ATL / WTL / STL

18-Apr-04 15:28

Ive just finished coding a graphics active X control and I wanted do drop it straight into a visual basic application iam working on, but for some reason all of the properties that ive added to me control (such as position angle etc) dont appear in the properties editor in VB. Do I need to create a property page or do something in order for this to happen. As I can happily change my control properties in a VBsciptlet in a HTML page so why not VB???

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Mike Dimmick19-Apr-04 8:45

19-Apr-04 8:45

If they're marked correctly in the IDL file (the Get method is marked propget, the Set method propput or propputref and both have the same dispid) and the interface is marked default, they should have appeared in VB's Properties page.

If you want to do extended property handling, such as categorisation, see the following MSJ article: http://www.microsoft.com/msj/0399/atl3activex2/atl3activex2.aspx[^].

Stability. What an interesting concept. -- Chris Maunder

mikewithersone19-Apr-04 14:30

19-Apr-04 14:30

I have the properties marked correctly such as:
[propget, id(1), helpstring("property angleX")] HRESULT angleX([out, retval] double *pVal);
[propput, id(1), helpstring("property angleX")] HRESULT angleX([in] double newVal);

Where is the interface supposed to marked as default? And how is this done in code?

Is it something like this?
[default] interface Iviewer;

Also in visual basic ive noticed that when I goto add my control to the tool bar i have the options of either adding my control as a "Control" or a "insertable object". When I add it as a control it crashes upon use? Whichs should be using because it appears one is defintaley differant to the other?
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Mike Dimmick20-Apr-04 8:24

20-Apr-04 8:24

You mark the default interface in the coclass statement in the IDL file, using the [default] attribute. Visual Basic can use non-default interfaces (unlike scripting clients) but will only show the properties on the default interface.

You should be adding your control as a control. "Insertable object" is for Active Documents, such as inserting a Word document into your project. You can debug the interaction with Visual Basic by setting VB6.EXE as the executable to debug in Project Settings.

Stability. What an interesting concept. -- Chris Maunder

mikewithersone20-Apr-04 9:26

How to get key-down message in a WTL combobox?

20-Apr-04 9:26

I have this done, but iam still with out success? The properties just dont appear $Shucks | :-\$ . It does appear I can either add the control as "viewer.class" (Which is the name of the control) or 3Dviewer.dll (which is the name if the DLL) Which should I be adding as a insertable object, as the DLL crashes upon use, and if I use the class i cant change the properties?

Another quick question as you appear to be fluent in the language of ActiveX lol, but how do I change my DLL version number so when it gets downloaded on a webpage using CODEBASE, it doesnt just keep a version it already has?

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freehawk15-Apr-04 23:58

freehawk

15-Apr-04 23:58

Hello everyone:
I have a WTL combobox class, but when clicked Enter key, the
combobox can not get the key down message, how to get it?
Please help me.

BTW, I put the combobox in a dialog box and add "WM_KEYDOWN" to the combobox class, but it cannot get this message.

-Freehawk

Re: How to get key-down message in a WTL combobox?

Jörgen Sigvardsson17-Apr-04 6:16

Jörgen Sigvardsson

17-Apr-04 6:16

Take a look at WM_GETDLGCODE[^]

--
Booohoo!

Re: How to get key-down message in a WTL combobox?

Nebojsa Mihajlovic4-May-04 22:52

Nebojsa Mihajlovic

4-May-04 22:52

Sorry for late response.

Subclass the edit part of combo and catch WM_KEYDOWN from it.

in .h file:

<br />
CContainedWindow m_Edit;<br />
<br />
...<br />
<br />
BEGIN_MSG_MAP(CYourClass)<br />
  ...  <br />
  ALT_MSG_MAP(1)<br />
    MESSAGE_HANDLER(WM_GETDLGCODE, OnGetDlgCode)<br />
    MESSAGE_HANDLER(WM_KEYDOWN, OnKeyDown)<br />
    MESSAGE_HANDLER(WM_CHAR, OnEditInputMagnification)<br />
  ...<br />
END_MSG_MAP()<br />

in .cpp file:

in constructor: CYourClass::CYourClass() : m_Edit(_T("EDIT"), this, 1) {}
in OnInitDialog: m_Edit.SubclassWindow(::GetWindow(GetDlgItem(IDC_COMBO), GW_CHILD));

add if you want all keys add following:

<br />
LRESULT CYourClass::OnGetDlgCode(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled)<br />
{<br />
	return DLGC_WANTALLKEYS;<br />
}<br />

and finally you can get KeyDown:

<br />
LRESULT CYourClass::OnKeyDown(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled)<br />
{<br />
	switch (wParam)<br />
	{<br />
	case VK_RETURN:<br />
		{<br />
			...<br />
		}<br />
		break;<br />
	case VK_TAB:<br />
		{<br />
			...<br />
		}<br />
		break;<br />
	}<br />
<br />
	bHandled = FALSE;<br />
	return S_OK;<br />
}<br />

Re: How to get key-down message in a WTL combobox?

kameasha14-Feb-19 11:52

kameasha

14-Feb-19 11:52

Still in demand. Thanks,buddy.

