Go Wiki：呼叫 Windows DLL

Go 允許您透過數種不同的方式呼叫原生 Windows 函式。

動態載入 DLL，然後呼叫其中的函式。您可以透過 SyscallX 呼叫函式（其中 X 為參數數量。如果函式的參數少於該數量，例如傳遞 7 個引數給接受 9 個引數的函式，Syscall9 仍會運作，您只需將 7 指定為 Syscall9 的第二個引數即可）。

一個使用此方法呼叫 Windows DLL 函式的範例 Go 程式

package main

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

func abort(funcname string, err error) {
    panic(fmt.Sprintf("%s failed: %v", funcname, err))
}

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

    user32, _     = syscall.LoadLibrary("user32.dll")
    messageBox, _ = syscall.GetProcAddress(user32, "MessageBoxW")
)

const (
    MB_OK                = 0x00000000
    MB_OKCANCEL          = 0x00000001
    MB_ABORTRETRYIGNORE  = 0x00000002
    MB_YESNOCANCEL       = 0x00000003
    MB_YESNO             = 0x00000004
    MB_RETRYCANCEL       = 0x00000005
    MB_CANCELTRYCONTINUE = 0x00000006
    MB_ICONHAND          = 0x00000010
    MB_ICONQUESTION      = 0x00000020
    MB_ICONEXCLAMATION   = 0x00000030
    MB_ICONASTERISK      = 0x00000040
    MB_USERICON          = 0x00000080
    MB_ICONWARNING       = MB_ICONEXCLAMATION
    MB_ICONERROR         = MB_ICONHAND
    MB_ICONINFORMATION   = MB_ICONASTERISK
    MB_ICONSTOP          = MB_ICONHAND

    MB_DEFBUTTON1 = 0x00000000
    MB_DEFBUTTON2 = 0x00000100
    MB_DEFBUTTON3 = 0x00000200
    MB_DEFBUTTON4 = 0x00000300
)

func MessageBox(caption, text string, style uintptr) (result int) {
    var nargs uintptr = 4
    ret, _, callErr := syscall.Syscall9(uintptr(messageBox),
        nargs,
        0,
        uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(text))),
        uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(caption))),
        style,
        0,
        0,
        0,
        0,
        0)
    if callErr != 0 {
        abort("Call MessageBox", callErr)
    }
    result = int(ret)
    return
}

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
}

func main() {
    defer syscall.FreeLibrary(kernel32)
    defer syscall.FreeLibrary(user32)

    fmt.Printf("Return: %d\n", MessageBox("Done Title", "This test is Done.", MB_YESNOCANCEL))
}

func init() {
    fmt.Print("Starting Up\n")
}

使用 syscall.NewProc 而不是 syscall.GetProcAddress。這些基本上是上述 syscall 的一些輔助方法，而且僅在 Windows 中可用：https://go.dev.org.tw/src/pkg/syscall/dll_windows.go

package main

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

func main() {
    var mod = syscall.NewLazyDLL("user32.dll")
    var proc = mod.NewProc("MessageBoxW")
    var MB_YESNOCANCEL = 0x00000003

    ret, _, _ := proc.Call(0,
        uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr("This test is Done."))),
        uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr("Done Title"))),
        uintptr(MB_YESNOCANCEL))
    fmt.Printf("Return: %d\n", ret)

}

透過使用「cgo」方法「連結」至函式庫（此方法適用於 Linux 和 Windows）。範例

import ("C")
...
C.MessageBoxW(...)

請參閱 cgo 以取得進一步的詳細資訊。

此內容是 Go Wiki 的一部分。