如何解析输入文件？ [英] How can I parse an input file?

问题描述

我无法理解如何从文件中读取。这是文件：



随机大小：3

人数：2

0 :: Person1： ：2 :: 0

1 :: Person2 :: 2 :: 2



有人可以帮帮我吗？

这是我做的垃圾：



我尝试过的事情：

I just cant understand how to read from the file. Here is the file:

Random Size: 3
Person Count: 2
0::Person1::2::0
1::Person2::2::2

Can somebody help me please?
And here is the garbage i did:

What I have tried:

std::pair<int, std::vector<Person *> *> parseFileWithName(const std::string& filename){
	int bsiz;
	int pc;
	std::ifstream fil(filename);
	std::vector<Player *> *ow;
	if(fil.is_open()){
		std::string line,np1,np2,np3,np4;
		int bsiz;
		int pc;
		std::getline(filename,line);
		std::istringstream lili(line);
		lili>>np1>>np2>>bsiz;
		std::getline(filename,line);
		std::istringstream pf(line);
		pf>>np3>>np4>>pc;
		while(pc!=0){
			std::getline(filename,line);
			std::string type,nt,ny,nu;
			uint id;
			int xco;
			int yco;
			std::istringstream lineStream(line);
			std::getline(lineStream,id,':');
			std::getline(lineStream,nt,':');
			std::getline(lineStream,type,':');
			std::getline(lineStream,ny,':');
			std::getline(lineStream,xco,':');
			std::getline(lineStream,nu,':');
			lineStream>>yco;
			Person *p1=new Person(id,xco,yco);
			ow->push_back(p1);
			pc--;
		}
	}
	std::pair<int, std::vector<Person *> *> pp(bsiz,ow);
	return pp;
	
}

推荐答案

您应该与该文件的创建者交谈。看起来你有这样的结构化数据：



1.标题（全局信息）

a）随机值的最大值

b）记录数（人数）



2.数据（序列化人数为1b）



第一步：读第一行=>解析随机数

第二步：读第二行=>解析人数

第三步：为人们使用for循环并将其存储在向量中。



仅打开文件< b>一次一行一行地读取。阅读有关基本文件I / O 的教程，以便更好地理解。在示例应用程序中运行代码并进行调试。

You should speak with the creator of that file. It looks like you have structured data like that:

1. Header (global information)
a) a maximal value for random values
b) the count of records (of Persons)

2. the data (serialized persons with count of 1b)

First step: read first line => parse the random number
Second step: read second line => parse the person count
Third step: use a for loop for the persons and store them in the vector.

Open the file only once to read line after line til eof. Read the tutorial on Basic file I/O for better understanding. Run the code in a sample app and debug it.

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