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Ya,
Thanks, I re-installed VS .NET 2003 fully & I found all of them.
-Tom
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Hello. I am new to ATL and had a serious problem, see I want to use interface A and interface B, both from MS. The bad thing is they all have method named "GetWindowHandle", what should I do ???!!!
I tried to modify one of them's header to just make it compile, but it just sucks, I think there must be a decent solution.
Thanks a lot ahead.
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Assuming that you want to return different things for each GetWindowHandle, you can do this:
template <typename T>
class InterfaceAShim : public InterfaceA {
STDMETHOD(GetWindowHandle)(HWND* phwnd) { return static_cast<T*>(this)->InterfaceA_GetWindowHandle(phwnd); }
};
class YourClass : public InterfaceAShim<YourClass>, public InterfaceB
{
...
HRESULT InterfaceA_GetWindowHandle(HWND* phwnd) {
}
STDMETHOD(GetWindowHandle)(HWND* phwnd) {
}
};If you are going to return the same handle in both methods, you don't have to do anything.
Good music: In my rosary[^]
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Hi, Jörgen:
Thank you so much, just 3 small questions:
1. Then the best bet in my code is Not use a method name same as common interface method, like GetWindowHandle, IsDirty, and so on. Right? Otherwise, it is tedious to write this kind of wrapper. (Is it the only solution? I think so)
2. why do you use static_cast, since static_cast do not do run time check, there is no difference with reinterpret_cast here.
3. Here:
template <typename t="">
class InterfaceAShim : public InterfaceA {
STDMETHOD(GetWindowHandle)(HWND* phwnd) { return static_cast<t*>(this)->InterfaceA_GetWindowHandle(phwnd); }
};
I think inside InterfaceAShim, I need only declare one duplicate method name OR I have to declare all methods from InterfaceA, just want to confirm.
Thanks again, you are ATL guru.
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LongIsland wrote:
1. Then the best bet in my code is Not use a method name same as common interface method, like GetWindowHandle, IsDirty, and so on. Right? Otherwise, it is tedious to write this kind of wrapper. (Is it the only solution? I think so)
AFAIK, there is no automated process for this.  But I wouldn't say it's the best approach either. I mean, if your method names become odd looking and non descriptive, it's not good.
LongIsland wrote:
why do you use static_cast, since static_cast do not do run time check, there is no difference with reinterpret_cast here.
Because I'm doing an "upcast". T is a subclass of the template. Draw a picture! Thus I don't have to do any casts, because the pointer types are related.
LongIsland wrote:
I think inside InterfaceAShim, I need only declare one duplicate method name OR I have to declare all methods from InterfaceA, just want to confirm.
You only need to declare the duplicate names. Unbound names are deferred to the next subclass, which is your COM class.
Good music: In my rosary[^]
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Hello Jörgen,
If the COM class is written using ATL, how would you write the shim class ?
Many thanks, Jörgen.
Bio.
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Hello Jörgen,
I did me experimentation just a while ago and found that the two (or more) interfaces that has common method names must have a shim class to represent them. For example :
[in ATL]
template <typename T>
class InterfaceAShim : public IDispatchImpl<IInterfaceA, &__uuidof(IInterfaceA), &LIBID_ObjectInterfacesLib, 1, 0>
{
public :
STDMETHOD(Method01)(BSTR stringParam)
{
return static_cast<T*>(this)->InterfaceA_Method01(stringParam);
}
};
template <typename T>
class InterfaceBShim : public IDispatchImpl<IInterfaceB, &__uuidof(IInterfaceB), &LIBID_ObjectInterfacesLib, 1, 0>
{
public :
STDMETHOD(Method01)(BSTR stringParam)
{
return static_cast<T*>(this)->InterfaceB_Method01(stringParam);
}
};
And the implementation class :
class ATL_NO_VTABLE CObjImpl01 :
public CComObjectRootEx<CComSingleThreadModel>,
public CComCoClass<CObjImpl01, &CLSID_ObjImpl01>,
public ISupportErrorInfo,
public IConnectionPointContainerImpl<CObjImpl01>,
public CProxy_IObjImpl01Events<CObjImpl01>,
public IDispatchImpl<IObjImpl01, &IID_IObjImpl01, &LIBID_ObjectImplementation01Lib, /*wMajor =*/ 1, /*wMinor =*/ 0>,
public InterfaceAShim<CObjImpl01>,
public InterfaceBShim<CObjImpl01>
{
...
