Use FileOutputStream to write binary data to a file. FileOutputStream is meant for writing streams of raw bytes such as image data. For writing streams of characters, consider using FileWriter. Write File using DataOutputStream.
There are functions provided by C libraries to seek, read, and write to binary files. Let's explain this by reading and writing a structure called rec in a binary file.
In this post, I will show you how to convert a file to a byte array and then convert a byte array to a file. To convert a file to byte array, ByteArrayOutputStream class is used. This class implements an output stream in which the data is written into a byte array. The buffer automatically grows as data is written to it.
Java 8 example to content into file. You may find examples of reading files using java 8 APIs in linked blog post. 1. Java 8 write to file using BufferedWriter. BufferedWriter is used to write text to a character or byte stream. Before printing the characters, it stores the characters in buffer and print in bunches.
The file will contain C programming is fun text. In the program, the sentence entered by the user is stored in the sentence variable. Then, a file named program.txt is opened in writing mode. If the file does not exist, it will be created. Finally, the string entered by the user will be written to this file using the fprintf () function and the file is closed.
The WriteAllBytes method opens a file, writes to it, and then closes it. Code that uses the WriteAllBytes method is simpler than code that uses a BinaryWriter object. However, if you are adding data to a file using a loop, a BinaryWriter object can provide better performance because you only have to open and close the file once.
If you want to know why your method writes System.Byte() to the text file, this is the answer: there's no StreamWriter.Write(byte()) method, but because there's a StreamWriter.Write(object) method, the StreamWriter will treat your byte array as an object, and will use the ToString() method to get the string representation of the object.
The lseek() function shall allow the file offset to be set beyond the end of the existing data in the file. If data is later written at this point, subsequent reads of data in the gap shall return bytes with the value 0 until data is actually written into the gap. In this case, the 1st call to lseek and write could be removed.