[Lazarus] TProcess, UTF8, Windows

[Marcos Douglas]

On Thu, Apr 12, 2012 at 5:30 PM, Marcos Douglas <md at delfire.net> wrote:
>
> On Thu, Apr 12, 2012 at 5:20 PM, Mattias Gaertner
> <nc-gaertnma at netcologne.de> wrote:
> > On Thu, 12 Apr 2012 12:34:59 -0300
> > Marcos Douglas <md at delfire.net> wrote:
> >
> >> Hi,
> >>
> >> I'm using the example in FreePascal wiki to execute external programs:
> >>
> >> http://wiki.freepascal.org/Executing_External_Programs#Reading_large_output
> >>
> >> I adapted this code to work in LCL, using a simple TMemo.
> >> All "write" and "writeln" was replaced with
> >> Memo1.Lines.Append(ConsoleToUTF8(<text or variable>)).
> >
> > What is the source of <text or variable>?
> > The output of the other process?
>
> I mean Write('.') or WriteLn(OutputLines[NumBytes]) etc.
> See the original code in the wiki.
>
> >> Everything works fine... but since I changed this line:
> >> OurProcess.Options := [poUsePipes];
> >> to
> >> OurProcess.Options := [poUsePipes, poNoConsole];
> >>
> >> ...the conversion ConsoleToUTF8 do not work.
> >>
> >> Any tips?
> >
> > Maybe the other process's output is not in console codepage.
> > Try
> >
> > Memo1.Lines.Append(<text or variable>)
> > or
> > Memo1.Lines.Append(SysToUTF8(<text or variable>)).
>
> I will try... but I see other problem now. The example read all buffer
> before print on screen (in my case, a TMemo).
> I want to print on time. I will change the code for this before try
> UTF8 conversion.
>
> Do you have an example for I need?

I resolved using:

procedure TConsoleTask.ReadingOutput;
var
  NoMoreOutput: Boolean;
  Buffer: string;
  BytesAvailable: DWord;
  BytesRead: LongInt;
begin
  while FProcess.Running do
  begin
    BytesRead := 0;
    BytesAvailable := FProcess.Output.NumBytesAvailable;
    if BytesAvailable > 0 then
    begin
      SetLength(Buffer, BytesAvailable);
      BytesRead := FProcess.OutPut.Read(Buffer[1], BytesAvailable);
      DoLog(Copy(Buffer, 1, BytesRead));  //<<<< here fires an event
      BytesAvailable := FProcess.Output.NumBytesAvailable;
    end
    else
      Sleep(100);
  end;
end;

IMHO, this could be present in TProcess, don't?
Or this is TAsyncProcess class serves?

Marcos Douglas