C++实现uft8和gbk编码字符串互相转换

#include <iostream>
#include <stdlib.h>
#include <string.h>
#include <string>
 
#ifdef _WIN32
#include <Windows.h>
#else
#include <iconv.h>
#endif
 
#ifdef _WIN32
std::string Utf8ToGbk(const char* src_str)
{
    std::string result;
    wchar_t* strSrc;
    char* szRes;
    int len = MultiByteToWideChar(CP_UTF8, 0, src_str, -1, NULL, 0);
    strSrc = new wchar_t[len + 1];
    MultiByteToWideChar(CP_UTF8, 0, src_str, -1, strSrc, len);
 
    len = WideCharToMultiByte(CP_ACP, 0, strSrc, -1, NULL, 0, NULL, NULL);
    szRes = new char[len + 1];
    WideCharToMultiByte(CP_ACP, 0, strSrc, -1, szRes, len, NULL, NULL);
    result = szRes;
    if(strSrc) 
        delete[]strSrc;
    if(szRes)
        delete[]szRes;
    return result;
}
 
 
std::string GbkToUtf8(const char* src_str)
{
    std::string result;
    wchar_t* strSrc;
    char* szRes;
    int len = MultiByteToWideChar(CP_ACP, 0, src_str, -1, NULL, 0);
    strSrc = new wchar_t[len + 1];
    MultiByteToWideChar(CP_ACP, 0, src_str, -1, strSrc, len);
 
    len = WideCharToMultiByte(CP_UTF8, 0, strSrc, -1, NULL, 0, NULL, NULL);
    szRes = new char[len + 1];
    WideCharToMultiByte(CP_UTF8, 0, strSrc, -1, szRes, len, NULL, NULL);
    result = szRes;
    if (strSrc)
        delete[]strSrc;
    if (szRes)
        delete[]szRes;
    return result;
}
#else
int code_convert(char *from_charset, char *to_charset, char *inbuf, size_t inlen, char *outbuf, size_t outlen)
{
    iconv_t cd;
    int rc;
    char **pin = &inbuf;
    char **pout = &outbuf;
 
    cd = iconv_open(to_charset, from_charset);
    if (cd == 0) return -1;
    memset(outbuf, 0, outlen);
    if (iconv(cd, pin, &inlen, pout, &outlen) == -1) return -1;
    iconv_close(cd);
    return 0;
}
int GbkToUtf8(char *inbuf, size_t inlen, char *outbuf, size_t outlen)
{
    return code_convert("gb2312", "utf-8", inbuf, inlen, outbuf, outlen);
}
int Utf8ToGbk(char *inbuf, size_t inlen, char *outbuf, size_t outlen)
{
    return code_convert("utf-8", "gb2312", inbuf, inlen, outbuf, outlen);
}
#endif
 
int main()
{
    std::string teststr = "测试字符串";
    std::cout << "原始字符串：" << teststr.c_str() << std::endl;
#ifdef _WIN32
    std::cout << Utf8ToGbk(GbkToUtf8(teststr.c_str()).c_str()) << std::endl;
#else
    char result_g[1024];
    GbkToUtf8((char*)teststr.c_str(), strlen(teststr.c_str()), result_g, 1024);
    char result_u[1024];
    Utf8ToGbk(result_g, strlen(result_g), result_u, 1024);
    std::cout << result_g << std::endl;
    std::cout << result_u << std::endl;
#endif
    return 0;
}

转自：C++实现uft8和gbk编码字符串互相转换_std::string 转码gbk_baozhatoudale的博客-CSDN博客