Using german characters with TProcess within the CommandLine Parameter

Question

I'm trying to use german characters like "ö,a,ü" in combination with TProcess within the CommandLine parameter. More specifically I'm trying to open an Explorer window that shows a folder which includes the characters in it's name/path. Here's the code:

strFolderPath := '"C:\FolderName_Ä"'
RunProgram := TProcess.Create(nil);
RunProgram.CommandLine := 'C:\Windows\explorer.exe ' + strFolderPath;
RunProgram.Execute;
RunProgram.Free;

Apparently using ü/ä/ö in the CommandLine Property doesn't work. Which way can I use to encode them properly within the string?

Answer 1

It works for me if I convert to strFolderpath (which is probably UTF8 if your program is developed with Lazarus) to Ansi:

  uses
    LazUTF8;

  procedure TForm1.Button1Click(Sender: TObject);
  var
    strFolderPath: String;
    P: TProcess;
  begin
    strFolderPath := UTF8ToWinCP('d:\äöü');
    P := TProcess.Create(nil);
    P.CommandLine := 'C:\Windows\explorer.exe ' + strFolderPath;
  // better:
  //  P.Executable := 'C:\windows\explorer.exe';
  //  P.Parameters.Add(strFolderPath);
    P.Execute;
    P.Free;
  end;  

Note also that the TProcess.CommandLine is deprecated. The recommended way is to put the binary into TProcess.Executable and add the parameters, one by one, by TProcess.Parameters.Add(...).