How to call C language functions in Golang?

How to call C language functions in Golang?

During the development process, sometimes you will encounter situations where you need to call functions of the C language, and Golang provides a simple and efficient way to achieve this requirement. This article will introduce how to call C language functions in Golang and provide specific code examples.

First, we need to create a file containing C language code. For example, you can create a file named c_function.c in the project root directory. In this file, we will define the C language functions that need to be called, such as the following sample code:

#include <stdio.h>

void sayHello() {
    printf("Hello from C!
");
}

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

Next, we need to call these C language functions in the Golang program. First, we need to create a Golang file named cgo_example.go and write the following code in the file:

package main

/*
#cgo CFLAGS: -g -Wall
void sayHello();
int add(int a, int b);
*/
import "C"
import "fmt"

func main() {
    // Call the C language function sayHello()
    C.sayHello()

    // Call the C language function add()
    a, b := 10, 20
    sum := C.add(C.int(a), C.int(b))
    fmt.Printf("The sum of %d and %d is %d
", a, b, int(sum))
}

In the above code, we use import "C" to import the C language package. Next, use the #cgo instruction below the import statement to tell the Golang compiler the C language code file that needs to be linked, and define the C language function that needs to be called in the subsequent comments. In the main function, we first called the C language function sayHello(), then called the C language function add() and printed the result.

In the command line, use the following command to compile and run the program:

go build -o cgo_example cgo_example.go
./cgo_example

The above is the specific implementation and code example of calling C language functions in Golang. By using CGo technology, we can easily integrate C language functions into Golang programs to achieve more flexible and powerful functions. Hope the above content is helpful to you!

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