CODEWITHSUNDEEP
cvariablestext-filesfilepathfopen
Mateo Spajić
Mateo Spajić

Reputation: 5

File name variable in file path in C

So I am writing a program that uses text files. I have a line of code that goes like this.

pfw = fopen(fileName, "w");

I am trying to make that program to create a txt file in this relative path

./TextFiles/

I have no idea how to implement a fileName variable in the file path. I usually do it like this when I have static fileName and program doesn't ask me to give it a file name or where fileName is not a variable and it works.

pfw = fopen("./TextFiles/fileName.txt", "w");

Upvotes: 0

Views: 1054

Answers (1)

जलजनक
जलजनक

Reputation: 3071

  • #define the relative path if configuration files are not being used
#define BASE_DIR "./TextFiles/"

char* finalName = malloc (strlen(BASE_DIR) + strlen(fileName) + 1);
if (!finalName) { /* error handling */ }

sprintf (finalName, "%s%s", BASE_DIR, fileName);

FILE* pfw = fopen(finalName, "w");
/*
...
*/
// free after usage
free (finalName);

Upvotes: 1

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