Problem opening file

[telmo_d]

It gives me error message that i used. Its first time i use const char *file, what is wrong? I have file in same folder as program.

int readStudentsFile(const char *file, Student Table[], int N)
{
	int i;
	Student newStudent;
	FILE *f;
	f = fopen(file, "r");
	if(f == NULL)
	{
		return -1; // error
	}
	while(!feof(f))
	{
		fscanf(f, "%d\n", &newStudent.num);
}
fclose(f);
return 1;

int main()
{
	int k, Size=50, num, pos, fileIsOkay;
	char file[20];
	Student *newStudent;
        HASH *HashTable;


	
	
	
	printf("Read file? (0 = no, 1 = yes) ");
	scanf("%d", &k);
	if(k==1)
	{
		fileIsOkay = readStudentsFile("data.txt", HashTable, Size);
		if(fileIsOkay == -1)
		{
			printf("Error opening file \n");
		}
	}

[vart]

If you'd use the autoformating - you'd see the missing brackets

int readStudentsFile(const char *file, Student Table[], int N)
{
    int i;
    Student newStudent;
    FILE *f;
    f = fopen(file, "r");
    if(f == NULL)
    {
        return -1; // error
    }
    while(!feof(f))
    {
        fscanf(f, "%d\n", &newStudent.num);
    }
    fclose(f);
    return 1;

    int main()
    {
        int k, Size=50, num, pos, fileIsOkay;
        char file[20];
        Student *newStudent;
        HASH *HashTable;





        printf("Read file? (0 = no, 1 = yes) ");
        scanf("%d", &k);
        if(k==1)
        {
            fileIsOkay = readStudentsFile("data.txt", HashTable, Size);
            if(fileIsOkay == -1)
            {
                printf("Error opening file \n");
            }
        }

As a side note FAQ > Why it's bad to use feof() to control a loop - Cprogramming.com

[telmo_d]

Hate when i do that. That was error from translating the code. Is the code technically correct, like of you are going to use const char *file in parameter of function you pass file like that? And then if you it on the folder it should open with no problem, right? For some reason it's not working.

EDIT: ok so i just tested with my usual process of specicying the directory inside the function and it still doesn't work. Always worked for me. What can be going on here? I can only see it as a permission thing or something but i never had problem in this directory.

[jimblumberg]

If you're having problems opening the file then instead of using printf() to print the error message try perror() instead, but do it where the failure occurred not in the calling function.

Also depending on how you're running the program the working directory where the file should be located may be different.

ok so i just tested with my usual process of specicying the directory inside the function and it still doesn't work.

Since I have no idea what your "usual process" is this really means nothing. Show the code showing what you've tried.

Jim

[telmo_d]

Yeah you're right should have provided some code. Anyways i tried what you suggested above, using perror where the error occurs. It gives me "No such file or directory"

[telmo_d]

Ok dumb mistake. Was using .txt in the filename in the directory and obviously was having troubles locating it since it was looking for data.txt and and not data.txt.txt

[jimblumberg]

Looks like you need to turn of that hide known extensions "feature" in your editor/explorer so it isn't so helpful. You'll have to find and read the documentation for the tools you're using to see how to turn of that "feature", or perhaps someone that does Windows might be able to tell you how.

Jim