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Tips &
Tricks
1. Change Caption and Icon in Webbrowser's
default Dialog-boxes

You can change the content of the caption-bar in
TWebbrowsers built-in dialog-boxes. The following sample shows how
to replace "Microsoft Internet Explorer" or "Internet
Explorer" with the title and icon defined for your project:
Add to private section in
your main form:
procedure WMActivate(var Msg:
TWMActivate); message WM_ACTIVATE;
Procedure TForm1.WMActivate(var
Msg: TWMActivate);
var
S: String;
wnd: HWND;
I: Integer;
begin
If Msg.Active=0 then
begin
wnd := Msg.ActiveWindow;
SendMessage(wnd, WM_SETICON, ICON_SMALL,
Application.Icon.Handle);
I := GetWindowTextLength(wnd);
SetLength(S, I + 1);
GetWindowText(Wnd, PChar(S), I + 1);
S := StringReplace(S, 'Microsoft ', '', []);
S := StringReplace(S, 'Internet Explorer',
Application.Title, []);
SetWindowText(Wnd, Pchar(S));
end;
end;
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2. Disable built-in Dialog-boxes.
It is not always a good idea to use Silent-property
to prevent 'Internet Explorer Script Error'-dialogs and other
standard messageboxes from showing up. Instead you can use the
following solution. To disable all 'Internet Explorer' messageboxes:
Add to private section in
your main form:
procedure WMActivate(var Msg:
TWMActivate); message WM_ACTIVATE;
procedure TForm1.WMActivate(var
Msg: TWMActivate);
var
S: String;
wnd: HWND;
I: Integer;
begin
If Msg.Active=0 then
begin
wnd := Msg.ActiveWindow;
I := GetWindowTextLength(wnd);
SetLength(S, I + 1);
GetWindowText(Wnd, PChar(S), I + 1);
If Pos('Internet Explorer', S)>0 then
Sendmessage(wnd,WM_CLOSE,0,0);
end;
end;
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3. Keep Contextmenu but disable "View Source"
You do not need to remove the right-click
context-menu if you only want to disable "View Source".
Add the following key to the registry:
HKEY_LOCAL_MACHINE\Software\Microsoft\Internet
Explorer\View Source Editor\Editor Name
Set Value of 'Editor Name' to an exe-file, that does
nothing but shows a messagebox: "View Source is not available".
4. Set Print-Options programmatically. (Version 1)
The following sample shows an easy way to programmatically set
options for print (number of copies, paper orientation, header,
footer, margins etc.). The program opens the Pagesetup and Print
dialogs, makes the modifications and close them again before they
become visible. You can use the functions EnumChildWindows
and GetCtrlId to get the ControlID for other options you want
to set programmatically.
Add to private section in
your main form:
procedure WMActivate(var Msg:
TWMActivate); message WM_ACTIVATE;
type
TPrintOptions = record
Copies: Integer; //Number of
copies
Portrait: Boolean; //Paper orientation
Left: string;
//Left Margin
Top: string;
//Top Margin
Right: string; //Right
Margin
Bottom: string; //Bottom Margin
Header: string; //Header string
Footer: string; //Footer string
end;
var
PrintOptions: TPrintOptions;
PrintWithOptions: Boolean;
procedure TForm1.WMActivate(var Msg:
TWMActivate);
var
S: string;
h, wnd: HWND;
Item, I: Integer;
begin
if PrintWithOptions and (msg.active = 0) then
begin
PrintWithOptions := false;
wnd := Msg.ActiveWindow;
I := GetWindowTextLength(wnd);
SetLength(S, I + 1);
GetWindowText(Wnd, PChar(S), I + 1);
if S = 'Print'#0 then begin
SetDlgItemInt(wnd, 1154,
PrintOptions.Copies, FALSE);
SendDlgItemMessage(Wnd, 1, BM_CLICK, 0,
0);
PrintWithOptions := true;
end else
if S = 'Page Setup'#0 then begin
if PrintOptions.Portrait then
