图书管理系统，实现图书信息的增加、删除、查看.zip

#include<iostream> #include<stdlib.h> #include<iomanip> #include<string> #include<fstream> #include"Book.h" using namespace std; #define CMD_COLS 80 #define CMD_LINES 80 void SetScreenGrid(); void ClearScreen(); void SetSysCaption(const char *pText); void ShowWelcome(); void ShowRootMenu(); void WaitView(int iCurPage); void WaitUser(); void GuideInput(); int GetSelect(); long GetFileLength(ifstream &ifs); void ViewData(int iSelPage); void DeleteBookFromFile(); //设置屏幕显示的行数和列数 void SetScreenGrid() { char sysSetBuf[80]; sprintf_s(sysSetBuf, "mode con cols=%d lines=%d", CMD_COLS, CMD_LINES); system(sysSetBuf); } //设置控制台标题栏信息 void SetSysCaption(const char* pText) { char sysSetBuf[80]; sprintf_s(sysSetBuf, "title %s", pText); system(sysSetBuf); } //清屏 void ClearScreen() { system("cls"); } //显示欢迎信息 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; } //显示系统主菜单 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; } //等待用户输入 void WaitUser() { int iInputPage = 0; cout << "enter 返回主菜单 q 退出" << endl; char buf[256]; gets_s(buf); if (buf[0] = 'q') system("exit"); } //获取用户选择 int GetSelect() { char buf[256]; gets_s(buf); return atoi(buf); } //添加新书 void GuideInput() { char inName[NUM1]; char inIsbn[NUM1]; char inPrice[NUM2]; char inAuthor[NUM2]; cout << "输入书名" << endl; cin >> inName; cout << "输入ISBN" << endl; cin >> inIsbn; cout << "输入价格" << endl; cin >> inPrice; cout << "输入作者" << endl; cin >> inAuthor; CBook book(inName, inIsbn, inPrice, inAuthor); book.WriteData(); cout << "Write Finish" << endl; WaitUser(); } //浏览全部图书信息 void ViewData(int iSelPage = 1) { int iPage = 0; int iCurPage = 0; int iDataCount = 0; char inName[NUM1]; //存储图书名称的变量 char inIsbn[NUM1]; //存储图书ISBN的变量 char inPrice[NUM2]; char inAuthor[NUM2]; bool bIndex = false; int iFileLength; iCurPage = iSelPage; ifstream ifile; ifile.open("book.dat", ios::binary); iFileLength = GetFileLength(ifile); iDataCount = iFileLength / (NUM1 + NUM1 + NUM2 + NUM2);//文件中总的记录数 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(15) << "Name" << setw(15) << "Isbn"; cout << setw(15) << "Price" << setw(15) << "Author"; cout << endl; try { //根据图书记录编号查找在文件中的位置 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);//清零 memset(inIsbn, 0, 128); memset(inAuthor, 0, 50); memset(inPrice, 0, 50); if (bIndex) cout << setw(3) << ((iCurPage - 1) * 20 + i); ifile.read(inName, NUM1); cout << setw(20) << inName; ifile.read(inIsbn, NUM1); cout<< setw(12) << inIsbn; ifile.read(inPrice, NUM2); cout << setw(14) << inPrice; 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"; //抛出异常 ifile.close(); //异常后关闭文件流 } if (iCurPage < iPage) { iCurPage = iCurPage + 1; WaitView(iCurPage); } else { WaitView(iCurPage); } ifile.close(); } //获取文件大小 long GetFileLength(ifstream &ifs) { long tmppos; long respos; tmppos = ifs.tellg(); //获取文件指针位置 ifs.seekg(0, ios::end); //将文件指针置于文件尾 respos = ifs.tellg(); //获取文件指针位置，即文件大小 ifs.seekg(tmppos, ios::beg); //回复文件指针原来的位置 return respos; } //删除图书 void DeleteBookFromFile() { int iDelCount; cout << "Input delete index" << endl; cin >> iDelCount; CBook tmpbook; tmpbook.DeleteData(iDelCount); cout << "Delete Finish" << endl; WaitUser(); } void WaitView(int iCurPage) { char buf[256]; gets_s(buf); if (buf[0] == 'q') system("exit"); if (buf[0] == 'n') ViewData(iCurPage); } void main() { ShowWelcome(); while (1) { ClearScreen(); ShowWelcome(); ShowRootMenu(); switch (GetSelect()) { case 1: ClearScreen(); GuideInput(); break; case 2: ClearScreen(); ViewData(1); break; case 3: ClearScreen(); DeleteBookFromFile(); break; default: break; } } system("pause"); return; }