C / C++ / MFC Discussion Boards

Re: Help with program structure

ryuki16-Oct-04 11:52

ryuki

16-Oct-04 11:52

That simple... Dead | X|

I read "MFC in 21 days", and they mentioned it earlier but I forgot. Sometimes I wonder if I will ever get used to the whole document - view and message concept of MFC. Think about that, there is no member for the CYOURDoc and CYOURView in any class in your whole project.

Thank you again!

Re: Help with program structure

Mad__18-Oct-04 0:16

Mad__

18-Oct-04 0:16

do you know c++ class ? Wink | ;)

<br />
class CYOUView : public CView<br />
{<br />
  int m_int;<br />
};<br />

If you try compile that string:

<br />
 ... GetActiveView()->m_int ...<br />

you got error "m_int not member of class CView"

but if you write:

<br />
 ... ((CYOUView*)GetActiveView())->m_int ...<br />

that will compile, and work whith no error's Wink | ;)

One dialog after the other in mfc dialog app

Anonymous16-Oct-04 0:50

Anonymous

16-Oct-04 0:50

Hi All,

I'm sure this has been asked coutnless times before but i'm buggered if i can find the answer anywhere.

Got an MFC dialog app. I want to DoModal on the first dialog, and then if the ok button was clicked, create a different dialog and DoModal on that.

But the second dialog just returns immediately.

Any ideas?

Jon

Re: One dialog after the other in mfc dialog app

Mad__16-Oct-04 1:49

Mad__

16-Oct-04 1:49

Remove m_pMainWnd assigment from CWinApp::InitInstance and will work

Re: One dialog after the other in mfc dialog app

Maximilien16-Oct-04 2:33

Maximilien

16-Oct-04 2:33

make sur the second dialog is a member variable of the first dialog class. and is created with new, not just created on the stack in the function that creates the second dialog.

something like

m_pSecondDialog = new MySecondDialogClass;
m_pSecondDialog->Create( ... );

instead of

MySecondDialogClass dlg;

Maximilien Lincourt
Your Head A Splode - Strong Bad

GDI resource problem

Leyu16-Oct-04 0:29

Leyu

16-Oct-04 0:29

I was using the code for high color bitmaps in "http://www.codeguru.com/Cpp/G-M/bitmap/article.php/c1721/" and i created a class which can be used for image loading and displaying from a resource the CBitmap and Cpalette are member vars of the class .
I used the class in a game where there are different levels and the number of images is incresed as the level increases then i noticed that the program occasionaly faces the from of creating a compatible dc then i noticed that using the resource meter that level after level the GDI resource is falling in the class destructor i used detach and deleteObject for each CBitmap and Cpalette member but the gdi resource starts falling to a critical level and thats when the program fails to create a compatible dc after closing the window the GDI is restored to its orignal level but as the level increases the GDI level falls?????
what can be done after each level to restore the GDI resources

Re: GDI resource problem

PJ Arends16-Oct-04 7:34

PJ Arends

16-Oct-04 7:34

Any GDI object that you select into a device context must be selected out of the device context before you can delete it. The easiest way to do this is to use the SaveDC and RestoreDC functions.

CDC MemDC;
MemDC.CreateCompatibleDC(NULL);
int Saved = MemDC.SaveDC();
 
// Select your bitmaps, pens, fonts, etc into the MemDC
// Do your drawing and whatever else you want done
 
MemDC.RestoreDC(Saved);

// Now it is safe to delete/destroy all your GDI objects

Also have a look at http://www.codeproject.com/gdi/csavedc.asp[^]

"You're obviously a superstar." - Christian Graus about me - 12 Feb '03

"Obviously ??? You're definitely a superstar!!!" mYkel - 21 Jun '04

Within you lies the power for good - Use it!

Re: GDI resource problem

16-Oct-04 18:18

Thanks a lot Smile | :)

But on the artice u pointed out i saw a thread that says these GDI leaks are on win 9X systems only !
And i have win 98 what do u know about this

Re: GDI resource problem

PJ Arends16-Oct-04 23:35

PJ Arends

16-Oct-04 23:35

These types of resource leaks occur on all versions of windows. That false rumor is spread because NT based systems have a much larger limit on the number of available GDI handles. So a leak on 9x will crash your app a lot quicker than a leak on NT/2K/XP, but they will crash your app if your app runs long enough.

"You're obviously a superstar." - Christian Graus about me - 12 Feb '03

"Obviously ??? You're definitely a superstar!!!" mYkel - 21 Jun '04

Within you lies the power for good - Use it!

sound event/alerts

mark18215-Oct-04 21:19

mark182

15-Oct-04 21:19

Hello guys...

Now, i am currently working to develop an application for my school project. My project is making communication between two computer via telephone line using modems.I wanted to enhance my application, and here is my question :

How do I add an event sound to my application? (i.e. when one computer making call to another, and its receive "RING" message from modem and produce sound (ring.wav)

->> I mean, when one computer receive "RING" message (its shows in edit box), i want the computer produce ringing tone.(some sound alert for the user)

Beside that, when the transfer of data is complited, the computer produce sound for this event.

I have surfed the web for examples and tutorials, but majority of them seem to be a little too advance for me. If someone out there can explain the basics to me, along with a simple example, I would really appreciate it.

