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When you execute the code, it returns the following result − (let ((in (open "/tmp/myfile.txt" :if-does-not-exist nil))) However, we can read from this file using the read-line function. The :direction :output keywords allows us do this. When you execute the code, it does not return anything however, our data is written into the file. Please note that all input-output functions discussed in the previous chapter, such as, terpri and format are working for writing into the file we created here. (format stream "Submit your Tutorials, White Papers and Articles into our Tutorials Directory.") (format stream "This is a tutorials database") (format stream "Welcome to Tutorials Point!") (with-open-file (stream "/tmp/myfile.txt" :direction :output)
Error writing closing file autocad code#
The options are same as the keyword arguments to the function open.Ĭreate a new source code file named main.lisp and type the following code in it. With-open-file (stream filename *)įilename is the name of the file to be opened it may be a string, a pathname, or a stream. Once the job is done, it automatically closes the file. The with-open-file allows reading or writing into a file, using the stream variable associated with the read/write transaction. The :external-format argument specifies an implementation-recognized scheme for representing characters in files.įor example, you can open a file named myfile.txt stored in the /tmp folder as − Nil - it does not create a file or even a stream, but instead simply returns nil to indicate failure. :create - it creates an empty file with the specified name and then uses it. The :if-does-not-exist argument specifies the action to be taken if a file of the specified name does not already exist. Nil - it does not create a file or even a stream just returns nil to indicate failure. :supersede - it supersedes the existing file. :append - it appends to the existing file. :rename-and-delete - it renames the existing file and then deletes it.
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:new-version - it creates a new file with the same name but larger version number. If the direction is :input or :probe, this argument is ignored. The :if-exists argument specifies the action to be taken if the :direction is :output or :io and a file of the specified name already exists. The :element-type specifies the type of the unit of transaction for the stream. :probe - for just checking a files existence the stream is opened and then closed. :input - for input streams (default value) The :direction keyword specifies whether the stream should handle input, output, or both, it takes the following values − The keyword arguments specify the type of stream and error handling ways. The filename argument is the name of the file to be opened or created. Open filename &key :direction :element-type :if-exists :if-does-not-exist :external-format All operations on the stream are basically equivalent to operations on the file. When a file is opened, a stream object is constructed to represent it in the LISP environment. However, the with-open-file is usually more convenient and more commonly used, as we will see later in this section. It is the most basic function for opening a file. You can use the open function to create a new file or to open an existing file. This chapter will take you through important functions/macros for the file management. In this chapter we will see how LISP can create, open, close text or binary files for their data storage.Ī file represents a sequence of bytes, does not matter if it is a text file or binary file. Only difference is in this case the stream we use is not standard input or output, but a stream created for the specific purpose of writing into or reading from files. All these functions work for reading from and writing into text and binary files too. We have discussed about how standard input and output is handled by common LISP.