Fopen failed for data file: errno = 2 (no such file or directory)

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fopen failed for data file: errno = 2 (no such file or directory)

This error message indicates that the fopen function in a program was unable to open a file because the specified file does not exist in the given directory path. The error code errno = 2 specifically refers to a “No such file or directory” error.

To understand this error better, let’s consider an example. Suppose we have a program named example.c which attempts to open a file named data.txt in the current directory using fopen function: 


#include <stdio.h>

int main() {
  FILE *filePtr = fopen("data.txt", "r");
  if (filePtr == NULL) {
    printf("fopen failed for data file: errno = %d (no such file or directory)\n", errno);
    return 1;
  }
  
  // File operations
  
  fclose(filePtr);
  return 0;
}

In this example, we try to open the file data.txt for reading with the mode "r". If the file does not exist in the current directory, the fopen function will return a NULL pointer, indicating a failure.

To handle this error, we can check if the file pointer is NULL, and if so, print an error message along with the corresponding errno value. In this case, the error message will be: "fopen failed for data file: errno = 2 (no such file or directory)".

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