How Can I Import a C DLL Function into Go?

Importing a DLL Function Written in C Using Go

To import a function from a DLL written in C using Go, several approaches are available.

Option 1: cgo

The cgo package enables the direct invocation of C functions from Go code. To do so:

import "C"

C.SomeDllFunc(...)

Option 2: syscall

The syscall package can be used to load and call functions from DLLs. Here's an example:

import (
    "fmt"
    "syscall"
    "unsafe"
)

kernel32, _        := syscall.LoadLibrary("kernel32.dll")
getModuleHandle, _ := syscall.GetProcAddress(kernel32, "GetModuleHandleW")

func GetModuleHandle() uintptr {
    ret, _, _ := syscall.Syscall(uintptr(getModuleHandle), 0, 0, 0, 0)
    return ret
}

Option 3: Using a Helper Library

GitHub hosts a page that simplifies the process of interfacing with DLLs from Go: https://github.com/golang/go/wiki/WindowsDLLs.

In summary, there are three primary methods to import a DLL function written in C using Go: cgo, syscall, and helper libraries. Each approach has its benefits and drawbacks, allowing developers to choose the best fit for their specific needs.

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