Utf8,Unicode,多字节等一些字符集的处理函数_unicode utf8 多字符集-优快云博客

本文介绍了几种字符编码之间的转换方法，包括从wchar_t到char、从char到wchar_t的转换，以及UTF-8编码到Unicode和ANSI编码的转换过程。通过具体的C/C++代码示例，展示了如何实现这些转换，并提供了动态内存管理的方法。

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char 2 wchar & wchar 2 char

//动态释放内存
void Release()
{
	if (m_char)
	{
		delete m_char;
		m_char = NULL;
	}
	if (m_wchar)
	{
		delete m_wchar;
		m_wchar = NULL;
	}
}

//wchar_t TO char
char* WcharToChar(const wchar_t* wp)
{
	Release();
	int len = WideCharToMultiByte(CP_ACP, 0, wp, wcslen(wp), NULL, 0, NULL, NULL);
	m_char = new char[len + 1];
	WideCharToMultiByte(CP_ACP, 0, wp, wcslen(wp), m_char, len, NULL, NULL);
	m_char[len] = '\0';
	return m_char;
}

//char TO wchar_t
wchar_t* CharToWchar(const char* c)
{
	Release();
	int len = MultiByteToWideChar(CP_ACP, 0, c, strlen(c), NULL, 0);
	m_wchar = new wchar_t[len + 1];
	MultiByteToWideChar(CP_ACP, 0, c, strlen(c), m_wchar, len);
	m_wchar[len] = '\0';
	return m_wchar;
}

Utf8 2 Unicode ANSI

WCHAR * Utf8ToUnicode(char* unicode)
{
    int len = MultiByteToWideChar(CP_UTF8, 0, unicode, -1, NULL, 0);
    WCHAR  *szUtf8 = new wchar_t[len + 1];
    memset(szUtf8, 0, len + 1);
    MultiByteToWideChar(CP_UTF8, 0, unicode, -1, szUtf8, len);
    szUtf8[len] = '\0';
    len = len - 1;
    return szUtf8;
}

char * UnicodeToANSI(const wchar_t* str)
{
    char* result;
    int textlen;
    textlen = WideCharToMultiByte(CP_ACP, 0, str, -1, NULL, 0, NULL, NULL);
    result = (char *)malloc((textlen + 1)*sizeof(char));
    memset(result, 0, sizeof(char) * (textlen + 1));
    WideCharToMultiByte(CP_ACP, 0, str, -1, result, textlen, NULL, NULL);
    return result;
}

char* UTF8ToANSI(const char* str)
{
    wchar_t* temp = UTF8ToUnicode(str);
    char* res = UnicodeToANSI(temp);
    delete[]temp;
    return res;
}

CStringHexToInt

int CStringHexToInt(CString str)
{
    int nRet = 0;
    int count = 1;
    for (int i = str.GetLength() - 1; i >= 0; --i)
    {
        int nNum = 0;
        char chTest;
        chTest = str.GetAt(i);
        if (chTest >= '0' && chTest <= '9')
        {
            nNum = chTest - '0';
        }
        else if (chTest >= '?' && chTest <= 'F')
        {
            nNum = chTest - 'A' + 10;
        }
        else if (chTest >= 'a' && chTest <= 'f')
        {
            nNum = chTest - 'a' + 10;
        }
        nRet += nNum*count;
        count *= 16;
    }
    return nRet;
}