...
...
public:
STDMETHOD(InterfaceA_Method01)(BSTR stringParam)
{
return S_OK;
}
STDMETHOD(InterfaceB_Method01)(BSTR stringParam)
{
return S_OK;
}
// Must comment out.
/*
STDMETHOD(Method01)(BSTR stringParam)
{
return S_OK;
}
*/
};
I also found that if I ever define Method01() in the implementation class CObjImpl01 (i.e. by uncommenting it), the Method01()s of the shims never get called. I'm not sure if they are still part of the final compiled code of CObjImpl01.
Any comments, Jörgen ?
Best Regards,
Bio.
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Sorry for the late reply, I was out of town until now.
Lim Bio Liong wrote:
I also found that if I ever define Method01() in the implementation class CObjImpl01 (i.e. by uncommenting it), the Method01()s of the shims never get called.
That's because you rebind the entries in the vtable again in your implementation class. Remember, COM methods are virtual!
The both shims bind Method01 to its corresponding entry in their vtables. If you redeclare the method Method01 in the COM class (which inherits both), it'll rebind the method vtable entry for Method01, in all inherited vtables. Please note that C++ only does this for methods whose names and parameter signature match (i.e. standard C++ overloading rules).
Good music: In my rosary[^]
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Hello Jörgen,
Thanks very much. I got it now. It's a brilliant solution. This series of discussions seem like a good subject for an article.
Thanks, again, Jörgen.
Best Regards,
Bio.
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I am currently designing a program that needs the ca2wex but i can not locate it anywhere, i have the atl library and atlconv but i do not have and cannot find this class if anyone knows where i can get it or at least a way i can implement it myself i would appreciate it thank you.
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(ATL/COM/MFC/C++)
HI, I'm beginner about Window programming
I'd like to develop a small dll that has a function.
There is one text(txt file) loaded on IE.
The txt contains just a words like "Hello!!".
I've made that the "Hello!!" has focus of cursor.
I mean If I move cursor on "Hello!!"
then arrow-shaped cursor would be changed to hand-shape on a web page.
Now, If I click the "Hello!!",
the programe opens new dialog that has a static text.
The static text shows me "Hello!!".
That's all. How can I make this?
any reply, any URL contains some reference about this, offer me please.
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As easy as this is to say, it's more complex than just what you're wanting (I believe). Although from your description, you could do all this in straight DHTML ...
Regardless: if you're wanting to program IE, then you'll want the book called Programming Internet Explorer by Microsoft Press.
FYI - if you are beginning windows programming, as you've stated, ATL and COM are far too advanced to start with ... you need to start with learning C++ first. Not programming IE ... (just my personal opinion on this).
Good-luck.
:..::. Douglas H. Troy ::..
Fold with us|Development Blogging|viksoe.dk's site
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Thank you for your answer
Sorry for my question that was not announced my statu minutely.
I've just graduated from my University. So I'd already learn c++ and more stuff.
And, I've been reading the book Programming IE5(MS),
and I'm beginner of ATL/COM.
