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Delphi XE LoadFromResourceName resource not found

Posted on 2013-05-31
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1,864 Views
Last Modified: 2013-08-19
I have created a component inherited from an image button. I have added the up and down images to the resource image list using the 'Project|Resources and Images' menu option .
the bitmaps appear in the Project Manager and it all compiles an installs just fine.
When I use the button in my project there are no errors and the button image is used when viewed in the design window.
My project compiles just fine but when I try to open the window when running the program it give an error:


error message
the create code for the button is:

constructor TSMfcImageBtn.create(aowner:tcomponent);
var
buttonup,buttondown : Tbitmap;
begin
inherited;
try
  buttonup := Tbitmap.Create;
  buttonup.LoadFromResourceName(hInstance,'ButtonUp');
  image.loadfrombitmap(buttonup);
  buttondown := Tbitmap.Create;
  buttondown.LoadFromResourceName(hInstance,'ButtonDown');
  imagedown.loadfrombitmap(buttondown);
finally
  buttonup.Free;
  buttondown.Free;
end;
offsets.GlyphX := 0;
offsets.GlyphY := 0;
offsets.ImageDownX := 0;
offsets.ImageDownY := 0;
offsets.TextDownX := 0;
offsets.TextDownY := 0;
offsets.TextX := 0;
offsets.Texty := 0;
end;


Any ideas
0
Comment
Question by:RipBucks
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3 Comments
 
LVL 27

Accepted Solution

by:
Sinisa Vuk earned 500 total points
ID: 39211630
This way your component Hinstance is not equal to Application Hinstance. So, your code need little reworking. Also you need to check if resource exists first. Second thing is that if exception comes on first bitmap because of resource - try..finally block forces to free second image which is not created at this time ... great mistake.

var
  buttonup,buttondown : Tbitmap;
  hInst, MyRes: Cardinal;
begin
  buttonup := Tbitmap.Create;
  buttondown := Tbitmap.Create;
  try
    hInst := FindClassHInstance(Self.ClassType);
    if hInst>0 then
    begin
      MyRes := FindResource(hInst, 'ButtonUp', RT_Bitmap);
      if MyRes>0 then
      begin
        buttonup.LoadFromResourceName(hInst,'ButtonUp');
        image.loadfrombitmap(buttonup);
      end;

      MyRes := FindResource(hInst, 'ButtonDown', RT_Bitmap);
      if MyRes>0 then
      begin
        buttondown.LoadFromResourceName(hInst,'ButtonDown');
        imagedown.loadfrombitmap(buttondown);
      end;
    end;
  finally
    buttonup.Free;
    buttondown.Free;
  end;

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0
 

Author Comment

by:RipBucks
ID: 39218449
Thanks for the code but FindResource won't compile. I can find it in the help but it does not appear in my system unit. Nor does the program know what RT_Bitmap is.
So I can't test if this is a solution
0
 
LVL 27

Expert Comment

by:Sinisa Vuk
ID: 39220109
Add Windows in uses.
0

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