C / C++ / MFC Discussion Boards

ThatsAlok17-Mar-05 3:06

17-Mar-05 3:06

DavidCrow wrote:
A cleaner approach is to make the member variables private and provide set/get methods.

Sir,Could please throw more light on this particular statement!!!

thanks

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Re: Newbie Question about Classes

David Crow17-Mar-05 3:49

David Crow

17-Mar-05 3:49

It is one of the basic fundamentals of OOP - access control.

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

Re: Newbie Question about Classes

V.17-Mar-05 2:59

17-Mar-05 2:59

Like David Crow states:

incapsulation is one of the pilers of O-O programming.
declaring variables public is generally a bad idea.

No hurries, no worries.

Re: Newbie Question about Classes

ThatsAlok17-Mar-05 3:05

ThatsAlok

17-Mar-05 3:05

Friend!
But here problem is about two classes accessing each other variable.
for that Why can't we use pointer approach which i have stated above.

I am Sorry,if you angry with my above quote.I am just asking you to respect a decent man who help every body here!!!..

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Re: Newbie Question about Classes

V.17-Mar-05 3:18

17-Mar-05 3:18

ThatsAlok wrote:
if you angry with my above quote

Angry? it will take a lot more to get me angry, it was only an expression of surprise. (besides if I'm angry you'll see this icon: Mad | :mad:

)

respect for trying to help, always, but in my opinion this time you made a mistake (like everybody does btw), I only pointed that out.

ThatsAlok wrote:
But here problem is about two classes accessing each other variable

getters, setters, properties. Why? Suppose your variable changes value unexpectedly, where start looking? When using a setter for example. You only have to set your breakpoint there, wait for the change and follow the stack trace.

so do something like this as good practice:

class something{<br />
  private int number = 0;<br />
<br />
  public SetNumber(int num){<br />
    //do some checks eg if(num < 0){ num = 0); }<br />
    number = num;<br />
  }<br />
  public GetNumber(){<br />
    return number<br />
  }<br />
}

in C# getters and setters are equal to properties.

Please don't be agitaded so quickly, nobody's attacking you.

No hurries, no worries.

Re: Newbie Question about Classes

ThatsAlok17-Mar-05 18:41

ThatsAlok

17-Mar-05 18:41

First Of All Thanks!!!

V. wrote:
Please don't be agitaded so quickly, nobody's attacking you.
Blush | :O

:->

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refresh hide window

pl-isa17-Mar-05 1:07

pl-isa

17-Mar-05 1:07

Hi,
I have problems to refresh my application when it is recovered by another window. In fact, I display images, (.ppm format), in CStatic controls, and everything is refreshed, except the images. I display the images in the OnPaint() function, so that is OK when I move the window on the edges of the screen. But when the window is hidden and then sets visible, the images disappear...I have tried to add UpdateWindow, UpdateData, Invalidate, etc... in OnPaint()... but it failed.

Can someone help me please?

Thanks

Isabelle

Re: refresh hide window

Ravi Bhavnani17-Mar-05 1:32

Ravi Bhavnani

17-Mar-05 1:32

Perhaps you're overriding OnShowWindow(), causing the default behavior (that would eventually cause OnPaint() to be called) to not occur? Try overriding OnShowWindow() in the following manner:

CMyDialog::OnShowWindow (BOOL bShow, UINT nStatus)
{
  // Do default operation
  CWnd::OnShowWindow (bShow, nStatus);

  // Force window repaint
  Invalidate();
  UpdateWindow();
}

/ravi

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Re: refresh hide window

pl-isa17-Mar-05 3:01

pl-isa

17-Mar-05 3:01

Thanks for your answer Ravi!
In fact I had already tried that, unsuccesfully...
I don't know exactly when this function is called, but I thought it is only when the application is opened for the first time... no??

Thanks again
Isabelle

Re: refresh hide window

Ravi Bhavnani17-Mar-05 8:01

Ravi Bhavnani

17-Mar-05 8:01

pl-isa wrote:
but I thought it is only when the application is opened for the first time... no??

Actually, WM_SHOWWINDOW is sent whenever the window is shown, hidden, minimized, maximized or restored, not only at startup. But you're right - what I should have said is, add these lines to your OnPaint() handler:

CMyDialog::OnPaint (...)
{
  m_myPicStaticCtrl.Invalidate();
  m_myPicStaticCtrl.UpdateWindow();
}

This should force an immediate repaint of the static control. If this doesn't work, I'd put TRACE() statements in your static control's OnPaint() handler to see if it's doing anything funky. It might be getting called, but not painting after the first invocation.

/ravi

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Re: refresh hide window

eli1502197917-Mar-05 1:59

eli15021979

17-Mar-05 1:59

Hi,
Did you tried the RedrawWindow() of your CStatic control in your OnPaint()?

