activex怎么才能扑捉到IE关闭事件?(100分)

  • 主题发起人 robinson
  • 开始时间
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robinson

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我在项目中使用了一个自己写的activex,并在客户端保存了几个临时文件,
请问当IE直接叉掉时,activex怎么才能获得这个事件,删除保存在客户端的文件???
 
window.unload=ActiveXID.method
 
>>一生中最爱
bho是什么
 
以前在大富翁上找的,应该能解决问题。
利用Delphi编写IE扩展——响应事件(BHO)
在自己的程序中使用过webbrowser控件的朋友都知道,webbrowser控件定义了诸如beforenavigate、downloadcomplete 等事件,我们可以通过编写事件处理代码实现对webbrowser控件的操作。那么如何实现对ie的事件响应和处理呢?同建立ie面板一样。我们需要建立一个实现iobjectwithsite接口的com组件,不同的是,我们还需要实现idispatch接口,在iobjectwithsite接口的setsite方法中获得ie的webbrowser接口并建立自身与webbrowser的连接,然后如果在ie的webbrowser对象中发生什么事件的话,那么ie就会回调连接的idispatch接口的invoke方法。我们通过在invoke方法中编写代码就可以获得ie事件了。这个利用的是com编程的回调接口原理。
下面我们首先来实现代码。
1 点击delphi菜单 file | new ;
2 在 activex 页面中选择active library ,然后点击 ok 按钮;
3 然后用同样的方法建立一个com object;
4 在com object wizard 窗口中,将复选框 included type library 去掉。然后在class name中输入iehelper,在implemented interface 中输入:idispatch;iobjectwithsite 。然后点击 ok 按钮建立一个com组件。
保存工程,将工程保存为iehelper.dpr,将unit1保存为iehelperunit.pas。下面是iehelperunit.pas的具体代码:

unit iehelperunit;
interface
uses
windows, comobj, activex, shdocvw, mshtml,dialogs;
type
tiehelperfactory = class(tcomobjectfactory)
private
procedure addkeys;
procedure removekeys;
public
procedure updateregistry(register: boolean)
override;
end;

tiehelper = class(tcomobject, idispatch, iobjectwithsite)
public
function gettypeinfocount(out count: integer): hresult
stdcall;
function gettypeinfo(index, localeid: integer
out typeinfo): hresult
stdcall;
function getidsofnames(const iid: tguid
names: pointer;
namecount, localeid: integer
dispids: pointer): hresult
stdcall;
function invoke(dispid: integer
const iid: tguid
localeid: integer;
flags: word
var params
varresult, excepinfo, argerr: pointer): hresult
stdcall;
function setsite(const punksite: iunknown): hresult
stdcall;
function getsite(const riid: tiid
out site: iunknown): hresult
stdcall;
private
ie: iwebbrowser2;
cookie: integer;
end;

const
class_iehelper: tguid = '{3d898c55-74cc-4b7c-b5f1-45913f368388}';

implementation
uses comserv, registry, sysutils;

procedure dostatustextchange(const text: widestring);
begin
end;

procedure doprogresschange(progress: integer
progressmax: integer);
begin
end;

procedure docommandstatechange(command: integer
enable: wordbool);
begin
end;

procedure dodownloadbegin;
begin
end;

procedure dodownloadcomplete;
begin
end;

procedure dotitlechange(const text: widestring);
begin
end;

procedure dopropertychange(const szproperty: widestring);
begin
end;

procedure dobeforenavigate2(const pdisp: idispatch
var url: olevariant;
var flags: olevariant
var targetframename: olevariant;
var postdata: olevariant
var headers: olevariant
var cancel: wordbool);
begin
if url<> 'http://www.applevb.com/'then begin
showmessage('你不可以浏览其它站点');
cancel:=true;
url:='http://www.applevb.com';
(pdisp as iwebbrowser2).navigate2(url,flags,targetframename,postdata,headers);
end;
end;

procedure donewwindow2(var ppdisp: idispatch
var cancel: wordbool);
begin
end;

procedure donavigatecomplete2(const pdisp: idispatch
var url: olevariant);
begin
end;

