Visual C++ - Employee Master File Creation with FILE*
I have given here the source code in Visual C++ for Employee Master File Creation with Flat File System using FILE*.
Source Code
#include <tchar.h>
#include <iostream>
#include <stdlib.h>
class TEmployee
{
public:
char name[64];
int age;
char dept[48];
char addr1[64];
char addr2[64];
char city[48];
char state[48];
char zipcode[12];
};
int ReadRecords(const char *fileName, TEmployee *e, int Sz)
{
FILE *istream = fopen(fileName, "rb");
if (istream == 0)
return false;
char buf[4096];
int nTotalRecordsRead = 0;
for(int i = 0; i < Sz; i++)
{
if(feof(istream))
break;
int nBytesRead = fread(buf, 1, sizeof(TEmployee), istream);
if(nBytesRead < sizeof(TEmployee))
break;
char *p = reinterpret_cast<char*>(&e[i]);
memcpy(p, buf, sizeof(TEmployee));
nTotalRecordsRead++;
}
fclose(istream);
return nTotalRecordsRead;
}
int WriteRecords(const char *fileName, TEmployee *e, int Sz)
{
FILE *ostream = fopen(fileName, "wb");
if (ostream == 0)
return false;
int nTotalRecordsWritten = 0;
char buf[4096];
for(int i = 0; i < Sz; i++)
{
fwrite((char*)&e[i], 1, sizeof(TEmployee), ostream);
nTotalRecordsWritten++;
}
fclose(ostream);
return true;
}
TEmployee wremplList[100];
TEmployee rdemplList[100];
void main()
{
for(int i = 0; i < 10; i++)
{
strcpy(wremplList[i].name, "Kathir");
strcpy(wremplList[i].dept, "CS");
wremplList[i].age = 33;
}
WriteRecords("c:\\kathir\\2.bin", wremplList, 10);
int Sz = ReadRecords("c:\\kathir\\2.bin", rdemplList, 100);
for(int i = 0; i < Sz; i++)
{
std::cout << rdemplList[i].name << "\t";
std::cout << rdemplList[i].age << "\t";
std::cout << rdemplList[i].dept << "\n";
}
}
Output
Kathir CS 33
Kathir CS 33
Kathir CS 33
Kathir CS 33
Kathir CS 33
Kathir CS 33
Kathir CS 33
Kathir CS 33
Kathir CS 33
Kathir CS 33
|
|