CODEWITHSUNDEEP
.netwindowspowershellopenfiledialog
Luis Marsano
Luis Marsano

Reputation: 23

How to obtain path with mapped network drive from .NET file dialog

I see many questions on how to get UNC paths from mapped drive letters, but none on the reverse problem.

On different Windows 7 Enterprise machines, I'm getting different answers for the FileName of System.Windows.Forms.OpenFileDialog instances with the exact same input, current directory, and network drive mapping:

  1. one computer answers with a UNC path

    PS A:\Liver\Department\Records\check log> .\sign-log.ps1
VERBOSE: Writing signature to \\liver53-pc.ad.institute.edu\Documents\Liver\Department\Records\check log\00\check log.xlsx.sig

  2. others answer with a mapped drive path

    PS A:\Liver\Department\Records\check log> .\sign-log.ps1
VERBOSE: Writing signature to A:\Liver\Department\Records\check log\00\check log.xlsx.sig

I need every computer to answer with mapped drive paths: the command-line program receiving the FileName doesn't understand UNC paths. Here are the contents of sign-log.ps1:

Add-Type -AssemblyName System.Windows.Forms
function Sign-Log ($file = '.\check-log.xlsx') {
    $FileBrowser = New-Object System.Windows.Forms.OpenFileDialog -Property @{
        Title = 'Select'
        ; InitialDirectory = (Get-Location).Path
        ; Filename = 'check log.xlsx'
        ; Filter = 'Excel Spreadsheet (*.xlsx;*.xls)|*.xlsx;*.xls|Any file (*.*)|*.*'
        ; ShowHelp = $true
    }
    if ($FileBrowser.ShowDialog() -eq [System.Windows.Forms.DialogResult]::OK) {
        $file = $FileBrowser.FileName
        $dest = $file + '.sig'
        if (Test-Path -Path $dest) {
            Write-Verbose -Message ('Appending signature to {0}' -f $dest)
            Add-Content -Path $dest -Value (gpg '-ao' '-' '-b' $file)
        } else {
            Write-Verbose -Message ('Writing signature to {0}' -f $dest)
            gpg '-ao' $dest '-b' $file
        }
        gpg '--verify' $dest
    }
    $FileBrowser.Dispose()
}
Sign-Log

What do I need to do to always get mapped drive paths?

Upvotes: 1

Views: 898

Answers (1)

briantist
briantist

Reputation: 47792

I think the best bet would be to test for a UNC path being returned, and if so, temporarily map it to a drive letter, then send that to gpg. Maybe something like this:

if (([uri]$dest).IsUnc) {
    $destPath = $dest | Split-Path -Parent
    # Find a free drive letter
    $letter = ls function:[d-z]: -n | ?{ !(test-path $_) } | Select-Object -Last 1
    New-PSDrive -Name $letter[0] -Root $destPath -Persist -PSProvider FileSystem
    $dest = $destPath | Join-Path -ChildPath $file
}

# Then after you're done calling gpg:
if ($destPath) {
    Remove-PSDrive -Name $letter[0] -Force
}

This is untested..

The one-liner for getting the free drive letter came from here: Getting a free drive letter

New-PSDrive Reference

Remove-PSDrive Reference

Upvotes: 1

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