SendDlgItemMessage(Wnd, 1056, BM_CLICK,
0, 0)
else
SendDlgItemMessage(Wnd, 1057, BM_CLICK,
0, 0);
SetDlgItemText(wnd, 8147,
PChar(PrintOptions.Header));
SetDlgItemText(wnd, 8149,
PChar(PrintOptions.Footer));
SetDlgItemText(wnd, 1155,
PChar(PrintOptions.Left));
SetDlgItemText(wnd, 1156,
PChar(PrintOptions.Top));
SetDlgItemText(wnd, 1157,
PChar(PrintOptions.Right));
SetDlgItemText(wnd, 1158,
PChar(PrintOptions.Bottom));
SendDlgItemMessage(Wnd, 1, BM_CLICK, 0,
0);
PrintWithOptions := true;
end;
end;
end;
procedure TForm1.Button1Click(Sender: TObject);
begin
if Assigned(EmbeddedWB1.Document) then begin
with PrintOptions do begin
Copies := 2;
Portrait := FALSE;
Footer := 'This is my Footer';
Header := 'This is my Header';
Left := '25,0';
Top := '20,0';
Right := '22,0';
Bottom := '19,7';
end;
PrintWithOptions := True;
Embeddedwb1.pagesetup;
embeddedwb1.printsetup;
PrintWithOptions := False;
end else showmessage('No Document to print!');
end;
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5. Set Print-Options programmatically. (Version
2)
You can specify extended printing information by passing in the
SAFEARRAY structure through the VARIANT argument vaIn, when you use
ExecWB and OLECMDID_PRINT. This SAFEARRAY data type takes a maximum
of five items:
- A string (BSTR) that contains a custom header.
- A string (BSTR) that contains a custom footer.
- An IStream object that contains an HTML file that serves as an
"optional header." This is the e-mail header that you
see in Microsoft Outlook and Microsoft Outlook Express e-mail
messages when you print them. This IStream must point to a full,
valid HTML document, not HTML fragments, or it will print
incorrectly.
- An alternative URL to use for the document. This is only
relevant to Outlook and Outlook Express.
- A set of printing flags (dwFlags) to configure the printer.
This is only relevant to Outlook and Outlook Express.
All versions of Internet Explorer, from version 4.0
onward, support the use of the IWebBrowser2::ExecWB method to
customize headers and footers:
procedure TForm1.PrintHeaderFooter(Header, Footer, HTMLHeader: string);
var
CmdTarget: IOleCommandTarget;
Stream: IStream;
v, v1: OleVariant;
Dummy: Int64;
Psa: PSafeArray;
begin
CreateStreamOnHGlobal(0, TRUE, Stream);
Stream.Write(Pchar(HTMLHeader), length(HTMLHeader), @Dummy);
Stream.Seek(0, STREAM_SEEK_SET, Dummy);
SafeArrayCopy(PSafeArray(TVarData(VarArrayOf([Header, Footer, Stream as IUnknown])).VArray), psa);
TVarData(V1).VType := varArray or varByRef;
SafeArrayCopy(psa, PSafeArray(TVarData(V1).VArray));
if Webbrowser1.Document <> nil then
try
Webbrowser1.Document.QueryInterface(IOleCommandTarget, CmdTarget);
if CmdTarget <> nil then
try
CmdTarget.Exec(nil, OLECMDID_PRINT, OLECMDEXECOPT_DONTPROMPTUSER, v1, v);
finally
CmdTarget := nil;
end;
except end;
end;
procedure TForm1.Button1Click(Sender: TObject);
var
HTMLHeader: string;
begin
HTMLHeader := '<HTML><BODY><FONT SIZE=4><B><CENTER>IE & DELPHI</CENTER></B></FONT><HR></BODY></HTML>';
PrintHeaderFooter('My Header', 'My Footer', HTMLHeader);
end;
procedure TForm1.FormShow(Sender: TObject);
begin
webbrowser1.navigate('about:blank');
end;
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More Info: HOWTO:
Print Custom Headers and Footers for a WebBrowser Control
6. Create EmbeddedWB dynamically
procedure TForm1.Button1Click(Sender: TObject);
var
WB: TEmbeddedWB;
begin
WB := TEmbeddedWB.Create(nil);
TControl(WB).Parent := panel1; //or whatever...
Wb.Align:=alClient;
WB.Loaded;
WB.Visible := True;
end;
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