Solved

read Windows Font Size

Posted on 1997-08-14
6
379 Views
Last Modified: 2013-12-02
In a Delphi program I display text from a textfile, with
a specifiable font size on a window.
The problem off course is, that when someone on the network
has changed his
Start->Settings->Control Panel->Display->Setting->Font Size
setting to Large fonts, he can't read all of the text.

My question is:

  How can I determiner this setting in delphi (remember
  a Windows APi call, but I can get the use of parameters
  right, so please give a example procedure).

  How can I map these large fonts to small fonts
  ,calculate the font size to use (
  I mean I want the person with the large fonts settings
  to see the same size of the text in my programwindow,
  he would see if you used the small fonts settings).
  Can I just divide a certain font size by half?
  Is this a constant?

 
0
Comment
Question by:mosi
6 Comments
 
LVL 3

Expert Comment

by:mirek071497
ID: 1341420
Can't you use TFont.size property for calculating You'r display ?
When text is (in example) in TMemo then user can use ScrollBars so tell more what happened and what you need because i can't understand.
0
 
LVL 2

Expert Comment

by:icampbe1
ID: 1341421
You want the text metrics for the font.

VAR
  DC: HDC;
  SaveFont: HFont;
  Metrics: TTextMetric;
 

DC := GetDC(0);
SaveFont := SelectObject( DC, Font.Handle);
GetTextMetrics(DC, Metrics );
SelectObject(DC, SaveFont);
ReleaseDC(0, DC);

Now, you have use of the metrics, like:

MyHeight := Metrics.tmHeight + 3;

Hope this helps.

Ian C.

0
 
LVL 1

Author Comment

by:mosi
ID: 1341422

Thanx ICAMPBEL, but I rejected your answer, althrough it probably contains part of the answer, but it is not so complete that I can use it. Please clarify!

I tried your code, and when Windows 95 on this PC  is using The large font setting, I get a Metrics.tmHeight value of 16. When it is using
The small font setting, I get a Metrics.tmHeight value of 13.
Will this always be the case, on all PC's, not depending on other
settings such as resolution e.g. 1024*768 in stead of 800 * 600, or other videodrivers?

I explain again what I what to do (simplified):

I display a window on the screen which always has a width of 600 pixels.
In this window is a label. The program reads the text to display on this
label and it fontsize from the commandline.
Suppose, I have a text to display which exactly fits into that window,
when I'm using the Use small fonts setting in Windows 95, only
a part will be visible when I'm using the Use large fonts settings.
(I do not want  use scrolling),

Therefore I need a function like this;

FontSizeFromCommandline (integer) is known, e.g. 14

FontSizeToUse:= CalculateFontSizeToUse(FontSizeFromCommandline);

CalculatieFontSizeToUse must do 2 things.

 1) Detect whether the Windows 95/NT setting of the fonts to use
    is Use Large Fonts or Use Small Fonts

 2a) When the setting is Use Small Fonts: return     FontSizeFromCommandline
    (in fact: do nothing, this value is already known).
   
 2b) When the setting is Use Large Fonts: calculate a fontsize,
    depending on FontSizeFromCommandline, such that exactly the
    same text will fit onto (the same line on) the window, as if the
    setting would be Use Small Fonts.













 
0
Do You Know the 4 Main Threat Actor Types?

Do you know the main threat actor types? Most attackers fall into one of four categories, each with their own favored tactics, techniques, and procedures.

 
LVL 1

Author Comment

by:mosi
ID: 1341423
Adjusted points to 110
0
 
LVL 1

Accepted Solution

by:
jackb022197 earned 110 total points
ID: 1341424
Use the GetSysFont function from the following unit to determine the 6 designated system font:

{ ------------------------------------------------------------------------- }
{ Description:                                                              }
{    Retrieves fonts assigned to the system screen elements.                }
{                                                                           }
{ Declaration:                                                              }
{    Function GetSysFont(FontParam: TSysFont; var ResFont: TFont): Boolean; }
{                                                                           }
{ Parameters:                                                               }
{    FontParam - Enumerated type that specifies the system font to          }
{    retrieve. This is one of the following values: sfCaptionFont,          }
{    sfSmCaptionFont, sfMenuFont, sfStatusFont, sfMessageFont, sfIconFont.  }
{                                                                           }
{    ResFont - A TFont variable that can be used to store the resulting     }
{    TFont object.                                                          }
{ ------------------------------------------------------------------------- }
unit SysFont;

interface

Uses
      SysUtils, Windows, Graphics;

type
       TSysFont = (sfCaptionFont, sfSmCaptionFont, sfMenuFont,
                  sfStatusFont, sfMessageFont, sfIconFont);


