Color Parsing

I want to display text on a trichedit component with different colors. I use a memory stream to enter raw rtf codes. But now my problem is how can i add the stream to the richedit leaving the contenent in tact.

Regards, Arijan
byteAsked:
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

x
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

JimBob091197Commented:
Hi

Try the following:
procedure FillRichEdit(ARichEdit: TRichEdit);
var
  MS: TMemoryStream;
begin
  MS := TMemoryStream.Create;

  // Fill memory stream with codes.
  // E.g.  MS.LoadFromFile('C:\Test.rtf');

  ARichEdit.Lines.LoadFromStream(MS);
  MS.Free;
end;

Regards,
JB
0
byteAuthor Commented:
Thanks i was so far =) but the problem with this method is that the contents of the richedit will be erased. I want to keep it.

Regards, Byte
0
JimBob091197Commented:
If you want to append to the existing text then why not save to the memory stream first, then add to the stream, then load it again?

The other way is to send the rich edit control an EM_STREAMIN message, but it's a lot more work and you have to provide a callback function.  I can give you a sample of this if you need one.

JB
0
byteAuthor Commented:
That would be great. Thx!
0
JimBob091197Commented:
The following sample inserts text at the position of the cursor.
My RichEdit control is called rchTest.

uses
  ..., RichEdit;

var
  RichMemStream: TMemoryStream;

function EdStreamCallBack(dwCookie: Longint; pbBuff: PByte; cb: Longint; var pcb: Longint): Longint; stdcall;
begin
  CopyMemory(pbBuff, RichMemStream.Memory, RichMemStream.Size);
  pcb := RichMemStream.Size;
  Result := NOERROR;
end;

procedure TForm1.Button1Click(Sender: TObject);
var
  EdStream: TEditStream;
begin
  RichMemStream := TMemoryStream.Create;

  RichMemStream.LoadFromFile('C:\Test.txt');

  FillChar(EdStream, SizeOf(TEditStream), 0);
  EdStream.pfnCallback := @EdStreamCallBack;

  RichMemStream.Position := 0;
  rchTest.Perform(EM_STREAMIN, SF_RTF or SFF_SELECTION, Integer(@EdStream));

  RichMemStream.Free;
end;


Note that I fill the memory stream by loading it from C:\Test.txt, which has the following content:

{\rtf1\ansi\deff0\deftab720
{\fonttbl{\f0\fswiss MS Sans Serif;}
{\f1\froman\fcharset2 Symbol;}
{\f2\fswiss\fcharset1 MS Sans Serif;}}
{\colortbl\red0\green0\blue0;}
\deflang1033\pard\plain\f2\fs16
\par \b Hello there.\plain
}


Regards,
JB
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Delphi

From novice to tech pro — start learning today.