Hi,

I made a quick and dirty script to read a DDR file in python 3.9. Please find it below:

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# imports
%matplotlib inline
import numpy as np
import matplotlib.pyplot as plt
import struct

filename = "tube_output2D.DDR"

def get_integer(file):
    return struct.unpack('I', file.read(4))[0]
def get_float(file):
    return struct.unpack('d', file.read(8))[0]

fmt_d_data = 'ddddd'
struct_len = struct.calcsize(fmt_d_data)
struct_unpack = struct.Struct(fmt_d_data).unpack_from
inc_int_pos, inc_int_ang, coh_real, coh_imag, coh_amp = [],[],[],[],[]

with open(filename,"rb") as file:
    # unpack little endian integers
    version = get_integer(file)
    type_det = get_integer(file)
    lens_units = get_integer(file)
    source_units = get_integer(file)
    source_multiplier = get_integer(file)
    print(f'{version=}')
    print(f'{type_det=}')

    i_data_len = 50 
    i_data = []
    for _ in range(i_data_len):
        i_data.append(get_integer(file))   

    x_pixels =i_data[0]
    y_pixels = i_data[1]
    n_rays_spatial_detector = i_data[2]
    n_rays_angular_detector = i_data[3]
    print(f'{x_pixels=}')
    print(f'{y_pixels=}')
    print(f'{n_rays_spatial_detector=}')
    print(f'{n_rays_angular_detector=}')
    print(f'{i_data=}')
    #  there is a gap of 4 bytes that appears between 
    # the last int member (i_data) and the first double member (d_data)
    gap = get_integer(file)   
    
    d_data = []
    for _ in range(i_data_len):
        d_data.append(get_float(file))   
    print(f'{d_data=}')   

    ray_trace_method = struct.unpack('I', file.read(4))[0]
    print(f'{ray_trace_method=}')
    while True:
        data = file.read(struct_len)
        if not data: break
        s = struct_unpack(data)
        inc_int_pos.append(s[0])
        inc_int_ang.append(s[1])
        coh_real.append(s[2])
        coh_imag.append(s[3])
        coh_amp.append(s[4])        

Hello Oliver,

You can refer the Python code for reading DDR File by Victor . This works fine which gives the these information.Thanks Oliver for your Python code . 

x_pixels=120
y_pixels=120
n_rays_spatial_detector=4748226
n_rays_angular_detector=4748226

You can also refer example 8 in our ZOS API Synatx help file to save the DDR and read each pixel flux of rectangle Detector 

Thanks

Sahil