Sorry but I'm having a problem whit this function that is meant to let me edit records in a binary file. After I enter what I want to change an attribute to the file remains unchanged.
void updateStudent(fstream & file)
{
S students;
long lenth;
char snum[10];
char editChoice = '7';
bool editmade = 0;
lenth = sizeof(S);
int list = 1;
int recno = 0;
file.open(FILENAME, ios::in|ios::out|ios::binary);
if(!file)
{
cout<<"can not open file"<<endl;
}
//file.clear(); //refresh file variable
file.seekg (0,ios:: beg);
file.read( reinterpret_cast< char *> (&students),sizeof(S));
while(!file.eof())
{
cout<<"Enter "<<list<<" to edit \t"<<students.regNumber<<endl;
file.read( reinterpret_cast< char *> (&students),sizeof(S));
list++;
}
list--;
cout << "Enter number 1 to "<<list<<" of student to be found:"<<endl;
cin.getline(snum, 10);
//cin.ignore();
file.clear(); //refresh file variable
file.seekg(0, ios::beg);
//file.read( reinterpret_cast< char *> (&students),sizeof(S));
while(!(file.eof()) && editChoice!='Q')
{
if (strcmp(snum, students.regNumber) != 1)
{
do {
updateMenu (editChoice);
///////////////////////////////////////////////////////////////////////////////////////////
switch(editChoice)
{
cout<<editChoice;
case '1':{
cout<<"Editing student number"<<endl;
cout<<"Enter the registration number."<<endl;
//cin>>students.regNumber;
cin.getline(students.regNumber, 10);
//client.accountNumber - 1 ) * // position
//sizeof( clientData )
int pos = file.tellg();
int offset = pos-10;
file.seekp( offset, ios::beg );
file.write( reinterpret_cast< char *> (&students),sizeof(S));
editChoice = '0';
editmade = 1;
break;
}
case '2':{
cout<<"edit student name"<<endl;
break;
}
case '3':{
cout<<"To edit date registered"<<endl;
break;
}
case '4':{
cout<<"edit modules"<<endl;
break;
}
case 'Q':{
cout<<"About to Quit"<<endl;
file.eof();
break;
}
default: {
cout<<"Enter A,B,C,D,E or Q"<<endl;
break;
}
}
} while( editChoice!='Q');
}
else{
cout<<"not a student"<<endl;
}
file.close();
}
}Sorry about the messy code.
Thanks.
