Commonly used in C++ (string splitting, judging whether a file exists, converting to string)

//Record commonly used statements, add them as you use them

Table of contents

 

1. String splitting

the first method

2. Determine whether the file exists

3. Convert string

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1. String splitting

the first method

/*
函数功能：将输入的字符串(或者从文件读取的)进行拆分，存放到vector向量中
参数一：待分割的字符串
参数二：以sep分割 例如sep=' '(空格),则以空格字符分割字符串
*/
vector<int> inputdata(string str,char sep)
{
	vector<int> dataVec;//
	//将输入的string类型进行字符分割，放入vector中
	int flagSub = 0;
	for (int i = 0; i < str.length(); i++) 
	{
		if (str[i] == sep)
		{
			int temp = stof(str.substr(flagSub, i - flagSub));
			//cout << "temp = " << temp << endl;
			dataVec.push_back(temp);
			flagSub = i + 1;
		}
	}
	return dataVec;
}

 

 

2. Determine whether the file exists

//首先判断图片文件是否存在
const char* rgbexit = rgbpaths.data();
//access()函数----如果存在返回0，不存在返回-1
if (access(rgbexit, 0) == -1)//如果不存在，就返回
{
    return 1;//return 1 说明没有图片
}

3. Convert string

//将int类型转换为字符串
int i = 5;
string path;
path = "F:\\Depth\\" + to_string(i)+".png";