How to Convert a C `[1024]char` Array to a Go `[1024]byte` Array?

Go: Converting [1024]C.char to [1024]byte

Introduction

In Go, interfacing with C code can involve type conversions. One common need is to convert a C char array to a Go byte array. This article explores how to achieve this.

Conversion Techniques

The error encountered while attempting interface conversion suggests that a direct conversion is not feasible. Instead, we can consider the following techniques:

Method 1: Copying to a Slice

To avoid a direct type conversion, you can copy the C char array to a Go slice. This can be done using C.GoBytes().

mySlice := C.GoBytes(unsafe.Pointer(&C.my_buff), C.BUFF_SIZE)

Method 2: Using Unsafe Casting for Direct Memory Access

For direct memory access without copying, you can use unsafe casting through an unsafe.Pointer.

mySlice := unsafe.Slice((*byte)(unsafe.Pointer(&C.my_buf)), C.BUFF_SIZE)

Array Type Conversion (Optional)

If you need an array type, you can convert the slice to an array.

myArray := ([C.BUFF_SIZE]byte)(mySlice)

Note: Remember that unsafe casting requires caution as it bypasses type safety checks. Always consider the potential risks before using this method.

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