以16进制打印出一块内存buff

void PrintBuffer(void* pBuff, unsigned int nLen)
{
    if (NULL == pBuff || 0 == nLen)
    {
        return;
    }

    const int nBytePerLine = 16;
    unsigned char* p = (unsigned char*)pBuff;
    char szHex[3*nBytePerLine+1] = {0};

    printf("-----------------begin-------------------\n");
    for (unsigned int i=0; i<nLen; ++i)
    {
        int idx = 3 * (i % nBytePerLine);
        if (0 == idx)
        {
            memset(szHex, 0, sizeof(szHex));
        }
#ifdef WIN32
        sprintf_s(&szHex[idx], 4, "%02x ", p[i]);// buff长度要多传入1个字节
#else
        snprintf(&szHex[idx], 4, "%02x ", p[i]); // buff长度要多传入1个字节
#endif
        
        // 以16个字节为一行，进行打印
        if (0 == ((i+1) % nBytePerLine))
        {
            printf("%s\n", szHex);
        }
    }

    // 打印最后一行未满16个字节的内容
    if (0 != (nLen % nBytePerLine))
    {
        printf("%s\n", szHex);
    }

    printf("------------------end-------------------\n");
}