Read and write binary file in vbscript recall list


You couldn't display all of the file on a single screen so we need to pause after each screenful of text. So when we read binary data it is extremely important that we convert it into the correct data type. The good news if you are an English speaker is that for the most part you can ignore it!

Then I'll read three lines back and ask where we are. That still leaves the awkward situation where a file is created on one OS and then processed on another, incompatible, OS and sadly, there isn't much we can do about that except to compare the end of the line with os. We will assume that read and write binary file in vbscript recall list file exists called menu. One other thing you can do while processing a file is that you can go back to the beginning. Even better, if the file doesn't exist it will open a new file just as if you'd specified "w".

A group of 4 is sometimes called a nibble! The point of all of this is that when we read a binary file we have to interpret the raw bit patterns into the correct type of data for our program. Because we wrote out the same line that we read in there was no problems with newline characters here.

Managing the creation and removal of newline characters is one of the more irritating aspects of handling text files. It is perfectly possible to interpret a stream of bytes that were originally written as a character string as a set of floating point numbers. These characters can then be encoded into a more compact data stream. I'll then go back to the beginning, read one line then jump to the third line and print it, jumping over the second line. Operating systems handle files in different ways.

There are two niggles in particular which can catch people out and we'll look at them here:. Now if you type all that code into a new text file and save it as addressbook. These kind of "cunning ploys" are often necessary when dealing with platform specific issues! The default encoding is usually UTF-8 but, in theory at least, could be different! With guarantees to close the file at the end of the with statement.

So the first 4 bytes are 10,0,0,0 in decimal or 0xA,0x0,0x0,0x0 in hexadecimal, the system usually used to display binary data - since it is much more concise than using pure binary. You couldn't display all of the file on a single screen so we need to pause after each screenful of text. Let's try using that to read our file: