如何实现半透明窗体(急!)

[Lentil]

请各路神仙指教,如何实现半透明窗体!!!

[yao_yuan]

www.ccw.com.cn的技巧中已有这样的文章，不过是delphi的，摘录如下：
unit Unit1;

interface

uses
Windows, Messages, SysUtils, Classes,
Graphics, Controls, Forms, Dialogs,
StdCtrls, ExtCtrls, Buttons;

type
TForm1 = class(TForm)
Label1: TLabel;
Shape1: TShape;
Shape2: TShape;
Shape3: TShape;
Shape4: TShape;
Image1: TImage;
SpeedButton1: TSpeedButton;
procedure FormCreate(Sender: TObject);
procedure SpeedButton1Click(Sender: TObject);
private
{ Private declarations }
//截获背景图象
function GetBackgroundBmp:TBitmap;
//对背景图象进行滤镜处理
procedure TranslucentBmp(Bmp:TBitmap;
AColor:TColor;ATransparent:Longint);
public
{ Public declarations }
end;

var
Form1: TForm1;

implementation

{$R *.DFM}
//以下截获背景图象
function TForm1.GetBackgroundBmp:TBitmap;
var Scn:TCanvas;
h,w:Integer;
begin
Scn:=TCanvas.Create; //建立整个屏幕的画布
h:=ClientHeight;//窗口的高
w:=ClientWidth; //窗口的宽
Result.Height:=h; //设返回位图的高就是窗口的高
Result.Width:=w;//设返回位图的宽就是窗口的宽
try
Scn.Handle:=GetDC(0);//取得整个屏幕的DC
//以下一行将窗口的背景部分复制到指定的画布中，
也就是本函数的返回值
Result.Canvas.CopyRect(Rect(0,0,w,h),Scn,
Rect(Left,Top,Left+w,Top+h));
ReleaseDC(0, Scn.handle);
finally
Scn.Free;
end;
end;

//以下函数对背景图象进行滤镜处理，
Bmp是要处理的位图；ATransparent是透明度
procedure TForm1.TranslucentBmp(Bmp:
TBitmap;AColor:TColor;ATransparent:Longint);
var BkColor:COLORREF;
ForeColor:Longint;
R,G,B:Int64;
i,j:Integer;
begin
ForeColor:=ColorToRGB(AColor);
with Bmp.Canvas do
for i:=ClientHeight-1 downto 0 do
for j:=ClientWidth-1 downto 0 do
begin
BkColor:=GetPixel(Handle,j,i); //取得每一象素
R:=Byte(ForeColor)+
(Byte(BkColor)-Byte(ForeColor))*ATransparent;
G:=Byte(ForeColor shr 8)+
(Byte(BkColor shr 8)-Byte(ForeColor
shr 8))*ATransparent;
B:=Byte(ForeColor shr 16)+
(Byte(BkColor shr 16)-Byte(ForeColor
shr 16))*ATransparent;
SetPixelV(Handle,j,i,RGB(R,G,B));//合成象素
end;
end;

procedure TForm1.FormCreate(Sender: TObject);
var BackgroundBmp:TBitmap;
begin
try
BackgroundBmp:=Tbitmap.Create;
//建立窗口背景图
BackgroundBmp.PixelFormat:=pf24bit;
//指定该图是24位真彩色
BackgroundBmp:=GetBackgroundBmp;
//取得窗口背景图
TranslucentBmp(BackgroundBmp,clBlack,50);
//对该图象进行滤镜处理
Image1.Picture.Bitmap:=BackgroundBmp;
//将处理过的图象显示出来
finally
BackgroundBmp.Free;
end;
end;

procedure TForm1.SpeedButton1Click
(Sender: TObject);
begin
Close;
end;

end.

[dandycheung]

在dandy.163.net中有用VC++写成的代码。

[shines77]

用Alpha 像素运算， CSDN文档中心有！
http://210.77.155.27/develop/read_article.asp?id=317

[shines77]

去他的原始站点 http://www4.netease.com/~overclock/ 更好