procedure dodocumentcomplete(const pdisp: idispatch
var url: olevariant);
begin
end;

procedure doonquit;
begin
end;

procedure doonvisible(visible: wordbool);
begin
end;

procedure doontoolbar(toolbar: wordbool);
begin
end;

procedure doonmenubar(menubar: wordbool);
begin
end;

procedure doonstatusbar(statusbar: wordbool);
begin

end;

procedure doonfullscreen(fullscreen: wordbool);
begin
end;

procedure doontheatermode(theatermode: wordbool);
begin
end;


procedure buildpositionaldispids(pdispids: pdispidlist
const dps: tdispparams);
var
i: integer;
begin
assert(pdispids <> nil);
for i := 0 to dps.cargs - 1 do pdispids^ := dps.cargs - 1 - i;
if (dps.cnamedargs < = 0) then exit;
for i := 0 to dps.cnamedargs - 1 do pdispids^[dps.rgdispidnamedargs^] := i;
end;

function tiehelper.invoke(dispid: integer
const iid: tguid
localeid: integer;
flags: word
var params
varresult, excepinfo, argerr: pointer): hresult;
type
polevariant = ^olevariant;
var
dps: tdispparams absolute params;
bhasparams: boolean;
pdispids: pdispidlist;
idispidssize: integer;
begin
result := disp_e_membernotfound;
pdispids := nil;
idispidssize := 0;
bhasparams := (dps.cargs > 0);
if (bhasparams) then
begin
idispidssize := dps.cargs * sizeof(tdispid);
getmem(pdispids, idispidssize);
end;
try
if (bhasparams) then buildpositionaldispids(pdispids, dps);
case dispid of
102:
begin
dostatustextchange(dps.rgvarg^[pdispids^[0]].bstrval);
result := s_ok;
end;
108:
begin
doprogresschange(dps.rgvarg^[pdispids^[0]].lval, dps.rgvarg^[pdispids^[1]].lval);
result := s_ok;
end;
105:
begin
docommandstatechange( dps.rgvarg^[pdispids^[0]].lval,
dps.rgvarg^[pdispids^[1]].vbool);
result := s_ok;
end;
106:
begin
dodownloadbegin();
result := s_ok;
end;
104:
begin
dodownloadcomplete();
result := s_ok;
end;
113:
begin
dotitlechange(dps.rgvarg^[pdispids^[0]].bstrval);
result := s_ok;
end;
112:
begin
dopropertychange(dps.rgvarg^[pdispids^[0]].bstrval);
result := s_ok;
end;
250:
begin
dobeforenavigate2(idispatch(
dps.rgvarg^[pdispids^[0]].dispval),
polevariant(dps.rgvarg^[pdispids^[1]].pvarval)^, polevariant(dps.rgvarg^[pdispids^[2]].pvarval)^,
polevariant(dps.rgvarg^[pdispids^[3]].pvarval)^,
polevariant(dps.rgvarg^[pdispids^[4]].pvarval)^,
polevariant(dps.rgvarg^[pdispids^[5]].pvarval)^,
dps.rgvarg^[pdispids^[6]].pbool^);
result := s_ok;
end;
251:
begin
donewwindow2(idispatch(dps.rgvarg^[pdispids^[0]].pdispval^),
dps.rgvarg^[pdispids^[1]].pbool^);
result := s_ok;
end;
252:
begin
donavigatecomplete2( idispatch(dps.rgvarg^[pdispids^[0]].dispval),
polevariant(dps.rgvarg^[pdispids^[1]].pvarval)^);
result := s_ok;
end;
259:
begin
dodocumentcomplete(idispatch(dps.rgvarg^[pdispids^[0]].dispval),
polevariant(dps.rgvarg^[pdispids^[1]].pvarval)^);
result := s_ok;
end;
253:
begin
doonquit();
result := s_ok;
end;
254:
begin
doonvisible(dps.rgvarg^[pdispids^[0]].vbool);
result := s_ok;
end;
255:
begin
doontoolbar(dps.rgvarg^[pdispids^[0]].vbool);
result := s_ok;
end;
256:
begin
doonmenubar(dps.rgvarg^[pdispids^[0]].vbool);
result := s_ok;
end;
257:
begin
doonstatusbar(dps.rgvarg^[pdispids^[0]].vbool);
result := s_ok;
end;
258:
begin
doonfullscreen(dps.rgvarg^[pdispids^[0]].vbool);
result := s_ok;
end;
260:
begin
doontheatermode(dps.rgvarg^[pdispids^[0]].vbool);
result := s_ok;
end;
end;
finally
if (bhasparams) then freemem(pdispids, idispidssize);
end;
end;


