golang go-ole what's wrong with my code and how to modify it.

[xiami china]

package main

import (

"fmt"

"github.com/mattn/go-ole"

"github.com/mattn/go-ole/oleutil"

)

func main() {

ole.CoInitialize(0)

defer ole.CoUninitialize()

unknown, _ := oleutil.CreateObject("ADODB.Stream")

stream, _ := unknown.QueryInterface(ole.IID_IDispatch)

defer stream.Release()

oleutil.MustPutProperty(stream, "Type", 2)

oleutil.MustPutProperty(stream, "CharSet", "utf-8")

oleutil.MustCallMethod(stream, "Open")

oleutil.MustCallMethod(stream, "WriteText", "abcdefg")

oleutil.MustPutProperty(stream, "Position", 0)

text := oleutil.MustCallMethod(stream, "ReadText")

fmt.Println(text) // i want get value 'abcdefg'

}

many thanks for you help.

[egon]

Not sure whether it helps... but always check error values returned from functions... (CreateObject/QueryInterface).

+ egon

[mattn]

Sorry It's a bug

https://github.com/mattn/go-ole/commit/c44395660b872c46fac1fae9ec380bcfda251ed0

[xiami china]

now, it works! thank you for you update.

but i have a other question about how to trans a buffer value to com method.

like this..

package main

import (

"bytes"

"fmt"

"github.com/mattn/go-ole"

"github.com/mattn/go-ole/oleutil"

)

func main() {

ole.CoInitialize(0)

defer ole.CoUninitialize()

unknown, _ := oleutil.CreateObject("ADODB.Stream")

stream, _ := unknown.QueryInterface(ole.IID_IDispatch)

defer stream.Release()

oleutil.MustPutProperty(stream, "Type", 1)

oleutil.MustCallMethod(stream, "Open")

buffer := bytes.NewBuffer([]byte("abcdefg"))

// Sub Write(ByVal Buffer)

_, err := oleutil.CallMethod(stream, "Write", buffer) // question is there, panic: unknown type

if err != nil {

fmt.Println(err)

}

oleutil.MustPutProperty(stream, "Position", 0)

oleutil.MustPutProperty(stream, "Type", 2)

oleutil.MustPutProperty(stream, "CharSet", "utf-8")

text := oleutil.MustCallMethod(stream, "ReadText").ToString()

fmt.Println(text)

}

[mattn]

stream is go's object, not an interface of COM.