Computers DPI setting?

[BRENT GARDNER]

Hi,

Anyone know how to get a computers DPI setting? It looks like it should
be 96 or 120. I have mine set at 120 with 1024 x 768 res. and it is very
easy to read text. Causes me problems with bitmaps in my code, so I
have to created a smaller size bitmap to install on other computers.

Thanks,

Brent

[Pierre Bellisle]

Hey Brent,
they old GetDeviceCaps trick should do...

#COMPILE EXE '#Win 8.04#
#DIM ALL
#INCLUDE "WIN32API.INC" '#2005-01-27#
'______________________________________________________________________________
 
FUNCTION PBMAIN () AS LONG
 LOCAL hDC  AS DWORD
 LOCAL dpiY AS LONG
 LOCAL dpiX AS LONG
 
 hDC  = GetDc(%HWND_DESKTOP)
 dpiX = GetDeviceCaps(hDC, %LOGPIXELSX) 'Thank to Börje Hagsten
 dpiY = GetDeviceCaps(hDC, %LOGPIXELSY)
 ReleaseDc %HWND_DESKTOP, hDC
 
 MessageBox %HWND_DESKTOP, _
            "Dot Per Inch horizontally is" & STR$(dpiX) & $CRLF & _
            "Dot Per Inch vertically is"   & STR$(dpiY), _
            "Screen DPI", %MB_ICONINFORMATION OR %MB_OK
 
 MsgBox "Dot Per Inch : " +  STR$(dpiY) & $CRLF &  $CRLF & _
        "Font: " +  STR$(dpiY / 96 * 100) + "% of normal size"
 
END FUNCTION
'______________________________________________________________________________

[BRENT GARDNER]

Pierre,

Very nice - this will help alot. Thank you!
I use a trial and error magic number to change bitmap size created
with DPI set at 120. 76% x Width and 81% x Height of bitmap made in
1024 x 768 res. Can't make sense of the numbers to create formula.
Just know that resizing bitmap this way will work on other computers
res. 800 x 600 and 1280 x 800. Must be to do with font size?

Thanks Again,

Brent