// package
char buffer[260];
char data[256] = {0x68,0x04,0x43,0x00,0x00,0x00};
int len = 6;
memcpy(buffer, &len, sizeof(len));
memcpy(buffer + sizeof(len), data, len);

// depackage
// char buffer[260];
char data[256] = {0};
int len;
memcpy(&len, buffer, sizeof(len));
memcpy(data, buffer + sizeof(len), len);

for (int i=0;i < len;i++) 
{ 
cout << int(data[i]) << endl;; 
}

#include<iostream>
#include<string>
#include<cctype>
#include<fstream>

using namespace std;

int main()
{
char data[256] = {0x68,0x04,0x43,0x00,0x00,0x00}; //用strlen取出非零字符以前的。
    for (int i=0;i<strlen(data);i++) 
    { 
    cout<<int(data[i])<<endl;; 
    }
}

#include<iostream>
#include<string>
#include<cctype>
#include<fstream>

using namespace std;

int main()
{
char data[] = {0x68,0x04,0x43,0x00,0x00,0x00}; //用data[]声明，后面用SIZEOF
    for (int i=0;i<sizeof(data);i++) 
    { 
    cout<<int(data[i])<<endl;; 
    }
}