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I am currently working on handling ATL COM events in WIN32 exe (on winCE platform using eVC++). I am able to raise an event in COM component but not able to handle it in WIN32 exe.
I have tried different ways to implement this functionality but the results are same. If I port the code in VC++ it works fine.
My work has halted due to this problem. Please let me know the solution to this problem.
Thanks in advance.
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Hello, All!
I need to place a background image to my CListViewCtrl. How to do it??? I used WM_ERASEBKGND handler, but list-view' items cover my image...
(Report, List view)
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I am trying to host an ActiveX control in a WTL Dialog app, very similar to what the example in the article "WTL for MFC Programmers, Part VI". I think the example given by Michael Dunn will be a great help to me, except that it does not complile in Visual Studio .NET 2003. There must have been changes to ATL or WTL that make the code not compile? Can anyone help me get it to build?
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Here are the errors I am getting when I try to build:
Compiling...
maindlg.cpp
d:\samples\WTL4MFC6_demo\IEHost\maindlg.h(112) : error C2955: 'ATL::IDispEventSimpleImpl' : use of class template requires template argument list
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\atlmfc\include\atlcom.h(4122) : see declaration of 'ATL::IDispEventSimpleImpl'
d:\samples\WTL4MFC6_demo\IEHost\maindlg.h(112) : error C2440: 'static_cast' : cannot convert from 'CMainDlg::_ComMapClass *' to 'ATL::IDispEventSimpleImpl *'
Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
d:\samples\WTL4MFC6_demo\IEHost\maindlg.h(112) : error C2440: 'initializing' : cannot convert from 'ATL::_ATL_CREATORARGFUNC (__stdcall *)' to 'DWORD_PTR'
This conversion requires a reinterpret_cast, a C-style cast or function-style cast
IEHost.cpp
d:\samples\WTL4MFC6_demo\IEHost\maindlg.h(112) : error C2955: 'ATL::IDispEventSimpleImpl' : use of class template requires template argument list
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\atlmfc\include\atlcom.h(4122) : see declaration of 'ATL::IDispEventSimpleImpl'
d:\samples\WTL4MFC6_demo\IEHost\maindlg.h(112) : error C2440: 'static_cast' : cannot convert from 'CMainDlg::_ComMapClass *' to 'ATL::IDispEventSimpleImpl *'
Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
d:\samples\WTL4MFC6_demo\IEHost\maindlg.h(112) : error C2440: 'initializing' : cannot convert from 'ATL::_ATL_CREATORARGFUNC (__stdcall *)' to 'DWORD_PTR'
This conversion requires a reinterpret_cast, a C-style cast or function-style cast
Generating Code...
IEHost - 6 error(s), 0 warning(s)
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Yeah, I did things the hard way in that example - there's no need to manually build the SINK_MAP macros since ClassWizard (in VC6 at least) can do it for you. I haven't looked at VC7 enough to know where the equivalent feature is but I would assume it's still in there.
--Mike--
Visual C++ MVP 
LINKS~! Ericahist | 1ClickPicGrabber | CP SearchBar v2.0.2 | C++ Forum FAQ
Strange things are afoot at the U+004B U+20DD
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hello,
i've created a std::list of objects, and it works well, but i'd like to support additional functionality for the list, such as writing certain aspects of the objects to stdout/cout (or dumping them using TRACE macros), matching certain aspects of objects (i.e., several different "match" functions), populating a list box with objects' names, etc. i've tried 2 approaches:
1. wrap the std::list in a class that handles these functions by using the list's iterators. this is inelegant, so i switched to:
2. subclass my std::list<myobject>, and add the functions i need to the new class. from what i've read on the web, subclassing std::list isn't a good idea, due to the virtual destructor problem.
my guess is that i should be using functions that operate on this list, but creating functions instead of list methods seems to violate the whole point of using c++. i'd appreciate any advice, since this is my first project using the stl, and i'm still waiting for my stl book to arrive in the mail....
ed
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If you don't add any new data in your derived class, you should be OK in most cases (because your derived destructor won't actually need to do anything more than the std::lsit destructor).
OTOH - ehh wrote: violate the whole point of using c++ - well, C++ is a multi-paradigm language, so using separate free functions doesn't really violate any point of C++....
