Why is the file not opening using fopen? - c

Question

I have tried several methods but none of them have worked.
I copied the txt file into the root file and it didn't open too. I have also tried to use the full path of the txt file. The same thing happened when I tried to use another IDE on another laptop.
Also the compiler isn't giving me any error.
Here is my code:
int main()
{
struct TreeNode *tmpDicNode;
struct LinkedList *tmpLinkedList;
FILE *infile;
infile = fopen("..//Synonyms.txt" ,"r");
char line[500];
while(fgets(line, 500, infile))
{
//if ( strlen(line)>0){
line[strlen(line) - 2] = '\0';
char * token = strtok(line, " -\n");
tmpDicNode = newTreeNode(token);
tmpLinkedList = newLinkedList();
while(token != NULL )
{
token = strtok(NULL, " , -\n");
if (token != NULL)
{
insertSynonym(tmpLinkedList, token);
}
}
tmpDicNode->synonyms = tmpLinkedList;
Root = insertWord(Root, tmpDicNode);
}
fclose(infile);
int ch = 0;
char userWord[30];
char userWord2[30];
while(ch!=8)
{
printf("\n=====================================\n");
printf("1. View The Dictionary.\n");
printf("2. test word existence.\n3. print synonyms of a word.\n");
printf("4. add a synonym to a word.\n5. get the biggest word with synonyms.\n");
printf("6. get all words of a synonym.\n");
printf("7. Save the dictionary to dict.txt file.\n");
printf("8. Exit.\n");
printf("=====================================\n");
printf("\nEnter Your Choice: ");
scanf("%d",&ch);
switch (ch)
{
case 1:
viewDictionary(Root);
break;
case 2:
printf("Enter word: ");
scanf("%s", userWord);
if (findWordNode(userWord)) printf("%s is present in the dict \n", userWord);
else printf("%s isn't found! \n", userWord);
break;
case 3:
printf("Enter word: ");
scanf("%s", userWord);
printLinkedlist(findWordNode(userWord)->synonyms);
break;
case 4:
printf("Enter word: ");
scanf("%s", userWord);
printf("Enter synonym: ");
scanf("%s", userWord2);
AddToWordSynonyms(userWord, userWord2);
break;
case 5:
printf("The word with the height no. of Synonyms is: %s", getMaxSynsWord(Root)->word);
break;
case 6:
printf("Enter a synonym: ");
scanf("%s", userWord);
getSyncWords(Root, userWord);
break;
case 7:
saveTheDictToFile(Root);
printf("The dictionary saved to others/dict.txt, Go and check it!\nGoodbye..!\n");
ch = 8;
break;
case 8:
printf("Goodbye..!\n");
break;
default:
printf("Please Enter a valid option number from 1 to 7\n");
}
}
return 0;
}

Answer 1

Let's address a couple of the issues here:
synonyms.txt
cold: cool,frigid,freezing
good: acceptable,virtuous
readsyn.c
/*
* readsyn.c
*
* SAMPLE OUTPUT:
* Current directory: C:\Users\paulsm\workspace-cdt\readsyn\Debug
* Opening file (..\synonyms.txt)
* Reading file (..\synonyms.txt)
* line=cold: cool,frigid,freezing
* ...
* Currently 4 words
* line=good: acceptable,virtuous...
* Currently 7 words
* Done: found 2 lines
* synonyms[0]:cold synonyms[1]:cool synonyms[2]:frigid synonyms[3]:freezing synonyms[4]:good synonyms[5]:acceptable synonyms[6]:virtuous
*/
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#define MAXWORDS 10
#define MAXLINE 80
#define TOKENS ":,"
#define FNAME "..\\synonyms.txt"
int main(int argc, char *argv[])
{
char synonyms[MAXWORDS][MAXLINE] = {0};
char current_folder[MAXLINE];
char line[MAXLINE], *token;
FILE *infile;
int nlines = 0, iword=0;
printf ("Current directory: %s\n", getcwd(current_folder, MAXLINE));
printf ("Opening file (%s)\n", FNAME);
if (!(infile = fopen(FNAME,"r"))) {
perror("File open failed");
return 1;
}
printf ("Reading file (%s)\n", FNAME);
while((fgets(line, MAXLINE, infile) != NULL) && (iword < MAXWORDS))
{
printf("line=%s...\n", line);
if (line[strlen(line)-1] == '\n')
line[strlen(line)-1] = 0;
token = strtok(line, TOKENS);
while (token != NULL) {
strncpy (synonyms[iword], token, MAXLINE);
token = strtok(NULL, TOKENS);
iword++;
}
printf("Currently %d words\n", iword);
nlines++;
}
fclose(infile);
printf ("Done: found %d lines\n", nlines);
for (int i=0; i < iword; i++)
printf ("synonyms[%d]:%s ", i, synonyms[i]);
return 0;
}
Main points:
ALWAYS check if an I/O operation like "fopen()" succeeded or failed.
You can use APIs like getcwd() (among others) to get your current working directory.
If — as in your example — you don't give an absolute path (like "C:\\temp\\f.txt" on Windows, or "/tmp/f.txt" on *nix) for your filename, then the path argument is interpreted relative to that current working directory of the application. In Visual Studio that is by default somewhere buried in the Debug directory of your project; in Linux it would be the current directory of your shell.