Graphic Bitmap Load problem

[Peter Lameijn]

Hello,

I am trying to use GRAPHIC BITMAP LOAD. Whatever I try, I keep on getting "Cannot write to memory" exception failure at program end.

     Graphic Bitmap Load "CHECK", 13, 13 To hBmpCheck
     XPrint Stretch hBmpCheck, 0 , (0,0) - (12,12) To (x+1*ppcmx, y+1*ppcmy) - (x+1*ppcmx + 60, y+1*ppcmy + 60)
     Graphic Bitmap Load "NOCHECK", 13, 13 To hBmpUnCheck
     XPrint Stretch hBmpUnCheck, 0 , (0,0) - (12,12) To (x+2*ppcmx, y+2*ppcmy) - (x+2*ppcmx + 60, y+2*ppcmy + 60)

The graphics are only used for printing to a printer, so they are not attached to any window.
For use of GRAPHIC BITMAP END I need to do GRAPHIC ATTACH, but I have no graphic windows. Everything works fine, but the failure on exit doesn't look very nice...
Tried CloseHandle on hBmpCheck and hBmpUnCheck, with no results.
How should I close the Bitmaps?

[Paul Dixon]

Peter,
the manual says:

To close a bitmap, select it with the GRAPHIC ATTACH statement, then execute GRAPHIC BITMAP END.

Paul.

[Dave Biggs]

Are you doing this?

GRAPHIC BITMAP LOAD TO hBmp
...
GRAPHIC ATTACH hBmp
GRAPHIC BITMAP END

Graphic Attach "Selects the graphic target (Window, Control or Bitmap)"

hee hee - like Paul said

[Peter Lameijn]

I read that, but it's very unclear to me. Both parameters are specified as the same? And I do not have a graphic window.
Do I have to create a Graphic window, just to be able to delete the bitmaps?
(It would have been easier if you just could do "GRAPHIC BITMAP END hBitmap")

Syntax
GRAPHIC ATTACH hWin???, id& [, REDRAW]

hWin???
graphic window, bitmap, or control to be used with statements.

id&
Handle of the graphic window, control, or bitmap to be used with GRAPHIC statements.

[Paul Dixon]

Peter,
you don't need a window. The ATTACH statement just determines which bitmap you want to refer to in future graphic operations. That bitmap can be in memory (hidden) or in a window (visible)

GRAPHIC ATTACH statement
Purpose
Select the graphic target (window or bitmap ) on which future drawing operations will take place.

Paul.

[Peter Lameijn]

Paul,

GRAPHIC ATTACH needs 2 parameters; what should I specify If I do not have a graphic window? (ByVal 0?)

[Paul Dixon]

Peter,
the manual says of the second parameter:

Reserved for future implementation. Must be zero (0) for a GRAPHIC WINDOW or BITMAP

Paul.

[Bob Zale]

The first parameter is the handle. The second is the unique control identifier assigned with the CONTROL ADD GRAPHIC statement. id& must be 0 for a GRAPHIC WINDOW or GRAPHIC BITMAP.

Best...

Bob Zale
PowerBASIC Inc.

[Peter Lameijn]

Ah, thanks,

Then it's clear to me. The above quote of the helpfile incorrectly says that the second parameter is a Handle... (error in helpfile)

[Peter Lameijn]

I still get access violation directly after "GRAPHIC BITMAP LOAD". The debugger says:

HEAP[Alarm_test.exe]: 
Heap block at 0013D000 modified at 0013D028 past requested size of 20<0A>
HEAP[Alarm_test.exe]: 
Invalid Address specified to RtlSizeHeap( 130000, 13d008 )<0A>

I am sure the bitmap size is specified OK. (Mono bitmap 13x13 pixels)

[Peter Lameijn]

Need to deliver application tomorrow, so I made a quick work-around.
I needed two bitmaps with a checked and an un-checked checkbox to print.
Made them with line drawing . Maybe useful to others too:

Sub CheckedBox(ByVal X As Long, ByVal Y As Long, ByVal Checked As Long)
  XPrint Width 3
  XPrint Line (x,y) - (x+36,y)
  XPrint Line (x,y) - (x,y+36)
  XPrint Line (x,y+36) - (x+36,y+36)
  XPrint Line (x+36,y) - (x+36,y+36)

  If Checked Then
    XPrint Line (x+6,y+18) - (x+6,y+30)
    XPrint Line (x+9,y+15) - (x+9,y+30)
    XPrint Line (x+12,y+24) - (x+27,y+9)
    XPrint Line (x+12,y+27) - (x+30,y+9)
  End If
  XPrint Width 1
End Sub