C / C++ / MFC

Re: Updating window when drawing

3-Jun-03 6:09

In my MDI app, I'm trying to draw an ellipse in my CView (In OnDraw() more exactly), but my view does not get updated unless I move or scroll or does something ot the window. Invalidate() and RedrawWindow() just make my app loop, since they call OnDraw which ... you know Big Grin | :-D

so how do you get the view updated once something has been put in the pDC ? Confused | :confused:

Thanks...

~RaGE();

valikac3-Jun-03 7:48

valikac

3-Jun-03 7:48

Try other updating CWnd member functions including UpdateWindow().

Kuphryn

Re: Updating window when drawing

Maximilien3-Jun-03 8:05

Maximilien

3-Jun-03 8:05

well, if I understood correctly, he tried putting those in the OnDraw which will callback the OnDraw and will crash the software ...

The problem (I think) is that he draws in the OnDraw, but issues the drawing somewhere else (ie. from a menu or the mouse handler) which might not Invalidat the view, and will not draw.

Maximilien Lincourt
For success one must aquire one's self

Multimedia timers

act_x3-Jun-03 5:31

act_x

3-Jun-03 5:31

I wanted to use the Multimedia timers and have implemented based on reference in the MSDN site
I Included mmsytem.h

still i get the following linker errors

Linking...<br />
error LNK2001: unresolved external symbol __imp__timeSetEvent@20<br />
error LNK2001: unresolved external symbol __imp__timeBeginPeriod@4 error LNK2001: unresolved external symbol __imp__timeGetDevCaps@8

I was unable to figure out the problem !

Re: Multimedia timers

Rage3-Jun-03 5:40

Interprocess communication

3-Jun-03 5:40

Did you add winmm.lib to the library your are linking to ?

~RaGE();

Re: Multimedia timers

act_x3-Jun-03 5:57

act_x

3-Jun-03 5:57

thanks

doctorpi3-Jun-03 5:13

doctorpi

3-Jun-03 5:13

Hi guys
I'm trying to implement a solution to communicate 2 app through a global system message
In the app1 I do in InitInstance

msgApp=RegisterWindowMessage("DATABASE_UPDATED");

and then when is necessary I do

PostMessage(theApp.msgApp,1,1) wParam and lParam it doesn't matter.

What I have to write to manage DATABASE_UPDATE message in app2 and where?

Both app are SDI app.
Best Regards
Dr. Pi

Re: Interprocess communication

Rage3-Jun-03 5:24

Re: Interprocess communication

3-Jun-03 5:24

With MFC :

With a simple message (#define MYMESSAGE WM_USER+1) :

Go into the your MainFrame.cpp, and add :

BEGIN_MESSAGE_MAP(CMainFrame, CFrameWnd)
	//{{AFX_MSG_MAP(CMainFrame)
	ON_WM_CREATE()
	ON_WM_SIZE()
        ON_MESSAGE(MYMESSAGE,memberFxn)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

Prototype , in MainFrame.cpp :

// Generated message map functions
protected:
//{{AFX_MSG(CMainFrame)
afx_msg LRESULT memberFxn(WPARAM, LPARAM);
//}}AFX_MSG
DECLARE_MESSAGE_MAP()

With registered message :

Same with :

ON_REGISTERED_MESSAGE( msgApp, memberFxn )

and

afx_msg LRESULT memberFxn(WPARAM, LPARAM);

~RaGE();

Trollslayer3-Jun-03 6:07

Trollslayer

3-Jun-03 6:07

I had a case of my previous system with VC++ 6.0 where I tried something like this, only to discover that WM_USER wasn't defined in the header given, had to alter the header file. Seems ok on this system though Unsure | :~

Elaine

The tigress is here Big Grin | :-D

Re: Interprocess communication

Rage3-Jun-03 5:28

ListCtrl - Put a imagem background ??

3-Jun-03 5:28

And I forgot to add that you have to do

msgApp=RegisterWindowMessage("DATABASE_UPDATED");

with exactly the same string "DATABASE_UPDATED" in both application, otherwise, it won't work ... (I also suggest to add your application name in the string, because database_updated is pretty common).

~RaGE();

Array Timings.

⁷³Zeppelin3-Jun-03 5:10

⁷³Zeppelin

3-Jun-03 5:10

I need the advice of a storage expert.
Does anyone have experience with timing array performance?

For example, if I have a data structure like the following:

For an array called Array, I know that Array[0] to Array[5] holds
a collection of like objects and Array[6] to Array[8] holds another collection of like objects. I keep track of the new object indices, for example I store 0 and 6 and iterate through the list based on these numbers. So I can skip to the next element right away by jumping from 0 to 6. Now compare this to a CMap object.

Can anyone tell me which will provide the faster access times and which will use the least memory? How is a CMap object structured and how does it allocate its memory? (Does it use an iterator to do a search?)

OR, if anyone knows a better way of doing this, all suggestions are welcome.

Re: Array Timings.

valikac3-Jun-03 7:50

valikac

3-Jun-03 7:50

One solution is a map container with, for example, a vector as its value. Each key corresponds to a value of a collection of like objects.

Kuphryn

Cris3-Jun-03 4:55

3-Jun-03 4:55

How can I put a imagem in the background of a ListControl ??
The CListCtrl::SetBkImagen() function really doesn't work ??

[]'s
Cris.

Rage3-Jun-03 5:09

3-Jun-03 5:09

Have you read this note ? :

Note Because CListCtrl::SetBkImage makes use of OLE COM functionality, the OLE libraries must be initialized before using SetBkImage. It is best to initialize the COM libraries when the application is initialized and uninitialize the libraries when the application terminates. This is automatically done in MFC applications that make use of ActiveX technology, OLE Automation, OLE Linking/Embedding, or ODBC/DAO operations.

~RaGE();

Cris3-Jun-03 9:42

3-Jun-03 9:42

Ok, it work well with OLE Automation support.
But, I have a application. How can I "SET" this support with MS Visual Studio 6 ??

Thanks a lot ...
CRIS.

Franz Granlund4-Jun-03 0:44

Franz Granlund

4-Jun-03 0:44

In your CApplicationApp::InitInstance()

put

if (!AfxOleInit())
return FALSE;

Cris4-Jun-03 2:04

4-Jun-03 2:04

Ok, thanks ...

Another thing: I did put the imagem in the list background, but the list have text itens. How can I make the text be transparen too ??

[]'s
CRIS.

Franz Granlund5-Jun-03 2:10

Franz Granlund

5-Jun-03 2:10

Check out http://www.codeguru.com/listview/background_image.shtml..

Good luck! Smile | :)

Cris5-Jun-03 2:39

5-Jun-03 2:39

Message: "The page cannot be displayed"
Any other idea ??

I need to make a COLORREF object transparent. So, I can use in the SetBkColor() function. It's possible ??

[]'s