C++實現編碼轉換的示例程式碼
阿新 • • 發佈:2020-08-15
程式碼地址
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幾乎可以實現一套程式碼,在linux和windows都能使用,但實際會有很多坑,相當於程式碼幾乎不改,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,然後選擇不同的系統api進行編碼轉換。
實現
目前只實現Windows下的編碼轉換,以後需要在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。
// 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->Unicode int ansi2uni(const std::string& ansi,std::wstring& uni); // Unicode->ANSI int uni2ansi(const std::wstring& uni,std::string& ansi); // UTF8->Unicode int utf82uni(const std::string& utf8,std::wstring& uni); // Unicode->UTF8 int uni2utf8(const std::wstring& uni,std::string& utf8); // ANSI->UTF8 int ansi2utf8(const std::string& ansi,std::string& utf8); // UTF8->ANSI int utf82ansi(const std::string& utf8,std::string& ansi); } // namespace gconvert
//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> #endif namespace gconvert { #ifdef _WIN32 static int multi2uni(const std::string& multi,std::wstring& uni,UINT code) { auto len = MultiByteToWideChar(code,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,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,uni.c_str(),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,len,nullptr); multi.assign(buf); delete[]buf; buf = nullptr; return len; } #endif // ANSI->Unicode int ansi2uni(const std::string& ansi,std::wstring& uni) { #ifdef _WIN32 return multi2uni(ansi,uni,CP_ACP); #endif return 0; } // Unicode->ANSI int uni2ansi(const std::wstring &uni,std::string &ansi) { #ifdef _WIN32 return uni2multi(uni,ansi,CP_ACP); #endif return 0; } // UTF8->Unicode int utf82uni(const std::string& utf8,std::wstring& uni) { #ifdef _WIN32 return multi2uni(utf8,CP_UTF8); #endif return 0; } // Unicode->UTF8 int uni2utf8(const std::wstring& uni,std::string& utf8) { #ifdef _WIN32 return uni2multi(uni,utf8,CP_UTF8); #endif return 0; } // ANSI->UTF8 int 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->ANSI int 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
//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; }
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