我问go-ole的家伙，就像@kostix建议的那样。
解决方法如下：
d3d9通常没有COM vtbl。例如，它没有IDispatch接口。因此，您不能对d3d9使用go-ole。但是您可以通过编写所有接口来实现。
package main
import (
"fmt"
"log"
"syscall"
"unsafe"
)
const (
D3D9_SDK_VERSION = 32
)
var (
libd3d9 = syscall.NewLazyDLL("d3d9.dll")
procDirect3DCreate9 = libd3d9.NewProc("Direct3DCreate9")
)
type IDirect3D struct {
lpVtbl *IDirect3DVtbl
}
type IDirect3DVtbl struct {
QueryInterface uintptr
AddRef uintptr
Release uintptr
RegisterSoftwareDevice uintptr
GetAdapterCount uintptr
GetAdapterIdentifier uintptr
GetAdapterModeCount uintptr
EnumAdapterModes uintptr
GetAdapterDisplayMode uintptr
CheckDeviceType uintptr
CheckDeviceFormat uintptr
CheckDeviceMultiSampleType uintptr
CheckDepthStencilMatch uintptr
CheckDeviceFormatConversion uintptr
GetDeviceCaps uintptr
GetAdapterMonitor uintptr
CreateDevice uintptr
}
func (v *IDirect3D) AddRef() int32 {
ret, _, _ := syscall.Syscall(
v.lpVtbl.AddRef,
1,
uintptr(unsafe.Pointer(v)),
0,
0)
return int32(ret)
}
func (v *IDirect3D) Release() int32 {
ret, _, _ := syscall.Syscall(
v.lpVtbl.Release,
1,
uintptr(unsafe.Pointer(v)),
0,
0)
return int32(ret)
}
func (v *IDirect3D) GetAdapterCount() uint32 {
ret, _, _ := syscall.Syscall(
v.lpVtbl.GetAdapterCount,
1,
uintptr(unsafe.Pointer(v)),
0,
0)
return uint32(ret)
}
func main() {
v, r, err := procDirect3DCreate9.Call(uintptr(D3D9_SDK_VERSION))
if r != 0 && err != nil {
log.Fatal(err)
}
d3d := *((**IDirect3D)(unsafe.Pointer(&v)))
d3d.AddRef()
defer d3d.Release()
fmt.Println(d3d.GetAdapterCount())
}
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