Getting error while retrieving elements from DoubleArray

[coderAkshay]

Hi, I'm upgrading FesAPI from version 2.0.0.0 to 2.9.0.1.
To inspect elements from a DoubleArray, I used Marshal.Copy(swigCPtr.Handle, values, 0, count).

However, when I am using getItem from DoubleArray, then I am getting a below exception

I am not sure what is wrong here. Can you please help me out.

[philippeVerney]

Hi,

Reading array of values using CSharp is generally done using the SWIG dedicated arrays such as

FloatArray tmp = new FloatArray((long)prop.getValuesCountOfPatch(0)); // Wrap an unmanaged array of the correct size
try
{
    prop.getFloatValuesOfPatch(0, tmp.cast()); // Notice the cast!!!!
    float item = tmp.getitem(index); // Accessing an item where index is in the correct range. Here it should be between 0 and prop.getValuesCountOfPatch(0)
}
finally
{
    tmp.Dispose(); // Ensure to dispose the unmanaged arrays when we have finished to use it
}

It exists dedicated SWIG arrays for all most famous simple (POD) datatypes

[philippeVerney]

If you already use/know this approach but want to try another one such as using DoubleArray_getitem, the error you face generally comes from:

• either an index out fo boudns
• or a premature garbage collection of the swig pointer (use dispose or GC.keepalive() to guarantee the correct lifetime of the underlying array)