On Fri, Mar 9, 2012 at 7:26 AM, Nicola Creati <ncre...@inogs.it> wrote:
> Hello,
> I'm writing a library able to read LAS lidar files. I generally use it
> under Linux without any problems. I'm now testing my library on a Windows 7
> 64 bit computer and I meet some problems reading the file. I generally use
> fromfile function to read the file. I noted that the fromfile returns an
> arry with some zeros at the end if I read the whole file or if i read only
> a finite number of data i get only a fraction of them. By the way I have
> created a sample script that reproduces the problem I noted:
>
> """ Sample code """
> import numpy as np
>
> sz = 1000000
> data = np.random.random(sz)
>
> output = open('test.bin', 'w')
> data.tofile(output)
> output.close()
> del output
>
> print 'Original data:', data
>
> fid = open('test.bin', 'r')
> new_data = np.fromfile(fid)
> fid.close()
> del fid
> print 'Data read:', new_data
>
> fid = open('test.bin', 'r')
> slice = np.fromfile(fid, count=100)
> fid.close()
> print '100 read data:', slice
>
>
> The "new_data" array has several zeros at the end. The "slice" array has
> not 100 items. At every code run the "slice" array size changes.
>
> I'm using numpy 1.6.1 64bit (taken from Christoph Gohlke website) , with
> python 2.7.2 64 bit.
> Under Linux Ubuntu 10.10 64bit and numpy 1.6.1 the code works as expected.
> Thanks.
>
> Nicola
>
>
Use the binary mode ('wb' and 'rb') when you open the files.
Warren
>
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