Solved

Bitmap from a RES file.

Posted on 1999-01-07
1
145 Views
Last Modified: 2010-04-04
I tried to load a BMP from a resource file.
I used LOADBITMAP to assign its return value to Tbitmap.Handle and then assigned it to SpeedButton1.Glyph. But, it dosen't work. Help me.

Robyn.
0
Comment
Question by:robyn112
1 Comment
 
LVL 8

Accepted Solution

by:
ZifNab earned 50 total points
ID: 1355149
hi robyn112,

here you got a method (not written by me)

{If 256 color bitmaps are in the resource file, assigning the handle
doesn't assign the palette. Thus, the 256 color bitmaps will end up
dithered. I use the following function to load bitmaps from resource
files}

function LoadBitmapFromResource(inst: THandle;
                                resnum: Word;
                                outBmp: TBitmap): Boolean;
var
  HResInfo: THandle;
  BMF: TBitmapFileHeader;
  MemHandle: THandle;
  Stream: TMemoryStream;
  ResPtr: PByte;
  ResSize: Longint;
begin
  result := false;
  BMF.bfType := $4D42;
  HResInfo := FindResource(inst,MakeIntResource(resnum),RT_Bitmap);
  if hResInfo = 0 then
    exit;
  ResSize := SizeofResource(inst, HResInfo);
  MemHandle := LoadResource(inst, HResinfo);
  if MemHandle = 0 then
    exit;
  try
    ResPtr := LockResource(MemHandle);
    Stream := TMemoryStream.Create;
    try
      Stream.SetSize(ResSize + SizeOf(BMF));
      Stream.Write(BMF, SizeOf(BMF));
      Stream.Write(ResPtr^, ResSize);
      Stream.Seek(0, 0);
      outBmp.LoadFromStream(Stream);  // speedbtn1.glyph.Loadfromstream
      result := true;
    finally
      Stream.Free;
    end;
  finally
    FreeResource(MemHandle);
  end;
end;

{coded by Marc Batchelor}

Regards, Zif.
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

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

Have you ever had your Delphi form/application just hanging while waiting for data to load? This is the article to read if you want to learn some things about adding threads for data loading in the background. First, I'll setup a general applica…
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…
Migrating to Microsoft Office 365 is becoming increasingly popular for organizations both large and small. If you have made the leap to Microsoft’s cloud platform, you know that you will need to create a corporate email signature for your Office 365…
Learn how to create flexible layouts using relative units in CSS.  New relative units added in CSS3 include vw(viewports width), vh(viewports height), vmin(minimum of viewports height and width), and vmax (maximum of viewports height and width).

867 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

Need Help in Real-Time?

Connect with top rated Experts

15 Experts available now in Live!

Get 1:1 Help Now