[Overview][Types][Procedures and functions][Variables][Index] Reference for unit 'LCLIntf' (#lcl)

GetDeviceCaps

Returns various device specific information.

Declaration

Source position: winapih.inc line 124

function GetDeviceCaps(

  DC: HDC;

  Index: Integer

):Integer;

Description

Returns information about any DC (Device Context), which might be the screen DC representing the monitor, a control canvas or a off-screen bitmap canvas. The following constants can be utilized in the index argument:

An example showing how to obtain the screen DPI for the X axis using GetDeviceCaps, which is the method utilized by TScreen.PixelsPerInch: 

var
  DC: HDC;
begin
  DC := GetDC(0);
  FDPI := GetDeviceCaps(DC,LOGPIXELSX); // DPI in pixels per inch
  ReleaseDC(0, DC);
end;

See also

TScreen.PixelsPerInch

  

The number of screen pixels per virtual inch (DPI) for the screen.

HORZSIZE

  

Horizontal size in millimeters.

VERTSIZE

  

Vertical size in millimeters.

HORZRES

  

Horizontal width in pixels for a device context.

BITSPIXEL

  

Number of bits per pixel.

PLANES

  

Number of color planes.

SIZEPALETTE

  

Number of entries in the color palette.

LOGPIXELSX

  

The number of pixels per logical inch, in X (horizontal) direction.

LOGPIXELSY

  

The number of pixels per logical inch, in Y (vertical) direction.

VERTRES

  

Vertical height in pixels for a device context.

NUMRESERVED

  

Number of reserved entries in the color palette.
Version 3.2 Generated 2024-02-25 Home