https://blog.webp.se/golang-libvips-cgo-zh/
package main
import (
"fmt"
"github.com/ebitengine/purego"
"runtime"
)
func getSystemLibrary() string {
switch runtime.GOOS {
case "darwin":
return "/usr/lib/libSystem.B.dylib"
case "linux":
return "libc.so.6"
default:
panic(fmt.Errorf("GOOS=%s is not supported", runtime.GOOS))
}
}
func getCustomLibrary() string {
switch runtime.GOOS {
case "darwin":
return "calc.dylib"
case "linux":
return "./calc.so" // 注意這裡的 ./，否則就要 symbolic link 到 /lib
default:
panic(fmt.Errorf("GOOS=%s is not supported", runtime.GOOS))
}
}
func main() {
libc, err := purego.Dlopen(getSystemLibrary(), purego.RTLD_NOW|purego.RTLD_GLOBAL)
if err != nil {
panic(err)
}
var timeFunc func() int64
purego.RegisterLibFunc(&timeFunc, libc, "time")
x := timeFunc()
fmt.Println("timeFunc from purego: ", x)
calc, err := purego.Dlopen(getCustomLibrary(), purego.RTLD_NOW|purego.RTLD_GLOBAL)
if err != nil {
panic(err)
}
var volumeFunc func(float64) float64
purego.RegisterLibFunc(&volumeFunc, calc, "volume")
res := volumeFunc(5.3)
fmt.Println("volumeFunc: ", res)
}
CGO_ENABLED=0 go build
#include <stdio.h>
#include <math.h>
double volume(double radius)
{
double volume = (4.0f / 3.0f) * M_PI * pow(radius, 3);
printf("radius: %f, volume: %f\\n", radius, volume);
return volume;
}