在《Windows 程序设计》一书中,有相应的例子。你可以找一下源程序。如果你能等的话,我找一找,给你发过去。
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SysUtils, WinTypes, WinProcs, Messages, Classes, Graphics, Controls,
Forms, Dialogs, StdCtrls, ExtCtrls, Buttons;type
Tgetcol = class(TForm)
Panel1: TPanel;
Label1: TLabel;
Label2: TLabel;
procedure FormClick(Sender: TObject);
procedure FormMouseMove(Sender: TObject; Shift: TShiftState; X,
Y: Integer);
procedure Panel1Click(Sender: TObject);
procedure FormDblClick(Sender: TObject);
procedure FormResize(Sender: TObject);
private
tx,ty : integer;
procedure WMEraseBkng(var MSg:TWMEraseBkgnd);message WM_ERASEBKGND;
public
{ Public declarations }
end;var
getcol: Tgetcol;
implementation{$R *.DFM}
const
Digits : array[0..$F] of Char = '0123456789ABCDEF';function HexB(B : Byte) : string;
{-Return hex string for byte}
begin
HexB[0] := #2;
HexB[1] := Digits[B shr 4];
HexB[2] := Digits[B and $F];
end;procedure Tgetcol.WMEraseBkng(var MSg:TWMEraseBkgnd);
begin
Msg.Result:=1;
end;procedure Tgetcol.FormClick(Sender: TObject);
var t : tcolor;
r,g,b : byte;
begin
t := canvas.pixels[tx,ty];
r := getRvalue(t);
g := getGvalue(t);
B := getBvalue(t);
LABEL2.COLOR := T;
LABEL1.CAPTION := '$00' + HEXB(R) + HEXB(G) + HEXB(B);
end;procedure Tgetcol.FormMouseMove(Sender: TObject; Shift: TShiftState; X,
Y: Integer);
begin
tx := x;
ty := y;
end;procedure Tgetcol.Panel1Click(Sender: TObject);
begin
CLOSE;
end;procedure Tgetcol.FormDblClick(Sender: TObject);
begin
close;
end;procedure Tgetcol.FormResize(Sender: TObject);
begin
panel1.top := height - panel1.height -1;
panel1.left := width - panel1.width -1;
panel1.visible := true;
end;end.
==========================
program Getcolor;uses
Forms,
Ugetcor in 'UGETCOR.PAS' {getcol};{$R *.RES}begin
Application.CreateForm(Tgetcol, getcol);
Application.Run;
end.
==========================
object getcol: Tgetcol
Left = 376
Top = 191
BorderStyle = bsNone
Caption = 'getcol'
ClientHeight = 128
ClientWidth = 274
Color = clBtnFace
Font.Charset = DEFAULT_CHARSET
Font.Color = clWindowText
Font.Height = -14
Font.Name = 'System'
Font.Style = []
OldCreateOrder = True
WindowState = wsMaximized
OnClick = FormClick
OnDblClick = FormDblClick
OnMouseMove = FormMouseMove
OnResize = FormResize
PixelsPerInch = 96
TextHeight = 16
object Panel1: TPanel
Left = 96
Top = 9
Width = 146
Height = 19
TabOrder = 0
Visible = False
OnClick = Panel1Click
object Label1: TLabel
Left = 34
Top = 2
Width = 108
Height = 15
Alignment = taCenter
AutoSize = False
Color = 16777088
ParentColor = False
end
object Label2: TLabel
Left = 11
Top = 2
Width = 26
Height = 16
AutoSize = False
Color = clBtnFace
ParentColor = False
end
end
end