use ShowAndGetResult for open single file dialog

Error message

use ShowAndGetResult for open single file dialog

What it means

The v3 copy of go-common-file-dialog: ShowAndGetResults() panics when the open dialog is single-select, since the multi-results COM path is only valid for dialogs created with the multiselect flag. The library treats the mismatch as a programming error rather than returning an error.

Source

Thrown at v3/internal/go-common-file-dialog/cfd/iFileOpenDialog.go:68

	}
	if isMultiselect {
		// We should panic as this error is caused by the developer using the library
		panic("use ShowAndGetResults for open multiple files dialog")
	}
	if err := fileOpenDialog.Show(); err != nil {
		return "", err
	}
	return fileOpenDialog.GetResult()
}

func (fileOpenDialog *iFileOpenDialog) ShowAndGetResults() ([]string, error) {
	isMultiselect, err := fileOpenDialog.isMultiselect()
	if err != nil {
		return nil, err
	}
	if !isMultiselect {
		// We should panic as this error is caused by the developer using the library
		panic("use ShowAndGetResult for open single file dialog")
	}
	if err := fileOpenDialog.Show(); err != nil {
		return nil, err
	}
	return fileOpenDialog.GetResults()
}

func (fileOpenDialog *iFileOpenDialog) SetTitle(title string) error {
	return fileOpenDialog.vtbl.setTitle(unsafe.Pointer(fileOpenDialog), title)
}

func (fileOpenDialog *iFileOpenDialog) GetResult() (string, error) {
	isMultiselect, err := fileOpenDialog.isMultiselect()
	if err != nil {
		return "", err
	}
	if isMultiselect {
		// We should panic as this error is caused by the developer using the library

View on GitHub (pinned to 0e754b1b40)

Solutions

Use ShowAndGetResult() (singular) for single-select dialogs
Enable the multiselect option at dialog creation if multiple files are expected

Example fix

// before
paths, err := dialog.ShowAndGetResults() // single dialog: panics

// after
path, err := dialog.ShowAndGetResult()

Defensive patterns

Strategy: type-guard

Validate before calling

// single-select: singular helper
path, err := dialog.ShowAndGetResult()

Type guard

func openOneV3(d cfd.Dialog) (string, error) {
    return d.ShowAndGetResult()
}

Prevention

Use the paired ShowAndGet* helpers instead of manual sequences
Update call sites whenever you flip the multiselect flag

When it happens

Trigger: Calling ShowAndGetResults() on a default single-select open dialog in a v3 app.

Common situations: Reusing multi-select sample code for a plain open dialog; refactoring a dialog between single and multi modes without updating call sites.

Related errors

AI-assisted analysis of wailsapp/wails@0e754b1b40 (2026-08-15). Data as JSON: /api/errors/a4c3e4459ca3c2d6. Report an issue: GitHub.