ATL / WTL / STL

2-Oct-06 9:35

Hi.

I'm writing an ATL control, (composite control), and handling some button message I need to load a cursor from resource. So I tried to use the API LoadCursor(hInstance, LPCTSTR lpCursorName) and I found that I need the instance of the control and I don't know where to find it.
With a regular MFC application I can call AfxGetApp()->m_hInstance but now it does'nt work in spite of my application class is derived from CWinApp because it support MFC.

So, how could I get the control hInstance needed for many API functions????

Thank you.

Demian.

"I have always wished that my computer would be as easy to use as my
telephone. My wish has come true. I no longer know how to use my telephone."
-Bjarne Stroustrup, computer science professor, designer of C++
programming language (1950- )

Re: hInstance

Demian Panello2-Oct-06 9:44

2-Oct-06 9:44

I found it! Laugh | :laugh:

Is a member of CComModule, and there's a global object of CComModule called _Module.:->

Re: hInstance

Michael Dunn2-Oct-06 9:55

Michael Dunn

2-Oct-06 9:55

Use _Module.GetResourceInstance() when loading resources.

--Mike--
Visual C++ MVP Cool | :cool:

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Re: hInstance

Demian Panello2-Oct-06 10:20

Quick way to generate C++ files from an IDL file

2-Oct-06 10:20

Ok.
Thank you Mike.

TClarke2-Oct-06 6:07

Re: Quick way to generate C++ files from an IDL file

2-Oct-06 6:07

I have to create an ActiveX control from a huge .IDL file.
I have no problem creating a class to control the control but there seems to be a lot of leg work in writing out the declaration, definition, dispatch enumeration and dispatch map when creating the control class.

Apart from manually running through the properties and methods in the IDL file is there a way of automating this process instead?

Thanks

Tom

It will always be the bane of the civilized as to what to do with the barbarian

Steve S2-Oct-06 22:01

Steve S

2-Oct-06 22:01

In VC6, once you'd built the IDL there was an 'implement interface' option. Can't remember exactly where, since I saw it demo-ed on a COM course once, and never used it myself, since I preferred to go through and do it by hand to help reinforce my memory Smile | :)

Don't know if there's an equivalent in later VS though, as I wouldn't use it if there was ...

Steve S
Developer for hire

Re: Quick way to generate C++ files from an IDL file

Stuart Dootson2-Oct-06 22:42

Re: Quick way to generate C++ files from an IDL file

2-Oct-06 22:42

Ummm - use ATL? That'll do the IDispatch implementation for you if you ask it nicely, as well as loads of other interfaces - I just created an ATL Control class in VS2003 and it looks like it'll implement these interfaces for you:

IDispatch, IPersistStreamInit, IOleControl, IOleObject, IOleInPlaceActiveObject, IViewObjectEx, IOleInPlaceObjectWindowless, IPersistStorage, ISpecifyPropertyPages, IQuickActivate, IDataObject, IProvideClassInfo2<br />

TClarke2-Oct-06 23:36

Re: Quick way to generate C++ files from an IDL file

2-Oct-06 23:36

Thanks for the responses guys Smile | :)

I agree with your do it your self attitude but this interface has literally hundreds of events, methods and properties and I start to go a bit nuts after a while of doing that much repetitive work.

Unfortunately, I've failed at failed at finding any assistance from VC2005. so I've decided I'd rather write a parser myself than manually go through it all. Is there a document that lists the complete spec for IDL files? and would anyone be interested in me publishing the resulting app?

Thanks again

Tom

It will always be the bane of the civilised as to what to do with the barbarian

Steve S3-Oct-06 2:29

Steve S

3-Oct-06 2:29

Would it be less work to use the type library instead of the IDL ?

Steve S
Developer for hire

Re: Quick way to generate C++ files from an IDL file

TClarke3-Oct-06 3:42

Re: Quick way to generate C++ files from an IDL file

3-Oct-06 3:42

Hi Steve

Hmmm... I'm not sure.

The control has to have all the functionality of the old contol but certain of the methods, events and properties require modification. It also has to fit into alot of legacy JavaScript functions and I can only change the GUID which luckily I put into a resource file but modifying the JavaScript is out of the question. The reason I say this is that I am unaware of how to achieve this effect using a type library. A nifty alternative would be great but I haven't thought of one.

Thanks

tom

Stuart Dootson3-Oct-06 3:53

Re: Quick way to generate C++ files from an IDL file

3-Oct-06 3:53

OK - I think I've got an automated solution for you. Note - this was done with VS2003...

Create an ATL DLL project.
Add an 'ATL Control' class. Use some throwaway name for the control interface (because you *will* be throwing it away ), but make sure the class names are ones you're happy with.
Copy'n'paste your IDL interface into the new projects IDL file
In the Class View, right click the ATL Control class and select Add->Implement Interface... The interface you want to implement should be in the dialog that appears. Select it and click Finish. This should create bare method definitions.

Note that I've not determined what happens to event definitions.

