go - 将 Golang 与 XLib 连接起来

Question

我正在尝试使用以下代码在 Go 中使用 XLib:

package main

// #cgo LDFLAGS: -lX11
// #include <X11/Xlib.h>
import (
    "C"
    "fmt"
)

func main() {
    var dpy = C.XOpenDisplay(nil);
    if dpy == nil {
        panic("Can't open display")
    }

    fmt.Println("%ix%i", C.XDisplayWidth(), C.XDisplayHeight());
}

我正在通过以下方式编译:

go tool cgo $(FILE)

但它会导致以下错误消息:

1: error: 'XOpenDisplay' undeclared (first use in this function)
1: note: each undeclared identifier is reported only once for each function it appears in
1: error: 'XDisplayWidth' undeclared (first use in this function)
1: error: 'XDisplayHeight' undeclared (first use in this function)

知道如何解决这个问题吗？

Answer 1

cgo 对格式很挑剔:你需要将“C”导入分开，并将序言注释放在上面:

package main

// #cgo LDFLAGS: -lX11
// #include <X11/Xlib.h>
import "C"

import (
    "fmt"
)

func main() {

    var dpy = C.XOpenDisplay(nil)
    if dpy == nil {
        panic("Can't open display")
    }

    fmt.Println("%ix%i", C.XDisplayWidth(dpy, 0), C.XDisplayHeight(dpy, 0));
}