Re: sound event/alerts

Sujan Christo15-Oct-04 22:32

Sujan Christo

15-Oct-04 22:32

Hi,
you can use the PlaySound(..) function. Have a look @ the following link which contains a sample which uses this function

http://msdn.microsoft.com/library/en-us/vcsample98/html/_sample_mfc_speakn.asp

Sujan

Problem with the tree Control

Azghar Hussain15-Oct-04 20:15

Azghar Hussain

15-Oct-04 20:15

Hi dudes,
I have a small problem with my tree control. I want to know how to get the text of the Item of the tree control when the user right clicks on it.
I tried with the GetSelectedItem(). But it is not working because user when right clicks on items of the tree control it is not considered as selected.

Thanks in Advance.
best Regards,
Deliver

If you have faith in the cause and
the means and in God, the hot
Sun will be cool for you.

Re: Problem with the tree Control

Ravi Bhavnani15-Oct-04 21:06

Ravi Bhavnani

15-Oct-04 21:06

See this[^] article to determine the HTREEITEM of a right-clicked tree item.

/ravi

My new year's resolution: 2048 x 1536
Home | Articles | Freeware | Music
ravib@ravib.com

Re: Problem with the tree Control

Sujan Christo15-Oct-04 21:07

Sujan Christo

15-Oct-04 21:07

Hi,
Have a look @ this article
http://www.codeguru.com/Cpp/controls/treeview/misc-advanced/article.php/c691
Sujan

Yulianto.15-Oct-04 16:01

Yulianto.

15-Oct-04 16:01

In OnDraw, I use font on the pDC, and it works fine, But when printing and print preview , it didn`t do the font. Where should I attach the font to the printing DC, and why, Thanks

<italic>Work hard and a bit of luck is the key to success.

You don`t need to be genius, to be rich.

Re: DC

Aamir Butt15-Oct-04 21:42

Aamir Butt

15-Oct-04 21:42

You can attach HDI objects to a printer DC in OnPreparePrinting OR OnBeginPrinting Handlers. If you want to do it in OnDraw, you can check if DC is printing or not by using

if(pDC->IsPrinting())

After that, you can do what you want with DC.

goodmast3r wrote:
and why

well, you better see some printing tutorials for this. Too much already available on printing stuff.

<marquee> STUCK STUCK STUCK STUCK

Stuck to Programming through an unbreakable bond Frown | :(

My Articles | My Blog

CopyResourceToFile Function

firehawk15-Oct-04 15:17

firehawk

15-Oct-04 15:17

Can anyone explain to me how to use this function.
Function:

CopyResourceToFile(char*, int);

It havent seen any kind of documentation of source files with this D'Oh! | :doh:

. A friend of mine brought it up and I got curious on what it is for and how to impliment it. Any chance of solving this question?

Re: CopyResourceToFile Function

Sujan Christo15-Oct-04 18:24

Sujan Christo

15-Oct-04 18:24

Hi,
Is it associated with VC++. I think it is related with java. Have a look @ the following link.

http://www.st.cs.uni-sb.de/eclipse/javadoc/de/uds/cs/st/dd/util/FileUtils.html

Sujan

Re: CopyResourceToFile Function

firehawk15-Oct-04 18:56

firehawk

15-Oct-04 18:56

Actually it's related to VC++.

Re: CopyResourceToFile Function

22491715-Oct-04 19:03

224917

15-Oct-04 19:03

where did you see this function

There is no spoon.

mail

Re: CopyResourceToFile Function

Sujan Christo15-Oct-04 19:24

Sujan Christo

15-Oct-04 19:24

Hi,
I don't think that this is a VC++ function. Nothing related 2 this is present in the newsgroup.
No idea.
From the following link

http://www.st.cs.uni-sb.de/eclipse/javadoc/de/uds/cs/st/dd/util/FileUtils.html

i think that it is related 2 java
Sujan

Re: CopyResourceToFile Function

firehawk22-Oct-04 9:56

firehawk

22-Oct-04 9:56

I saw this function in one of my friends small programs. It seemed to export a file from that same program. Which was kind of cool and weird at the same time. Of course he isnt sharing the source. So I tryed to see if I replicate this function. It compiles fine. The only thing is it doesnt work and I dont know how or what it is exactly for. All I know is it looked like this

CopyResourceFromFil("File.exe", 232);

My guess now is that it "232" might be the name of a resource being exported in Bin? and that "File" is named of the exported file? Still confused about this. I know its a VC++ function because it compiles without error.

About DirectDraw

Guoguor15-Oct-04 14:27

Guoguor

15-Oct-04 14:27

About DirectDraw................
I want to create a surface to receive the data from a videoport,but the overlay surface is unsupported.
Well,What kinds of surface should I create?
Please give me some suggestion

free like a bird

Help with CChildView

Robert Buldoc15-Oct-04 12:21

Robert Buldoc

15-Oct-04 12:21

Hi,
Firstly, I am new to MFC so any help appreciated. I am building a single document MFC application without Doc/View Architecture support. In my application I want to be able to show different CView subclasses such as CListView, CFormView instead of the CChildView. I need to change to different views by click of a button Tool bar. So how can I achieve this? I have looked on the forums and articles on this site and have found nothing on the subject.

I appreciate any kind of help you can offer. Smile | :)

Robert Buldoc

Re: Help with CChildView

Sujan Christo15-Oct-04 19:35

Sujan Christo

15-Oct-04 19:35

Hi,
i do think that you must have to write a mdi application. Only mdi application can handle different types of view automatically.
have a look @

Multiple Document Types, Views, and Frame Windows

@ msdn
Sujan

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