Thread: Writing to a Binary File

Ok this thread is related to the other thread posted by someone else on this message board in regards to a C program. So dude if you've got any troubles u might be able to find some answers in my program. Anyhow with this program it needs to be able to
1.Modify patient record
2.Show patient record
3.Process Job
q.Quit from the system

So far i can show patient record and quit the system. What i cant do it modify patient record and once i can do that i can proceed to the process job section of the program.
What i need is someone to show me how to modify the name and address of a particular patient. This will be carried out in the ModifyPatient() function.

Here is my code so far, obviously some of it is absolutely useless and doesnt work. But most of it works and compiles.

Code:

#include <stdio.h>
#include <time.h>

typedef struct
{
	char fName[21];
	char gName[21];
} name_struct;

typedef struct
{
	char street[21];
	char suburb[16];
	char state[4];
	int postcode;
} address_struct;

typedef struct
{
	char id[5];
	name_struct name;
	address_struct address;
	double balance ;
	char lastUpdate[11];
} patient_struct;

/*typedef struct
{
	int jobCode;
	char description[21];
	double fee;
}fee_struct;*/

void showMenu();
void modifyPatient();
void showPatient();
void processFile();
void getDate(char *);
//void FeeSchedule(fee_struct fee[30]);
void displayPatient(patient_struct);
void getPatient(patient_struct patient);
void modifyfName();
void modifygName();
void modifyStreet();
void modifySuburb();
void modifyState();
void modifyPostCode();

char today[11];



main()
{
	//fee_struct feeSchedule[30];
	char option ='0';
	getDate(today);
	//getFeeSchedule(feeSchedule);
	while(option!='q'||option!='Q')
	{
		showMenu();
		option=getchar();getchar();
		switch(option)
		{
			case '1':modifyPatient();
					 break;
			case '2':showPatient();
					 break;
			case '3':processFile();
					 break;
			case 'q':
			case 'Q':exit(0);
		}
	}
}

void getDate(char *today)
{
	time_t x;
	struct tm *t;
	time(&x);

	t = localtime(&x);

	sprintf(today,"%d/%d/%d\n", t->tm_mday, t->tm_mon + 1, t->tm_year + 1900);
	puts(today);
}

/*void FeeSchedule(fee_struct fee[30])
{
	//Here you
	//1.open the text file
	//2.read the records and put them in the array (week8-9)
}*/

void showMenu()
{
	printf("\n\n");
	printf("Dr Stevenson Dental Surgery\n");
	printf("Patient System\n\n");
	printf("1. Modify patient record\n");
	printf("2. Show patient record\n");
	printf("3. Process work file\n");
	printf("q. Quit the system\n");
	printf(" Choose 1,2,3 or q: ");
}

void modifyPatient()
{
	FILE *file;
	int i;
	char option ='0';
	char patientId[5];
	patient_struct patient;
	printf("Enter patient id: ");
	gets(patientId);
	file=fopen("patient.dat","rb");
	fread(&patient, sizeof(patient), 1,file);
	while(!feof(file))
	{
	if (strcmp(patientId,patient.id)==0)
	while(option!='q'||option!='Q')
	{
	getPatient(patient);
	option=getchar();getchar();
	switch(option)
		{
			case '1':modifyfName();
					 break;
			case '2':modifygName();
					 break;
			case '3':modifyStreet();
					 break;
			case '4':modifySuburb();
					 break;
			case '5':modifyState();
					 break;
			case '6':modifyPostCode();
			case 'q':
			case 'Q': exit(0);
		}
	}
	fread(&patient, sizeof(patient), 1,file);
}//end of file
	fclose(file);
}

void modifyfName()
{
//printf("not yet done\n");
FILE *file;
patient_struct patient;
file=fopen("patient.dat","ab");
fwrite(&patient,sizeof(patient_struct),1,file);
printf("Enter new family name: ");
gets(patient.name.gName);
}

void modifygName()
{
printf("not yet done\n");
}

void modifyStreet()
{
printf("not yet done\n");
}

void modifySuburb()
{
printf("not yet done\n");
}

void modifyState()
{
printf("not yet done\n");
}

void modifyPostCode()
{
printf("not yet done\n");
}

void getPatient(patient_struct patient)
{
	printf("\n");
	printf("  Patient id     	: %s \n", patient.id);
	printf("1.Family name	 	: %s \n", patient.name.gName);
	printf("2.Given name	 	: %s \n", patient.name.fName);
	printf("3.Street & Number	: %s \n", patient.address.street);
	printf("4.Suburb		: %s \n", patient.address.suburb);
	printf("5.State			: %s \n", patient.address.state);
	printf("6.Postcode		: %d \n", patient.address.postcode);
	printf("  Balance		: %.2lf\n", patient.balance);
	printf("  Last update		: %s\n", patient.lastUpdate);
	printf("q.Go back to menu\n");
}

void showPatient()
{
	//get patient id
	FILE *file;
	char patientId[5];
	patient_struct patient;
	printf("Enter patient id: ");
	gets(patientId);
	file=fopen("patient.dat","rb");
	fread(&patient,sizeof(patient_struct),1,file);
	while(!feof(file))
	{
	if(strcmp(patientId,patient.id)==0)
	{
		displayPatient(patient);
		break;
	}
	fread(&patient,sizeof(patient_struct),1,file);
}//end of file
fclose(file);
}

void processFile()
{
	printf("not yet done\n");
}

void displayPatient(patient_struct patient)
{
	printf("\n");
	printf("Patient id     : %s \n", patient.id);
	printf("Patient name   : %s %s \n", patient.name.gName, patient.name.fName);
	printf("Patient address: %s \n", patient.address.street);
	printf("                 %s %s %d\n", patient.address.suburb,
	         patient.address.state, patient.address.postcode);
	printf("Balance        : %.2lf \n", patient.balance);
	printf("Last update    : %s\n", patient.lastUpdate);
}

The link to the binary file:
http://www.uow.edu.au/~yang/buss111/files/patient.dat