Regards,
Eli

Re: refresh hide window

pl-isa17-Mar-05 3:06

pl-isa

17-Mar-05 3:06

Hi Eli,

I had also already tried the RedrawWindow(), but unsuccesfully...
Are threads use for that kind of things??
If you have any other ideas... don't hesitate!

Thanks a lot for your answer!
Isabelle

Help for Compiled HTML (CHM)Viewer

anukrati17-Mar-05 1:03

anukrati

17-Mar-05 1:03

Hello All,

I am planning to design my help system for my application. I want to use CHM file format. I am new to this format and I have a basic queries:

Can any body please help me out in this.

As per my understanding CHM is compressed form of HTML. My query is "When I will decompress the contents of CHM format will i get my out put in HTML format".

Any suggestion about how a help system should be designed are most welcome.

Thanks,
Ritu

Anukrati

Re: Help for Compiled HTML (CHM)Viewer

ThatsAlok17-Mar-05 1:18

ThatsAlok

17-Mar-05 1:18

OK,now i give you actual information of format CHM file,
http://www.nongnu.org/chmspec/latest/Internal.html[^]

Actually I believe, as you are S/W developer you should know the internals working of app that why I am providing you with documentation only.

Anyway, if still need Source code for your problem. I can provide you that too.

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Here is Sample Source code for CHM

ThatsAlok18-Mar-05 22:38

ThatsAlok

18-Mar-05 22:38

http://www.codeproject.com/tools/HTMLAssistant.asp[^]

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Re: Help for Compiled HTML (CHM)Viewer

Sam Jiang13-Apr-05 22:16

Sam Jiang

13-Apr-05 22:16

You can decompile the CHM file to a set of files in the CHM file.

I use PowerCHM to decompile and compile it.

Library for MP3 Editing

fishwolf17-Mar-05 0:40

fishwolf

17-Mar-05 0:40

Hi,

I would search a library / activex o SDK tools for developer a program in Visual C++ that permit cut and paste and write of result of mp3 audio file.

For example. i take a song and extract from 10th second to 30th second and write a new file in specific format.

Who i can make ?

Thanks

Hi.
I'm new developers

Re: Library for MP3 Editing

Ravi Bhavnani17-Mar-05 1:40

Ravi Bhavnani

17-Mar-05 1:40

See Bass[^]. It rocks! Cool | :cool:

/ravi

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Type Conversion from std::string to string/char/.....

Vijay Vamsi17-Mar-05 0:39

Vijay Vamsi

17-Mar-05 0:39

I am getting an error message, tried hard to come out of this. anybody can help????????????????????
Please Treat it as urgent

sysInfo :- is a class which is calling 'getIPAddress()' which is of type 'std::string'
in sysInfo class the result is returned in the form of std::string,
this is being called in main() function.
os.m_IP_Address = sysInfo.getIPAddress();'
'os' is a object of class which inherits the Recordset class and
'm_IP_Address' is of type CString which is the column name in which the value of "sysInfo.getIPAddress()" should be placed
(os.m_IP_Address = sysInfo.getIPAddress();)
But ,I get the error message as shown below.

error C2679: binary '=' : no operator defined which takes a right-hand operand of type 'class std::basic_string<char,struct std::char_traits<char="">,class std::allocator<char> >' (or there is no acceptable conversion)

Language:- VC++ and the data base is MSAccess
Please give me tthe solution for this with the code example.

Re: Type Conversion from std::string to string/char/.....

ThatsAlok17-Mar-05 0:45

ThatsAlok

17-Mar-05 0:45

std::string expose the function called c_str() which return char string

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HOW DO I CENTER TEXT IN A TEXT BOX????

iddon1717-Mar-05 0:21

iddon17

17-Mar-05 0:21

i cant seem to center text in a text box. there doesn't appear to be an option for this in the toolbar. Im usin borland c++. Big Grin | :-D

I don't know what to write here!!!!

Re: HOW DO I CENTER TEXT IN A TEXT BOX????

ThatsAlok17-Mar-05 0:40

ThatsAlok

17-Mar-05 0:40

modify the style of your edit box to ES_CENTER using CEdit::ModifyStyle(...) api

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Re: HOW DO I CENTER TEXT IN A TEXT BOX????

iddon1717-Mar-05 2:36

iddon17

17-Mar-05 2:36

How do I go about doing this?

I don't know what to write here!!!!

Re: HOW DO I CENTER TEXT IN A TEXT BOX????

David Crow17-Mar-05 2:40

David Crow

17-Mar-05 2:40

I doubt Borland C++ has such a class.

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

Re: HOW DO I CENTER TEXT IN A TEXT BOX????

David Crow17-Mar-05 2:46

David Crow

17-Mar-05 2:46

It's been almost 15 years since I've used a Borland compiler, but can you do something like:

SetWindowLong(hwndEdit, GWL_STYLE, GetWindowLong() | ES_CENTER);

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

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