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Description
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The ShowMessageFmt
procedure provides 'C' like formatting of multiple
of simple data types into a string that is
displayed in a single. It provides very precise
control over this formatting.
The Formatting parameter defines
how the Data array is manipulated
into the displayed string.
The dialog has an OK button to allow the user to
register the message and close the dialog.
The Formatting string can comprise
a mix of ordinary characters (that are passed
unchanged to the result string), and data
formatting characters. This formatting is best
explained by the example code.
In simple terms, each data formatting substring
starts with a % and ends with a
data type indicator :
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d
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= Decimal (integer)
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e
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= Scientific
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f
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= Fixed
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g
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= General
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m
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= Money
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n
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= Number (floating)
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p
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= Pointer
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s
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= String
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u
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= Unsigned decimal
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x
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= Hexadecimal
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The general format of each formatting substring is
as follows:
%[Index:][-][Width][.Precision]Type
where the square brackets refer to optional
parameters, and the : . -
characters are literals, the first 2 of which are
used to identify two of the optional arguments.
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Related commands
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InputBox
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Display a dialog that asks for user text
input, with default
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InputQuery
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Display a dialog that asks for user text
input
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MessageDlg
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Displays a message, symbol, and selectable
buttons
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MessageDlgPos
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Displays a message plus buttons at a given
screen position
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PromptForFileName
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Shows a dialog allowing the user to select a
file
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ShowMessage
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Display a string in a simple dialog with an
OK button
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ShowMessagePos
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Display a string in a simple dialog at a
given screen position
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Example code : Showing
all of the formatting data types
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var
text : string;
begin
// Just 1
data item
ShowMessageFmt('%s',
['Hello']);
// A mix
of literal text and a data
item
ShowMessageFmt('String
= %s', ['Hello']);
WriteLn('');
//
Examples of each of the data
types
ShowMessageFmt('Decimal =
%d', [-123]);
ShowMessageFmt('Exponent
= %e', [12345.678]);
ShowMessageFmt('Fixed =
%f', [12345.678]);
ShowMessageFmt('General =
%g', [12345.678]);
ShowMessageFmt('Number
= %n', [12345.678]);
ShowMessageFmt('Money =
%m', [12345.678]);
ShowMessageFmt('Pointer =
%p', [addr(text)]);
ShowMessageFmt('String
= %s', ['Hello']);
ShowMessageFmt('Unsigned
decimal = %u', [123]);
ShowMessageFmt('Hexadecimal =
%x', [140]);
end;
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Show full unit code
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Hello
String = Hello
Decimal =
-123
Exponent
= 1.23456780000000E+004
Fixed =
12345.68
General =
12345.678
Number
= 12,345,68
Money =
?12,345.68
Pointer =
0069FC90
String
= Hello
Unsigned decimal = 123
Hexadecimal =
8C
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Example code : Using the
index, width and precision values
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begin
// The
width value dictates the output
size
// with
blank padding to the left
// Note
the <> characters are added to show
formatting
ShowMessageFmt('Padded
decimal =
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