Stuart Dootson
'Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p'
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| Hi All, I have a program which uses the IE engine to display HTML documents (using ATL) in my program's window. I'm trying to figure out how to make the COPY work, when some of the highlighted display is right-clicked. The program isn't creating the edit menu which appears when it is right-clicked, so I assume IE is doing that. The COPY appears in the menu, but clicking on it does not copy the text to the clipboard (at least, doing paste after that does not paste what I just tried to copy). If I display the same html doc in Internet Explorer, then the copy works fine. I've tried adding this code: m_spOleCmdTarg->Exec(NULL,OLECMDID_COPY,OLECMDEXECOPT_DONTPROMPTUSER,NULL,NULL); which does get executed when the user clicks on Copy in the System Menu. But still, the paste does not paste what I just tried to copy. Does anyone have any idea what I might be missing here? Any ideas are greatly appreciated. Thanks, Melena 
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I did this in one of my apps:
pWB2->ExecWB ( OLECMDID_COPY, OLECMDEXECOPT_DONTPROMPTUSER, NULL, NULL ); and it works without a hitch. I'm using a different interface than you, however.
--Mike--
Visual C++ MVP 
LINKS~! Ericahist | 1ClickPicGrabber | CP SearchBar v2.0.2 | C++ Forum FAQ
Strange things are afoot at the U+004B U+20DD
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| Thanks Mike. So you didn't have to enable anything to make the copy work? I've seen things like UIEnable function calls, so I'm wondering if that's what I'm missing. Also, had you created your own menu which is run when the user right-clicks in the browser, or was it just using the IE engine right-click menu? I'm wondering how you knew when to execute the pWB2->ExecWB... Thanks again, Melena
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I've figured this problem out. Was using CoInitialize() instead of OleInitialize(). The OleInitialize() makes the clipboard available, once I started using that, the copy worked fine.
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If I have an STL container that contains objects, then I can compare them easily - for example:
class CMyClass
{
int m_n;
CMyClass(int n) : m_n(n) { }
bool operator==(const CMyClass& o) const
{
}
};
...
vector<CMyClass> v1;
vector<CMyClass> v2;
v1.push_back(CMyClass(1234));
v2.push_back(CMyClass(1234));
if (v1 == v2)
However, I often use containers of pointers, and when I do, comparing two containers doesn't call the objects operator== function. For example:
class CMyClass
{
int m_n;
CMyClass(int n) : m_n(n) { }
bool operator==(const CMyClass& o) const
{
}
};
...
vector<CMyClass*> v1;
vector<CMyClass*> v2;
v1.push_back(new CMyClass(1234));
v2.push_back(new CMyClass(1234));
if (v1 == v2)
My question is - are there any operators I can overload to make the comparison work for containers of pointers, or do I need to hand-roll my own comparison function? I hope this makes sense!
The Rob Blog
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OK, after some experimenting I realised that std::equal can be passed a function object, so I now have something like this:
template <class T>
class EqualT
{
public:
inline bool operator()(const T* t1, const T* t2) { return *t1 == *t2; }
};
...
vector<CMyClass*> v1;
vector<CMyClass*> v2;
...
if (equal(v1.begin(), v1.end(), v2.begin(), EqualT<CMyClass>()))
Using a function object template means I can compare containers containing other pointer type - the EqualT operator() handles the de-referencing. Nice.
The Rob Blog
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I meant:
struct EqualT
{
template <class T>
inline bool operator()(const T* t1, const T* t2) const { return *t1 == *t2; }
};
...
vector<CMyClass*> v1;
vector<CMyClass*> v2;
...
if (equal(v1.begin(), v1.end(), v2.begin(), EqualT()))
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You could use boost::indirect_iterator[^] - then you don't need to do anything much (except use Boost!).
Of course, you're pulling a fair number of headers in, but who knows, you might find other parts of Boost you want to use...
Stuart Dootson
'Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p'
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http://code.axter.com/clone_ptr.h
The above smart pointer has operator==() functions that work on the object itself instead of the pointer.
