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What error number does the try and catch get for the open?
Michael 
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After hr = pConn.CreateInstance(__uuidof(Connection));
the value of hr is -2147221008. I can't seem to get anything more from the _com_error object that is thrown except that the errormessage says "Invalid Pointer". I wonder if there could be something wrong with my compile options? 
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Did you use the CoInitialize()?
Cheers!!!
Carlos Antollini.
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Hi,
I have an SDI application that uses a CFormView. I have a third party graphics ActiveX control on the CFormView. I need to be able to scroll the CFormView because I want to make the ActiveX control bigger than the viewable area. Can someone help me with the steps to be able to scroll a CFormView?
Thanks for any help you can provide,
Craig
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Use CScrollView::ScrollToPosition. CFormView is derived from CScrollView.
Tomasz Sowinski -- http://www.shooltz.com
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Tomasz, thanks for the response. I'm trying to rubberband the image and I have a callback function that get's this message. Once I get this message, I find out the size of the zoomed view, if it's bigger than the current client area I need to use the scrollbars. Currently, I can't figure out how to make the scroll bars show up. If I try CSrollView::ScrollToPosition it throws an exception because there aren't any scroll bars visible.
Do you know how I can make the scroll bars show up?
Thanks again,
Craig
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That's excellent, thanks again for all your help.
Have a great day,
Craig
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Hi, I have a Home-Made control who post a message. This control can be placed anywhere. All of this stuff run very well but something is not like I wan't it to be and it's the first time I use Message queuing
void MyHomeMadeControl::AMethod(void)
{
PostMessage(GetParent(),
(UINT)this,
(long)&m_Var);
}
class CBoopView : public CView
{
//some stuff
MyHomeMadeControl m_Ctrl_1;
MyHomeMadeControl m_Ctrl_2;
//everything else
}
void CBoopView::OnZoomScroll(MyHomeMadeControl* WParam,MyHomeMadeParam* lParam)
{
if(&m_Ctrl_1 == WParam)
{
}
else
{
}
}
I don't think it's a very good way to do so...
It is possible in my PostMessage to do something like
PostMessage(GetParent(),
GetCurrentId(),
(long)&m_Var);
so that way I will used Id number instead of pointers...
thanks
(by the way if there is a "standart way to identify the Object who Post the message tell me)
Remi Morin
Rmorin@Operamail.com
Remi.Morin@Lyrtech.com
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Wrong, wrong, wrong. You're trying to use a parent window pointer as message identifier. This will not work.
#define WM_MY_MESSAGE (WM_USER + 1)
...
GetParent()->PostMessage(WM_MY_MESSAGE, someWparam, someLparam);
You can pass object pointer as wParam or lParam, as long as window that's going to process the message is in the same process. In your case it's true. There's another caveat: PostMessage places message in the queue. Receiving window will not get this message immediately - and depending on application, the object that you passed as message parameter may no longer exist. In such case, use SendMessage instead of PostMessage.
One final note: when you are using your controls only within this program, you may establish communication between windows without messages. Just cast the pointer returned by GetParent() to correct type and call whatever method you need:
CBoopView *pView = (CBoopView*)GetParent();
pView->Foo(param1, param2, param3);
Tomasz Sowinski -- http://www.shooltz.com
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Some difficulties to understand...
this is a sumary of my .h file
class MyHomeMadeControl :public CWnd
{
public:
MyHomeMadeControl ();
private:
virtual BOOL Create(const RECT& rect, CWnd* pParentWnd, UINT nID, CCreateContext* pContext = NULL);
public:
virtual ~MyHomeMadeControl ();
protected:
afx_msg void OnPaint();
afx_msg void OnTimer(UINT nIDEvent);
DECLARE_MESSAGE_MAP()
};
static UINT WM_ON_TIMER_HOMEMADE= RegisterWindowMessage("MyHomeMadeControl_OnTimer");
and then the function on timer in the cpp file:
void CGraphScroll::OnTimer(UINT nIDEvent)
{
//here to ba able to import this code anywhere I have to do something like this
GetParent()->PostMessage(WM_ON_TIMER_HOMEMADE,(UINT)this,something);
/*this will require a #include "parent.h" witch I don't know
((CBoopView)GetParent())->OnTimer(Anything I want)
*/
}
So in a boopView (who can be a any kind of CWnd derived class) I have to trap this message, and I can have 0 to n instance of MyHomeMadeControl.
So for catch the message what I did work, but it's very strange... for a CButton It work very well and it's done like this
ON_BN_CLICKED(IDC_BUTTONX, OnButtonX)
ON_BN_CLICKED is a macro and it will be replace by
ON_CONTROL(BN_CLICKED, IDC_BUTTONX, OnButtonX)
it's exactly what I wan't to re-create with my Home made control, no matter how many of them exist, any of them will find whitch handler to use...
ON_CONTROL(WM_ON_TIMER_HOMEMADE,IDC_MYHOME_MADE_CONTROL_1,OnTimerControl_1)
ON_CONTROL(WM_ON_TIMER_HOMEMADE,IDC_MYHOME_MADE_CONTROL_2,OnTimerControl_2)
this doesn't work...
Remi Morin
Rmorin@Operamail.com
Remi.Morin@Lyrtech.com
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So your control is designed to be a child of any parent and you want to use ON_CONTROL? It's easy: just remember that you need to call SendMessage rather than PostMessage (there's no need to use a queue). Control notifies its parent by sending one of two messages: WM_COMMAND or WM_NOTIFY.
