delphi - How to render WebBrowser to device context? -


i want render web-page (i.e. twebbrowser) device context. want use internet explorer's layout engine render content device context (i.e. metafile, pdf metafile).

starting internet explorer 9 ihtmlelementrender interface no longer supported:

ihtmlelementrender interface

use interface draw contents of element specified device context, printer.

members
ihtmlelementrender interface inherits iunknown interface not have additional members.

to point no longer mention drawtodc method exists:

ihtmlelementrender::drawtodc method

deprecated. draws contents of element specified device context.

syntax

hresult drawtodc(      hdc hdc );

parameters

  • hdc
    [in] hdc specifying device drawn to, typically printer.

return value

returns s_ok if successful, or error value otherwise.

remarks

as of windows internet explorer 9, method deprecated , should not used.

with printers, running ihtmlelementrender::drawtodc may cause problems. can ensure ihtmlelementrender::drawtodc works on printers running ihtmlelementrender::setdocumentprinter method first, , passing modified device context ihtmlelementrender::drawtodc.

note: i'm quoting documentation can still found when microsoft removes msdn altogether. along interface declaration:

ihtmlelementrender = interface(iunknown)    ['{3050f669-98b5-11cf-bb82-00aa00bdce0b}']    function drawtodc(hdc: hdc): hresult; stdcall;    function setdocumentprinter(const bstrprintername: widestring; hdc: hdc): hresult; stdcall; end;

use iviewobject interface

i've tried converting use iviewobject (e.g. how render html element without using web browser?):

procedure renderwebbrowsertometafile(browser: twebbrowser; metafilename: string); var     view: iviewobject;     m: tmetafile;     mc: tmetafilecanvas;     w, h: integer;     r: trect;     dpix: integer;     dpiy: integer;     dc: hdc; begin     w := webbrowserscrollwidth(browser);     h := webbrowserscrollheightstrict(browser);      //96dpi screen 300dpi metafile (destined printer)     dc := getdc(0);     try         dpix := getdevicecaps(getdc(0), logpixelsx);         dpiy := getdevicecaps(getdc(0), logpixelsy);             releasedc(0, dc);     end;     w := muldiv(w, 300, dpix);     h := muldiv(h, 300, dpiy);      view := browser.document iviewobject;      m := tmetafile.create;     try         m.width := w;         m.height := h;         r := rect(0, 0, w, h);          mc := tmetafilecanvas.create(m, 0);         try             view.draw(                     dvaspect_content, //draw aspect                     1, //index                     nil, //paspectinfo                     nil, //pdvtargetdevice                     0, //target device context                     mc.handle, //hdcdraw                     @r, //target bounds                     @w, //window bounds (for metafiles)                     nil, //continue function                     0); //continue value                     mc.free;         end;         m.savetofile(metafilename);             m.free;     end; end;

the problem code renders visible area of browser (i.e. without scrolled content):

i need render entire web-page (e.g. printing).

i tried changing draw aspect dvaspect_content (as this example does), dvaspect_docprint:

dvaspect_docprint
provides representation of object on screen though printed printer using print command file menu. described data may represent sequence of pages.

with same result; rather rendering page, visible portion rendered:

how can ask ie9 rendering engine render?

i tried using different indexes along dvaspect_docprint. although iviewobject not documented, maybe that's how print different "pages":

view.draw(dvaspect_docprint, 1, ...); view.draw(dvaspect_docprint, 2, ...); view.draw(dvaspect_docprint, 3, ...); ... view.draw(dvaspect_docprint, n, ...);

but webbrowser doesn't care index is; rendering current view (which suppose makes sense when using iviewobject).

how render browser device context?

note: question tagged delphi, there's nothing in question delphi specific.

update: tried other combinations of aspect , index:

view.draw(dvaspect_content, -1, ...); view.draw(dvaspect_docprint, -1, ...); view.draw(dvaspect_content, 0, ...); view.draw(dvaspect_docprint, 0, ...);

using iviewobject, can create screenshot of current viewport. use trick create screenshot of web page (without frames) or frame document.

  1. calculate full document size using scrollwidth/scrollheight/scrollleft/scrolltop (check ihtmldocument2 , ihtmldocument3 interfaces)
  2. lock window update , adjust document calculated full size
  3. use iviewobject create snapshot (your code above seems okay)
  4. restore document original size , unlock window update

note that should careful of doing when document extremely large.


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