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Image on MDI parent form

Posted on 2000-04-19
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Last Modified: 2010-04-04
I wanted do display Logo on center of MDI parent form, but when I start app, image is not visible on form. How to solve that?
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Question by:siki
2 Comments
 
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by:
inthe earned 100 total points
ID: 2732696
hi,
this is a quite well known problem ,try
drop a TImage( with logo added ) on your mdi forms parent form and try this method to overcome the problem:

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  ExtCtrls;

type
  TForm1 = class(TForm)
    Image1: TImage;
    procedure FormCreate(Sender: TObject);
    procedure FormDestroy(Sender: TObject);
  private
   FClientInstance,
   FPrevClientProc : TFarProc;
  Procedure ClientWndProc(VAR Message: TMessage);
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}
PROCEDURE TForm1.ClientWndProc(VAR Message: TMessage);
VAR
  MyDC : hDC;
  Ro, Co : Word;
begin
  with Message do
case Msg of
 WM_ERASEBKGND:
   begin
    MyDC := TWMEraseBkGnd(Message).DC;
    FOR Ro := 0 TO ClientHeight DIV Image1.Picture.Height DO
    FOR Co := 0 TO ClientWIDTH DIV Image1.Picture.Width DO
    BitBlt(MyDC, Co*Image1.Picture.Width,Ro*Image1.Picture.Height,
    Image1.Picture.Width, Image1.Picture.Height,
    Image1.Picture.Bitmap.Canvas.Handle, 0, 0, SRCCOPY);
    Result := 1;
   end;
    else
     Result := CallWindowProc(FPrevClientProc, ClientHandle, Msg, wParam, lParam);
    end;
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
 FClientInstance := MakeObjectInstance(ClientWndProc);
 FPrevClientProc := Pointer(GetWindowLong(ClientHandle,GWL_WNDPROC));
 SetWindowLong(ClientHandle, GWL_WNDPROC, LongInt(FClientInstance));
end;

procedure TForm1.FormDestroy(Sender: TObject);
begin
 SetWindowLong( ClientHandle, GWL_WNDPROC, longint(FPrevClientProc));
 FreeObjectInstance( FClientInstance);
end;

end.
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LVL 3

Expert Comment

by:shenqw
ID: 2733180
var
  Bitmap:TBitmap;

procedure TMainForm.FormCreate(Sender: TObject);
begin
  Bitmap:=TBitmap.Create;
  Bitmap.LoadFromFile('c:\Yield.bmp');
  Self.Brush.Bitmap:=Bitmap;
end;

procedure TMainForm.FormClose(Sender: TObject; var Action: TCloseAction);
begin
  if Assigned(Bitmap) then FreeAndNil(Bitmap);
end;
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