In 16-bit Windows there was only WM_COMMAND, that's why edit, listbox, button and other 'old' controls use this method. OTOH, common controls that made their debut in 32-bit Windows, like listview, treeview, toolbar etc. use WM_NOTIFY. I'd suggest to use WM_NOTIFY as a method of communitaction between the control and any parent window. Use the following code to notify the parent about some event. Note the NM_SOMEEVENT - this is just a unsigned integer number that your parent needs to know. There's no need to use RegisterMessage in this scenario.
NMHDR hdr = { m_hWnd, ::GetWindowLong(m_hWnd, GWL_ID), NM_SOMEEVENT };
GetParent()->SendMessage(WM_NOTIFY, hdr.idFrom, (LPARAM)&hdr);
Parent will get WM_NOTIFY. MFC magic routes this message through message map. Use ON_NOTIFY to insert the handler into msgmap of parent window:
ON_NOTIFY(NM_SOMEEVENT, IDC_MYHOME_MADE_CONTROL_1, OnSomeEvent)
More details in MSDN, just search for WM_NOTIFY and ON_NOTIFY.
Tomasz Sowinski -- http://www.shooltz.com
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thanks, it work very well
So it's the way to do that
but question, this structure take all my parameters so in my method (OnSomeEvent in you'r example) I have to call a method like
m_cMyHomeMadeControl.GetCurrentValues(all parameters I wan't)
it's a good way (the parent have to know what is his child)
Remi Morin
Rmorin@Operamail.com
Remi.Morin@Lyrtech.com
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Calling child directly is one possibility. However, you could also easily add your own information. Just derive some struct from NMHDR:
struct MyNotifyInfo : public NMHDR
{
int yourMember1;
char yourMember2[100];
};
You could also create struct with NMHDR as first member:
struct MyNotifyInfo
{
NMHDR nmhdr;
int yourMember1;
char yourMember2[100];
};
The second method is used by Windows SDK - these header files must be compilable even in plain old C which doesn't support inheritance. Have a look at MSDN docs for NMTREEVIEW, NMLISTVIEW or any struct named NMxxxx.
In the parent's handler, just cast NMHDR* to MyNotifyInfo* and you'll be OK.
Tomasz Sowinski -- http://www.shooltz.com
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last question...
NMHDR hdr = { m_hWnd, ::GetWindowLong(m_hWnd, GWL_ID), NM_SOMEEVENT };
NM_SOMEEVENT - There's no need to use RegisterMessage in this scenario...
I can use any value?? 0 to maximum unsigned int?
does it can be in conflict whit parent event? or (as I think) only whit MyHomeMadeControl event (in witch case it is easy to avoid)
...
thank you very much for you'r help, it's easy to do code whitout bother whit anything... but take care of everything in a windows program is very hard and good book are not easy to find. Thank you very much
Remi Morin
Rmorin@Operamail.com
Remi.Morin@Lyrtech.com
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There's no possibility of the conflict. Parent's handler will be called only if both conditions are true:
1) code member of NMHDR is equal to 1st parameter of ON_NOTIFY
2) idFrom member of NMHDR is equal to 2dn parameter of ON_NOTIFY
In fact, you can use any value as code. However, it would be a good practice to avoid range of codes starting with NM_FIRST and NM_LAST. In this range you'll find some general-purpose codes, like NM_CLICK. I think you should use NM_LAST+1, NM_LAST+2 etc. for your notification codes.
Tomasz Sowinski -- http://www.shooltz.com
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I have a problem and I don't know what to do !!!! I'm trying to learn but the compiler don't help me !!!!
My code:
#import "msado15.dll" no_namespace rename( "EOF", "adoEOF" )
#import "msadox.dll"
And I get:
msadox.tlh(98) : error C2011: '_Collection' : 'struct' type redefinition
(... Thousands of sentences like the one above ...)
What am I doing wrong ??? Why is redefiniting everything if they're different libraries ??? What sould I do ????
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I don't know, I'm using the same line than you to load msado15.dll but i don't have this problem.
you can try this (maybe you import it more than once
#if !defined __MY_IMPORT_OF_MSADO15_DLL__
#define __MY_IMPORT_OF_MSADO15_DLL__
#import "msado15.dll" no_namespace rename( "EOF", "adoEOF" )
#endif
Remi Morin
Rmorin@Operamail.com
Remi.Morin@Lyrtech.com
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No, it's not that !!!!
The problem is that msadox.dll and msado15.dll have some of the same collections defined and this is why they get redefined !!!!! How can I solve it ??????
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Import the dlls in diferent Files.
Use the ado functions in a file, and the adox functions in other one.
Cheers!!!
Carlos Antollini.
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Yes, if I use that everything goes OK, but the problem is that I have two classes (one using msado15.dll and the other using msadox.dll) and I want them to share the connection, so I thought of passing the ConnectionPtr from one class to the other. Otherwise, I've to do two different connections to the same source and It's not very efficient.
I found this in msdn:
// BeginCloseConnectionCpp
#import "c:\Program Files\Common Files\system\ado\msadox.dll" \
no_namespace
#import "c:\Program Files\Common Files\system\ado\msado15.dll"
and in a function:
m_pCatalog->PutActiveConnection(_variant_t((IDispatch *)m_pCnn));
where m_pCnn is a ConnectionPtr
That's what I want to do !!!!!
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CString strTest;
strTest.LoadString(IDS_Test); // IDS_Test == "Hello, world!"
cout << strTest << "\n";
output: "0077046C"
this is not exactly what i expected...can somebody help?
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This code comes from VC++ Wizard, Console App with MFC support
CString strHello;
strHello.LoadString(IDS_HELLO);
cout << (LPCTSTR)strHello << endl;
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ok, and what does (LPCTSTR) in front of "strHello" means?
to convert the string into that type?
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It means that you should pick up a book and read.
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