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with API use CreateFile, with traditional C++ use std::fstream
-Derick
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Hai all,
I have a basic doubt when to use the Composite Design Pattern and When to use the Builder Design Pattern.
Do anyone explain me its difference with a scenario.
With Thanks,
Arun Chakaravarthy
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You are referring to interface based design and template based design, correct?
COM is based on interface based design (composite) as an object and its type is only exist at runtime.
Template based design (builder) is known at compile-time.
Kuphryn
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LPDRAWITEMSTRUCT lpdis;
In an Ownerdrawn menu handler WindowFromDC(lpdis->hDC) always return zero?
Any clues?
Thanks,
Derick.
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And it always will.
HMENU's are the resource of a window - and never a true user accessable window themselves. It has something to do with the way that windows internally deals with menus - somehow that bit of geek trivia is lost to me & forgotten.
But I wouldn't wory about it, if you're doing an owner draw menu - all you need is the HDC anyways. If you need dimensions of the full menu for a side bar or something, I'd check out the multiple ownerdraw menu samples here on codeproject.
[ Jason De Arte | Toy Maker | 1001010.com ]
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But I think I found the problem. It has something to do with mwnu animation. for animation purpouse, widows supplies another dc. This is what i think happens with a context menu.
-Derick
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please help me .i wonder if the WTL is only used for the VC?
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I 'am (beginner) in program ATL 7.0. I have made a ActiveX-control (with DirectX drawing a cruve,ATLserver, DLL) DirectX drawn also its own background. The control will be created with "CAxWindow"->CreateControl in the client window.
The problem is that the control first draw the background color and then DirectX draw also secondly its own background and the curve. I have tryed with WM_ereaseBkgnd (in ATL DLL) to prevent the first drawing background, but the routine will not be called.
Also the WM_ereaseBKgnd on the client side will not be called.
I don't know how prevent background drawing?
Theon
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I wrote an Active X control using only ATL (no MFC), for use on a web page. When the control ends, it needs to go to another web page within the SAME IE browser window.
I am currently using:
ShellExecute(NULL,"open",NewPage,NULL,NULL,SW_SHOW)
to do this.
The problem is that this opens the new web page (whose URL is NewPage) in the default Browser, which isn't always always IE (it might be Netscape for example). It also opens a new IE window if the user has unselected "Reuse windows for launching shortcuts" in their IE Internet options. The most common problem, however, is that it opens a new "tab" in "Slimbrowser" and other "tab" based browsers.
The only solution seems to be to get a "IServiceProvider" pointer to the current browser window, then I can do a "IServiceProvider::QueryService" to get a "IWebBrowser2" pointer, and then use "IWebBrowser2::Navigate" to go to the new URL in the same window. This technique is described here: http://msdn.microsoft.com/msdnmag/issues/01/06/c/
However, I can't for the life of me figure out how to get the "IServiceProvider" pointer. In the above mentioned article, they said they got the pointer from the "Active Accessibility SDK", but not how. Also, I would prefer not to have to use this SDK.
I'm sure there is an easier way to do this. Remember that I can't use MFC!
Thanks in advance for any help you can give me!
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You're on the right track. But missing one detail - IOleObject::GetClientSite
Here's a code snip that I used in a recent ATL based ActiveX control to get the IHTMLDocument2 interface of the parent IE WebBrowser. Sure it goes a little farther than what you want by getting the document (one extra call), but it demonstrates the concept.
inline HRESULT GetIEDocument(IOleObject* pObject, IHTMLDocument2 ** ppDocument2 )
{
CComPtr<IOleClientSite> spClientSite;
CComPtr<IServiceProvider> spSrvProv;
CComPtr<IWebBrowser2> spWebBrowser;
CComPtr<IHTMLDocument2> spHTMLDoc2;
if( !ppDocument2 || !pObject )
{
ATLASSERT(!"Bad pointer param");
return E_POINTER;
}
HRESULT hr = pObject->GetClientSite((IOleClientSite **)&spClientSite);
if( FAILED(hr) )
return hr;
hr = spClientSite->QueryInterface(IID_IServiceProvider, (void **)&spSrvProv);
if( FAILED(hr) )
return hr;
hr = spSrvProv->QueryService(SID_SWebBrowserApp, IID_IWebBrowser2, (void **)&spWebBrowser);
if( FAILED(hr) )
return hr;
hr = spWebBrowser->get_Document((LPDISPATCH*)&spHTMLDoc2);
if( FAILED(hr) )
return hr;
(*ppDocument2) = spHTMLDoc2;
(*ppDocument2)->AddRef();
return S_OK;
}
BTW, To the best of my knowlege ActiveX controls don't work in Nutscrape. Did you find a way for them to work?
[ Jason De Arte | Toy Maker | 1001010.com ]
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Thanks Jason!
I only had to make a few changes to get your code working in my app.
I didn't need to pass the "IOleObject* pObject" object, since this code was in the same class as the main ATL ActiveX control. Aside from that, I just had to add the template definitions for the ATL classes used (IOleClientSite,IServiceProvider,IWebBrowser2). Also, "m_sLandingPage" is a global char* to the URL to navigate to. I think this code should work in almost any ATL ActiveX control.
