Truncate − It opens an existing file and truncates its size to zero bytes.įileAccess enumerators have members: Read, ReadWrite and Write.įileShare enumerators have the following members − OpenOrCreate − It specifies to the operating system that it should open a file if it exists, otherwise it should create a new file. The members of the FileMode enumerator are −Īppend − It opens an existing file and puts cursor at the end of file, or creates the file, if the file does not exist.ĬreateNew − It specifies to the operating system that it should create a new file. The FileMode enumerator defines various methods for opening files. The syntax for creating a FileStream object is as follows −ĭim As FileStream = New FileStream(,, , )įor example, for creating a FileStream object F for reading a file named sample.txt −ĭim f1 As FileStream = New FileStream("sample.txt", FileMode.OpenOrCreate, FileAccess.ReadWrite) You need to create a FileStream object to create a new file or open an existing file. This class derives from the abstract class Stream. The FileStream class in the System.IO namespace helps in reading from, writing to and closing files. Is used for writing into a string buffer. Is used for reading from a string buffer. Is used for writing characters to a stream. Used for reading characters from a byte stream. Used for random access of streamed data stored in memory. Used to read from and write to any location in a file. Used for performing operations on directories. Helps in manipulating a directory structure. Reads primitive data from a binary stream.Ī temporary storage for a stream of bytes. The following table shows some commonly used non-abstract classes in the System.IO namespace − I/O Class The System.IO namespace has various classes that are used for performing various operations with files, like creating and deleting files, reading from or writing to a file, closing a file, etc. The input stream is used for reading data from file (read operation) and the output stream is used for writing into the file (write operation). There are two main streams: the input stream and the output stream. The stream is basically the sequence of bytes passing through the communication path. When a file is opened for reading or writing, it becomes a stream. A file is a collection of data stored in a disk with a specific name and a directory path.
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