问如何在go中调用user32.dll的EnumDisplaySettingsA

EN

package main

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

var (
    dll                 = syscall.MustLoadDLL("user32.dll")
    enumDisplaySettings = dll.MustFindProc("EnumDisplaySettingsA")
)

type devMode struct {
    dmDeviceName       [32]uint16
    dmSpecVersion      uint16
    dmDriverVersion    uint16
    dmSize             uint16
    dmDriverExtra      uint16
    dmFields           uint32
    dmOrientation      int16
    dmPaperSize        int16
    dmPaperLength      int16
    dmPaperWidth       int16
    dmScale            int16
    dmCopies           int16
    dmDefaultSource    int16
    dmPrintQuality     int16
    dmColor            int16
    dmDuplex           int16
    dmYResolution      int16
    dmTTOption         int16
    dmCollate          int16
    dmFormName         [32]uint16
    dmLogPixels        uint16
    dmBitsPerPel       uint32
    dmPelsWidth        uint32
    dmPelsHeight       uint32
    dmDisplayFlags     uint32
    dmDisplayFrequency uint32
    dmICMMethod        uint32
    dmICMIntent        uint32
    dmMediaType        uint32
    dmDitherType       uint32
    dmReserved1        uint32
    dmReserved2        uint32
    dmPanningWidth     uint32
    dmPanningHeight    uint32
}

func queryDisplaySettings() devMode {
    out := devMode{}
    out.dmSize = uint16(unsafe.Sizeof(out))
    outptr := uintptr(unsafe.Pointer(&out))

    namePtr := uintptr(unsafe.Pointer(nil))

    var iModeNum uint32 = 4294967295
    enumCurrentSettings := uintptr(unsafe.Pointer(&iModeNum))

    ret, _, _ := enumDisplaySettings.Call(namePtr, enumCurrentSettings, outptr)
    if ret == 0 {
        fmt.Printf("Failed EnumDisplaySettings")
    }
    return out
}

func main() {
    settings := queryDisplaySettings()

    fmt.Printf("\n%v\n", settings.dmPelsWidth)
    fmt.Printf("%v\n", settings.dmPelsHeight)
    fmt.Printf("%v\n\n", settings.dmDisplayFrequency)
}