And no, unfortunately, we weren't able to figure out a way to get ActiveX controls to work in Netscape, after much effort. The conclusion we came to was that it would require so much of Java wrapper that it was impractical.
<br />
bool Ccompctrl::LaunchURL()<br />
{<br />
CComPtr<IOleClientSite> spClientSite;<br />
CComPtr<IServiceProvider> spSrvProv;<br />
CComPtr<IWebBrowser2> spWebBrowser;<br />
<br />
HRESULT hr = GetClientSite((IOleClientSite **)&spClientSite);<br />
if( FAILED(hr) )<br />
return false;<br />
<br />
hr = spClientSite->QueryInterface(IID_IServiceProvider, (void **)&spSrvProv);<br />
if( FAILED(hr) )<br />
return false;<br />
<br />
hr = spSrvProv->QueryService(SID_SWebBrowserApp, IID_IWebBrowser2, (void **)&spWebBrowser);<br />
if( FAILED(hr) )<br />
return false;<br />
<br />
CComVariant vNull;<br />
CComBSTR bsLandingPage = m_sLandingPage;<br />
hr = spWebBrowser->Navigate(bsLandingPage, &vNull, &vNull, &vNull, &vNull);<br />
if( FAILED(hr) )<br />
return false;<br />
<br />
return true;<br />
}<br />
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I guess the same thing happened to you that just happened to me. The the template definitions, which were inclosed in "<>" were lost because it was considered HTML.
Here are the correct first three lines :
CComPtr<IOleClientSite> spClientSite;
CComPtr<IServiceProvider> spSrvProv;
CComPtr<IWebBrowser2> spWebBrowser;
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d'oh!
Updated.
[ Jason De Arte | Toy Maker | 1001010.com ]
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How can i use this for MSFLEXGRID control?
I use this, but it has runtime error!
void CMyViewEx::OnInitialUpdate()
{
AddResizedControl(IDC_MSFLEXGRID1, TOP_LEFT, BOTTOM_RIGHT);
CResizableFormView::OnInitialUpdate();
AnchorControls(); //Error here
}
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Sir,
I m implementing std::maps and new to maps
I am using int as the key and the class as the value.
I have declared it like this
But my main is to insert a int as the key and the entire class as the value.
Also by giving the key ,I want to get the value using find function
How to achieve this.
Pls correct me if I am wrong.
#include <iostream>
#include <string>
#include
class one
{
int age;
int sal;
}one1;
typedef map<int,one1> Map1;
int main()
{
Map theMap1;
Map::iterator theIterator1;
one.age =50;
theMap1.insert(Map::value_type(0,one.age));
theMap1.insert(Map::value_type(1,one.age));
return 0;
}
I am getting errors
Regards
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You seem to have a confusion between Map1 and Map, between one1 and one, or are these just typos in the post?
What are your errors?
Paul
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I need to map an int to a class.
so this is the code.I hope I am clear.
#include <iostream>
#include <string>
#include
sing namespace std;
class one
{
int age;
int sal;
}one1;
typedef map<int,one1> Map;
int main()
{
Map theMap;
Map::iterator theIterator;
//Open the file
//Read each line of file and store in class variables
index = 0;
while(!file.eof())
{
one.age =50;
one sal = 1000;
theMap.insert(Map::value_type(index,one));
index++;
}
//to get the class
theIterator = theMap.find(0);
//Get the entire first record ?How should I achieve this which is stored in a class?
cout << endl << "The class "<< (*theIterator).first;
cout << endl << "The class "<< (*theIterator).second << endl ;
return 0;
}
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i had a little time to delve into this, so here you go:
It appears that your map declaration is incomplete:
typedef map Map
should look like:
typedef map<int, one=""> Map
stl maps are templated classes, meaning at declartion time
the coder needs to tell the map what is being stored
in the map, in this case, an integer and a One object are
being stored in the map.
--
your One class should have the age
and salary members public (for the quicky example);
I changed your One class to look like
class One
{
public:
One() {age = -1; sal = -1;}; //ctor
int age; // these could be private wwith public accessors..
int sal;
protected:
private:
};
--
also in your while loop, you should
instantiate a new One object (either
on the heap with 'new' or on the stack like below):
when assigning the int and the One object to the
map, stl will use the One object's copy constructor
to make a copy of the object to store in the map;
while(!file.eof())
{
One newOne; // create new Oneobject on the stack
newOne.age = 50;
newOne.sal = 1000;
theMap.insert(Map::value_type(index, newOne));
index++;
}
--------
when printing out your map, your code as written assumes the One
class has an overloaded operator <<; you can also print the indiviudals members like so (note the accessing of the One object's members):
cout << endl << "The class "<< (*theIterator).first;
cout << endl << "The class "<< ((*theIterator).second).age << " | " << ((*theIterator).second).sal << endl ;
--
here's a cut and paste of my changes to your example:
i compile it but did not execute it, btw...
