c++ 常用函数

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#pragma once
 
#include <iostream>  
#include <io.h>
#include <direct.h>
#include <time.h>
#include <string>
#include <vector>
 
#include <windows.h>
 
using namespace std;
 
//读取某给定路径下所有文件夹与文件名称，并带完整路径
static void getAllFilesInDirs(string path, vector<string>& fileFullpath) {
 
    _finddata_t fileInfo;
    //将string转化为const char*类型 
    string path1 = path + "\\*.*";
    intptr_t fileHandle = _findfirst(path1.c_str(), &fileInfo);
    //读取第一个文件信息 文件句柄类型为long会出现不兼容[Win10平台用long声明文件句柄会crash] 
    string f;
    if (fileHandle == -1) {
        cout << "error\n";
        return;
    }
    while (_findnext(fileHandle, &fileInfo) == 0) {
 
        if (fileInfo.attrib & _A_SUBDIR) {
            if (strcmp(fileInfo.name, ".") == 0 || strcmp(fileInfo.name, "..") == 0)  continue;
            string newPath = path + "\\" + fileInfo.name;
            getAllFilesInDirs(newPath, fileFullpath);
        }
        else {
            f = path + string("\\") + string(fileInfo.name);
            fileFullpath.push_back(f);
        }
    };
    _findclose(fileHandle);
}
 
 
// 获取文件后缀名
static string getExtension(string filename) {
    return filename.substr(filename.find_last_of('.'));
}
 
// 获取文件名，不包含目录
static string getFilename(string file_fullpath) {
    return file_fullpath.substr(file_fullpath.find_last_of('\\') + 1);
}
 
//获取文件名，不包含目录和后缀名
static string getFilenameNoExt(string filename) {
    filename = getFilename(filename);
    return filename.substr(0, filename.find_last_of('.'));
}
 
 
////读取某给定路径下后缀名为format得文件名称，并带完整路径
static void getAllFilesByformat(string path, vector<string>& fileFullpath, string format) {
    _finddata_t fileInfo;
    //将string转化为const char*类型 
    string path1 = path + "\\*.*";
    intptr_t fileHandle = _findfirst(path1.c_str(), &fileInfo);
    //读取第一个文件信息 文件句柄类型为long会出现不兼容[Win10平台用long声明文件句柄会crash] 
    string f;
    if (fileHandle == -1) {
        cout << "error\n";
        return;
    }
    while (_findnext(fileHandle, &fileInfo) == 0) {
 
        if (fileInfo.attrib & _A_SUBDIR) {
            if (strcmp(fileInfo.name, ".") == 0 || strcmp(fileInfo.name, "..") == 0)  continue;
            string newPath = path + "\\" + fileInfo.name;
            getAllFilesByformat(newPath, fileFullpath, format);
        }
        else {
            if (getExtension(fileInfo.name) == format)
            {
                f.clear();
                f = path + string("\\") + string(fileInfo.name);
                fileFullpath.push_back(f);
            }
        }
    };
    _findclose(fileHandle);
}
 
 
 
// 字符串分割到 vector
static vector<string> string_split(const string& str, const string& delim) {
    vector<string> res;
    if ("" == str) return res;
    //先将要切割的字符串从string类型转换为char*类型  
    char * strs = new char[str.length() + 1]; //不要忘了  
    strcpy(strs, str.c_str());
 
    char * d = new char[delim.length() + 1];
    strcpy(d, delim.c_str());
 
    char *p = strtok(strs, d);
    while (p) {
        string s = p; //分割得到的字符串转换为string类型  
        res.push_back(s); //存入结果数组  
        p = strtok(NULL, d);
    }
    return res;
}
 
 
// 递归创建文件夹
static int self_mkdirs(string filename) {
    filename += "\\";
    char *fileName = (char*)filename.c_str();
    char *tag;
    int a = 0;
    for (tag = fileName; *tag; tag++, a++)
    {
        if (*tag == '\\')
        {
            string new_path = filename.substr(0, a + 1);
 
            if (_access(new_path.c_str(), 0) == -1) //如果文件夹不存在
                _mkdir(new_path.c_str());               //则创建
        }
    }
 
    return 0;
}
 
// 文件是否存在
static bool exist_file(string filename) {
    return _access(filename.c_str(), 4) == 0;
}
 
// 打乱vector
static vector<string> vector_shuffle(vector<string> v1) {
    vector<string> v2;
    // 复制
    v2.assign(v1.begin(), v1.end());
    //打乱
    random_shuffle(v2.begin(), v2.end());
 
    return v2;
}
 
 
///替换指定字符串
static string  replace_all(string str, const string& old_value, const string& new_value)
{
    string str1 = "";
    while (true) {
        string::size_type   pos(0);
        if ((pos = str.find(old_value)) != string::npos)
            str1 = str.replace(pos, old_value.length(), new_value);
        else   break;
    }
    return   str1;
}
 
 
static std::string GetTime() {
    time_t timep;
    time(&timep);
    char tmp[64];
    strftime(tmp, sizeof(tmp), "%Y-%m-%d %H:%M:%S", localtime(&timep));
    return tmp;
}