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Error handling ways updated

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This commit is contained in:
kivancgnlp 2025-12-12 08:42:50 +03:00
parent aef794d020
commit 55c6d574f6
4 changed files with 58 additions and 74 deletions
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47
exercises/24_file_io/file_io2.rs
View File

@ -7,26 +7,22 @@ const TEST_OUTPUT_FILE_NAME: &str = "MultiLineOutputFile.txt";
fn main() { fn main() {
create_required_files(); create_required_files();
let input_file = fs::File::open(TEST_INPUT_FILE_NAME);
if input_file.is_err() { let input_file = match fs::File::open(TEST_INPUT_FILE_NAME) {
panic!("Input file open error"); Ok(f) => f,
} Err(e) => panic!("Input file open error : {}", e),
};
let buffered_input_file = BufReader::new(input_file);
let output_file = match fs::File::create(TEST_OUTPUT_FILE_NAME){
Ok(f) => f,
Err(e) => panic!("Output file open error : {}", e),
};
// TODO : How to create a new BufReader using input file // TODO : How to create a new BufReader using input file
let buffered_input_file =; let buffered_input_file =;
let output_file = fs::File::create(TEST_OUTPUT_FILE_NAME);
if output_file.is_err() {
eprintln!(
"Output file open error : {}",
output_file.as_ref().unwrap_err()
);
panic!("Output file open error");
}
let mut buffered_file_writer = BufWriter::new(output_file.ok().unwrap());
let mut line_number = 1; let mut line_number = 1;
for line in buffered_input_file.lines() { for line in buffered_input_file.lines() {
@ -58,17 +54,14 @@ fn create_required_files() {
if file_write_result.is_ok() { if file_write_result.is_ok() {
println!("Multi line file created successfully!"); println!("Multi line file created successfully!");
} else { }else {
eprintln!( eprintln!("Error creating file : {} , error : {:?}", file_path.display(), file_write_result.err());
"Error creating file : {} , error : {:?}",
file_path.display(),
file_write_result.err()
);
} }
} }
} }
fn file_cleanup() { fn file_cleanup() {
let file_names = vec![TEST_INPUT_FILE_NAME, TEST_OUTPUT_FILE_NAME]; let file_names = vec![TEST_INPUT_FILE_NAME, TEST_OUTPUT_FILE_NAME];
for file_name in file_names { for file_name in file_names {
@ -78,15 +71,13 @@ fn file_cleanup() {
let remove_status = fs::remove_file(file_path); let remove_status = fs::remove_file(file_path);
if remove_status.is_ok() { if remove_status.is_ok() {
println!("Successfully deleted file {}", file_name); println!("Successfully deleted file {}", file_name);
} else { }else {
eprintln!( eprintln!("Error deleting file {}, err : {:?}", file_name, remove_status.err());
"Error deleting file {}, err : {:?}",
file_name,
remove_status.err()
);
} }
} else { }else {
println!("No cleanup necassary since {} not exist.", file_name); println!("No cleanup necassary since {} not exist.", file_name);
} }
} }
} }