TClarke3-Oct-06 5:56

Re: Quick way to generate C++ files from an IDL file

3-Oct-06 5:56

Fantastic solution Big Grin | :-D

Worked like a treat! Events too!

Thanks loads

Tom

It will always be the bane of the civilised as to what to do with the barbarian

Steve S3-Oct-06 6:04

Steve S

3-Oct-06 6:04

Ah. That's how you get to it. I knew it was around here somewhere Smile | :)

Steve S
Developer for hire

Getting HTML Eevents [modified]

georgekjolly2-Oct-06 3:19

georgekjolly

2-Oct-06 3:19

Hi all,

I am a beginner in ATL programming . How I can use IHTMLDocument2 or IWebBrowser2 Objects in my ATL programme made by using "Simple Object"

Please Help me,
Thanks in Advance
George K Jolly

-- modified at 2:16 Tuesday 3rd October, 2006

Re: Getting HTML Eevents

Stephen Hewitt2-Oct-06 6:00

Stephen Hewitt

2-Oct-06 6:00

Typically you use the standard COM connection point mechanism to receive events.

Steve

Re: Getting HTML Eevents

georgekjolly2-Oct-06 20:23

georgekjolly

2-Oct-06 20:23

Hi Steve,

Thanks for reply,

I am a beginner in ATL programming. I Just want to know ,How to implement any COM Object for eg: IWebBrowser2 or IHtmldocument etc. in My ATL Programme. So that I can catch any event from my webbrowser or Html Document. Is there any example codes available.

Thanks
George K Jolly

error in compiling WTL

manish19821-Oct-06 12:54

manish1982

1-Oct-06 12:54

while compiling my first WTL prog I got lots of errors saying

C:\VISUALSTUDIO_6.0\WTL71\INCLUDE\atlapp.h(396) : error C2872: 'ATL' : ambiguous symbol

i read lots of articles on the net n readme file as well but not able to get rid of this.
it seems a common error generated due to bug in atlbase.h but how to come out of it.
please help me
thanx in advance

Re: error in compiling WTL

Stuart Dootson1-Oct-06 20:43

Multiple inheritance and class pointer

1-Oct-06 20:43

Google is your friend...that would point you to this[^], which recognises the problem and describes a workaround:

It's a bug in ATL that affects WTL. The readme.html file included with
WTL7.5 (the latest WTL version, available at
http://sourceforge.net/projects/wtl) describes the workaround:

... Surround atlbase.h include declaration with following statements:

#define ATL ATLFIX
#include <atlapp.h>

#undef ATL

namespace ATL = ::ATLFIX;

It also describes the nature of the bug and the reason for the error
message.

Samy_Ibraheem_Mo30-Sep-06 9:46

Samy_Ibraheem_Mo

30-Sep-06 9:46

a class inherited from 2 or more class can i cast the pointer of this new class to a pointer of 1st parent and call a function and then cast it again to a pointer of the 2nd parent and call its function. and if it is allowed what is the rules and limitation to do this?

Re: Multiple inheritance and class pointer

Stuart Dootson30-Sep-06 11:56

30-Sep-06 11:56

The example below shows two base classes (A and B) and a class that derives from them both (C). Now, you can cast a C* pointer to A* or B* with static_cast. This will call non-virtual methods on A or B respectively. However, for virtual methods, you need to explicitly ask for the parent classes version, as shown in the comments.

So...to get what you want, you don't actually need a cast at all - just specify that you want to call the parent classes method using the class-name:: notation.

#include <iostream>

class A
{
public:
   void M() { std::cout << "A::M - this = " << (int)this << "\n"; }
   virtual void X() { std::cout << "A::X - this = " << (int)this << "\n"; }
};

class B
{
public:
   void N() { std::cout << "B::N - this = " << (int)this << "\n"; }
   virtual void Y() { std::cout << "B::X - this = " << (int)this << "\n"; }
};

class C : public A, public B
{
public:
   void M() { std::cout << "C::M - this = " << (int)this << "\n"; }
   void N() { std::cout << "C::N - this = " << (int)this << "\n"; }
   virtual void X() { std::cout << "C::X - this = " << (int)this << "\n"; }
   virtual void Y() { std::cout << "C::Y - this = " << (int)this << "\n"; }
};

int main(int, char**)
{
   C c;
   
   // Call C::X through C
   c.X();
   // Call A::X through C
   c.A::X();
   // Call C::X through A*
   static_cast<A*>(&c)->X();
   // Call A::X through A*
   static_cast<A*>(&c)->A::X();
   
   // Call C::M through C
   c.M();
   // Call A::M through C
   c.A::M();
   // Call A::M through A*
   static_cast<A*>(&c)->M();
   // Call A::M through A*
   static_cast<A*>(&c)->A::M();

   // Call C::Y through C
   c.Y();
   // Call B::Y through C
   c.B::Y();
   // Call C::Y through B*
   static_cast<B*>(&c)->Y();
   // Call B::Y through B*
   static_cast<B*>(&c)->B::Y();
}

Drawing

Demian Panello27-Sep-06 6:24