C / C++ / MFC Discussion Boards

jhwurmbach13-Jul-07 1:40

13-Jul-07 1:40

You don't tell enough to get a solution to your problem.
What are you trying to accomplish and why can't this be solved in another way?
Does the (Microsoft specific) _variant_t help you?

Failure is not an option - it's built right in.

Re: How can I create a generic pointer?

xonobo13-Jul-07 4:19

xonobo

13-Jul-07 4:19

Thamks for your help. I thought VARIANT is only available in VB that's why I asked more. Now I will check _variant_t. Thanks again.

Re: How can I create a generic pointer?

David Crow13-Jul-07 4:25

David Crow

13-Jul-07 4:25

xonobo wrote:
I thought VARIANT is only available in VB...

It's definitely not limited to VB.

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Re: How can I create a generic pointer?

Stephen Hewitt15-Jul-07 13:55

Stephen Hewitt

15-Jul-07 13:55

Try http://www.boost.org/doc/html/variant.html[^] and http://www.boost.org/doc/html/any.html[^].

Steve

maximizing window in MFC application

minkowski12-Jul-07 22:18

minkowski

12-Jul-07 22:18

Hi,

I have a MFC application and wish to change the way the application behaves when a user maximises the main window frame. I understand that I need to add a virtual function to the document class that inherits from the CDocument class. However, I am not sure what the name of the function is that is used when maximising the window. If you can tell me, that would be great.

Thanks !

Re: maximizing window in MFC application

Sam_c12-Jul-07 22:38

Sam_c

12-Jul-07 22:38

the OnSize function takes UINT which identifies the minimise or maximise request.
that how ever is in MainFrm and View not Doc

example of an action based on minimised action.

void CMainFrame::OnSize(UINT nType, int cx, int cy)<br />
{<br />
	if(nType == SIZE_MINIMIZED)<br />
	{<br />
		ShowWindow(SW_HIDE);<br />
	}<br />
	else<br />
	{<br />
		CFrameWnd::OnSize(nType, cx, cy);<br />
	}<br />
}

hope that helps.
if im wrong about the document OnSize let me know please Smile | :)

Re: maximizing window in MFC application

minkowski12-Jul-07 23:17

minkowski

12-Jul-07 23:17

Hi ya,

Thanks for your post. I actually found this

<br />
<br />
void CMainFrame::OnGetMinMaxInfo(MINMAXINFO FAR* lpMMI) <br />
{<br />
	// kiran.<br />
	static const CPoint point0 = CPoint(0, 0);<br />
	if(m_PageSize != point0)<br />
	{<br />
		const long my = lpMMI -> ptMaxSize.y;<br />
		const long ty = lpMMI -> ptMaxTrackSize.y;<br />
		lpMMI -> ptMaxSize = m_PageSize;	<br />
		lpMMI -> ptMaxTrackSize = m_PageSize;<br />
		lpMMI -> ptMaxSize.y = my;<br />
		lpMMI -> ptMaxTrackSize.y = ty;<br />
	}<br />
<br />
	CFrameWnd::OnGetMinMaxInfo(lpMMI);<br />
}<br />
<br />

in my code and put a break point on it when I clicked the maximise button. The code then stopped at the break point proving that this function is invoked when using max / min. I guess the structure should contain info whether the user is doing a max / min ?

Thanks

Re: maximizing window in MFC application

David Crow13-Jul-07 4:29

David Crow

13-Jul-07 4:29

minkowski wrote:
...proving that this function is invoked when using max / min.

True, but that does not mean it is the only function involved in such a request. The WM_GETMINMAXINFO message is sent to a window when the size or position of the window is about to change. You can handle this message to override the window's default maximized size and position, or its default minimum or maximum tracking size.

The WM_SIZE message is sent to a window after its size has changed. Given your request of, "...change the way the application behaves when a user maximises the main window frame.", I'd opt for handling this message.

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Re: maximizing window in MFC application

baerten12-Jul-07 23:43

baerten

12-Jul-07 23:43

I NEVER TRIED, but you can test to handle the WM_ONSIZE Message
There you get the UINT nType, which you can test on if(nType == SIZE_MEXIMIZED)

I hope it's true what i say Laugh | :laugh:

Good luck

Re: maximizing window in MFC application

minkowski13-Jul-07 0:23

minkowski

13-Jul-07 0:23

Hi

Yes, I am sure what you suggested will work (am implementing it now) as I found this example

<br />
<br />
   void CMainFrame::OnSize(UINT nType, int cx, int cy)<br />
   {<br />
      CFrameWnd::OnSize(nType, cx, cy);<br />
      CMenu* pmenu = GetMenu();<br />
<br />
      if (nType == SIZE_MAXIMIZED)<br />
          pmenu->EnableMenuItem(ID_FREEZE, MF_DISABLED|MF_GRAYED);<br />
      else<br />
          pmenu->EnableMenuItem(ID_FREEZE, MF_ENABLED);<br />
<br />
       Draw<br />
}<br />
<br />

Thanks for your suggestion.

Is anybody know any free unicode xml lib/classes?

Peter, Chan12-Jul-07 22:08

Peter, Chan

12-Jul-07 22:08

Is anybody know any free unicode xml lib/classes I can use?

Re: Is anybody know any free unicode xml lib/classes?

Stephen Hewitt12-Jul-07 22:15

Stephen Hewitt

12-Jul-07 22:15

What about using MSXML?

