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Re: Read binary data [message #61466 is a reply to message #61376]

Wed, 16 July 2008 10:15

mankoff
Messages: 131
Registered: March 2004

Senior Member

On Jul 16, 12:13 pm, Spon <christoph.b...@gmail.com> wrote:
> On Jul 16, 4:50 pm, xiao zhang <littledd...@gmail.com> wrote:
>
>> HI~ every one ~
>> I am trying to read a binary file which is 17920168 bytes and the
>> first 168 bytes of it is header infromation, The rest of it is
>> 800*800*14 two bytes integer. (like a 3 dimention array.) Can any
>> one help me to read it out ? There should not be so many zeros in it,
>> but i tried several times it still shows a lot of zero.
>> Thanks~
>
> OpenR, Lun, MyFile, /Get_Lun
> Point_Lun, Lun, 168
> MyData = Intarr(800, 800, 14, /NoZero)
> ReadU, Lun, MyData
> Free_Lun, Lun
>
> OR:
>
> MyData = Read_Binary(MyFile, Data_Type = 2, Data_Start = 168, $
> Data_Dims = [800, 800, 14])
>
> The advantage of the first method is that it's fast. The advantage of
> the second method is that if you're running into little/big endian
> issues, you can simply set the endian keyword as needed.
>
> Here's a helpful article if you're not sure:http://www.dfanning.com/tips/endian_machines.html
>
> Regards,
>
> Chris

The first method also lets you set an endian or swap_endian keyword on
the OPEN statement.

-k.

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[Message index]

		Re: Read binary data By: xiao zhang on Wed, 16 July 2008 09:21
		Re: Read binary data By: Spon on Wed, 16 July 2008 09:13
		Re: Read binary data By: mankoff on Wed, 16 July 2008 10:15

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