Re: how to convert byte array into integer

From:

pedagani@gmail.com

Newsgroups:

comp.lang.c++

Date:

20 Jul 2006 14:14:19 -0700

Message-ID:

<1153430059.788545.271820@m73g2000cwd.googlegroups.com>

msosn...@gmail.com wrote:

I have Java client that connects to C++ server. The client sends
integer in binary using DataOutputStream write function. I am reading
these data into buffer. I have to convert this buffer back into
integer, but I am not sure how to do it.
This is my code:

         int32_t var1;
         uint8_t buf[4];

        soc = accept();
         while (true)
        {
                       socket->recv(&buf, 4);
                       var1 = htonl(buf);//here I have to do casting.
        }

My supervisor said that I must use "void *". I tried different
combinations like: (char*)(void *)buf, but everything failed in the
best case, I've been getting some huge numbers (all I was sending was
numerical one)
Any help is appreciated.

Did you try searching for the solution before you posted? From the
overwhelming info you have provided, here is what I've to offer.

unsigned int Byte2Int(char *buff) //module to convert 4 bytes to an
unsigned integer value
{
unsigned char* byte = reinterpret_cast<unsigned char*> (buff);
return ((byte[0]<<24)|(byte[1]<<16)|(byte[2]<<8)|(byte[3]));
}