25
exercises/24_file_io/file_io3.rs
View File

@ -11,19 +11,20 @@ fn main() {
// TODO : How to get metadata using path_buffer ? // TODO : How to get metadata using path_buffer ?
let meta_data_result = path_buffer. let meta_data_result = path_buffer.
if let Ok(meta_data) = meta_data_result { match meta_data_result {
Ok(meta_data) => {
println!("Metadata about the file : {:?}", path_buffer); println!("Metadata about the file : {:?}", path_buffer);
println!("File creation time {:?}", meta_data.created()); println!("File creation time {:?}", meta_data.created());
println!("File size {}", meta_data.len()); println!("File size {}", meta_data.len());
assert_eq!(meta_data.len(), 117); assert_eq!(meta_data.len(), 117);
println!("File permissions {:?}", meta_data.permissions()); println!("File permissions {:?}", meta_data.permissions());
assert!(!meta_data.permissions().readonly()); assert!(!meta_data.permissions().readonly());
} else {
eprintln!(
"Could not get metadata. Error: {:?}",
meta_data_result.err()
);
} }
Err(error) => {
eprintln!("Could not get metadata. Error: {:?}", error);
}
}
file_cleanup(); file_cleanup();
} }
@ -48,12 +49,8 @@ fn create_required_files() {
if file_write_result.is_ok() { if file_write_result.is_ok() {
println!("Multi line file created successfully!"); println!("Multi line file created successfully!");
} else { }else {
eprintln!( eprintln!("Error creating file : {} , error : {:?}", file_path.display(), file_write_result.err());
"Error creating file : {} , error : {:?}",
file_path.display(),
file_write_result.err()
);
} }
} }
} }
@ -68,7 +65,7 @@ fn file_cleanup() {
let remove_status = fs::remove_file(&path_buffer); let remove_status = fs::remove_file(&path_buffer);
if remove_status.is_ok() { if remove_status.is_ok() {
println!("Test file deleted."); println!("Test file deleted.");
} else { }else {
panic!("Error deleting file."); panic!("Error deleting file.");
} }
} }
@ -79,7 +76,7 @@ fn file_cleanup() {
let remove_status = fs::remove_dir(&path_buffer); let remove_status = fs::remove_dir(&path_buffer);
if remove_status.is_ok() { if remove_status.is_ok() {
println!("Test directory deleted."); println!("Test directory deleted.");
} else { }else {
panic!("Error deleting directory."); panic!("Error deleting directory.");
} }
} }

24
solutions/24_file_io/file_io2.rs
View File

@ -7,24 +7,20 @@ const TEST_OUTPUT_FILE_NAME: &str = "MultiLineOutputFile.txt";
fn main() { fn main() {
create_required_files(); create_required_files();
let input_file = fs::File::open(TEST_INPUT_FILE_NAME);
if input_file.is_err() { let input_file = match fs::File::open(TEST_INPUT_FILE_NAME) {
panic!("Input file open error"); Ok(f) => f,
} Err(e) => panic!("Input file open error : {}", e),
};
let buffered_input_file = BufReader::new(input_file.unwrap()); let buffered_input_file = BufReader::new(input_file);
let output_file = fs::File::create(TEST_OUTPUT_FILE_NAME); let output_file = match fs::File::create(TEST_OUTPUT_FILE_NAME) {
Ok(f) => f,
Err(e) => panic!("Output file open error : {}", e),
};
if output_file.is_err() { let mut buffered_file_writer = BufWriter::new(output_file);
eprintln!(
"Output file open error : {}",
output_file.as_ref().unwrap_err()
);
panic!("Output file open error");
}
let mut buffered_file_writer = BufWriter::new(output_file.ok().unwrap());
let mut line_number = 1; let mut line_number = 1;

12
solutions/24_file_io/file_io3.rs
View File

@ -10,18 +10,18 @@ fn main() {
let meta_data_result = path_buffer.metadata(); let meta_data_result = path_buffer.metadata();
if let Ok(meta_data) = meta_data_result { match meta_data_result {
Ok(meta_data) => {
println!("Metadata about the file : {:?}", path_buffer); println!("Metadata about the file : {:?}", path_buffer);
println!("File creation time {:?}", meta_data.created()); println!("File creation time {:?}", meta_data.created());
println!("File size {}", meta_data.len()); println!("File size {}", meta_data.len());
assert_eq!(meta_data.len(), 117); assert_eq!(meta_data.len(), 117);
println!("File permissions {:?}", meta_data.permissions()); println!("File permissions {:?}", meta_data.permissions());
assert!(!meta_data.permissions().readonly()); assert!(!meta_data.permissions().readonly());
} else { }
eprintln!( Err(error) => {
"Could not get metadata. Error: {:?}", eprintln!("Could not get metadata. Error: {:?}", error);
meta_data_result.err() }
);
} }
file_cleanup(); file_cleanup();