Is this safe? (map) - COM Discussion Boards

Re: installation and DLL?

16-Sep-03 22:39

Since this is a cutom toolbar, you can handle RButtonDown notification, and then create a CMenu object, and use LoadMenu and TrackPopupMenu methods to display it.

"A robust program is resistant to errors -- it either works correctly, or it does not work at all; whereas a fault tolerant program must actually recover from errors."

installation and DLL?

Maverick13-Sep-03 1:05

Maverick

13-Sep-03 1:05

Hey i'm making a COM dll using the ATL appwizard and... the COM dll is set support MFC...

The COM dll is used by a VB application... NOw i want to make an installation or setup so that my application is run in other computers without Visual C++...

How do i do these? What DLL's would i have to include in my installation... how about MFC dll's?

I tried installing the applicationsin other computers but there's an error saying that some DLL failed to register... I'm thinking i did not include other dll's that is needed by the application itself or the DLL that was included already.. what is it? i didn't use other third party libraries so i'm sure maybe its just the MFC dlls.. what is it?

"its all right, the gun isn't loaded" - hey

Jagadeesh VN16-Sep-03 22:43

IOleCommandTarget Impleimentation

16-Sep-03 22:43

What you can do is, link the MFC Dll statically to your COM dll. Then you only need to distribute your COM dll, and dont forget to register your dll before using it from VB.
Registration can be done using 'Regsvr32' command. OR if you are using some installation pgms, then there will be some APIs for doing the same.

"A robust program is resistant to errors -- it either works correctly, or it does not work at all; whereas a fault tolerant program must actually recover from errors."

suri babu12-Sep-03 5:16

suri babu

12-Sep-03 5:16

I added a toolbar button to IE, which is connected to a BHO object.
I implemented IOleCommandTarget and IObjectWithSite interfaces. the problem is once i click on the toolbar it is invokes IOleCommandTarget ::Exec, and disables the toolbar button. How do u stop this behaviour.. can any body help me

Is this safe? (map)

Jeremy Pullicino11-Sep-03 3:45

Jeremy Pullicino

11-Sep-03 3:45

Is the following safe?

{<br />
    map<<CComBSTR, CComBSTR>> mp;<br />
<br />
    {<br />
        CComBSTR& bstrNew = mp[L"1"];<br />
<br />
        bstrNew = "Hello";<br />
    }<br />
<br />
    wprintf(mp[L"1"]);<br />
}

Will bstrNew get destroyed, thus invalidating the "Hello" string?

Jeremy Pullicino
C++ Developer

Homepage

Using ActiveX

daphna10-Sep-03 4:21

daphna

10-Sep-03 4:21

I'm considering building an ActiveX control.
I would like to know which consideration I should take into account.
The application which is going to use the activeX control is a multi-threaded, it contains many features and might be big.
Does ActiveX slow down the system? are there problem with threaded?
What are the advantages and disadvantages of ActiveX? Should I write a java applet, or an MFC dll instead?

Thanks Dafna.

Re: Using ActiveX

Jagadeesh VN10-Sep-03 9:44

_bstr_t::copy and memory leak?

10-Sep-03 9:44

If you are not confident, that your control is thread-safe, always put it in an STA( Single Threaded Apartment ), so that only one thread can access it, and select the threading model as Apartment.

ActiveX unlike, VBX controls has got independent existence, irrespective of the language used. They are actually built on top of COM standards, and has got several adavntages as well, refer MSDN for more details. Disadvantages can be there unless otherwise not properly implemented.

Java Applet / MFC DLL ?? - Depends on the scenario.

"A robust program is resistant to errors -- it either works correctly, or it does not work at all; whereas a fault tolerant program must actually recover from errors."

Maverick9-Sep-03 22:56

Maverick

9-Sep-03 22:56

consider the following code:

<br />
STDMETHODIMP CmyComObject::get_Address(BSTR *pVal)<br />
{<br />
  // TODO: Add your implementation code here<br />
  *pVal = m_sAddress.copy();<br />
<br />
   return S_OK;<br />
}<br />
//m_sAddress is of type _bstr_t<br />

i'm using this Com object in a Visual Basic Program... Now when i keep on calling this function many times, does my program goes to a memory leak?, or does visual basic frees the copies automatically? or should i manually free the strings first before making another copy?

i also got this in a .net examples on bstr::copy()..

"its all right the gun isn't loaded" - hey

Jagadeesh VN9-Sep-03 23:27

9-Sep-03 23:27

Visual Basic is not going to do that for you, Its your responsibility to free it.

"A robust program is resistant to errors -- it either works correctly, or it does not work at all; whereas a fault tolerant program must actually recover from errors."

Steve S11-Sep-03 1:58

Steve S

11-Sep-03 1:58

Nope, guess again. VB is calling this code, and it will manage the returned BSTR, disposing of it as appropriate. If it was VC++, then the caller would manage the returned string. VB, as caller, is doing that, and the fragment is fine.

You need to return a copy of the string because the ORIGINAL still belongs to the interface implementation (or object).

Steve S

Maverick11-Sep-03 22:06

Maverick

11-Sep-03 22:06

thanks man!!!

asp to asp.net with com problem

doisy18-Sep-03 3:01

doisy

18-Sep-03 3:01

You mean that i need not to release and do nothing,
This situation will not go to a memory leak? D'Oh! | :doh:

"You need to return a copy of the string because the ORIGINAL still belongs to the interface implementation (or object)."
What does this mean?

