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Problems in adding file

Posted on 2011-02-24

C
Algorithms

2 solutions

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Last Modified: 2012-05-11

Hi all,
I was having problem in output the data. I dunno where goes wrong in my code... but i think is in the addFile func or main func! the prog is asked the user to input a filename and that file will add into my database file and then perform sorting and search (there already exist some data in the database with AC1.txt) any help will be greatly appreciated:)

#include	<stdio.h>
#include 	<string.h>
#include 	<stdlib.h>
#include 	"ourhdr.h"

typedef struct				// Country Data struct declaration
    	{  	
		char code[4]; 		// Country Code 
       		char name[50];		// Country Name
		float life_expectancy;	// Life Expentancy of the Country's citizen
		int pop;		// Country's Population
    	} DATATYPE;

typedef struct				// Index Data struct declaration
	{
		char code[4];		
		long int offset;	// offset of the data
	} INDEX;

INDEX StructArray[300];	// for a lot of them
DATATYPE ActualStruct; // for a single struct
DATATYPE DatabaseArray[300]; 	// DATATYPE array

/***********************Index Copy function************************************************/

void indexCopy(INDEX* dest, INDEX src)
{
  strcpy(dest->code, src.code);
  dest->offset = src.offset;
} 

/*************************Insertion Sort function******************************************/

void sort(INDEX SortArray[], int n)
{
	int j;
	for(j=0; j < n;j++)
	{
		int k;
		INDEX temp; //Create a blank index data object
                indexCopy(&temp, SortArray[j]); //copy the data from the current line
		k = j-1;
		while (strcmp(SortArray[k].code, temp.code) >= 0 && k>=0)
		{
			indexCopy(&SortArray[k+1], SortArray[k]); //Now move them over
			k = k - 1;
		}
		indexCopy(&SortArray[k+1], temp);//And move the temp one back in
	}
} 

/*************************Print Sorted Array**********************************************/
void printsort(int size)
{
                      DATATYPE country;

	sort(StructArray,size);	// call sort function
	FILE *FI;
	if((FI = fopen("DATABASE.txt", "r")) == NULL) // open DATABASE for read
    		err_sys("Open DATABASE Fail\n");
	int i;
	printf("--------------------------------------------------------------------------------------------------------\n");
	printf("  CODE \t\t\t COUNTRY NAME \t\t\t   POPULATION      LIFE EXPECTANCY \t OFFSET\n");
	printf("--------------------------------------------------------------------------------------------------------\n");
	
	for (i=0; i<size; i++)
	{	
              	fseek(FI,StructArray[i].offset,SEEK_SET);	//seek the offset in the binary file
               	fread(&country, sizeof(DATATYPE),1,FI);	// read the struct of array from binary file (4 fields)
		printf("%5s%50s%15u%18f%15u\n", country.code, country.name, country.pop, country.life_expectancy, StructArray[i].offset);
	}
} 

/************************Search Function by Country Code*********************************/
void search(int size)
{
	int mid, lower = 0, upper = size, flag = 1;
	INDEX cc;
	FILE *FI;
	if((FI = fopen("DATABASE.txt", "r")) == NULL) // open DATABASE for read
    		err_sys("Open DATABASE Fail\n");
	printf("Enter Country Code to search: ");
	scanf("%s", &cc);

	for(mid = (lower+upper)/2; lower <= upper; mid = (lower + upper)/2)
	{
		if(strcmp(StructArray[mid].code, cc.code) == 0)		// compare the input with the sorted array
		{
			printf("The country code is at position %d in the array at offset %u in the binary file.\n", mid, StructArray[mid].offset);
                        fseek(FI,StructArray[mid].offset,SEEK_CUR);	//seek the offset in the binary file
                        fread(&DatabaseArray[mid], sizeof(DATATYPE),1,FI);	// read the struct of array from binary file (4 fields)
			printf("%s %s %u %f\n", DatabaseArray[mid].code, DatabaseArray[mid].name, DatabaseArray[mid].pop, DatabaseArray[mid].life_expectancy);
			flag = 0;
			break;
		}
		if(strcmp(StructArray[mid].code, cc.code) > 0)		// compare the input with the sorted array
			upper = mid - 1;
		else
			lower = mid + 1;
	}
	
	if (flag)
		printf("Elements not found.");				// print this if the input is not in the array	

	if (fclose(FI))				// close file descriptor FI
		err_sys("Close error\n");
}

/****************************Add File***********************************************/

int addFile(DATATYPE* Array2, char* filename, int startHere)
{
	int i = startHere;	
	int size = startHere;
	char * Tok;         // token from line
	FILE *FI, *FO, *FO2;
	char Line[1000];  // NO input line (delimited by \n) is longer than 1000

	if((FI = fopen(filename, "r")) == NULL) // open a stream from "countries"
    		err_sys("Open Fail\n");

	if((FO = fopen("DATABASE.txt", "a")) == NULL) // open a stream from "countries"
    		err_sys("Open DATABASE Fail\n");

	if((FO2 = fopen("DIRECTORY.txt", "a")) == NULL) // open a stream from "countries"
    		err_sys("Open DIRECTORY Fail\n");

    while ( fgets( (char *) Line,1000,FI) != NULL) // fill buffer up to newline or eof or error
    {

