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#1 ShankarLall ?
Reputation: 0
- Posts: 5
- Joined: 15-April 13
Posted Today, 12:01 PM
I am trying to write a file using function but not working. I am getting a few warning message.below is my code.
Please let me know what and how i can get this to work.
#include <stdio.h> #include <stdlib.h> #include <time.h> struct employeeStr { int empID; char fName[50]; char lName [50]; int dob; int hireDate; char sex[10]; }; void addNewEmployee(FILE *fPtr); void openFile(char fileName [], FILE *fptr); void closeFile(FILE *fptr); int main () { char employeeFile [50]= "employee.dat"; FILE *employeeFliePtr; //Open Employee File openFile(employeeFile, &employeeFliePtr); //Add New Employee addNewEmployee(&employeeFliePtr); //Close Employee File closeFile(&employeeFliePtr); printf("\t\tThank You...\n\t\tGood Bye!!!\n\n"); return 0; } void openFile(char fileName[], FILE *fptr) { if ( ( fptr = fopen( fileName, "ab+" ) ) == NULL ) printf( "File could not be opened\n" ); } void closeFile(FILE *fptr) { fclose (fptr); } void addNewEmployee(FILE *fPtr) { struct employeeStr data = {0, "", "", 0, "", 0}; int id; printf("Enter Employee ID (1000-9999): "); scanf("%d", &id); fseek( fPtr, ( id - 1 ) * sizeof( struct employeeStr ), SEEK_SET ); fread( &data, sizeof( struct employeeStr ), 1, fPtr ); if (data.empID != 0) { printf("This is a Duplicated Employee ID"); } else { data.empID = id; printf("Enter Employee First Name: "); fscanf(stdin,"%s", &data.fName); printf("Enter Employee Last Name: "); fscanf(stdin,"%s", &data.lName); printf("Enter Date of Birth (YYYYMMDD): "); fscanf(stdin,"%u", &data.dob); printf("Enter Employee Gender (M/F): "); fscanf(stdin,"%s", &data.sex); printf("Enter Employee Start Date (YYYYMMDD): "); fscanf(stdin,"%u", &data.hireDate); fseek(fPtr, (data.empID -1) *sizeof (struct employeeStr), SEEK_SET); fwrite (&data, sizeof (struct employeeStr), 1, fPtr ); } }
Is This A Good Question/Topic? 0
Replies To: Writing C Files using Function
#2 modi123_1 ?
Reputation: 6236
- Posts: 22,585
- Joined: 12-June 08
Re: Writing C Files using Function
Posted Today, 12:07 PM
It is always helpful to know what the error messages are, and what line they are on.
#3 David W ?
Reputation: 243
- Posts: 1,600
- Joined: 20-September 08
Re: Writing C Files using Function
Posted Today, 12:14 PM
ShankarLall, on 20 April 2013 - 03:01 PM, said:
below is my code.
Please let me know what and how i can get this to work.
#include <stdio.h> #include <stdlib.h> #include <time.h> struct employeeStr { int empID; char fName[50]; char lName [50]; int dob; int hireDate; char sex[10]; }; void addNewEmployee(FILE *fPtr); void openFile(char fileName [], FILE *fptr); void closeFile(FILE *fptr); int main () { char employeeFile [50]= "employee.dat"; FILE *employeeFliePtr; //Open Employee File openFile(employeeFile, &employeeFliePtr); //Add New Employee addNewEmployee(&employeeFliePtr); //Close Employee File closeFile(&employeeFliePtr); printf("\t\tThank You...\n\t\tGood Bye!!!\n\n"); return 0; } void openFile(char fileName[], FILE *fptr) { if ( ( fptr = fopen( fileName, "ab+" ) ) == NULL ) printf( "File could not be opened\n" ); } void closeFile(FILE *fptr) { fclose (fptr); } void addNewEmployee(FILE *fPtr) { struct employeeStr data = {0, "", "", 0, "", 0}; int id; printf("Enter Employee ID (1000-9999): "); scanf("%d", &id); fseek( fPtr, ( id - 1 ) * sizeof( struct employeeStr ), SEEK_SET ); fread( &data, sizeof( struct employeeStr ), 1, fPtr ); if (data.empID != 0) { printf("This is a Duplicated Employee ID"); } else { data.empID = id; printf("Enter Employee First Name: "); fscanf(stdin,"%s", &data.fName); printf("Enter Employee Last Name: "); fscanf(stdin,"%s", &data.lName); printf("Enter Date of Birth (YYYYMMDD): "); fscanf(stdin,"%u", &data.dob); printf("Enter Employee Gender (M/F): "); fscanf(stdin,"%s", &data.sex); printf("Enter Employee Start Date (YYYYMMDD): "); fscanf(stdin,"%u", &data.hireDate); fseek(fPtr, (data.empID -1) *sizeof (struct employeeStr), SEEK_SET); fwrite (&data, sizeof (struct employeeStr), 1, fPtr ); } }
First off ...
Note:
openFile(employeeFile, &employeeFilePtr); /* you are taking an address of a pointer */
So ...
void openFile(char fileName [], FILE** fptr); /* matches ... etc where ever applicable*/
But perhaps your code could all be refactored ...
so that all you need to pass is ...
openFile(employeeFile);
/* then use */
void openFile(char fileName []);
Or ... if you really want/need to pass in the file name AND the file pointer ...
so that the file pointer in the calling scope is updated ...
typedef struct { char* fname; FILE* fptr; } NamePtr ;
Then ...
passing in the address of the struct
and updating the members inside your function
can keep the calling syntax simpler
This post has been edited by David W: Today, 12:37 PM
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Source: http://www.dreamincode.net/forums/topic/319082-writing-c-files-using-function/
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