ActiveX Properties

mikewithersone14-Apr-04 12:09

14-Apr-04 12:09

I recently tried to create a property of an activex control that was of type LPCTSTR but after invoking the get and put methods in the test container nothing appears to change? Am I not allowed a variable of this kind for a property because it wasnt on the list when I used the add property wizard so I wrote it in? Help n e 1?

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Mike Dimmick15-Apr-04 1:41

15-Apr-04 1:41

COM interfaces can have parameters of type LPCTSTR, but parameters of this type are not compatible with Automation, and cannot be supplied using IDispatch. Also, for COM, you should explicitly use either LPSTR or LPWSTR, rather than LPTSTR, so that you don't get problems when an application is compiled for UNICODE and the library for ANSI or vice-versa.

If you need to pass a string to an ActiveX control, use a BSTR (variant type VT_BSTR).

Stability. What an interesting concept. -- Chris Maunder

mikewithersone15-Apr-04 2:47

15-Apr-04 2:47

Kewl thanx Ill give it a try, Should I have any problems converting from a BSTR to LPCTSTR? And if so how will I do this (You have to excuse i know nothing really of c++!)

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Mike Dimmick15-Apr-04 4:11

15-Apr-04 4:11

The Complete Guide to C++ Strings, Part I[^]
The Complete Guide to C++ Strings, Part II[^]

Stability. What an interesting concept. -- Chris Maunder

mikewithersone15-Apr-04 12:48

Stop activeX controls tiling when resize

15-Apr-04 12:48

Thanx much appriciated Smile | :)

I know so little of c++!

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mikewithersone13-Apr-04 13:41

Atl Local Variable Release Mode Problem

13-Apr-04 13:41

Ive recently coded a graphics control using ATL where all my draw code is performed using setPixelV directly to the HDC (device context). The problem is Iam trying to change the height and width of the control using the HEIGHT & WIDTH parameters that are declared in the HTML page (My control is IE deployed) upon object declaration. This seems to have some effect because instead of simply giving me a larger draw area it just tiles the existing draw across the screen in the specified height & width!?! Ive tried changing the m_sizeExtent.cx & m_sizeExtent.cy in the actually control code and this seems to be ok in the activeX test container but yet again fails in Internet explorer. Does anyone know how to solve this horrid problem .pretty please Smile | :)

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nlecren13-Apr-04 9:58

nlecren

13-Apr-04 9:58

i have the following problem, if i declare a variable in a local function and then assign a value in a try block under release min dependency the value is corrupt or the same as it was before the try block upon entering the catch. Please what am i doing wrong?? The code is below:

STDMETHODIMP CCMI_BioWrapper::QueryTemplate(BSTR Badge,BSTR *Response)
{
AFX_MANAGE_STATE(AfxGetStaticModuleState())

int nRetCode;
CString strVal;

nRetCode = 0;

try
{
nRetCode = 99;
return S_OK;
}
catch(...)
{
// I would expect nRetCode to be 99 here
// however it is always 0, unless i do a debug build
// then it always works

strVal.Format("Q0 %d",nRetCode);
*Response = strVal.AllocSysString();

return S_OK;
}
}

Paul Ranson13-Apr-04 11:48

Paul Ranson

13-Apr-04 11:48

I don't understand how you can ever be in the catch block. If you 'throw' before or during the code to set 'nRetCode' then its value in the catch block will be indeterminate. But your code cannot throw in its try block...

Paul

nlecren13-Apr-04 17:59

nlecren

13-Apr-04 17:59

Sorry i left out the following line before returning from the try

RaiseException(0,0,0,0);

This is just a sample that creates the problem

Thanks for your reply
If i raise the exception manually i don't understand why the variable is corrupted.

Paul Ranson14-Apr-04 4:04

Paul Ranson

14-Apr-04 4:04

AFAIK direct use of the 'RaiseException' API isn't really appropriate to throw a C++ exception, which is what catch (...) will catch.

This function always prints 'nRetCode = 99'.

void TestFn ()
{
    int nRetVal = 0 ;

    try
    {
        nRetVal = 99 ;

        throw 0 ;

        nRetVal = 1 ;
        std::cout << "nRetVal = " << nRetVal << std::endl ;
    }
    catch ( ... )
    {
        std::cout << "nRetVal = " << nRetVal << std::endl ;
    }
}

Perhaps your problem is down to a conflict between some Structured Exception Handling boilerplate in ATL and C++ exceptions?

Paul