gdi32 install fonts for session with non latin names-CodePudding

I am trying to install fonts in a temporary manner for the current session via a PowerShell script.

My current script is provided below, but the problem is that if the font is called "somelatin_font.ttf" it will work fine, but if the font has some non Latin characters (example Japanese) in its name, it will fail to install


$dir="fonts"

$signature = @'
[DllImport("gdi32.dll")]
 public static extern int AddFontResource(string lpszFilename);
'@

$type = Add-Type -MemberDefinition $signature `
    -Name FontUtils -Namespace AddFontResource `
    -Using System.Text -PassThru

foreach($font in  (Get-ChildItem -LiteralPath $dir -Recurse  | Where-Object {$_.extension -in ".ttf", ".otf"}) ) {   
    $ffn= $font.FullName
    echo "loading($ffn)" >> file.txt
    $type::AddFontResource($font)
}

I also tried adding CharSet = CharSet.Auto or unicode but neither of them worked:

[DllImport("gdi32.dll", CharSet=CharSet.Unicode)]

The error I get when I add this:

Add-Type : Cannot add type. The type name 'AddFontResource.FontUtils' already exists.

Does anyone have an idea on how to handle this?

Thanks

CodePudding user response：

For full Unicode support, you must qualify your P/Invoke declaration with CharSet = CharSet.Unicode, which ensures that the Unicode version of the WinAPI function, i.e. AddFontResourceW, is (implicitly) referenced:

$signature = @'
  [DllImport("gdi32.dll", CharSet = CharSet.Unicode)]
  public static extern int AddFontResource(string lpszFilename);
'@

$type =
  Add-Type -MemberDefinition $signature `
    -Name FontUtils -Namespace AddFontResource `
    -Using System.Text -PassThru

Note:

If you get error message The type name 'AddFontResource.FontUtils' already exists., start a new session, because that implies that a previous definition of that type prevents its redefinition.