CreatePaths returns OSError

[rkpamegan]

Python gives OSError: exception: access violation reading 0x0000000000000000 when calling the native function CreatePaths

dhart/src/Python/dhart/pathfinding/pathfinder_native_functions.py

Lines 112 to 121 in 0d96277

	res = HFPython.CreatePaths(
	graph_ptr,
	c_starts,
	c_ends,
	cost_str,
	byref(path_ptrs),
	byref(data_ptrs),
	byref(c_sizes),
	c_path_num,
	)

Here is a test file for the error:

from dhart.spatialstructures import Graph
from dhart.pathfinding import DijkstraFindAllShortestPaths, DijkstraShortestPath, calculate_distance_and_predecessor


g = Graph()
g.AddEdgeToGraph(0, 1, 100)
g.AddEdgeToGraph(0, 2, 50)
g.AddEdgeToGraph(1, 3, 10)
g.AddEdgeToGraph(2, 3, 10)
g.CompressToCSR()

# Define the correct path
correct_path = [[50, 0], [10, 2], [0, 3]]

# Find the same path num_paths times
num_paths = 1000
starts = [0] * num_paths
ends = [3] * num_paths
SPS = DijkstraShortestPath(g, starts, ends)

# Assert that we got an output back of the correct size
assert len(SPS) == num_paths

# Iterate through every path in the output
for SP in SPS:
    # Assert that this path isn't null
    assert(SP is not None)
    
    # Assert that it equals correctpath
    for i in range(0, len(correct_path)):
        assert correct_path[i][0] == SP[i][0]
        assert correct_path[i][1] == SP[i][1]