So I need your answer about my question. Please~;)
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<br />
class CDialogPage1 : public CDialogImpl <CDialogPage1><br />
{<br />
enum { IDD = IDD_DLG1 };<br />
...<br />
}<br />
<br />
class CDialogPage2 : public CDialogImpl <CDialogPage2><br />
{<br />
enum { IDD = IDD_DLG2 };<br />
...<br />
}<br />
<br />
class CSettingDlg : public CDialogImpl <CSettingDlg><br />
{<br />
public:<br />
enum { IDD = IDD_SEETINGDLG };<br />
....<br />
??? GetDialog(UINT DIALOG_IDD) <br />
{<br />
}<br />
private:<br />
CDialogPage1 m_page1;<br />
CDialogPage2 m_page2;<br />
}<br />
how to write this GetDialog function?
or maybe i should change CDialogPage1 & CDialogPage2 , make them inherit from the same class? could anyone give me some hints?
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Are you trying to build a wizard or use a tab ctrl? In which case you could use CPropertySheetWindow to implement this functionality ...
Maybe more details on what exactly it is you're trying to do/implement might better help us (or at least myself) understand how to answer ...
:..::. Douglas H. Troy ::..
Fold with us|Development Blogging|viksoe.dk's site
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i'm tring to implement a options dialog which is like in the VS.NET 2003
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Greetings,
First, I apologize for what must be in a FAQ somewhere that I haven't located. I have tried.
Here is the basic question (details below): How do I turn off canonical input processing on an arbritrary istream? Failing that, how do I do it with just cin using VC++ 7.1?
The gory details:
I am writing a function that is part of a larger project so I don't have a lot of control over the style of its parameters. It gets an istream and ostream pointer. With the istream pointer I have to read a character at a time as this is for an interactive application; I need to react to each character as it is entered, not after the entire line has been entered. Like an editor.
But if the istream is std::cin, then I have canonical line processing (no extra charge!) where the characters are echoed to the user, ^H (backspace) is interpreted, and nothing is available to the calling program until a newline has been entered.
If I compile under GCC 3.4.4, I can (with vast pain) determine that the istream is associated with file descriptor 0 (STDIN_FILENO) and use tcgetattr/tcsetattr to turn off the canonical processing.
But these functions (tcgetattr/tcsetattr) do not appear to be available in VC++ 7.1
I have looked for days for a general way to deal with this problem and either it is so obvious that nobody mentions it or I have completely missed it. Even the GCC documentation doesn't give a solution for itself (though I found one on the net). The VC++ documentation casually mentions that istream buffering can be turned off, but doesn't say how. Perhaps they were not referring to canonical processing but something else...
I have tried some of the obvious stuff already:
#include <iosfwd>
#include <iostream>
using namespace std;
int main(int argc, char *argv[])
{
char inChar;
#if 0
cin.rdbuf()->pubsetbuf(0,0);
#endif
#if 0
cin.setbuf(0,0);
#endif
#if 0
cin >> unitbuf;
#endif
#if 0
cin.setf(ios::unitbuf);
#endif
while(cin)
{
cin.get(inChar);
if(inChar == '\004') break;
cout << "\nRead in '" << inChar << "'\n" << flush;
}
return(0);
}
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If I want to process a std::vector using a reverse_iterator (because the element I'm looking for is likely to be near the end), how do I remove the element from the vector after I locate it?
typedef std::vector<GROUP_HANDLE> GroupHandleList;
GroupHandleList::reverse_iterator i;
bool done = false;
for ( i = GHList->rbegin(); !done && i != GHList->rend(); i++ )
{
GROUP_HANDLE gi = *i;
if ( gi == hGroup )
{
// ?? I want to call:
// GHList->erase(i);
// but that requires an 'iterator', not a 'reverse_iterator'
done = true;
}
}
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Try
GHList->erase(i.base()-1);
Nish
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 I can't believe I haven't read this before.
Thanks for the link.
My programming blahblahblah blog. If you ever find anything useful here, please let me know to remove it.
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You mean you don't have "Effective STL"? Shame!
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I took the plunge. One word - 'Wow!'. What a fantastic library!
Can anyone give me some quick Boost recommendations? So far I have used list_of(), indirect_iterator, tokenizer, trim and, of course, shared_ptr. What are your favourite Boost libs?
The Rob Blog
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