Steve

Re: Is anybody know any free unicode xml lib/classes?

jhwurmbach12-Jul-07 22:47

jhwurmbach

12-Jul-07 22:47

TinyXML[^]
CMarkup[^]

Failure is not an option - it's built right in.

Re: Is anybody know any free unicode xml lib/classes?

Nemanja Trifunovic13-Jul-07 2:23

Nemanja Trifunovic

13-Jul-07 2:23

Apache Xerces[^]

Programming Blog
utf8-cpp

parallel port related problem

rajbhansingh12-Jul-07 21:26

rajbhansingh

12-Jul-07 21:26

hi i m using inp32 and out32 function with inpout32 dll, when i read data status and control register of parallel port inp32 function return a value that i stored in a variable all the pin of parallel port have 5V current,now i am connect all the pins one by one to ground i find change in the value of status register but not in the control register,how can i get this.my computer is celeron,but when i did this on p4 i find the change, how can i do this on celeron ,i also enable ECP mode of parallel port but could not get requored result

hi

Re: parallel port related problem

Rage13-Jul-07 1:12

Rage

13-Jul-07 1:12

hi i think you should get you the documentation of the celeron chip to find which control registers should be set and what are the other requirements for them to be set to 0V when you shortcut them (maybe you need 2 lines somewhere) the fact that it worked on the p4 proves it is only a problem either of hardware or of how the functions are interacting with it and if you have a bit of time remaining learn punctuation.

http://www.readytogiveup.com/[^] - Do something special today.

How to inherit a MFC class.

chaitannya_m12-Jul-07 20:07

chaitannya_m

12-Jul-07 20:07

Hi everyone,

In my application i am using a hell lot no. of list controls. So i have defined a CCustomListCtrl class derived from CListCtrl class. I have defined the NM and WM functionalities and other stuff in it and it runs just the way i want it. Now i want to define rest of the class derived from CCustomListCtrl. When i do this compiler gives an error

unresolved external symbol "public: virtual int __thiscall CCustomList::PreTranslateMessage(struct tagMSG *)" (?PreTranslateMessage@CCustomList@@UAEHPAUtagMSG@@@Z)

All the errors are related to the WM and NM .I guess the problem is in

BEGIN_MESSAGE_MAP(CCustomListCtrl, CListCtrl) macro. How do i remove this error.

Re: How to inherit a MFC class.

baerten12-Jul-07 21:28

baerten

12-Jul-07 21:28

Hi,

could you please post some code, so that we see how you define the rest of the class

Regards

Re: How to inherit a MFC class.

sps-itsec4612-Jul-07 22:41

sps-itsec46

12-Jul-07 22:41

It's not really much info you posted but check if the declaration and definition of the method PreTranslateMessage() is correct.

When I look at your BEGIN_MESSAGE_MAP macro your class seems to be called CCustomListCtrl but the definition of PreTranslateMessage() contains a class named CCustomList:

CCustomList::PreTranslateMessage(struct tagMSG *)

cheers,
mykel

OMM: "Let us be thankful we have an occupation to fill. Work hard, increase production, prevent accidents and be happy."

Re: How to inherit a MFC class.

chaitannya_m13-Jul-07 0:07

chaitannya_m

13-Jul-07 0:07

Hey thanks.. Great observation ...!!!

the error was there.. There was another class CCustomList which i delete because i completely messed up with.. Code is working fine now

Re: How to inherit a MFC class.

sps-itsec4613-Jul-07 1:18

sps-itsec46

13-Jul-07 1:18

You're welcome! Perhaps next time use search and replace when you rename your classes... Poke tongue | ;-P

cheers,
mykel

OMM: "Let us be thankful we have an occupation to fill. Work hard, increase production, prevent accidents and be happy."

Re: How to inherit a MFC class.

Sam_c12-Jul-07 22:47

Sam_c

12-Jul-07 22:47

class to message map is incorrect

CCustomListCrtl <- Message map

CCustomList <- Class

this could be the problem Smile | :)

if it isnt a bit more code would help thanks Smile | :)

Re: How to inherit a MFC class.

jhwurmbach12-Jul-07 23:11

jhwurmbach

12-Jul-07 23:11

chaitannya_m wrote:
BEGIN_MESSAGE_MAP(CCustomListCtrl, CListCtrl)

The Syntax here is
BEGIN_MESSAGE_MAP(Classname, Baseclassname)

Did you turn it around?

Failure is not an option - it's built right in.

I am getting 'ICaptureGraphBuilder2' : missing storage-class or type specifiers

yaminisridaran12-Jul-07 19:43

yaminisridaran

12-Jul-07 19:43

I am trying to capture video from web cam.I am using ICaptureGraphBuilder2.
I am getting compilation error
'ICaptureGraphBuilder2' : missing storage-class or type specifiers
'CLSID_CaptureGraphBuilder2' : undeclared identifier

I am using VC6 and visual studio 2003
I have install the directx sdk
I have include the dshow.h
I have included the lib files in project settings.
Quartz.lib Strmiids.lib strmbasd.lib wmvcore.lib wmstub.lib Msvcrtd.libWinmm.lib

I have included the paths in the tools->options->directories

but after doing all this I am getting this compilation error messages. Please any body help me.

S.Yamini

Re: I am getting 'ICaptureGraphBuilder2' : missing storage-class or type specifiers

liur1712-Jul-07 20:00

liur17

12-Jul-07 20:00

the Class ICaptureGraphBuilder2 is defined in strmif.h; and the CLSID_CaptureGraphBuilder2 is defined in uuids.h

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.