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If you (publicly) derive from the base class, you should have access to all protected members of the base class from your derived class. So the start of your class definiton should look like
class MyClass : public CSplitterWnd
If you have a protected in this line instead of the public, it will not work. Also the access will only be available from your derived class, not from any other class that uses an instance of the derived class.
The good thing about pessimism is, that you are always either right or pleasently surprised.
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Thanks,
you found the problem. My splitter is derived from CMDIChildWnd.
I am not sure why, but it works as a splitter OK.
And since I am still using VC6.0 MFC multiple inheritance should work, but that is a ton of work to remove all the ambiguities...
I was going to use HitTest to maximize selected pane, so I better stick with moving splitter bars.
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HitTest is not a function that you call using the instance of a class.
Rather, it is a virtual function that you can override, so that the MFC framework can call it using a base class object reference.
There are other similar virtual functions like OnInitDialog for example.
From the HitTest override, you simply check the point passed in and return one of the HTXXX values.
For example, to move a dialog by clicking and dragging anywhere on it, just like its caption, you simply return HTCAPTION from the overridden HitTest method of the CDialog derived class.
This is how it will be called internally -
class CMyFramework
{
public:
void foo() { this->bar(); }
protected:
virtual void bar() { }
};
class COne : public CMyFramework { };
class CTwo : public COne { };
class CTen : public CNine
{
protected:
virtual void bar()
{
cout << "MyBar" << endl;
}
};
The framework simply calls the CMyFramework::foo method and it will call CTen::bar because it is virtual.
«_Superman_»
I love work. It gives me something to do between weekends.
Microsoft MVP (Visual C++) (October 2009 - September 2013) Polymorphism in C
modified 10-Mar-14 11:31am.
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Standard MFC MDI adds new view(s) to “Window” menu submenu.
Could someone give me a hint how is it accomplished when the application starts?
I am little familiar with dynamic menu / submenu operation but I cannot find how it gets started in creation of submenu under “Window” menu item. I did not get very far tracing the creation of the main frame.
Any help will be as always appreciated.
Cheers
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Thanks Richard,
I know about InsertMenuItem, I was looking for where in the initial setup is it used and I found it.
As far as CTabbedPane I have made two decisions - if I get an income from my programming hobby I'll spring for the latest MS VS or I'll ditch my VC6.0 and start over using Linux.
Just for illustration - I did checked MS site for "2013 requirements" and my IE locked up. Unless I am wrong - MS express / semifree stuff does not come with MFC.
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True, MFC is not provided free with the Express editions. However, if you decide to switch to C# you get the complete .NET development library, which provides everything that MFC does, and more.
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But ... don't I have to "upgrade" to windows x.y to keep the .NET current? If so it is still spending $ on this hobby which I could use on bying beer.
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Your choice, of course. Stick with whichever technology you prefer.
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Hi, if Key-Value pairs are like:
40000 "40000 is a first number"
41020 "41020 is a second number"
....
use CMapStringToString or CMap<int,int,string,string> to store.
Then which one is better in look up efficiency?
CMapStringToString ｏｒ CMap<int,int,string,string>
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econy wrote: Then which one is better in look up efficiency?
I don't know, but I cannot imagine having to convert between ints and CStrings just to use the CMapStringToString could possibly be worth it, I would start with the CMap.
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Why don't you test that?
Veni, vidi, vici.
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Lookup requires comparing keys, i. e. calling the operator < and maybe operator ==. Since these operators are more efficient for ints than they are for strings, I suspect that CMap is better. However, the rest of the looking-up algorithm that does not involve comparing keys may play a much more significant role on performance overall, so you might not notice a difference.
You should also consider whether there are other operations than looking up which are called often, e. g. insertion, removal, converting keys to different formats, etc.: E. g. if you spend a lot of time reading keys from a text source or writing them as text, then it may be advisable to just stick with string keys rather than converting them back and forth all the time!
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Hi
I got handle to Grid Control of window of another ( external ) application. Used EnumChildWindows for getting child window handle.
But I am unable to read text from that grid control.
Can anyone provide any pointers for this ? Thanks in Advance.
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The WM_GETTEXT message will only return the text of the window whose handle you provide. It will not include the content of child windows, as exist in a grid control.
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Hi, am building a GUI MFC application, I have several toolbars in my application, i want my toolbars to auto align according to my application frame width, the code i have been tried is given below. By this code the toolbar is simply align in a single row. what should i do to reach my goal? thanks in advance
m_wndMenuBar.EnableDocking(CBRS_ALIGN_ANY);
tb1.EnableDocking(CBRS_ALIGN_ANY);
m_wndToolBar.EnableDocking(CBRS_ALIGN_ANY);
tb4.EnableDocking(CBRS_ALIGN_ANY);
tb8.EnableDocking(CBRS_ALIGN_ANY);
tb9.EnableDocking(CBRS_ALIGN_ANY);
tb2.EnableDocking(CBRS_ALIGN_ANY);
tb3.EnableDocking(CBRS_ALIGN_ANY);
tb6.EnableDocking(CBRS_ALIGN_ANY);
tb7.EnableDocki:confused:ng(CBRS_ALIGN_ANY);
EnableDocking(CBRS_ALIGN_ANY);
DockPane(&m_wndMenuBar);
DockPane(&tb9);
DockPaneLeftOf(&tb8, &tb9);
DockPaneLeftOf(&tb4, &tb8);
DockPaneLeftOf(&m_wndToolBar, &tb4);
DockPaneLeftOf(&tb1, &m_wndToolBar);
DockPaneLeftOf(&tb7, &tb1);
DockPaneLeftOf(&tb6, &tb7);
DockPaneLeftOf(&tb3, &tb6);
DockPaneLeftOf(&tb2, &tb3);
A learner
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Your intention is not totally clear, can you try and explain better what you are trying to do and what is not working ?
