c++中gbk和utf-8互转

gbk转utf-8

char* G2U(const char* gb2312)
{
	ASSERT(gb2312!=NULL);
	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];//需要在外面析构，可以改成传指针进来的方式
	memset(str, 0, len + 1);
	WideCharToMultiByte(CP_UTF8, 0, wstr, -1, str, len, NULL, NULL);
	if (wstr) delete[] wstr;
	return str;
}

utf-8转gbk

const char* UTF8_To_GBK(const char* source, char* pcDes)
{
	enum { GB2312 = 936 };
	//unsigned long len;
	int len=-1;
	len  = ::MultiByteToWideChar(CP_UTF8, NULL, source, -1, NULL, NULL);
	if (len == 0)
		return NULL;
	wchar_t *wide_char_buffer = new wchar_t[len];
	::MultiByteToWideChar(CP_UTF8, NULL, source, -1, wide_char_buffer, len);
	len = ::WideCharToMultiByte(GB2312, NULL, wide_char_buffer, -1, NULL, NULL, NULL, NULL);
	if (len == 0)
	{
		delete[] wide_char_buffer;
		return NULL;
	}
	char *multi_byte_buffer = new char[len];
	::WideCharToMultiByte(GB2312, NULL, wide_char_buffer, -1, multi_byte_buffer, len, NULL, NULL);
	strcpy(pcDes, multi_byte_buffer);
	//std::string dest(multi_byte_buffer);
	delete[] multi_byte_buffer;
	delete[] wide_char_buffer;
	return pcDes;
}

建议

上面两个函数可以实现功能，但都不是好的写法。建议将函数参数写成memcpy那样