type casting-Linux vs Unix

I wrote the following program which implements the SORT phase of the external mergesort on the file given as the 2nd argument in the command line :

Code:

#include <iostream>
#include <fstream>
#include <string>
#include <vector>
#include <algorithm>
#include <cmath>

using namespace std;

typedef unsigned char byte;

const int BLOCKSIZE=512;
const int Nb=3;

struct Customer {
    char id[8];
    char fname[13];
    char lname[21];
    char street[13];
    unsigned int postcode;
    unsigned short number;
    char type;
};

struct Code {
    unsigned short int postcode;
    char city[14];
};

class MyCompare {
public:
    int operator()(const Code& c1,const Code& c2) const {
        return c1.postcode<c2.postcode;
    }
};

// Gets the length bytes from Block starting from offset putting them in value

void getField(byte* Block,int length,int offset,void* value) {
    Block+=offset;
    memcpy(value,Block,length);
}

// Sets the length bytes from Block starting from offset into value

void setField(byte *Block,int length,int offset,void *value) {
    Block+=offset;  
    memcpy(Block,value,length);
}

void sortfile(ifstream& infile,int recsize,int field,fstream& outfile) {

    byte* block=new byte[BLOCKSIZE];
    int recnum=BLOCKSIZE/recsize;
    infile.seekg(0,ios::end);
    int blocknum=int(ceil(float(infile.tellg())/float(BLOCKSIZE)));
    infile.seekg(0,ios::beg);
//    int Nr=int(ceil(float(blocknum)/float(Nb)));
    int i=1;
    while(!infile.eof()) {
        vector<Code> code;
        for(int j=1;j<=recnum*Nb;j++) {
            Code tmpcode;
            infile>>tmpcode.postcode>>tmpcode.city;
            if(infile.eof()) break;
            code.push_back(tmpcode);
        }
        sort(code.begin(),code.end(),MyCompare());
        string name(1,char(48+i));name="code"+name;
        fstream run(name.c_str(),ios::binary|ios::out|ios::in|ios::trunc);
        for(int j=0;j<int(ceil(float(code.size())/float(recnum)));j++) {
            for(int k=0;k<recnum && j*recnum+k<code.size();k++) {
                setField(block,2,k*recsize,&code[j*recnum+k].postcode);
                setField(block,14,k*recsize+2,code[j*recnum+k].city);
            }
            run.write(block,BLOCKSIZE);  // *********
            memset(block,0,BLOCKSIZE);
        }
        i++;
    }
    ifstream in1("code1");
    for(int j=0;j<3;j++) {
        in1.read(block,BLOCKSIZE);   // ****************
        for(int i=0;i<32;i++) {
            int postcode;char city[14];
            getField(block,2,i*recsize,&postcode);
            getField(block,14,i*recsize+2,city);
            cout<<postcode<<' '<<city<<endl;   // $$$$$$$$$$$
        }
    }
    ifstream in2("code2");
    in2.read(block,BLOCKSIZE);    // *****************
    for(int i=0;i<2;i++) {
        int postcode;char city[14];
        getField(block,2,i*recsize,&postcode);
        getField(block,14,i*recsize+2,city);
        cout<<postcode<<' '<<city<<endl;   // $$$$$$$$$$
    }

    delete[](block);    
}

int main(int argc,char** argv) {

    if(argc!=4) {
        cout<<"Usage:as1 <customer_file> <code_file> <city>"<<endl;
        exit(1);
    }
    ifstream custfile(argv[1]);
    if(!custfile) {
        cout<<"Could not open file "<<argv[1]<<endl;
        exit(1);
    }
    ifstream codefile(argv[2]);
    if(!codefile) {
        cout<<"Could not open file "<<argv[2]<<endl;
        exit(1);
    }
    string city=argv[3];

    fstream outfile("test21ord",ios::binary|ios::out|ios::in|ios::trunc);
    sortfile(codefile,sizeof(Code),6,outfile);
}

In Linux it runs perfectly.
In Unix(Solaris) it prints 3 compile time errors in the lines with the asterisks.
It's because it needs block to be type casted to char *.
I then compile it putting (char *)block in these 3 lines but when i run it i encounter another problem.
In the lines with the dollars instead of printing the postcode it prints a huge number(maybe the address of postcode in memory,i don't know).The city is printed as it should.I guess because it is a char array.
What has to be changed?
Here is a file to test my prog.Put its name as the 2nd argument.
For the 1st argument just put a valid filename and for the 3rd just put a string.
The file :


157 ATHINA
155 ATHINA
344 LARISA
164 ATHINA
153 ATHINA
345 LARISA
324 TRIKALA
322 KARDITSA
323 TRIKALA
445 HRAKLEIO
435 XANIA
845 BOLOS
241 XANIA
109 AG.NIKOLAOS
199 RODOS
220 KERKYRA
139 THESSALONIKI
963 PATRA
331 PATRA
287 THESSALONIKI
222 XANTHI
444 XANTHI
901 IOANNINA
535 IOANNINA
112 RODOS
800 RODOS
900 AG.NIKOLAOS
400 BOLOS
200 XALKIDA
676 XALKIDA
701 AIGINA
401 SPARTH
131 PYRGOS
210 SPARTH
101 TRIPOLI
450 TRIPOLI
302 KARDITSA
303 KWS
502 KALYMNOS
229 RODOS
228 PATRA
226 IOANNINA
306 KILKIS
307 KILKIS
402 TRIKALA
410 THIVA
419 XALKIDA
503 KILKIS
506 GIANNITSA
808 SKOPELOS
841 SKIATHOS
842 PAROS
998 NAKSOS
922 KORINTHOS
555 KORINTHOS
777 HRAKLEIO
481 HRAKLEIO
311 NAFPLIO
440 NAFPLIO
111 LESBOS
098 SAMOS
012 XIOS
009 SANTORINH
022 ERMOYPOLH
066 LEROS
091 KASOS
077 KARPATHOS
020 KASTELORIZO
062 SKIATHOS
765 KORINTHOS
124 KIATO
345 LEMESOS
456 AMMWXOSTOS
567 AG.KYRIKOS
678 EYDILOS
789 KARLOBASI
891 VATHI
005 LINDOS
033 PATRA
019 ITHAKI
090 KEFALLONIA
050 ZAKINTHOS
911 RODOPI
167 XANIA
898 MESOLOGI
232 MESOLOGI
676 AITWLIKO
430 KARPENHSI
987 KASTORIA
876 KASSANDRA
765 RETHIMNO
654 RETHIMNO
543 PITHAGOREIO
432 MARATHOKAMPOS
321 ATHINA
109 RETHIMNO
666 DILESI
176 THIVA

Thanks salem.It worked.