What is the use of the "ctypes.c_complex128" module in Python?

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Jayant Kumar · Accepted Answer

The "ctypes.c_complex128" module is not a separate module. It is a built-in type provided by the "ctypes" module itself. The "ctypes.c_complex128" type represents the C data type "double _Complex" and is used when working with double-precision complex numbers in C.
Here's how the "ctypes.c_complex128" type is typically used within the "ctypes" module:
Declaring Function Prototypes: When using "ctypes" to interface with C functions that expect or return double-precision complex numbers, you can specify the argument and return types as "ctypes.c_complex128". For example:
import ctypes

# Declare the C function prototype
c_function = ctypes.CDLL("mylib.so").my_function
c_function.argtypes = [ctypes.c_complex128]
c_function.restype = ctypes.c_complex128

# Call the C function with a double-precision complex number argument
result = c_function(ctypes.c_complex128(3 + 2j))

Working with Structures: If you are working with C structures that contain double-precision complex number fields, you can define the corresponding fields as "ctypes.c_complex128" within your ctypes structure definition. For example:
import ctypes

# Define the C structure
class MyStructure(ctypes.Structure):
    _fields_ = [
        ("my_complex128_field", ctypes.c_complex128),
        # other fields...
    ]

The "ctypes.c_complex128" type ensures proper representation of double-precision complex numbers when interfacing with C code using "ctypes". It ensures compatibility between Python and C, allowing you to pass double-precision complex numbers back and forth between the two domains seamlessly.
The "double _Complex" type in C represents a double-precision complex number, which consists of two double-precision floating-point values for the real and imaginary parts.
Please keep these considerations in mind when working with double-precision complex numbers and "ctypes.c_complex128" in your Python code.

What is the use of the "ctypes.c_complex128" module in Python?

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What is the use of the "ctypes.c_complex128" module in Python?

Jayant Kumar @jayantkumar314

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