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Re: reading unformatted data into a structure [message #29744 is a reply to message #29742]

Tue, 19 March 2002 00:38

ignore_this_adress
Messages: 3
Registered: June 2001

Junior Member

Rick Towler wrote:

> I have an unformatted data file which I am trying to read and I am having
> only limited success. The data file was created on a Sun machine and it is
> being read on a win32 machine (I have set the swap_if_little_endian keyword
> on the open statement). As for the file format, all I have to go on is the
> C header file that describes the records in the file.

>
> Am I doing this correctly? I know I am close because I get what seems like
> a valid time and I know I get a valid datum. But my data doesn't seem
> right. I just want to check that I am using the correct types in my IDL
> struct and that I am reading in the data correctly.

Most compilers have switches to set memory alignment. This has of course to
match the way the IDL structure is aligned in memory for IDL to read in the
struct properly. Without other tools, I would try the following :
count the total number of allocated bytes in the header, and compare it to
the raw data filesize. If the sizes don't match, you'll know you have run
into
problems. Alternatively, you can count the number of elements in the IDL
struct :-) If the size match, you'll probably have the right data.

Using a hexeditor may be informative when looking at your raw data format.

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[Message index]

		Re: reading unformatted data into a structure By: Nigel Wade on Wed, 20 March 2002 02:20
		Re: reading unformatted data into a structure By: Rick Towler on Tue, 19 March 2002 09:54
		Re: reading unformatted data into a structure By: David Fanning on Tue, 19 March 2002 09:23
		Re: reading unformatted data into a structure By: Rick Towler on Tue, 19 March 2002 08:49
		Re: reading unformatted data into a structure By: Nigel Wade on Tue, 19 March 2002 02:26
		Re: reading unformatted data into a structure By: Nigel Wade on Tue, 19 March 2002 01:42
		Re: reading unformatted data into a structure By: ignore_this_adress on Tue, 19 March 2002 00:38
		Re: reading unformatted data into a structure By: David Fanning on Mon, 18 March 2002 18:52

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