function tiehelper.getidsofnames(const iid: tguid
names: pointer;
namecount, localeid: integer
dispids: pointer): hresult;
begin
result := e_notimpl;
end;

function tiehelper.gettypeinfo(index, localeid: integer;
out typeinfo): hresult;
begin
result := e_notimpl;
pointer(typeinfo) := nil;
end;

function tiehelper.gettypeinfocount(out count: integer): hresult;
begin
result := e_notimpl;
count := 0;
end;


function tiehelper.getsite(const riid: tiid
out site: iunknown): hresult;
begin
// result := s_ok;
if assigned(ie) then result:=ie.queryinterface(riid, site)
else
result:= e_fail;
end;

function tiehelper.setsite(const punksite: iunknown): hresult;
var
cmdtarget: iolecommandtarget;
sp: iserviceprovider;
cpc: iconnectionpointcontainer;
cp: iconnectionpoint;
begin
if assigned(punksite) then begin
cmdtarget := punksite as iolecommandtarget;
sp := cmdtarget as iserviceprovider;
if assigned(sp)then sp.queryservice(iwebbrowserapp, iwebbrowser2, ie);
if assigned(ie) then begin
ie.queryinterface(iconnectionpointcontainer, cpc);
cpc.findconnectionpoint(dwebbrowserevents2, cp);
cp.advise(self, cookie)
end;
end;
result := s_ok;
end;


procedure tiehelperfactory.addkeys;
var s: string;
begin
s := guidtostring(class_iehelper);
with tregistry.create do
try
rootkey := hkey_local_machine;
if openkey('software/microsoft/windows/currentversion/explorer/browser helper objects/'
+ s, true) then closekey;
finally
free;
end;
end;

procedure tiehelperfactory.removekeys;
var s: string;
begin
s := guidtostring(class_iehelper);
with tregistry.create do
try
rootkey := hkey_local_machine;
deletekey('software/microsoft/windows/currentversion/explorer/browser helper objects/' + s);
finally
free;
end;
end;

procedure tiehelperfactory.updateregistry(register: boolean);
begin
inherited updateregistry(register);
if register then addkeys else removekeys;
end;

initialization
tiehelperfactory.create(comserver, tiehelper, class_iehelper,
'iehelper', '', cimultiinstance, tmapartment);
end.

代码很长,但是关键的是tiehelper.setsite方法以及tiehelper.invoke方法。在tiehelper.setsite方法中注意以下语句:
if assigned(sp)then
sp.queryservice(iwebbrowserapp, iwebbrowser2, ie);
if assigned(ie) then begin
ie.queryinterface(iconnectionpointcontainer, cpc);
cpc.findconnectionpoint(dwebbrowserevents2, cp);
cp.advise(self, cookie)

上面的语句作用是,首先获得ie的webbrowser接口,然后寻找到连接点。并通过advise方法建立com自身与连接点的连接。
当连接建立成功后,ie在有事件引发后,会调用连接到自身的idispatch接口对象的invoke方法。不同的事件对应不同的dispid编码,我们可以在程序中判断dispid并做相应的处理。在上面的程序中,我们只处理了beforenavigate2 事件,处理函数是dobeforenavigate2,在该函数中,如果浏览的站点不是'http://www.applevb.com/'的话,程序会提示:'你不可以浏览其它站点'并强行转到http://www.applevb.com。
很多的软件,象“护花使者”以及“3721”一类的中文网址”都是利用上面的原理来实现对ie浏览器事件响应的,例如3721,当用户输入一个中文词并浏览时,com组件可以在beforenavigate2 事件中编写代码访问服务器并转到正确的站点上去。
 
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