c++ gb2312 utf8 转换函数

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这里两个函数实现GB2313与UTF8格式的互转，主要用于VC++在获取网页内容时解决乱码问题，因为VC++默认字符集是GB2312的，一般中文网站可能返回的是UTF-8编码，所以可以用U2G函数进行转换。

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;}

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