C++中UTF-8与GB2312相互转换

UTF-8转GB2312

// UTF-8转换为GB2312
static char* Utf8ToGB2312(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;
		wstr = NULL;
	}
	return str;
}

GB2312转UTF-8

// GB2312转换为UTF-8
static char* GB2312ToUtf8(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;
}