[Flutter] filepicker windows getfilepath returns null on startup

I am using Flutter package: filepicker_windows.

I need to open a file and extract the full filepath then display the full filepath in the text widget.

The problem is that, on app startup, the filepath shows null.

After I select a file, I see the fullpath like this:

File: 'C:\test\myfile.text'

I want to see: C:\test\myfile.text

if I try to trim or get a substring, then I get the message that I am out of range b/c the max length is 4. The 4 length refers to null.

Please advise what should I do.

Thank you

Here is my code:

File? result1;

File? selectFile() {
final file = OpenFilePicker()
..filterSpecification = {
'Text Document (*.txt)': '*.txt'
}
..defaultFilterIndex = 0
..defaultExtension = 'txt'
..title = 'Select a document';
setState(() {
result1 = file.getFile();
});
return result1;
}

String getFilePath(){
String abc1='';
setState(() {
abc1 = result1.toString();
});
return abc1;
}

Widget mytext = Text(getFilePath().length.toString());

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