Inside the main() define a variable "data" of type byte and a variable "err" of type error.Ĭall the ioutil.ReadFile function, passing the name of the file as an argument to it. Algorithmįirst, we need to import the “ioutil”and “fmt” packages. This function reads the entire contents of a file and returns it as a slice of bytes.
In this Example we will write a go language program to open a file in read-only mode by using the readFile() function present in the ioutil package. Output The given file is opened in read-only mode and its contents are: Print the contents of the file on the screen by converting them to strings.įmt.Println("The given file is opened in read-only mode and its contents are:\n", string(b)) Read from the file using the "file.Read" method. If it's not nil, print the error on the screen.Ĭall the "defer file.Close()" statement to close the file when the function executes successfully. Inside the main() define a variable called file and store in it the result obtained after calling the os.Open function and pass the name of the file as an argument to it.Ĭheck if the error obtained by the function is nil or not. Algorithmįirst, we need to import the fmt and os packages. We will use the Read() function in order to implement the result. In this Example we will use the open() function present in the os package in order to write a go language program to open a file in read only mode. The io.reader and buffer size are passed as arguements in this function. The primary goal of this function is to read the data in larger chunks instead of line by line and store in buffer. This function belongs to Go's bufio package. The function accepts the file to be read as argument to the function. The ReadFile() function is present in ioutil package and is used to read the given file. The make function in go language is used to create an array/map it accepts the type of variable to be created, its size and capacity as arguments. The function accepts the file whose contents are to be read as an argument and returns the contents of the file along with an error variable. The Read() function is used to read the contents of a file. In the first Example we will use open function from the os package, in the second Example we will use the ReadFile function from the ioutil package and in the third Example we will NewReader function from the bufio package respectively. In this article, we will use three Examples to open a file in read-only mode. In computer systems, the read-only mode can be set at the file or folder level, or it can be set for an entire disk or partition. This mode is used to prevent accidental changes in the data.
In Golang, read-only mode refers to a mode of operation in which a file, directory, or device can only be viewed or read, but not modified or deleted.
0 kommentar(er)
