ansi utf8 unicode 三者之间相互转换

1、 ANSI->UTF8
转载地址：https://www.jianshu.com/p/1d54f59f8785

 1 #include <iostream>
#include <string>
#include <fstream>

using std::string;
using namespace std;

wchar_t* AnsiToUnicode(char *sAnsi) 
{

    //ansi to unicode
    int sLen = MultiByteToWideChar(CP_ACP, NULL, sAnsi, -1, NULL, 0); 
    wchar_t* sUnicode = new wchar_t[sLen];
    //wchar_t* sUnicode = (wchar_t*)malloc(sLen*sizeof(wchar_t));
    MultiByteToWideChar(CP_ACP, NULL, sAnsi, -1, sUnicode, sLen);


    return sUnicode;
    //delete[] sUnicode; 
    //sUnicode =NULL; 
    //free(sUnicode);
}

char *UnicodeToUtf8(wchar_t *sUnicode)
{
    int sLen = WideCharToMultiByte(CP_UTF8, NULL, sUnicode, -1, NULL, 0, NULL, NULL); 
    //UTF8虽然是Unicode的压缩形式，但也是多字节字符串，所以可以以char的形式保存 
    char* sUtf8 = new char[sLen];  
    //unicode版对应的strlen是wcslen 
    WideCharToMultiByte(CP_UTF8, NULL, sUnicode, -1, sUtf8, sLen, NULL, NULL); 
    printf("");
    return sUtf8;
    /*delete[] sUtf8; 
    sUtf8 =NULL; */
}


//ansi转换为utf-8
char *AnsiToUtf8(char *sAnsi){
    wchar_t *unicode = AnsiToUnicode(sAnsi);
    free(sAnsi);

    if(unicode != NULL){
        /*setlocale(LC_ALL,"chs");
        wprintf(L"%s
",unicode);*/

        char *utf_8 = UnicodeToUtf8(unicode);
        if(utf_8){
            free(unicode);
            return utf_8;
        }
        else{
            free(unicode);
            return NULL;
        }
    }else
        return NULL;
    
}

 2、UTF8->ANSI

来源：https://blog.csdn.net/baidu_41793719/article/details/104316708

wchar_t *utf_8ToUnicode(char *u8s)
{
    int wcsLen = MultiByteToWideChar(CP_UTF8, NULL, u8s, strlen(u8s), NULL, NULL);
    wchar_t *wcString = new wchar_t[wcsLen + 1];
    MultiByteToWideChar(CP_UTF8, NULL, u8s, strlen(u8s), wcString, wcsLen);
    wcString[wcsLen] = '';
    return wcString;
}

char *unicodeToAnsi(wchar_t *wcString)
{
    int len = WideCharToMultiByte(CP_ACP, NULL, wcString, -1, NULL, NULL, NULL, NULL);
    char *str = new char[len];
    WideCharToMultiByte(CP_ACP, NULL, wcString, -1, str, len, NULL, NULL);
    return str;
}

char* UTF8ToAnsi(char* u8s)
{
    wchar_t* pW = utf_8ToUnicode(u8s);
    return unicodeToAnsi(pW);
    delete pW;
}