~RaGE();
I think words like 'destiny' are a way of trying to find order where none exists. - Christian Graus
Entropy isn't what is used to.
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Another comment:
Is your toolbar CMFCToolbar ?
From MSDN: http://msdn.microsoft.com/en-us/library/cc665920.aspx[^]
This method (EnableDocking) extends the base class implementation, CBasePane::EnableDocking, by setting the CBasePane::m_dwControlBarStyle data member to AFX_CBRS_FLOAT. This method then passes dwAlignment to the base class implementation.
Maybe you would need the AFX_CBRS_RESIZE as well, see here in the base class:
http://msdn.microsoft.com/en-us/library/cc701911.aspx[^]
~RaGE();
I think words like 'destiny' are a way of trying to find order where none exists. - Christian Graus
Entropy isn't what it used to.
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Yes am using CMFCToolbar, i have already checked with palette sample and EnableDocking();, they didnt help me  i will attach the code i have tried for docking the toolbar
m_wndMenuBar.EnableDocking(CBRS_ALIGN_ANY);
m_wndToolBar.EnableDocking(CBRS_ALIGN_ANY);
tb1.EnableDocking(CBRS_ALIGN_ANY);
tb2.EnableDocking(CBRS_ALIGN_ANY);
tb3.EnableDocking(CBRS_ALIGN_ANY);
tb4.EnableDocking(CBRS_ALIGN_ANY);
tb6.EnableDocking(CBRS_ALIGN_ANY);
tb7.EnableDocking(CBRS_ALIGN_ANY);
tb8.EnableDocking(CBRS_ALIGN_ANY);
tb9.EnableDocking(CBRS_ALIGN_ANY);
EnableDocking(CBRS_ALIGN_ANY);
DockPane(&m_wndMenuBar);
DockPane(&tb1);
DockPane(&m_wndToolBar);
DockPane(&tb4);
DockPane(&tb8);
DockPane(&tb9);
DockPane(&tb7);
DockPane(&tb3);
DockPane(&tb6);
DockPane(&tb2);
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Hello everybody,
I am playing with LibSDL and tried to use smart pointers for some of the objects created by the Library (i.E. SDL_CreateWindow returns a SDL_Window* which I would like to put into a std::shared_ptr<sdl_window>). For the rest of the post I will simple refer to SDL_Window but the same applies to other SDL objects.
The SDL_Window structure in the SDL header is a forward declaration for a simple structure without a destructor (plain old data) but there is a function called SDL_DestroyWindow which destroyes the SDL_Window and frees the allocated memory.
I use the following code to declare and initialize my smart pointer:
std::shared_ptr<SDL_Window> window(
SDL_CreateWindow( "Title", 0, 0, 640, 480, SDL_WINDOW_SHOWN ),
SDL_DestroyWindow
);
Now if I assign a nullptr to the initialized shared_ptr I get warning C4150 for deleting a pointer to the undefined or incomplete type SDL_Window but the SDL_DestroyWindow function gets called.
Am I doing something wrong or will I have to ignore this warning?
Thank you for your help,
Andreas
modified 7-Mar-14 14:40pm.
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The warning is probably because of the forward declaration.
Look at the documentation - Compiler Warning (level 2) C4150[^]
«_Superman_»
I love work. It gives me something to do between weekends.
Microsoft MVP (Visual C++) (October 2009 - September 2013) Polymorphism in C
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Hi!
I am sure the forward declaration is the problem because you cannot delete a forward declarated type. The compiler simply does not know if it has the call a destructor if it has not been declared.
But what I do not understand is why I get the warning if I supply a custom deleter. In this case the default delete (and therefor class destructor) should not be used by the shared_ptr template. If the last shared_ptr runs out of context it simply calls the provided custom deleter (which should know the full definition for the class it is deleting)
Thank you for your response, but it does not hit the mark.
However, I have found the problem (and the resolution) which I will explain in my next post.
Andreas
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Hello again,
I now know what is causing the "problem" and will explain it.
Example code:
class MyIncompleteType; // forward declaration
std::shared_ptr<MyIncompleteType> y(myAllocate(), myFree);
y.reset(); // this works without warning (and calls myFree)
y = nullptr; // this gives me warning C4150
The second parameter to the shared_ptr constructor (myFree) is used to create a specialized a custom deleter template which calles myFree if the object pointed to by shared_ptr has to be deleted.
y.reset(); invokes the custom delimiter and sets the shared_ptr to empty (which is
y = nullptr; initialized the shared_ptr with a new pointer to an object uf MyIncompleteType which is actually nullptr, but a standard deleter is created which causes to C4150 warning because it would delete the object using 'delete' (which is not going to happen because the new pointer is nullptr).
So if you have to reset a shared_ptr of an incomplete type you simply have to use the reset() method.
Assigning a new value to the shared_ptr will also assign a new deleter and if you assign a nullptr it will be boxed and the shared_ptr created will use a default deleter which causes the warning C4150.
Andreas
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