How to Import a C DLL Function into Go?

How to Import a DLL Function Written in C Using Go

Question:

How can you import a function from a DLL written in C using Go, similar to the DllImport attribute in C#.NET?

Answer:

There are several approaches to achieve this in Go:

1. Cgo Method:

Using cgo allows you to access DLL functions as follows:

import "C"

func main() {
    C.SomeDllFunc(...)
}

This approach essentially "links" to the DLL library. You can incorporate C code into Go and import it using the standard C method.

2. Syscall Method:

Alternatively, you can use the syscall package, as shown below:

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

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

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

3. GitHub Resource:

For a detailed guide on using DLLs in Go, refer to GitHub's documentation at: https://github.com/golang/go/wiki/WindowsDLLs

In summary, there are three primary methods to import and use DLL functions written in C within Go: cgo, syscall, and the GitHub resource mentioned above.

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