代碼地址
https://github.com/gongluck/Code-snippet/tree/master/cpp/code%20conversion
需求
編碼轉換在實際開發中經常遇到，通常是ANSI、Unicode和Utf-8之間相互轉換。實現也有很多種，有查表法、使用C++11、使用boost、使用系統API。C++11和boost幾乎可以實現一套代碼，在linux和windows都能使用，但實際會有很多坑，相當于代碼幾乎不改，但是要改一下系統環境。所以有一種實現就是判斷系統的版本，然后選擇不同的系統api進行編碼轉換。
實現
目前只實現Windows下的編碼轉換，以后需要在linux下使用編碼轉換再做補充。windows下的編碼轉換基本圍繞unicode做處理。例如ANSI->UTF-8，就是先將ANSI->unicode，再將unicode->UTF-8。
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// convert.h/* * @Author: gongluck * @Date: 2020-03-23 16:06:23 * @Last Modified by: gongluck * @Last Modified time: 2020-03-23 16:09:30 */// Character encoding conversion#pragma once#include <string>namespace gconvert{// ANSI->Unicodeint ansi2uni(const std::string& ansi, std::wstring& uni);// Unicode->ANSIint uni2ansi(const std::wstring& uni, std::string& ansi);// UTF8->Unicodeint utf82uni(const std::string& utf8, std::wstring& uni);// Unicode->UTF8int uni2utf8(const std::wstring& uni, std::string& utf8);// ANSI->UTF8int ansi2utf8(const std::string& ansi, std::string& utf8);// UTF8->ANSIint utf82ansi(const std::string& utf8, std::string& ansi);} // namespace gconvert |
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//convert.cpp/* * @Author: gongluck * @Date: 2020-03-23 16:13:01 * @Last Modified by: gongluck * @Last Modified time: 2020-03-23 16:34:50 */#include "convert.h"#include <iostream>#ifdef _WIN32#include <windows.h>#endifnamespace gconvert{#ifdef _WIN32 static int multi2uni(const std::string& multi, std::wstring& uni, UINT code) { auto len = MultiByteToWideChar(code, 0, multi.c_str(), -1, nullptr, 0); if (len <= 0) { std::cerr << __FILE__ << " : " << __LINE__ << " : " << GetLastError() << std::endl; return -1; } WCHAR* buf = new WCHAR[len]; if (buf == nullptr) { std::cerr << __FILE__ << " : " << __LINE__ << " : " << "can not new buf, size : " << len << std::endl; return -2; } len = MultiByteToWideChar(code, 0, multi.c_str(), -1, buf, len); uni.assign(buf); delete[]buf; buf = nullptr; return len; } static int uni2multi(const std::wstring& uni, std::string& multi, UINT code) { auto len = WideCharToMultiByte(code, 0, uni.c_str(), -1, nullptr, 0, nullptr, nullptr); if (len <= 0) { std::cerr << __FILE__ << " : " << __LINE__ << " : " << GetLastError() << std::endl; return -1; } CHAR* buf = new CHAR[len]; if (buf == nullptr) { std::cerr << __FILE__ << " : " << __LINE__ << " : " << "can not new buf, size : " << len << std::endl; return -2; } len = WideCharToMultiByte(code, 0, uni.c_str(), -1, buf, len, nullptr, nullptr); multi.assign(buf); delete[]buf; buf = nullptr; return len; }#endif// ANSI->Unicodeint ansi2uni(const std::string& ansi, std::wstring& uni){#ifdef _WIN32 return multi2uni(ansi, uni, CP_ACP);#endif return 0;}// Unicode->ANSIint uni2ansi(const std::wstring &uni, std::string &ansi){#ifdef _WIN32 return uni2multi(uni, ansi, CP_ACP);#endif return 0;}// UTF8->Unicodeint utf82uni(const std::string& utf8, std::wstring& uni){#ifdef _WIN32 return multi2uni(utf8, uni, CP_UTF8);#endif return 0;}// Unicode->UTF8int uni2utf8(const std::wstring& uni, std::string& utf8){#ifdef _WIN32 return uni2multi(uni, utf8, CP_UTF8);#endif return 0;}// ANSI->UTF8int ansi2utf8(const std::string &ansi, std::string &utf8){ std::wstring uni; auto len = ansi2uni(ansi, uni); if (len <= 0) { return -3; } return uni2utf8(uni, utf8);}// UTF8->ANSIint utf82ansi(const std::string &utf8, std::string &ansi){ std::wstring uni; auto len = utf82uni(utf8, uni); if (len <= 0) { return -3; } return uni2ansi(uni, ansi);}} // namespace gconvert |
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//testcode#include <iostream>#include "../code conversion/convert.h"int main(){ std::string ansi = "你好，世界！"; std::wstring uni; std::string utf8; ret = gconvert::ansi2uni(ansi, uni); ret = gconvert::ansi2utf8(ansi, utf8); ret = gconvert::uni2ansi(uni, ansi); ret = gconvert::uni2utf8(uni, utf8); ret = gconvert::utf82ansi(utf8, ansi); ret = gconvert::utf82uni(utf8, uni); return 0;} |
以上就是C++實現編碼轉換的示例代碼的詳細內容，更多關于C++實現編碼轉換的資料請關注服務器之家其它相關文章！
原文鏈接：https://cloud.tencent.com/developer/article/1604693
