1. 关键词
C++ 数据格式化 字符串处理 std::string 文件大小 跨平台
2. strfmt.h
| #pragma once |
| |
| #include <string> |
| #include <cstdint> |
| #include <sstream> |
| #include <iomanip> |
| |
| namespace cutl |
| { |
| |
| |
| |
| |
| |
| |
| |
| |
| std::string fmt_filesize(uint64_t size, bool simplify = true, int precision = 1); |
| } |
3. strfmt.cpp
| #include <sstream> |
| #include <iomanip> |
| #include <bitset> |
| #include "strfmt.h" |
| |
| namespace cutl |
| { |
| std::string fmt_filesize(uint64_t size, bool simplify, int precision) |
| { |
| static const double KBSize = 1024; |
| static const double MBSize = 1024 * 1024; |
| static const double GBSize = 1024 * 1024 * 1024; |
| const std::string gb = simplify ? "G" : "GB"; |
| const std::string mb = simplify ? "M" : "MB"; |
| const std::string kb = simplify ? "K" : "KB"; |
| const std::string byte = simplify ? "B" : "Byte"; |
| |
| if (size > GBSize) |
| { |
| double hSize = (double)size / GBSize; |
| return fmt_double(hSize, precision) + gb; |
| } |
| else if (size > MBSize) |
| { |
| double hSize = (double)size / MBSize; |
| return fmt_double(hSize, precision) + mb; |
| } |
| else if (size > KBSize) |
| { |
| double hSize = (double)size / KBSize; |
| return fmt_double(hSize, precision) + kb; |
| } |
| else |
| { |
| return fmt_double(size, precision) + byte; |
| } |
| |
| return ""; |
| } |
| } |
4. 测试代码
| #include "common.hpp" |
| #include "strfmt.h" |
| |
| void TestFormatFileSize() |
| { |
| PrintSubTitle("TestFormatFileSize"); |
| |
| std::cout << "fmt_filesize 1: " << cutl::fmt_filesize(378711367) << std::endl; |
| std::cout << "fmt_filesize 2: " << cutl::fmt_filesize(378711367, true, 2) << std::endl; |
| std::cout << "fmt_filesize 2: " << cutl::fmt_filesize(378711367, false, 2) << std::endl; |
| } |
5. 运行结果
| -----------------------------------------TestFormatFileSize----------------------------------------- |
| fmt_filesize 1: 361.2M |
| fmt_filesize 2: 361.17M |
| fmt_filesize 2: 361.17MB |
6. 源码地址
更多详细代码,请查看本人写的C++ 通用工具库: common_util, 本项目已开源,代码简洁,且有详细的文档和Demo。
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