How Can I Import and Use C DLL Functions in My Go Program?

How to Import a DLL Function Written in C Using Go:

As a developer using Go on a Windows system, you may encounter the need to interface with DLLs written in C. Let's explore a few methods to achieve this.

1. cgo method:

The cgo package seamlessly integrates C code into Go programs. It allows you to call DLL functions directly using Go syntax. For instance:

import "C"

...

C.SomeDllFunc(...)

2. Using syscall:

The syscall package provides direct access to system call functionality, including the ability to load and interact with DLLs.

import (
    "syscall"
    "unsafe"
)

...

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

func GetModuleHandle() uintptr {
    nargs := uintptr(0)
    ret, _, callErr := syscall.Syscall(uintptr(getModuleHandle), nargs, 0, 0, 0)
    if callErr != 0 {
        abort("Call GetModuleHandle", callErr)
    }
    return ret
}

3. Additional resources:

• Go wiki page on Windows DLLs: https://github.com/golang/go/wiki/WindowsDLLs
• Writing a DLL in C and calling it from Go: https://blog.gopheracademy.com/tutorials/calling-a-c-dll-from-go

These methods allow you to integrate with DLLs effectively in your Go programs, granting access to a wide range of functionality written in C.

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