Go Package os: Difference between revisions
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Line 29: | Line 29: | ||
<syntaxhighlight lang='go'> | <syntaxhighlight lang='go'> | ||
bs := make([]byte, 10) | bs := make([]byte, 10) | ||
f, err := os.Open("/Users/ovidiu/tmp/ | f, err := os.Open("/Users/ovidiu/tmp/test.txt") | ||
if err != nil { | if err != nil { | ||
// ... | // ... |
Revision as of 18:37, 25 August 2023
External
Internal
Overview
Reading and Writing an Entire File in/from Memory
Read with ReadFile()
To read the content of an entire file into a byte slice:
bs, err := os.ReadFile("/Users/ovidiu/tmp/test.txt")
os.ReadFile()
closes the file after use.
Write with WriteFile()
To write in-memory data into a file:
s := "This\nis multi-line\nfile\ncontent\n"
err := os.WriteFile("/Users/ovidiu/tmp/test2.txt", []byte(s), 0777)
os.WriteFile()
closes the file after use.
Reading and Writing Byte Arrays
Reading
bs := make([]byte, 10)
f, err := os.Open("/Users/ovidiu/tmp/test.txt")
if err != nil {
// ...
}
for {
cnt, err := f.Read(bs)
if err != nil {
fmt.Println(err)
return
}
fmt.Println("read ", cnt, " bytes")
}
os.ReadFile()
closes the file after use.
Writing
To write in-memory data into a file:
s := "This\nis multi-line\nfile\ncontent\n"
err := os.WriteFile("/Users/ovidiu/tmp/test2.txt", []byte(s), 0777)
os.WriteFile()
closes the file after use.
TO DEPLETE
Functions
os.Open()
Works with files and directories.
os.Create()
os.File
os.File Methods
FileInfo
FileInfo Methods
- Size()
os.Args
os.Args is a string slice that holds the command-line arguments, starting with the program name. For more details on how to use see: