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You shouldn't "lose" the DC when drawing. You should *ONLY* draw in the OnPaint or OnDraw methods of MFC (or in response to WM_PAINT messages if your doing SDK development). You shouldn't be drawing at any other time.
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Hello!
I have an SDI application with a FormView. On OnInitialUpdate() I do this:
CFormView::OnInitialUpdate();
GetParentFrame()->RecalcLayout();
ResizeParentToFit();
To get the size of the window so that only the controls are visable. This works very well, but now I want to start the program minimized. then the above will not work, and I get a standard sized window with my controls in the upper left corner.
How do I get the resized window when I start the app minimized?
// Mike
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Hi Mike,
I just want to guess a solution. In fact, i dont know if it works or not.
Call the following lines in OnInitialUpdate()
CFormView::OnInitialUpdate();
GetParentFrame()->RecalcLayout();
ResizeParentToFit();
ShowWindow(SW_MINIMIZED)
I hope this works!
Best regards
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Hello!
Thank for your reply! unfortunally it didn't work. I've change the ShowWindow(..) to theApp.GetMainWnd()->ShowWindow(SW_SHOWMINIMIZED); The first variant only minimized the view.
But somewhere in MFC there is a call to OnSize which makes my app to restore directly.
I have to come up with some clever scheme to only restore when the user clicks on the icon and not when MFC resizes the window.
All ideas are wellcome!
// Anders
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Hi,
i have found an article in the MSDN how to make an Win32-application (without MFC) which
is based on a dialog. But the article and the example source code is for Win 3.1 and doesn't
work with Win32.
Does anyone of you have a skeleton app which is based on a dialog? A link to a
tutorial would be fine, too.
Thanks,
Chris
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Saying "doesn't work with Win32" is quite vague.
There is an abundance of SDK (no MFC) samples provided with Visual C++.
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Yes, you are right, sorry. I should have said:
"doesn't work with the Platform SDK without MFC."
I have found an article in the MSDN about my problem, but it was from 1996 for Win 3.1.
But i have found the solution nevertheless, it was in my DialogBox() call. I wasn't
specifying the resource correctly.
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Here is the short version: I have several classes, some templatized, that inherit from a common abstract base class. I want a way to check at run-time whether a pointer points to an object that inherits from the base class. Because I am using templates, I can't use the MFC IsKindOf().
I have several templatized classes that derive from an abstract base class, following the GoF Bridge pattern:
<br />
class AbstractDataItem<br />
{<br />
public:<br />
virtual ~AbstractDataItem() = 0;
};<br />
<br />
template<class Ty_> class ConcreteDataItem :<br />
public AbstractDataItem<br />
{<br />
public:<br />
virtual ~ConcreteDataItem();<br />
}<br />
<br />
class SpectrogramDataItem :<br />
public AbstractDataItem<br />
{<br />
public:<br />
virtual ~SpectrogramDataItem();<br />
}<br />
This summarizes the inheritance structure. Now I have a pointer and I want to check whether it points to something that inherits from AbstractDataItem. Because I am using templates, I cannot have AbstractDataItem inherit from CObject and use DECLARE_DYNAMIC/IMPLEMENT_DYNAMIC and use MFC's IsKindOf().
The standard C++ typeid() function seems only to give me the top-level class and does not provide a way to check forinheritance. I could try dynamic_cast<> and catch exceptions, but there is an awful lot of overhead in that and it's ugly.
I could exhaustively check the typeid against a list of derived classes, but that would kill my ability to subclass existing classes in the hierarchy---I'd have to go back in and rewrite my inheritance-testing list.
It would be nice if I didn't have to completely rewrite my own version of MFC's CObject and CRuntimeClass to handle templates and namespaces.
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Basically, dynamic_cast<> is your best bet.
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Hi,
I have tried to connect to SQL Server database using ASO , I used the example from the MSDN but faced a problem with the name spaces can some one give me the detailed sequence of operations to connect to a database and retrieve data.
Thank
Kalyan
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Hello!
I'm NO expert but I seem to recall that you need to import ado like this:
In stdafx.h
#import "c:\program files\common files\system\ado\msado15.dll" no_namespaces rename("EOF" "adoEOF")
// Mike
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I have made a program that has a toolbar. When I run the program on my computer it runs normally but when I try to execute it on other pc a GPF occurs (fail on comctl32.dll) and the program shutdowns.
My os is Win 95 C and I use the compiler borland 5.5.
Any possible solution is welcome.
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Sounds like the other machine has an older version of COMCTL32.DLL than on your dev machine. Various structures have changed in the revs of the common controls. Grab a COMCTL32 updater from MS and install that on the other machine.
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Where in the MFC libraries or a source code archive can I find the equivalents to FileListBox,
DirListBox and DriveListBox?
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What's wrong with the follwing code?
//Header file...
class CSubclassWnd : public CWnd
{
private:
HWND m_hwnd;
BOOL m_bIsSubclassed;
static WNDPROC m_oldWndProc;
public:
CSubclassWnd();
~CSubclassWnd();
BOOL CaptureWindow(HWND hWnd);
void ReleaseWindow();
inline BOOL IsSubclassed(){return m_bIsSubclassed;}
static LRESULT CALLBACK WindowProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam);
};
//Implementation file...
CSubclassWnd::CSubclassWnd()
{
m_bIsSubclassed=FALSE;
}
CSubclassWnd::~CSubclassWnd()
{
ReleaseWindow();
}
BOOL CSubclassWnd::CaptureWindow(HWND hWnd)
{
m_oldWndProc=(WNDPROC)::SetWindowLong(hWnd, GWL_WNDPROC, (LONG)WindowProc);
if (m_oldWndProc!=0)
{
m_hwnd=hWnd;
m_bIsSubclassed=TRUE;
return TRUE;
}
return FALSE;
}
void CSubclassWnd::ReleaseWindow()
{
if (m_bIsSubclassed)
{
m_bIsSubclassed=FALSE;
::SetWindowLong(m_hwnd, GWL_WNDPROC, (LONG)m_oldWndProc);
}
}
LRESULT CALLBACK CSubclassWnd::WindowProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
if (message==WM_MOVING)
MessageBeep((UINT)-1);
return ::CallWindowProc(m_oldWndProc, hWnd, message, wParam, lParam);
}
When I compile the above, I get the following error:
error LNK2001: unresolved external symbol "private: static long (__stdcall* CSubclassWnd::m_oldWndProc)(struct HWND__ *,unsigned int,unsigned int,long)" (?m_oldWndProc@CSubclassWnd@@0P6GJPAUHWND__@@IIJ@ZA)
Any ideas? Thanks in advance.
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m_oldWndProc is a static member and needs to be initialized outside the class definition, typically in the .cpp file.
Something like this:
WNDPROC CSubclassWnd::m_oldWndProc = NULL;
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Thanks for the tip. I'll give it a whirl.
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Have you subclassed windows without using MFC? If so, then you probably know more than I do, but based on my understanding of MFC, most of what you are doing is unnecessary with MFC.
What is the value of having m_hwnd in your CSubclassWnd class? I guess that since it is spelled differently from CWnd::m_hWnd, it is less likely to be confusing, but it seems unnecessary to me.
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I'm not sure that there WAS a purpose. When I wrote the class, I did so very quickly, and honestly didn't give it much thought other than the subclassing work. I've actually done a lot of subclassing using C and the Win32 API, which is not that difficult; nothing is wrapped. However, I've never really tried to subclass from within a class structure, and therein lies my confusion.
Apparently, you have to declare your subclass function as 'static' if you intend to use it for subclassing. The problem with that is that functions declared as static remove the 'this' pointer, and they can only reference variables and methods that are also declared as 'static'. Not acceptable in my app, because I use the 'this' pointer in some of my methods.
So, what I actually did was deleted the CSubclassWnd class, then added the subclass function and OldWndProc variable to my classes .cpp file, outside of any classes (before any 'class' keywords). Sure, that makes them global, but it works, and I have the functionality that I need.
Thanks all for the help. I'll keep this all in mind for future projects. 
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Yes, you have to declare your subclass function as 'static' if you intend to use it for subclassing. It is the fact that functions declared as static remove the 'this' pointer that makes it possible for Windows to call a function in your class. Think about what Windows is doing when it calls your callback function. Windows calls your function with certain parameters; a "this" pointer is not one of the parameters. Think about that and I think you will realize why the function must be static.
Whatever functionality that you need, almost for sure there is an easier way to do it if you do it the MFC way instead of trying to get around MFC.
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How to add a ToolBar on a dialog form...
please help me...
or. mabe how to add a dialog as a normal MDI program..
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Hi All,
Is it possible to set the host type for
CFtpConnection ?
The problem is:
the remote system has diffrent OSs.
I need to connect MVS part, but the default host
type seems to be UNIX.
P.S. I would prefer not to use CSocket and other low-level
stuff like that.
Yours sincerely,
Alexander Chaikin
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Alexander,
I'm not quite sure what difficulty you are having. The FTP protocol specifies that all devices, client and server, must adhere to very strict communication standards. These standards among other things specify that all terminal interaction over the control channel must be in NVT (Network virtual terminal), and things like directory listings should be displayed in a format similar to Unix.
So, that said, your MVS connection shouldn't affect your ability to upload and download files, or display directories. If you are of course downloading files, they could very well be unreadable.
Could you explain for me what you're getting?
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Alex,
I got your response via email, but it doesn't seem to be on the board (bug Chris/Uwe)?
It sounded from the tone of your email that you'd found a solution; have you?
Even though MVS supports a different file naming convention, the FTP server implementation is still responsible to display directories in the standard FTP (Unix) format. The FTP server under Windows has the ability to display directories in MS-DOS or Unix format, but if you set it to anything other than Unix, none of the Windows (automated) ftp programs will work correctly.
So, I think you've got two choices. a) try and figure out how to get your MVS system to display directories the correct way (there may be a command you can enter), or b) get some FTP sourcecode and start making some customizations.
I think everyone knows that we sell the Dundas TCP/IP source code, but if you are not worried about licensing issues, warranties, etc., you might have a look at some of the free code available here and at CodeGuru.
Someone correct me if I'm wrong, but I think PJ's ftp stuff is written to use the Wininet stuff (which CFTPConnection wraps).
Hope that helps.
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