	Tok = strtok( Line ,",\n"); 	// skip ID number

        Tok = strtok( NULL ,",\n"); 	// this should get the country code 
        ActualStruct.code[0] = Tok[0];
        ActualStruct.code[1] = Tok[1];
        ActualStruct.code[2] = Tok[2];
        ActualStruct.code[3] = 0; 	// To create "string" 

	Tok = strtok( NULL ,",\n"); 	// this should get the country name 
        strncpy(&ActualStruct.name[0],Tok,50);	// copy string at most 50 chars

	Tok = strtok( NULL ,",\n"); 	// skip
	Tok = strtok( NULL ,",\n"); 	// skip 
	Tok = strtok( NULL ,",\n"); 	// skip
	Tok = strtok( NULL ,",\n"); 	// skip 

	Tok = strtok( NULL ,",\n"); 	// this should get the population
	ActualStruct.pop = atoi(Tok);	// convert string to integer

        Tok = strtok( NULL ,",\n"); 	// this one should get life expectancy
        ActualStruct.life_expectancy = atof(Tok);	// convert string to a floating point number

	strcpy(Array2[i].code,ActualStruct.code);	// get the current code 
	strcpy(Array2[i].name,ActualStruct.name);	// get the current name
	Array2[i].pop = ActualStruct.pop;		// get the current population
	Array2[i].life_expectancy = ActualStruct.life_expectancy; // get the current life expectancy

	strcpy(StructArray[i].code, ActualStruct.code);	// get the current code 
	StructArray[i].offset = ftell(FO);             	// get the current offset in the DATABASE file 

	if (fwrite(&Array2[i], sizeof(DATATYPE),1,FO) != 1)  // write the struct to the DATABASE file 
		err_sys("fwrite error");

	i++;
	size = i;
	}

/****************************Sort the array and write into DIRECTORY*****************************/

	sort(StructArray,size);	// call sort function
	
	for (i=0; i<size; i++)
	{	
		if (fwrite(&StructArray[i], sizeof(INDEX),1,FO2) != 1)  // write the struct to the DIRECTORY file 
			err_sys("fwrite error");
	}

	if (fclose(FI))				// close file descriptor FI
		err_sys("Close error\n");	
	if (fclose(FO))				// close file descriptor FO
		err_sys("Close error\n");	
	if (fclose(FO2))			// close file descriptor FO2
		err_sys("Close error\n");

}
/****************************************Main Function********************************************/

int main() 
{ 
  	char userfile[50];
  	int count = 0;
	int size = 0;
	count = addFile(DatabaseArray,"AC1.txt",0);

/***********************************read DIRECTORY file into memory******************************/

	FILE *infile;		// declare an index file pointer
	char *buffer;
	long numbytes;

	if((infile = fopen("DIRECTORY.txt", "rb")) == NULL) // open a stream from "countries"
    		err_sys("Open DIRECTORY Fail\n");

	fseek(infile,0,SEEK_END);
	numbytes = ftell(infile);	// get the number of bytes
	
	fseek(infile,0, SEEK_SET);	// reset the file position indicator to the beginning of the file

	buffer = (char*)calloc(numbytes,sizeof(char)); 	// grab sufficient memory for the buffer 
							// to hold the text

	fread(buffer,sizeof(char),numbytes,infile);	// copy all the text into the buffer
	fclose(infile);

	free(buffer);	// free the memory we used for the buffer
	
/*********************************************MENU************************************************/

	int c = -1;
	while( c != 4)
	{
		printf("Please select an option (1 to 4):\n");
		printf("1. Add to the DATABASE\n");
		printf("2. Search the DATABASE\n");
		printf("3. List all the countries in DATABASE by ordered Country Code\n");
		printf("4. Press q to exit\n");
		fflush(stdin);
		c = -1;		// error value if scanf fails
		scanf("%d", &c);
		switch (c)
		{
			case 1:
                                printf("Filename(data that you would like to add in): ");
				scanf("%s",&userfile);
				count = addFile(DatabaseArray, userfile, count);
				break;
			case 2:
				search(size);
				break;
			case 3: 
				printsort(size);
				break;
			case 4:
				puts("Exiting program!");
				return 0;
			default:
				printf("\nNot implemented yet!");
		}
	}
}

Open in new window

the output is nothing

Please select an option (1 to 4):
1. Add to the DATABASE
2. Search the DATABASE
3. List all the countries in DATABASE by ordered Country Code
4. Press 4 to exit
3
--------------------------------------------------------------------------------------------------------
CODE COUNTRY NAME POPULATION LIFE EXPECTANCY OFFSET
--------------------------------------------------------------------------------------------------------

Comment

Question by:crazy4s

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