C / C++ / MFC

10-Jul-08 17:11

Hello, I need some help and I'm a MFC newbie, please be patient with me.

I simply tried to draw text in the client area, at first I thought OnPaint message was not caught, but when I was trying to resize the Window multiple times, the text appears. It appears for only only a very brief time, not even long enough for the eyes to see. Is there something I forgot to do?

The text should not disappear even if the OnPaint returns right?

CPaintDC dc (this);
CString str = _T("String");

CRect rect;
GetClientRect(&rect);
dc.DrawText(str,-1,&rect, DT_VCENTER | DT_CENTER | DT_SINGLELINE);

enhzflep10-Jul-08 17:48

enhzflep

10-Jul-08 17:48

Only thing I can think of, is that if you handle WM_PAINT, you're expected to return a non-zero value, otherwise windows will also handle the message

jazy110-Jul-08 18:04

10-Jul-08 18:04

Thanks for the help, that is a good point I'll look into it.
Thats what I also know for WIN32 API... but does MFC classes does that implicitly or explicitly?

enhzflep10-Jul-08 18:20

enhzflep

10-Jul-08 18:20

Closer examination seems to indicate that it's handled implicitly. I guess painting in the non-client area would have a similar effect to the one you describe, unless onNcPaint was being used..

jazy110-Jul-08 18:59

10-Jul-08 18:59

So that phenomenon is suppose to be normal? Thanks for your efforts, if some other ideas come up, please let me know. I will really appreciate it.

Nelek10-Jul-08 21:48

Nelek

10-Jul-08 21:48

No, it should be like that.

What you write in the OnPaint should stay in the dialog until a update window, update region, update dialog, erase background, resize the window/dialog, change between apps... any message that implies a refresh of the screen.

So if your text is not showing I guess you are calling unvoluntarly one of that messages just after your OnPaint, or not calling the OnPaint fter on of those messages.

Use the Step by Step in debugging and take a look on your code executing.

Regards.
--------
M.D.V. Wink | ;)

If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?
Help me to understand what I'm saying, and I'll explain it better to you
“The First Rule of Program Optimization: Don't do it. The Second Rule of Program Optimization (for experts only!): Don't do it yet.” - Michael A. Jackson
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jazy110-Jul-08 22:50

10-Jul-08 22:50

Thanks for your effort. I will look into it.

Mark Salsbery11-Jul-08 6:25

Mark Salsbery

11-Jul-08 6:25

jazy1 wrote:
The text should not disappear even if the OnPaint returns right?

Right!

Something else is going on that you haven't shown...

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

jazy113-Jul-08 21:03

regular expression - removing last character from result

13-Jul-08 21:03

I found out what was wrong, the generated code by the VS2005 for painting the toolbar and status bar(OnCreate) kept repainting the client area, thats why it wasn't visible... I think this may not be the fix, but at least I got the string to show... Thanks for your efforts guys.

P.S. I still don't think this is the fix since it is a generated code, it is suppose to work properly... Post please if you have any idea. Smile | :)

print a window

tataxin10-Jul-08 16:46

tataxin

10-Jul-08 16:46

I have a MDI project, now I want to print the interface. So I saw this article:

http://support.microsoft.com/kb/q186736/

Then I try to apply to my project, just create a menu item or button, do like this:

// message map
ON_COMMAND(ID_PRINT_PRINTALL, &CMyDlg::PrintGUI)

// declare function
afx_msg void PrintGUI();


// implement function
void CMyDlg::PrintGUI(){
	// get the Main window
	CWnd* a = AfxGetMainWnd();
	
        // print it, this function is implemented follow the above article
	PrintWindowToDC(*a);
}

But when I run, nothing happen.
Have anyone ever tried the similar thing? Please helpppppppp !!!!!!!!!!

Re: print a window

Nelek10-Jul-08 21:42

Nelek

10-Jul-08 21:42

here in the CP there are articles to print a screen capture, to print from a dialog, to print using or not using MFC... I strongly recommend you to have a look into that section.

IMHO the best articles are from Roger Allen, Chris Maunder, Joseph M Newc...

Regards.
--------
M.D.V. Wink | ;)

rp_suman10-Jul-08 16:29

rp_suman

10-Jul-08 16:29

I am trying to convert the c file for some other compiler to MS VC++ .Net compiler.

In the c file, there are some value specified like 031bH which means 0x031b.

I want change all of them using Regular Expression,
Using the R.E. "[0-9]^3[a-fA-F0-9][H]" in "Find what" and "0x\0" in "Replace with" the value is coming like 0x031bH.

How can I remove the H in a single step while prefixing with "0x"?

--
"Programming is an art that fights back!"

Re: regular expression - removing last character from result

geoffs15-Jul-08 17:11

geoffs

15-Jul-08 17:11

Try this (it works in VI for me, but your mileage may vary depending on which RE tool you are using - regardless, it should be enough to get you running in your environment):

Search string: "\([0-9a-fA-F]\{1,4\}\)H"

Replace string: "0x\1"

Note that the above will only parse hex constants in the form you mentioned with 1-4 hex digits preceding the 'H' suffix.

Re: regular expression - removing last character from result

rp_suman16-Jul-08 2:04

rp_suman

16-Jul-08 2:04

Hi
Thank you very much for the help!!

I will try this..

Regards,
Suman

--
"Programming is an art that fights back!"

How to Associate a File Extension with a Program

Bram van Kampen10-Jul-08 15:34

Re: How to Associate a File Extension with a Program

10-Jul-08 15:34

Sorry, Getting Older, I forgot.

There is a way of registering a File Extension with an App at Startup. Forgot how to do that.

Regards, Sleepy | :zzz:

Bram van Kampen

Nelek10-Jul-08 21:29

Nelek

10-Jul-08 21:29

Take a look three messages below this one. The question is asked and answered with some links.

Regards.
--------
M.D.V. Wink | ;)

Re: How to Associate a File Extension with a Program

Bram van Kampen11-Jul-08 14:31

Re: How to Associate a File Extension with a Program

11-Jul-08 14:31

I've found it since. What I was looking for was:
void CWinApp::RegisterShellFileTypes(BOOL bCompat)

Bram van Kampen

Bram van Kampen12-Jul-08 13:02

Re: How to Associate a File Extension with a Program

12-Jul-08 13:02

Hi,
Well, the question 3 lines below covered the same topic, but did not cover what I was after. I was looking for the Name of: CWinApp::RegisterShellFileTypes(); (I could at the time not think of the Name, and was not sure of the class it belonged to). The business part of this resides in CDocManager. I am now doctorring that code to register critical extensions in my setup program.

Thanks anyways for the Interest you showed in my question.

Regards, Smile | :)

Bram van Kampen

Mark Salsbery11-Jul-08 6:31

Mark Salsbery

11-Jul-08 6:31

Hi Bram.

Wake up!

Introduction to File Associations[^]

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: How to Associate a File Extension with a Program

Bram van Kampen11-Jul-08 14:30

Re: How to Associate a File Extension with a Program

11-Jul-08 14:30

I've found it since. What I was looking for was:
void CWinApp::RegisterShellFileTypes(BOOL bCompat)

Thanks

Bram van Kampen

Bram van Kampen12-Jul-08 16:08