xml文件 ＜-＞ txt文件 c++

#include <iostream>
#include <fstream*>
#include <string*>
#include <vector*>
#include <algorithm*>

using namespace std;

///实际上四个find函数可合并为一个函数，只需增加两个形参strbegin和strend使用字符串匹配算法即可/
int find_id(const string&);//查找id所在
int find_name(const string&);
int find_course(const string&);
int find_score(const string&);
int ASCALL_TO_INT(const char&);//成绩转换为int型，便于比较
/另外Sortstruct同样可以进行字符串比较 比如a.strlen() 和 b.strlen() 大小 相等则一位位比较/

///学生相关信息类/
class student {//类存储对象
public:
string id;
string name;
string course;
int score = 0;
};

bool Sortstruct(const student*, const student*); //配合sort函数指定vector排序规则

///主函数/
int in_xml_out_txt()
{
ifstream ifs;//创建读文件对象
ofstream ofs;//创建写文件独享
ifs.open(“D:/桌面/book.xml”, ios::in);
ofs.open(“D:/桌面/file.txt”, ios::out | ios::ate);
vector<student*> stuptrs;//创建vector容器保存学生类对象指针  向量可用sort

string a; char temp[20]; memset(temp, '\0', 20);//初始化temp字符串 memset对字符串全部赋值\0 while (getline(ifs, a)){//若到文本末则退出 int i = find_id(a);//调用find函数找到 id所在行 if (i == -1) continue;//如果i=-1；表示当前行不存在id则直接进行下一轮 student* stuptr = new student; stuptrs.push_back(stuptr);//存入vector /*拷贝ID*/ for (int j = 0; j < 7; j++)//学号固定7位数 temp[j] = a[i + j]; stuptr->id = temp;//将temp中的学号保存至当前学生对象 可将char[]直接赋值给 string memset(temp, '\0', 20);//初始化temp； /*拷贝名字*/ getline(ifs, a); i = find_name(a); for (int j = 0; a[i + j] != '<'; j++) temp[j] = a[i + j]; stuptr->name = temp; memset(temp, '\0', 20); /*拷贝课程*/ getline(ifs, a); i = find_course(a); for (int j = 0; a[i + j] != '<'; j++) temp[j] = a[i + j]; stuptr->course = temp; memset(temp, '\0', 20); /*拷贝分数*/ getline(ifs, a); i = find_score(a); for (int j = 0; a[i + j] != '<'; j++) temp[j] = a[i + j]; if (temp[1] == '\0')//调用转换函数确定分数 stuptr->score = ASCALL_TO_INT(temp[0]);//一位数 else if (temp[2] == '\0') stuptr->score = ASCALL_TO_INT(temp[0]) * 10 + ASCALL_TO_INT(temp[1]); else stuptr->score = 100;//满分 memset(temp, '\0', 20); } //调用algorithm头文件中的sort函数，按Sortstruct规则排序 sort(stuptrs.begin(), stuptrs.end(), Sortstruct);//将指针当作数据类型，正常进行交换排序 /*遍历写入txt并删除新建的结构体内存*/ for (auto n : stuptrs) { ofs << n->id << ',' << n->name << ',' << n->course << ',' << n->score << endl; cout<< n->id << ',' << n->name << ',' << n->course << ',' << n->score << endl; delete n; } return 0;

}

int find_id(const string& a) {
int flag = -1;
int i = 0;
for (i; a[i + 3] != ‘\0’; i++) {//
if (a[i] == ‘<’ && a[i + 1] == ‘i’ && a[i + 2] == ‘d’ && a[i + 3] == ‘>’) {
flag = i + 4;
break;
}
}
return flag;//返回的非 -1说明这一行是数据开头 学号
}
int find_name(const string& a) {
int flag = -1;
int i = 0;
for (i; a[i + 5] != ‘\0’; i++) {
if (a[i] == ‘<’ && a[i + 1] == ‘n’ && a[i + 2] == ‘a’ && a[i + 3] == ‘m’ && a[i + 4] == ‘e’ && a[i + 5] == ‘>’) {
flag = i + 6;
break;
}
}
return flag;
}
int find_course(const string& a) {
int flag = -1;
int i = 0;
for (i; a[i + 7] != ‘\0’; i++) {
if (a[i] == ‘<’ && a[i + 1] == ‘c’ && a[i + 2] == ‘o’ && a[i + 3] == ‘u’ && a[i + 4] == ‘r’ && a[i + 5] == ‘s’ && a[i + 6] == ‘e’ && a[i + 7] == ‘>’) {
flag = i + 8;
break;
}
}
return flag;
}
int find_score(const string& a) {
int flag = -1;
int i = 0;
for (i; a[i + 6] != ‘\0’; i++) {
if (a[i] == ‘<’ && a[i + 1] == ‘s’ && a[i + 2] == ‘c’ && a[i + 3] == ‘o’ && a[i + 4] == ‘r’ && a[i + 5] == ‘e’ && a[i + 6] == ‘>’) {
flag = i + 7;
break;
}
}
return flag;
}

