TEventObject & IE tabs gives fatal error
I am using this code
try
document := (pDisp as IWebbrowser2).Document AS IHTMLDocument2;
Body := Document.body;
Links := Document.links;
for i := 0 to (Links.length-1) do
begin
tmp := (Links.item(i, 0) as IHTMLElement);
tmp.onclick := TEventObject.Create(MyProcedure) as IDispatch; // THIS LINE
end;
except
on E : Exception do
ShowMessage(E.ClassName+' error raised, with message : '+E.Message);
end;
In the DocumentComplete event of an IE web browser, it works fine but when I open a new tab I get a Microsoft Internet Explorer has encountered a problem and needs to close" error.
The line marked with // THIS LINE in the code above is the one that is causing it (I commented it and it didn't show the error).
Here's the rest of the code:
TEventObject = class(TInterfacedObject, IDispatch)
private
FOnEvent: TProcedure;
protected
function GetTypeInfoCount(out Count: Integer): HResult; stdcall;
function GetTypeInfo(Index, LocaleID: Integer; out TypeInfo): HResult; stdcall;
function GetIDsOfNames(const IID: TGUID; Names:开发者_JAVA百科 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;
public
constructor Create(const OnEvent: TProcedure);
property OnEvent: TProcedure read FOnEvent write FOnEvent;
end;
...........
constructor TEventObject.Create(const OnEvent: TProcedure);
begin
inherited Create;
FOnEvent := OnEvent;
end;
function TEventObject.GetIDsOfNames(const IID: TGUID; Names: Pointer;
NameCount, LocaleID: Integer; DispIDs: Pointer): HResult;
begin
Result := E_NOTIMPL;
end;
function TEventObject.GetTypeInfo(Index, LocaleID: Integer;
out TypeInfo): HResult;
begin
Result := E_NOTIMPL;
end;
function TEventObject.GetTypeInfoCount(out Count: Integer): HResult;
begin
Result := E_NOTIMPL;
end;
function TEventObject.Invoke(DispID: Integer; const IID: TGUID;
LocaleID: Integer; Flags: Word; var Params; VarResult, ExcepInfo,
ArgErr: Pointer): HResult;
begin
if (Dispid = DISPID_VALUE) then
begin
if Assigned(FOnEvent) then
FOnEvent;
Result := S_OK;
end
else Result := E_NOTIMPL;
end;
How could I make it work for tabs?
I found a workaround:
URL := AnsiLowerCase(URL);
if (URL='') or (URL='about:blank') or (URL='about:tabs') then Exit;
The click events works ok on others pages that are not about:tabs.
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