utf8编码与GB2312编码的转换(C++)

#include "stdafx.h"
#include 
#include 
#include 
#include 
#include 

using namespace std;

//UTF-8到GB2312的转换
char* U2G(const char* utf8)
{
	int len = MultiByteToWideChar(CP_UTF8, 0, utf8, -1, NULL, 0);
	wchar_t* wstr = new wchar_t[len+1];
	memset(wstr, 0, len+1);
	MultiByteToWideChar(CP_UTF8, 0, utf8, -1, wstr, len);
	len = WideCharToMultiByte(CP_ACP, 0, wstr, -1, NULL, 0, NULL, NULL);
	char* str = new char[len+1];
	memset(str, 0, len+1);
	WideCharToMultiByte(CP_ACP, 0, wstr, -1, str, len, NULL, NULL);
	if(wstr) delete[] wstr;
	return str;
}

//GB2312到UTF-8的转换
char* G2U(const char* gb2312)
{
	int len = MultiByteToWideChar(CP_ACP, 0, gb2312, -1, NULL, 0);
	wchar_t* wstr = new wchar_t[len+1];
	memset(wstr, 0, len+1);
	MultiByteToWideChar(CP_ACP, 0, gb2312, -1, wstr, len);
	len = WideCharToMultiByte(CP_UTF8, 0, wstr, -1, NULL, 0, NULL, NULL);
	char* str = new char[len+1];
	memset(str, 0, len+1);
	WideCharToMultiByte(CP_UTF8, 0, wstr, -1, str, len, NULL, NULL);
	if(wstr) delete[] wstr;
	return str;
}

#if 0

#ifdef _WIN32
#include 

string GbkToUtf8(const char *src_str)
{
	int len = MultiByteToWideChar(CP_ACP, 0, src_str, -1, NULL, 0);
	wchar_t* wstr = new wchar_t[len + 1];
	memset(wstr, 0, len + 1);
	MultiByteToWideChar(CP_ACP, 0, src_str, -1, wstr, len);
	len = WideCharToMultiByte(CP_UTF8, 0, wstr, -1, NULL, 0, NULL, NULL);
	char* str = new char[len + 1];
	memset(str, 0, len + 1);
	WideCharToMultiByte(CP_UTF8, 0, wstr, -1, str, len, NULL, NULL);
	string strTemp = str;
	if (wstr) delete[] wstr;
	if (str) delete[] str;
	return strTemp;
}

string Utf8ToGbk(const char *src_str)
{
	int len = MultiByteToWideChar(CP_UTF8, 0, src_str, -1, NULL, 0);
	wchar_t* wszGBK = new wchar_t[len + 1];
	memset(wszGBK, 0, len * 2 + 2);
	MultiByteToWideChar(CP_UTF8, 0, src_str, -1, wszGBK, len);
	len = WideCharToMultiByte(CP_ACP, 0, wszGBK, -1, NULL, 0, NULL, NULL);
	char* szGBK = new char[len + 1];
	memset(szGBK, 0, len + 1);
	WideCharToMultiByte(CP_ACP, 0, wszGBK, -1, szGBK, len, NULL, NULL);
	string strTemp(szGBK);
	if (wszGBK) delete[] wszGBK;
	if (szGBK) delete[] szGBK;
	return strTemp;
}
#else
#include 

int GbkToUtf8(char *str_str, size_t src_len, char *dst_str, size_t dst_len)
{
	iconv_t cd;
	char **pin = &str_str;
	char **pout = &dst_str;

	cd = iconv_open("utf8", "gbk");
	if (cd == 0)
		return -1;
	memset(dst_str, 0, dst_len);
	if (iconv(cd, pin, &src_len, pout, &dst_len) == -1)
		return -1;
	iconv_close(cd);
	*pout = '\0';

	return 0;
}

int Utf8ToGbk(char *src_str, size_t src_len, char *dst_str, size_t dst_len)
{
	iconv_t cd;
	char **pin = &src_str;
	char **pout = &dst_str;

	cd = iconv_open("gbk", "utf8");
	if (cd == 0)
		return -1;
	memset(dst_str, 0, dst_len);
	if (iconv(cd, pin, &src_len, pout, &dst_len) == -1)
		return -1;
	iconv_close(cd);
	*pout = '\0';

	return 0;
}


#endif

#endif

 

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