test.cpp

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#include <iostream>
#include <vector>
#include <stdio.h>
#include <string.h>

using namespace std;

int main()
{
    vector<unsigned char> buffer;
    buffer.push_back(1);
    buffer.push_back(0);
    buffer.push_back(1);
    buffer.push_back(0);
    
    int length = (((buffer[0] << 8 | buffer[1]) << 8 | buffer[2]) << 8 | buffer[3]) ;

    
    cout<<"length = " << length;

    return 0;
}