Package ioutil
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Variables
Discard is an io.Writer on which all Write calls succeed without doing anything.
Deprecated: As of Go 1.16, this value is simply io.Discard.
var Discard io.Writer = io.Discard
func NopCloser ¶
func NopCloser(r io.Reader) io.ReadCloser
NopCloser returns a ReadCloser with a no-op Close method wrapping the provided Reader r.
Deprecated: As of Go 1.16, this function simply calls io.NopCloser.
func ReadAll ¶
func ReadAll(r io.Reader) ([]byte, error)
ReadAll reads from r until an error or EOF and returns the data it read. A successful call returns err == nil, not err == EOF. Because ReadAll is defined to read from src until EOF, it does not treat an EOF from Read as an error to be reported.
Deprecated: As of Go 1.16, this function simply calls io.ReadAll.
▸ Example
func ReadDir ¶
func ReadDir(dirname string) ([]fs.FileInfo, error)
ReadDir reads the directory named by dirname and returns a list of fs.FileInfo for the directory's contents, sorted by filename. If an error occurs reading the directory, ReadDir returns no directory entries along with the error.
Deprecated: As of Go 1.16, os.ReadDir is a more efficient and correct choice: it returns a list of fs.DirEntry instead of fs.FileInfo, and it returns partial results in the case of an error midway through reading a directory.
If you must continue obtaining a list of fs.FileInfo, you still can:
entries, err := os.ReadDir(dirname)
if err != nil { ... }
infos := make([]fs.FileInfo, 0, len(entries))
for _, entry := range entries {
info, err := entry.Info()
if err != nil { ... }
infos = append(infos, info)
}
▸ Example
func ReadFile ¶
func ReadFile(filename string) ([]byte, error)
ReadFile reads the file named by filename and returns the contents. A successful call returns err == nil, not err == EOF. Because ReadFile reads the whole file, it does not treat an EOF from Read as an error to be reported.
Deprecated: As of Go 1.16, this function simply calls os.ReadFile.
▸ Example
func TempDir ¶
func TempDir(dir, pattern string) (name string, err error)
TempDir creates a new temporary directory in the directory dir. The directory name is generated by taking pattern and applying a random string to the end. If pattern includes a "*", the random string replaces the last "*". TempDir returns the name of the new directory. If dir is the empty string, TempDir uses the default directory for temporary files (see os.TempDir). Multiple programs calling TempDir simultaneously will not choose the same directory. It is the caller's responsibility to remove the directory when no longer needed.
Deprecated: As of Go 1.17, this function simply calls os.MkdirTemp.
▸ Example
▸ Example (Suffix)
func TempFile ¶
func TempFile(dir, pattern string) (f *os.File, err error)
TempFile creates a new temporary file in the directory dir, opens the file for reading and writing, and returns the resulting *os.File. The filename is generated by taking pattern and adding a random string to the end. If pattern includes a "*", the random string replaces the last "*". If dir is the empty string, TempFile uses the default directory for temporary files (see os.TempDir). Multiple programs calling TempFile simultaneously will not choose the same file. The caller can use f.Name() to find the pathname of the file. It is the caller's responsibility to remove the file when no longer needed.
Deprecated: As of Go 1.17, this function simply calls os.CreateTemp.
▸ Example
▸ Example (Suffix)
func WriteFile ¶
func WriteFile(filename string, data []byte, perm fs.FileMode) error
WriteFile writes data to a file named by filename. If the file does not exist, WriteFile creates it with permissions perm (before umask); otherwise WriteFile truncates it before writing, without changing permissions.
Deprecated: As of Go 1.16, this function simply calls os.WriteFile.
▸ Example