I have a problem where, I need to use bufio.read to read a tsv file line by line and I need to record how many bytes each line Ive read is.
The problem is, It seems like I can't just initialize an empty slice and pass it into bufio.read and expect the slice to contain the entire line of the file.
file, _ := os.Open("file.tsv")
reader := bufio.NewReader(file)
b := make([]byte, 10)
for {
bytesRead, err:= reader.Read(b)
fmt.Println(bytesRead, b)
if err != nil {
break
}
}
So, for this example, since I specified the slice to be 10 bytes, the reader will read at most 10 bytes even if the line is bigger than 10 bytes.
However:
file, _ := os.Open("file.tsv")
reader := bufio.NewReader(file)
b := byte{} //or var b []byte
for {
bytesRead, err:= reader.Read(b)
fmt.Println(bytesRead, b)
if err != nil {
break
}
}
This will always read 0 bytes and I assume its because the buffer is length 0 or capacity 0.
How do I read a file Line by line, save the entire line in a variable or buffer, and return exactly how many bytes Ive read?
Thanks!