How to call dll in golang

As a programming language, Golang is widely loved by developers for its powerful concurrency capabilities and efficient performance. In actual development, we may involve interaction with DLL (dynamic-link library) files. How to call DLL in Golang has become an important issue. This article will introduce how Golang calls DLL and provide a practical example.

1. Introduction to Windows DLL

In the Windows operating system, DLL is the abbreviation of dynamic link library, which is an important type of executable file. DLL files contain a series of functions and data for program calls. These functions can be called through different programming languages, such as C/C, C# and Delphi, etc. You can also directly use the interface of DLL files in Golang.

2. Calls between Go and DLL libraries

In Golang, calls to DLL files are usually done using cgo. When using cgo, we need to use import "C" to connect the Go and C languages. The interaction between Golang and C language can be achieved by defining C language functions in Golang, and then linking Golang and C language through the cgo mechanism. The following uses a practical example to demonstrate how to call DLL in Golang.

3. Example

We are going to use the following DLL dynamic link library for demonstration:

#include <stdio.h>

int add(int a, int b)
{
    return a + b;
}

This is a simple DLL dynamic link library that defines a simple addition function add, used to return the sum of two integers. Below, we will demonstrate the interaction between Golang and C language and how Golang calls DLL through the following steps:

1. Define C language functions in Go

Define C language functions in Go The function is relatively simple, you only need to follow the following steps:

package main

import (
    "fmt"
    "unsafe"
)

//#include <stdio.h>
import "C"

// 定义C函数
func Add(a, b int) int {
    return int(C.add(C.int(a), C.int(b)))
}

func main() {
    a := 3
    b := 4
    c := Add(a, b)
    fmt.Printf("%d + %d = %d
", a, b, c)
}

In this example, we load the C language library by import "C" and define an Add function, which will be exposed For use by Golang code. Note that in the Add function, we need to call the add function in the C language dynamic link library through the add function in C, and we also need to convert the int type to the C.int type.

2. Compile

After completing the writing of the code, we need to use the following command to compile in Golang:

go build -o main.exe

3. Run

to complete the compilation Finally, we run our program through the following command:

.main.exe

We can see the program output:

3 + 4 = 7

At this point, we have completed the process of Golang calling the DLL.

4. Summary

This article introduces the interaction between Golang and DLL files. The specific implementation is completed through cgo. In practice, we can complete the interaction between Golang and DLL by defining C language functions in Golang and using functions in the C language dynamic link library. In fact, Golang can also call the DLL interface through the syscall package, but in some complex cases, it may be more convenient to use Cgo. Therefore, Golang calling DLL is an important knowledge point. In actual development, it needs to be mastered to develop Golang programs more efficiently.

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