int ASCALL_TO_INT(const char& ASCALL)
{
return ASCALL - ‘0’;//将一位的 char转为int数字
}

bool Sortstruct(const student* stu1, const student* stu2)
{//排序函数 设置为降序
return stu1->score > stu2->score;// 不传这个函数也能对结构体进行比较(升序)？？？
}

bool Sortstruct_asc(const student* stu1, const student* stu2)
{//排序函数 设置为升序
return stu1->score < stu2->score;//
}

//读入txt 并根据最后一列大小排序 后写入xml文件

int find_1(char str[]) {//找到第1个’,‘所在位置
int position = 0;
while (str[position]!=’\0’) {
if (str[position++] == ‘,’) {
break;
}
}
return position;
}
int find_2(char str[]) {//找到第2个’,‘所在位置
int position = 0; int count = 0;
while (str[position] != ‘\0’) {
if (str[position++] == ‘,’) {
count++;
if (count == 2)break;
}
}
return position;
}
int find_3(char str[]) {//找到第3个’,'所在位置
int position = 0; int count = 0;
while (str[position] != ‘\0’) {
if (str[position++] == ‘,’) {
count++;
if (count == 3)break;
}
}
return position;
}

void in_txt_out_xml() {
FILE* p;
fopen_s(&p, “D:/桌面/file.txt”, “r”);
if (p == nullptr)cout << “read error”;
vector<student*> stuptrs;//创建vector容器保存学生类对象指针  向量可用sort

char str[60]; memset(str, '\0', 60);//初始化 char t[20]; memset(t, '\0', 20); while (fgets(str, 60, p)) { cout << str; int i = 0; int position1 = find_1(str);//找到姓名所在位置 int position2 = find_2(str);//找到课程所在位置 int position3 = find_3(str);//找到分数所在位置 //cout << position1 << " " << position2 <<" "<< position3<<endl; //student* s = (student*)malloc(sizeof(student)); //×会报错 student* s = new student;//√ stuptrs.push_back(s); while (i < 7) { t[i] = str[i]; i++; } s->id = t;//得到学号 memset(t, '\0', 20);//以 \0 初始化 i = 0; while (str[i + position1]!=',') { t[i] = str[i + position1]; i++; }s->name = t; i = 0; memset(t, '\0', 20); while (str[i + position2]!=',') { t[i] = str[i + position2 ]; i++; }s->course = t; i = position3; memset(t, '\0', 20);//分数 //cout << str[i+2]<<endl; int grade = 0;//最后一个是换行符 而不是\0! if (str[i + 2] != '\n') { grade = 100; } else if(str[i + 1] != '\n'){ grade = 10 * ASCALL_TO_INT(str[i]) + ASCALL_TO_INT(str[i + 1]); } else grade = ASCALL_TO_INT(str[i]);//将单个char转为int s->score = grade; memset(t, '\0', 20); } fclose(p); cout << endl; sort(stuptrs.begin(), stuptrs.end(), Sortstruct_asc);//默认升序，降序排列+ ,Sortstruct_asc //fopen_s(&p, "D:/桌面/file.txt", "w"); fwrite(str,sizeof(str),1, p); ofstream ofs;//创建写文件独享 ofs.open("D:/桌面/inXml.xml", ios::out | ios::ate);//写入txt ofs << "<grades>" << endl; for (auto n : stuptrs) { ofs << "<grade>" << endl; ofs << "<id>" << n->id << "</id>" << endl; ofs << "<name>" << n->name << "</name>" << endl; ofs << "<course>" << n->course << "</course>" << endl; ofs << "<score>" << n->score << "</score>" << endl; cout << n->id << ',' << n->name << ',' << n->course << ',' << n->score << endl; delete n; ofs << "</grade>" << endl; } ofs << "</grades>" << endl;

}

int main() {

in_xml_out_txt();//读入xml 输出为txt cout << endl; in_txt_out_xml();//读入txt 输出为xml return 1;

}