Convert byte array to an integer/long/double

[TheObserver]

I have a byte array I'm reading in from a file. I need to be able to take n bytes from that array and convert them into an integer/long/double, such that the resultant value is equal to the four bytes.

For example, if I have these values in my byte array:
10100111
00001010
11100110
10001010

I would like to read them like this:
10100111000010101110011010001010

And produce the value:
2802509450

Thanks for your time.

 

[Diancecht]

When you say byte array you mean

byte[] data;

?

Any code snippet would be nice.

Cheers,
Dian

 

[TheObserver]

Here's what I've got...

[tt]
File file = new File(filein);
InputStream is = new FileInputStream(file);


// Get the size of the file
long length = file.length();


// Check to ensure that file is not larger than MAX_VALUE.
if (length > MAX_VALUE)
{
// File is too large
System.out.println("The File is bigger than expected.\n");
}


// Create the byte array to hold the data
byte[] bytes = new byte[(int)length];

[/tt]

 

[Diancecht]

Nice.

And what is supposed to be inside the file?

Cheers,
Dian

 

[TheObserver]

Binary data.

 

[TheObserver]

Thanks for your help...I figured it out. I'm taking the byte, casting it to an int, and multiplying by 256 to shift the value over then adding it to a local scope variable.

Thanks for your time.

 

[Diancecht]

Just in case you want another way to go:

http://www.tek-tips.com/viewthread.cfm?qid=929629

Cheers,
Dian