Solved

Color Parsing

Posted on 1997-11-24
5
148 Views
Last Modified: 2010-04-04
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
0
Comment
Question by:byte
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
  • 2
5 Comments
 
LVL 5

Expert Comment

by:JimBob091197
ID: 1351658
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
 

Author Comment

by:byte
ID: 1351659
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
 
LVL 5

Expert Comment

by:JimBob091197
ID: 1351660
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
 

Author Comment

by:byte
ID: 1351661
That would be great. Thx!
0
 
LVL 5

Accepted Solution

by:
JimBob091197 earned 200 total points
ID: 1351662
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

Featured Post

[Live Webinar] The Cloud Skills Gap

As Cloud technologies come of age, business leaders grapple with the impact it has on their team's skills and the gap associated with the use of a cloud platform.

Join experts from 451 Research and Concerto Cloud Services on July 27th where we will examine fact and fiction.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Introduction Raise your hands if you were as upset with FireMonkey as I was when I discovered that there was no TListview.  I use TListView in almost all of my applications I've written, and I was not going to compromise by resorting to TStringGrid…
In my programming career I have only very rarely run into situations where operator overloading would be of any use in my work.  Normally those situations involved math with either overly large numbers (hundreds of thousands of digits or accuracy re…
In this video we outline the Physical Segments view of NetCrunch network monitor. By following this brief how-to video, you will be able to learn how NetCrunch visualizes your network, how granular is the information collected, as well as where to f…
Do you want to know how to make a graph with Microsoft Access? First, create a query with the data for the chart. Then make a blank form and add a chart control. This video also shows how to change what data is displayed on the graph as well as form…
Suggested Courses
Course of the Month8 days, 18 hours left to enroll

615 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question