class One
{
public:
One() {age = -1; sal = -1;}; //ctor init of members
int age;
int sal;
protected:
private:
};
typedef map<int, one=""> Map;
int main()
{
Map theMap;
Map::iterator theIterator;
//Open the file
//Read each line of file and store in class variables
int index = 0;
while(!file.eof())
{
One newOne;
newOne.age =50;
newOne.sal = 1000;
theMap.insert(Map::value_type(index, newOne));
index++;
}
//to get the class
theIterator = theMap.find(0);
//Get the entire first record ?How should I achieve this which is stored in a class?
cout << endl << "The class "<< (*theIterator).first;
cout << endl << "The class "<< ((*theIterator).second).age << " | " << ((*theIterator).second).sal << endl ;
return 0;
}
sas
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my first posting had a cut and paste error in it;
the map declaration should look like:
typedef map<int, one=""> Map;
--
sas
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my cut and paste of the map declaration is getting
altered somehow; the angle brackets and template
parameters are getting stripped out.. wierd..
try paranthesis for visual sake
typedef map(int, One) Map
sas
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Does this help?
#include <iostream>
#include <map>
class ClassOne
{
public :
int age;
int sal;
} ;
typedef std::map<int, ClassOne> Map ;
int main()
{
Map theMap;
Map::iterator theIterator;
for ( int i = 0; i < 1000; ++i )
{
ClassOne one ;
one.age = 40 ;
one.sal = 1000 ;
theMap.insert ( Map::value_type ( i, one )) ;
}
theIterator = theMap.find(0);
if ( theIterator != theMap.end ())
{
std::cout << "The index " << (*theIterator).first << std::endl ;
std::cout << "The class, age = " << (*theIterator).second.age << ", sal = " << (*theIterator).second.sal << std::endl ;
}
return 0;
}
There are other ways to manage insertion, for instance,
>#include <iostream>
#include <map>
class ClassTwo
{
private :
int age;
int sal;
public :
ClassTwo () : age ( 0 ), sal ( 0 )
{
}
void Set ( int a, int s )
{
age = a ;
sal = s ;
}
int Age () const
{
return age ;
}
int Sal () const
{
return sal ;
}
} ;
typedef std::map<int, ClassTwo> Map ;
int _tmain(int argc, _TCHAR* argv[])
{
Map theMap;
Map::iterator theIterator;
for ( int i = 0; i < 1000; ++i )
{
std::pair<Map::iterator,bool> itp = theMap.insert ( Map::value_type ( i, ClassTwo ())) ;
if ( itp.second )
{
theIterator = itp.first ;
(*theIterator).second.Set ( 40, 1000 ) ;
}
}
theIterator = theMap.find(0);
if ( theIterator != theMap.end ())
{
std::cout << "The index " << (*theIterator).first << std::endl ;
std::cout << "The class, age = " << (*theIterator).second.age << ", sal = " << (*theIterator).second.sal << std::endl ;
}
return 0;
}
Paul
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The following is my code which use a IStream interface to dispaly JPEG.But after about 24 hours, an Assert error happened at NO.622 line in atlbase.h
//////////////////////////////////////////////////////////////////////////
IStream* pStream=NULL;
HGLOBAL hMemory=0;
BOOL bIsPicture ;
hMemory = ::GlobalAlloc( GMEM_MOVEABLE, iBufferLength );
ASSERT( hMemory != NULL );
LPVOID pData = ::GlobalLock( hMemory );
ASSERT( pData != NULL );
ASSERT(iBufferLength>=0);
memcpy(pData,buf,iBufferLength);
::GlobalUnlock(hMemory );
::CreateStreamOnHGlobal(hMemory,TRUE,&pStream );
ASSERT( pStream != NULL );
//here is other code
if(pStream)
{
pStream->Release();
}
if(hMemory)
{
::GlobalFree(hMemory);
hMemory=NULL;
}
please contact:
ctbpl_xiayi@yahoo.com.cn
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No idea where line 622 is. So I would suggest reading about "Return Values" and making proper use of them.
Todd Smith
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Hi there
The line 622 in atlbase.h is the -> operator of the CComQIPtr< > class template, and I don't see you are using any instance of it in the code you posted, so I suggest you to open the "Call stack" (Alt + 7) when you get the assert, and follow you way up until you reach the line in your code which is calling the -> operator on an instance of CComQIPtr<>, and then take a look why that pointer is NULL.
Regards,
Fabian
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A long time ago I came up with a bunch of COM interfaces that were all defined in one IDL file. I created a number of COM objects that supported those interfaces by having the object's IDL file include the first idl file. It worked. All was well with the world.
Now, I am trying to make some changes, so I created a Ixxxx2 interface that inherits from Ixxxx in that first IDL file. When I try to get my ATL object to inherit from Ixxxx2 I get compiler error C2504, base class undefined. I've compiled the new version of the IDL file. The new interface is defined exactly the same in the .h file as all the other older interfaces. What am I doing wrong?
Thanks,
Tim
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