUM2);

if(ifile.tellg()>0)

strncpy(m_cAuthor,cAuthor,NUM2);

      }

  catch(...)

     {

         throw"file error occured";

ifile.close();

     }

  ifile.close();

}

实现程序代码：

#include<iostream>

#include<iomanip>

#include<stdlib.h>

#include<conio.h>

#include<string>

#include<fstream>

#include"Book.h"

#include "StdAfx.h"

#include<stdio.h>

#define CMD_COLS 80

#define CMD_LINES 25

using namespace std;

void SetScreenGrid()    //窗口显示；

{

   char sysSetBuf[80];

   //HANDLE hOut=GetStdHandle(STD_OUTPUT_HANDLE);

   //sprintf_s(sysSetBuf,"mode con: cols=%d",CMD_COLS,CMD_LINES);

   //system("mode con cols=30 lines=6");//注释用代码无法在vc2010中完成目标。

   //SMALL_RECT rc={0,0,80,25};

   //SetConsoleWindowInfo(hOut,true,&rc);

   system("color 04");

   //system(sysSetBuf);

}

void SetsysCaption()

{

    system("title Sample");

}

void ClearScreen()

{

    system("cls");

}

void ShowWelcome()

{

     for (int i=0;i<7;i++)

   {

     cout<<endl;

   }

cout<<setw(40);

cout<<"************"<<endl;

cout<<setw(40);

cout<<"图书管理系统"<<endl;

cout<<setw(40);

cout<<"************"<<endl;

}

void ShowRootMenu()

{

cout<<setw(40);

cout<<"请选择功能"<<endl;

cout<<endl;

cout<<setw(38);

cout<<"1  添加新书"<<endl;

cout<<endl;

cout<<setw(38);

cout<<"2  浏览全部"<<endl;

cout<<endl;

cout<<setw(38);

cout<<"3  删除图书"<<endl;

}

void WaitUser()

{

    int iInputPage=0;

cout<<"enter 返回菜单  q 退出"<<endl;

char buf[256];

gets_s(buf);

if(buf[0]=='q')

system("exit");

}

int GetSelect()

{

   char buf[256];

   gets_s(buf);

   return atoi(buf);

}

void GuideInput()

{

    char inName[NUM1];

char inlsdn[NUM1];

char inPrice[NUM2];

char inAuthor[NUM2];

cout<<"输入书名"<<endl;

cin>>inName;

cout<<"输入ISBN"<<endl;

cin>>inlsdn;

cout<<"输入价格"<<endl;

cin>>inPrice;

cout<<"输入作者"<<endl;

cin>>inAuthor;

CBook book(inName,inlsdn,inPrice,inAuthor);

book.WriteData();

cout<<"Write Finish"<<endl;

WaitUser();

}

long GetFileLength(ifstream&ifs)

{

    long tmppos;

long respos;

tmppos=ifs.tellg();

ifs.seekg(0,ios::end);

respos=ifs.tellg();

ifs.seekg(tmppos,ios::beg);

return respos;

}

void ViewData(int iSelPage=1)

{

   int iPage=0;

   int iCurPage=0;

   int iDataCount=0;

   char inName[NUM1];

   char inLsbn[NUM1];

   char price[NUM2];

   char inAuthor[NUM2];

   bool bIndex=false;

   int iFileLength;

   iCurPage=iSelPage;

   ifstream ifile;

   ifile.open("book.dat",ios::binary);

   //iFileLength=400; //该行用于初期调试时，忽略掉GetFileLength(ifstream&ifs)函数时用；

   iFileLength=GetFileLength(ifile);

   iDataCount=iFileLength/(NUM1+NUM1+NUM2+NUM2);

   if(iDataCount>=1)

        bIndex=true;

   iPage=iDataCount/20+1;

   ClearScreen();

   cout<<"共有记录:"<<iDataCount<<"  ";

   cout<<"共有页数:"<<iPage<<"  ";

   cout<<"当前页数:"<<iCurPage<<"  ";

   cout<<"n 显示下一页  m  返回"<<endl;

   cout<<setw(5)<<"Index";

   cout<<setw(22)<<"Name"<<setw(22)<<"Lsbn";

   cout<<setw(15)<<"Price"<<setw(15)<<"Author";

   cout<<endl;

   try 

       {

  ifile.seekg((iCurPage-1)*20*(NUM1+NUM1+NUM2+NUM2),ios::beg);

  if(!ifile.fail())

      {

  for(int i=1;i<21;i++)

     {

 memset(inName,0,128);

 memset(inLsbn,0,128);

 memset(price,0,50);

 memset(inAuthor,0,50);

 if(bIndex)

     cout<<setw(3)<<((iCurPage-1)*20+i);

 ifile.read(inName,NUM1);

 cout<<setw(24)<<inName;

 ifile.read(inLsbn,NUM1);

 cout<<setw(24)<<inLsbn;

 ifile.read(price,NUM2);

 cout<<setw(10)<<price;

 ifile.read(inAuthor,NUM2);

 cout<<setw(16)<<inAuthor;

 cout<<endl;

 if(ifile.tellg()<0)

 bIndex=false;

 else

 bIndex=true;       

     }

      }

        }

    catch(...)

 {

 cout<<"throw file exception"<<endl;

 throw "file error occured";

 ifile.close();

  }

if(iCurPage<iPage)

  {

     iCurPage=iCurPage+1;

 WaitUser();//WaitView(iCurPage);

  }

  else

  {

     WaitUser();

  }

ifile.close(); 

} 

void DeleteBook()

{

 int iDelCount;

 cout<<"input delete index"<<endl;

 cin>>iDelCount;

 CBook tmpbook;

 tmpbook.DeleteData(iDelCount);

 cout<<"Delete Finish"<<endl;

 WaitUser();

}

   void main()

{

    ShowWelcome();

while(1)

  {

 ClearScreen();

 ShowWelcome();

 ShowRootMenu();

    switch(GetSelect())

   {

     case 1:

 ClearScreen();

 GuideInput();

 break;

 case 2:

                  ClearScreen();

 ViewData();

 break;

 case 3:

 ClearScreen();

 DeleteBook();

 break;

     }

   }

}

有关 这个显示窗口大小更改问题。可以在窗口生成后，鼠标右键点击标题栏，选择属性进行修改。不清楚的可以看下面的图。