Using NSError

[dmzkrsk]

I try to write code, that trashes file and I need to get error details if it fails

func TrashItem(filePath string) error {
	fileURL := foundation.NewURLFileURLWithPathIsDirectoryRelativeToURL(filePath, false, nil)
	fm := foundation.FileManager_DefaultManager()

	var fe = foundation.NewError()
	ok := fm.TrashItemAtURLResultingItemURLError(fileURL, nil, fe) // also tried &fe

	fmt.Printf("ok=%#v, err=%#v\n", ok, fe)

	if fe.IsNil() {
		fmt.Printf("is nil\n")
	} else {
		fmt.Printf("LocalizedDescription=%#v\n", fe.LocalizedDescription())
        }

	return nil
}

But it panics at fe.LocalizedDescription

SIGSEGV: segmentation violation
PC=0x19093207c m=0 sigcode=2 addr=0x4
signal arrived during cgo execution

I use branch 0.5.0

[programmingkidx]

Does this work: ok := fm.TrashItemAtURLResultingItemURLError(fileURL, nil, unsafe.Pointer(&fe))

…

On Mon, May 6, 2024 at 8:53 AM Алексей Трофимов ***@***.***> wrote: I try to write code, that trashes file and I need to get error details if it fails func TrashItem(filePath string) error { fileURL := foundation.NewURLFileURLWithPathIsDirectoryRelativeToURL(filePath, false, nil) fm := foundation.FileManager_DefaultManager() var fe = foundation.NewError() ok := fm.TrashItemAtURLResultingItemURLError(fileURL, nil, fe) // also tried &fe fmt.Printf("ok=%#v, err=%#v\n", ok, fe) if fe.IsNil() { fmt.Printf("is nil\n") } else { fmt.Printf("LocalizedDescription=%#v\n", fe.LocalizedDescription()) } return nil } But it panics at fe.LocalizedDescription SIGSEGV: segmentation violation PC=0x19093207c m=0 sigcode=2 addr=0x4 signal arrived during cgo execution I use branch 0.5.0 — Reply to this email directly, view it on GitHub <#254>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AETFLRPOIP6AVDVYI4FDU7TZA54K3AVCNFSM6AAAAABHI7OSPKVHI2DSMVQWIX3LMV43ERDJONRXK43TNFXW4OZWGYYTOOBQGM> . You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>

[dmzkrsk]

cannot use unsafe.Pointer(&fe) (value of type unsafe.Pointer) as foundation.IError value in argument to fm.TrashItemAtURLResultingItemURLError: unsafe.Pointer does not implement foundation.IError (missing method Autorelease)

[programmingkidx]

Do you know the exact git commit of the repo you are using?

[dmzkrsk]

https://github.com/progrium/macdriver/tree/v0.5.0-preview

[programmingkidx]

I see what is wrong. The function TrashItemAtURLResultingItemURLError should have this signature: func (f_ FileManager) TrashItemAtURLResultingItemURLError(url IURL, outResultingURL unsafe.Pointer, error unsafe.Pointer) bool. It does not. This is a problem I did create an issue for here: #255.

To solve your issue now you would want to run these commands:

1. cd into your macdriver folder.
2. run 'make generate/symbols.zip'
3. run 'go generate ./macos/foundation'
4. Try running your program again.

I created this program to test your function:

package main

import (
	"fmt"
        "unsafe"
	"github.com/progrium/macdriver/macos/foundation"
)

func main() {    
    TrashItem("./eraseme.rtf")
}

func TrashItem(filePath string) error {
	fileURL := foundation.NewURLFileURLWithPathIsDirectoryRelativeToURL(filePath, false, nil)
	fm := foundation.FileManager_DefaultManager()

	var fe foundation.Error
        ok := fm.TrashItemAtURLResultingItemURLError(fileURL, nil, unsafe.Pointer(&fe))

	fmt.Printf("ok=%#v, err=%#v\n", ok, &fe)

	if fe.IsNil() {
		fmt.Printf("is nil\n")
	} else {
		fmt.Printf("LocalizedDescription=%#v\n", fe.LocalizedDescription())
        }

	return nil
}

I made a file called eraseme.rtf and it was successfully moved into the trash. I only had to change the fe variable to type foundation.Error and wrap it in an unsafe.Pointer(&fe) call in the method call.

Hope this helps.

[programmingkidx]

I made a document detailing the problem you experienced. I was wondering if you could review it and let me know if this would have helped you.

https://github.com/progrium/macdriver/wiki/Issues-with-NSError-and-other-arguments-using-pointer-to-pointer-types