Function GetSysFont(FontParam: TSysFont; var ResFont: TFont): Boolean;
procedure TFontFromLogFont(const LogFont: TLogFont; var NewFont: TFont);

implementation

{ Gets the System font setting of the passed TSysFont parameter }
Function GetSysFont(FontParam: TSysFont; var ResFont: TFont): Boolean;
var
      TempNonClientMetrics: TNonClientMetrics;
      TempLogFont: TLogFont;
      ret: boolean;
begin
      Result := false;
      If FontParam = sfIconFont then
            { The IconFont is retreived with a different method
                  than all the other system fonts }
            ret := SystemParametersInfo(SPI_GETICONTITLELOGFONT,
                        SizeOf(TempLogFont), @TempLogFont, 0)
      else
            begin
                  TempNonClientMetrics.cbSize := SizeOf(TempNonClientMetrics);
                  ret := SystemParametersInfo(SPI_GETNONCLIENTMETRICS, 0,
                              @TempNonClientMetrics, 0);
            end;

      { If call to SystemParametersInfo() not successful then exit}
      If not ret then exit;

      { Load appropriate TempNonClientMetrics field into TempLogFont }
      case FontParam of
            sfCaptionFont:
                  TempLogFont := TempNonClientMetrics.lfCaptionFont;
            sfSmCaptionFont:
                  TempLogFont := TempNonClientMetrics.lfSmCaptionFont;
            sfMenuFont:
                  TempLogFont := TempNonClientMetrics.lfMenuFont;
            sfStatusFont:
                  TempLogFont := TempNonClientMetrics.lfStatusFont;
            sfMessageFont:
                  TempLogFont := TempNonClientMetrics.lfMessageFont;
      end;

      { Convert TempLogFont into a TFont }
      TFontFromLogFont(TempLogFont, ResFont);
      Result := true;
end;

{ Converts a LogFont structure to a Delphi TFont }
procedure TFontFromLogFont(const LogFont: TLogFont; var NewFont: TFont);
var
      Style: TFontStyles;
begin
      with LogFont do
      begin
            NewFont.Name := lfFaceName;
            NewFont.Height := lfHeight;
            Style := [];

            if lfWeight > FW_REGULAR then Include(Style, fsBold);
            if lfItalic <> 0 then Include(Style, fsItalic);
            if lfUnderline <> 0 then Include(Style, fsUnderline);
            if lfStrikeOut <> 0 then Include(Style, fsStrikeOut);

            NewFont.Style := Style;
      end;
end;

end.
0
 
LVL 1

Author Comment

by:mosi
ID: 1341425
Thanx.
I accept your answer, although I guess I still have to
work out some things.
0

Featured Post

Find Ransomware Secrets With All-Source Analysis

Ransomware has become a major concern for organizations; its prevalence has grown due to past successes achieved by threat actors. While each ransomware variant is different, we’ve seen some common tactics and trends used among the authors of the malware.

Join & Write a Comment

Objective: - This article will help user in how to convert their numeric value become words. How to use 1. You can copy this code in your Unit as function 2. than you can perform your function by type this code The Code   (CODE) The Im…
Introduction Raise your hands if you were as upset with FireMonkey as I was when I discovered that there was no TListview.  I use TListView in almost all of my applications I've written, and I was not going to compromise by resorting to TStringGrid…
Excel styles will make formatting consistent and let you apply and change formatting faster. In this tutorial, you'll learn how to use Excel's built-in styles, how to modify styles, and how to create your own. You'll also learn how to use your custo…
Illustrator's Shape Builder tool will let you combine shapes visually and interactively. This video shows the Mac version, but the tool works the same way in Windows. To follow along with this video, you can draw your own shapes or download the file…

762 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

28 Experts available now in Live!

Get 1:1 Help Now