Example code:
#include <iostream><br />
#include <list><br />
#include "clone_ptr.h"<br />
<br />
using namespace std;<br />
<br />
class A<br />
{<br />
public:<br />
A(int a) : m_a(a) {}<br />
virtual ~A() {}<br />
virtual void Somefunction() const<br />
{<br />
cout << "I'm A " << m_a << endl;<br />
}<br />
bool operator==(const A& Src)const{return (m_a == Src.m_a);}<br />
int m_a;<br />
};<br />
<br />
class B : public A<br />
{<br />
public:<br />
B(int a) : A(a) {}<br />
void Somefunction() const<br />
{<br />
cout << "I'm B " << m_a << endl;<br />
}<br />
};<br />
<br />
class C : public A<br />
{<br />
public:<br />
C(int a) : A(a) {}<br />
void Somefunction() const<br />
{<br />
cout << "I'm C " << m_a << endl;<br />
}<br />
};<br />
<br />
int main(int argc, char* argv[])<br />
{<br />
list<clone_ptr<A> > MyListOfA_PtrsX;<br />
MyListOfA_PtrsX.push_back(new A(1));<br />
MyListOfA_PtrsX.push_back(new A(2));<br />
MyListOfA_PtrsX.push_back(new A(3));<br />
<br />
list<clone_ptr<A> > MyListOfA_PtrsY;<br />
MyListOfA_PtrsY.push_back(new B(4));<br />
MyListOfA_PtrsY.push_back(new B(5));<br />
MyListOfA_PtrsY.push_back(new B(6));<br />
<br />
list<clone_ptr<A> > MyListOfA_PtrsZ;<br />
MyListOfA_PtrsZ.push_back(new C(1));<br />
MyListOfA_PtrsZ.push_back(new C(2));<br />
MyListOfA_PtrsZ.push_back(new C(3));<br />
<br />
bool IsEqual1 = (MyListOfA_PtrsX == MyListOfA_PtrsY);
bool IsEqual2 = (MyListOfA_PtrsX == MyListOfA_PtrsZ);
<br />
cout << IsEqual1 << endl;<br />
cout << IsEqual2 << endl;<br />
<br />
system("pause");<br />
return 0;<br />
}
Top ten member of C++ Expert Exchange.
http://www.experts-exchange.com/Cplusplus
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forgive me if my ask is not about the theme treated in this forum.
I am working in c++ builder 6.0, i am using the GetHeapStatus function to know the memory allocated by the application, but all the fields of the struct returned by the function are in 0, why can I do??
Thanks.
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I have a lot of places in my code where I am using a static const table that I then use for lookup purposes. For example:
static const struct
{
LPCTSTR psz;
UINT n;
} table[] =
{
_T("Rob"), 1971,
_T("Becky"), 1977,
};
...
for (int i = 0; i < sizeof(table) / sizeof(*table); i++)
{
...
}
This is all well and good, but now I am an STL fanatic I would rather using a static vector (so I can utilize find_if, for_each, etc.
My question - is there an elegant way to initialise a container whilst still making the whole thing const. For example, the following would be sweet:
class CMyData
{
public:
LPCTSTR m_psz;
UINT m_n;
CMyData(LPCTSTR psz, UINT n) : m_psz(psz), m_n(n) { }
};
static const vector<CMyData> v =
{
CMyData(_T("Rob"), 1971),
CMyData(_T("Becky"), 1977),
};
The above doesn't work. No surprises. If instead I do something like this:
static const vector<CMyData> v;
if (v.empty())
{
v.push_back(...);
v.push_back(...);
}
The fact the vector is defined as 'const' means I can't add anything to it the first time the function is called. I guess I could instead do:
static vector<const CMyData> v;
if (v.empty())
{
v.push_back(...);
v.push_back(...);
}
The above works OK, but I wondered if any STL gurus had any other solutions?
The Rob Blog
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I don't see how making the container itself const would be useful. If you can't modify the vector, how can you add objects to it?
BTW check out boost::assign[^] for some neat classes that make STL container initialization nicer.
--Mike--
Visual C++ MVP
LINKS~! Ericahist | 1ClickPicGrabber | CP SearchBar v2.0.2 | C++ Forum FAQ
Strange things are afoot at the U+004B U+20DD
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Michael Dunn wrote:
I don't see how making the container itself const would be useful.
Because, like in my first static const struct example, I only want the container for lookups - I won't add anything to it once it has been initialized. Looks like I might have to check Boost out...
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Looks like the Boost 'list_of' function is exactly what I need!
e.g.:
static const vector<int> v = list_of(1)(2)(3)
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Is there any way to use a function object with find_if instead of a predicate? Predicates have limited use, and it would be neat if I could do something like this:
struct findfunc
{
CMyPtr* m_pData;
findfunc(CMyPtr* p) : m_pData(p) { }
bool operator()(CMyData* ptr)
{
return (ptr->blah == m_pData->blah);
}
}
...
std::list<CMyData*> mylist;
...
CMyPtr somedata;
...
std::list<CMyData*>::iterator it = std::find_if(mylist.begin(), mylist.end(), findfunc(somedata));
Basically, I want to perform a more advanced search (on any STL container) than find_if currently allows. I am quite new to STL, so please bear with me!
The Rob Blog
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