二进制文件读写rb与rb+

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二进制的文件读写 rb与 rb+

rb：为输入打开一个二进制文件； 

rb+ 指为读写打开一个二进制文件;

rb为只读，对于不需要进行更新的文件，可以防止用户的错误的写回操作，防止损毁原有数据。具有较高的安全性~~~
rb+为更新二进制文件，可以读取，同时也可以写入，需要用到fseek之类的函数进行配合，以免出错~~~
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FILE* fp = nullptr;
const char* fname = "../test.h264";
fp = fopen(fname, "rb+");<br>if(!fp)<br>{<br>　　std::cout<<"打开文件失败!"<<endl;<br>}

　　

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#ifndef COPYDIR_H
#define COPYDIR_H
 
#include <string>
#include <vector>
 
class CopyDir
{
public:
    CopyDir();
    ~CopyDir();
    void copy(const std::string& srcDirPath, const std::string& desDirPath);
 
public:
 
private:
    bool make_dir(const std::string& pathName);
    //bool mkdir (char const* pathname/*, mode_t mode*/);
    bool get_src_files_name(std::vector<std::string>& fileNameList);
    void do_copy(const std::vector<std::string>& fileNameList);
 
private:
    std::string srcDirPath, desDirPath;
};
 
#endif // COPYDIR_H

　　

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#include "copy_dir.h"
#include <iostream>
#include <fstream>
#include <cstring>
#pragma warning(disable: 4996)
 
#if defined(_WIN32)
#   include <direct.h>
#   include <io.h>
#   include <shlobj.h>
#   include <sys/stat.h>
#   include <sys/types.h>
#else // Linux
#   include <dirent.h>
#   include <unistd.h>
#   include <sys/stat.h>
#   include <sys/types.h>
#   include <pwd.h>
#endif
 
CopyDir::CopyDir()
{
 
}
 
CopyDir::~CopyDir()
{
 
}
 
void CopyDir::copy(const std::string& srcDirPath, const std::string& desDirPath)
{
    this->srcDirPath = srcDirPath;
    std::string srcDir;
#ifdef _WIN32
    int n = 0;
    while (srcDirPath.find('\\', n) != std::string::npos)
    {
        n = srcDirPath.find('\\', n) + 1;
    }
    if (n == 0)
    {
        std::cout << "src path error" << std::endl;
        return;
    }
    srcDir = srcDirPath.substr(n - 1, srcDirPath.size());
 
#else  // Linux
    int n = 0;
    while (srcDirPath.find('/', n) != std::string::npos)
    {
        n = srcDirPath.find('/', n) + 1;
    }
    if (n == 0)
    {
        std::cout << "src path error" << std::endl;
        return;
    }
    srcDir = srcDirPath.substr(n - 1, srcDirPath.size());
 
#endif
    this->desDirPath = desDirPath + srcDir;
 
    if (!make_dir(this->desDirPath))
    {
        return;
    }
 
    std::vector<std::string> fileNameList;
    if (!get_src_files_name(fileNameList))
    {
        return;
    }
 
    if (fileNameList.empty())
    {
        std::cout << "src dir is empty" << std::endl;
        return;
    }
 
    do_copy(fileNameList);
}
 
bool CopyDir::make_dir(const std::string& pathName)
{
    if (access(pathName.c_str(), 0) == -1)  //文件夹不存在则生成一个
    {
        std::cout << pathName << " is not existing" << std::endl;
        std::cout << "now make it" << std::endl;
        #ifdef _WIN32
                if (::_mkdir(pathName.c_str()) < 0)
                {
                    std::cout << "create path error" << std::endl;
                    return false;
                }
        #else  // Linux
                if (::mkdir(pathName.c_str(), S_IRWXU | S_IRGRP | S_IXGRP) < 0)
                {
                    std::cout << "create path error" << std::endl;
                    return false;
                }
        #endif
    }
    return true;   
}
 
bool CopyDir::get_src_files_name(std::vector<std::string>& fileNameList)
{
    #ifdef _WIN32
        _finddata_t file;
        long lf;
        std::string src = this->srcDirPath + "\\*.*";
        if ((lf = _findfirst(src.c_str(), &file)) == -1)
        {
            std::cout << this->srcDirPath << " not found" << std::endl;
            return false;
        }
        else{
            while (_findnext(lf, &file) == 0)
            {
                if (strcmp(file.name, ".") == 0 || strcmp(file.name, "..") == 0)
                    continue;
                fileNameList.push_back(file.name);
            }
        }
        _findclose(lf);
    #else  // Linux
        DIR *dir;
        struct dirent *ptr;
 
        if ((dir = opendir(this->srcDirPath.c_str())) == NULL)
        {
            std::cout << this->srcDirPath << " not found" << std::endl;
            return false;
        }
 
        while ((ptr = readdir(dir)) != NULL)
        {
            if ((ptr->d_name == ".") || (ptr->d_name == ".."))  //current / parent
                continue;
            else if (ptr->d_type == 8)  //file
                fileNameList.push_back(ptr->d_name);
            else if (ptr->d_type == 10)  //link file
                continue;
            else if (ptr->d_type == 4)  //dir
                fileNameList.push_back(ptr->d_name);
        }
        closedir(dir);
 
    #endif
    return true;
}
 
void CopyDir::do_copy(const std::vector<std::string> &fileNameList)
{
#pragma omp parallel for
    for (int i = 0; i < fileNameList.size(); i++)
    {
        std::string nowSrcFilePath, nowDesFilePath;
#ifdef _WIN32
        nowSrcFilePath = this->srcDirPath + "\\" + fileNameList.at(i);
        nowDesFilePath = this->desDirPath + "\\" + fileNameList.at(i);
 
#else
        nowSrcFilePath = this->srcDirPath + "/" + fileNameList.at(i);
        nowDesFilePath = this->desDirPath + "/" + fileNameList.at(i);
 
#endif
        std::ifstream in;
        in.open(nowSrcFilePath, std::ios::binary);
        if (!in)
        {
            std::cout << "open src file : " << nowSrcFilePath << " failed" << std::endl;
            continue;
        }
 
        std::ofstream out;
        out.open(nowDesFilePath, std::ios::binary);
        if (!out)
        {
            std::cout << "create new file : " << nowDesFilePath << " failed" << std::endl;
            in.close();
            continue;
        }
 
        out << in.rdbuf();
 
        out.close();
        in.close();
    }
}

　　

　　

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#ifdef _WIN32
    std::string src = "D:\\a";
    std::string des = "C:";
    CopyDir cd;
    cd.copy(src, des);
#else
    std::string src = "/media/myUbuntu/F/data/test";
    std::string des = "/media/myUbuntu/F/data/test2";
    CopyDir cd;
    cd.copy(src, des);
#endif

　　

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