Hello everyone

mark2229-Sep-03 22:44

mark222

9-Sep-03 22:44

hi i have buy.asp page i want to make new like it in asp.net with c#:
this is my buy.asp

<% Dim MyObj

Set MyObj = Server.CreateObject("e24PaymentPipe.e24PaymentPipe.1")

MyObj.WebAddress = "e24cert.beeebank.com/burgan"

MyObj.PortStr = "443"

MyObj.ID = "9999"

MyObj.Password = "9091"

MyObj.Action = "1"

MyObj.Cardtype = "DEBIT"

MyObj.Amt = Session("Amount")

MyObj.ResponseURL="https://localhost/response.asp"

MyObj.TrackId = "111111"

MyObj.Udf1 = "UDF1"

MyObj.Udf2 = "UDF2"

MyObj.Udf3 = "UDF3"

MyObj.Udf4 = "UDF4"

MyObj.Udf5 = "UDF5"

Dim PaymentURL,PaymentID

Dim varRawResponse,varErrorMsg

TransVal = MyObj.PerformTransaction 'returns 0 for succes -1 for failure

varRawResponse = MyObj.RawResponse

PaymentURL = MyObj.PaymentPage

'PaymentID = MyObj.PaymentId

Response.Write("" )

%>

this asp page use an activex dll
now in my asp.net i add referance to this dll after regesterd in windows (is it enugh to use in .net ?)
and i tried to convert moc.asp to asp.net one (in c#) as the following:

e24PaymentPipeLib.e24PaymentPipeCtlClass s = new e24PaymentPipeLib.e24PaymentPipeCtlClass();

s.WebAddress = "e24cert.beeebank.com/burgan";

s.PortStr = "443";

s.ID = "9999";

s.Password = "9091";

s.Action = "1";

s.Cardtype = "DEBIT";

s.Amt = "10.000"; // as try

s.ResponseUrl = "https://localhost/response.aspx";

s.TrackId = "111111";

s.Udf1 = "UDF1";

s.Udf2 = "UDF2";

s.Udf3 = "UDF3";

s.Udf4 = "UDF4";

s.Udf5 = "UDF5";

short x = s.PerformTransaction();

Label3.Text = x.ToString() ;

string PaymentURL,PaymentID,varRawResponse,varErrorMsg;

varRawResponse = s.RawResponse;

PaymentURL = s.PaymentPage;

PaymentID = "49876255444";

varErrorMsg = s.ErrorMsg;

Label8.Text = varErrorMsg;

Response.Write("" ) ;

but it still not working

note: if you looking to :

Response.Write("" ) ;

the PaymentURL give me my page not the Payment page

please help me thanks all
mark

Forward declaration of interfaces

Rowan Seymour9-Sep-03 2:30

9-Sep-03 2:30

I have 2 interfaces that reference each other (A & B) and the MIDL compiler is not happy... Frown | :-(

in A's header file...

__interface IA : IDispatch<br />
{<br />
  [id(1), helpstring("")] HRESULT func([in] IB* pB);<br />
};

in B's header file...

__interface IB : IDispatch<br />
{<br />
  [id(1), helpstring("")] HRESULT func([in] IB* pB);<br />
};

if i don't forward declare the interfaces I get a C++ syntax error

if i forward declare the interfaces with the __interface keyword, I get:

error MIDL2025 : syntax error : expecting a type specification near "IImageHSV"

if i forward declare the interfaces with the interface keyword, I get:

error MIDL2003 : redefinition : IImageHSV

Any suggestions much appreciated

valikac9-Sep-03 5:53

valikac

9-Sep-03 5:53

Try using a different ID.

Kuphryn

Rowan Seymour10-Sep-03 6:11

10-Sep-03 6:11

You mean a different GUID? Can a forward declaration have a GUID? Don't think so...
Why isn't everyone having this problem Big Grin | :-D

Brian Shifrin11-Sep-03 1:35

Brian Shifrin

11-Sep-03 1:35

I do that all the time

[uuid(...
]
library MyCoolLib
{
interface IB;

[ object, uuid(...),dual...]
interface IA : IDispatch
{
[id(1), helpstring("")] HRESULT func([in] IB* pB);
};

[ object, uuid(...),dual...]
interface IB : IDispatch
{
[id(1), helpstring("")] HRESULT func([in] IA* pB);
};

Rowan Seymour11-Sep-03 3:34

11-Sep-03 3:34

I'm using the ATL Wizard in VS.NET which puts the IDL and C++ in the same file, so I have to use the __interface keyword, which I think is the problem because the MIDL compiler doesn't recognize the forward declaration using __interface. Maybe. Arrghh. Smile | :)

arun140529-Oct-03 2:18

arun1405

29-Oct-03 2:18

I am facing the same problem and have not able to find out any solution yet. I tried inserting interface declaration statements in IDL file using "cpp_quote" attribute also but that does not work even (it inserts the line including "cpp_quote" Frown | :(

Rowan, have you been able to find out any solution yet. If you had already, do post it... it would be a great help !

Thanx & Regards,
Arun.

Rowan Seymour29-Oct-03 2:58