把整个网页保存成JPG图片(针对单框架网页)

procedure TForm1.Button1Click(Sender: TObject); 
var 
Doc: IHTMLDocument2; 
ViewObject: IViewObject; 
sourceDrawRect: TRect; 
a, getjpg: TBitMap; 
i, m: integer; 
pdest, psour: hbitmap; 
jpg: tjpegimage; 
begin 
Doc := WebBrowser.Document as IHTMLDocument2; 
if Webbrowser.Document <> nil then 
try 
webbrowser.Document.QueryInterface(IViewObject, ViewObject); 
if ViewObject <> nil then 
try 
Doc.Get_ParentWindow.Scroll(0, 0); //跳到网页头 
getjpg := TBitMap.Create(); 
getjpg.PixelFormat := pf24bit; 
getjpg.Height := doc.Body.getAttribute('scrollHeight', 0); 
getjpg.Width := doc.Body.getAttribute('scrollwidth', 0); 
pdest := getjpg.Canvas.Handle; 
m := Trunc(doc.Body.getAttribute('ScrollHeight', 0) / (doc.Body.getAttribute('offsetHeight', 0) - 20)); 
i := Trunc(doc.Body.getAttribute('Scrollwidth', 0) / (doc.Body.getAttribute('offsetwidth', 0) - 20)); 
for i := 0 to i do 
begin 
for m := 0 to m 1 do 
begin 
a := TBitMap.Create(); 
a.Height := doc.Body.getAttribute('offsetHeight', 0); 
a.Width := doc.Body.getAttribute('offsetwidth', 0); 
psour := a.Canvas.handle; 
sourceDrawRect := Rect(0, 0, a.Width, a.Height); 
ViewObject.Draw(DVASPECT_CONTENT, 1, nil, nil, Self.Handle, a.Canvas.Handle, @sourceDrawRect, nil, nil, 0); 
bitblt(pdest, doc.Body.getAttribute('scrollLeft', 0), doc.Body.getAttribute('Scrolltop', 0), a.Width, a.Height, psour, 2, 2, srccopy); 
Doc.Get_ParentWindow.Scroll(doc.Body.getAttribute('scrollLeft', 0), doc.Body.getAttribute('offsetHeight', 0) doc.Body.getAttribute('Scrolltop', 0) - GetSystemMetrics(SM_CXVSCROLL) - 24); 
a.Free; 
end; 
Doc.Get_ParentWindow.Scroll(doc.Body.getAttribute('offsetwidth', 0) doc.Body.getAttribute('scrollLeft', 0) - GetSystemMetrics(SM_CXVSCROLL) - 24, 0); 
end; 
jpg := tjpegimage.Create; 
jpg.Assign(getjpg); 
getjpg.Free; 
jpg.SaveToFile('c:\test.jpg'); 
jpg.Free; 
finally 
ViewObject._Release; 
end; 
except 
end; 
end;