how a variable can be access in all dialogs of a project using MFC?

Question

0.00/5 (No votes)

See more:

i have made a file open dialog, it contains an edit control whose variable is "path" that contains the file name. what i want is to use this variable's value in other dialogs but it gives the error that "path" is an undeclard identifier.

C#

class CAboutDlg : public CDialog
{
public:
    CAboutDlg();
    static CString imgname;

in the same class, i used it like this

C++

CString image=CAboutDlg::imgname;
 CString szFilename(image);

and passing value of path by this code

MIDL

path=dlg.GetPathName();
UpdateData(FALSE);
CAboutDlg::imgname=path;

but it still gives error that CAboutDlg and imgname are undeclared identifier in the above code in which i m passing value of path. i did the same which i learned from the site now what's wrong with that?:confused:

Posted 1-Jul-10 21:27pm

Sweety Khan

Updated 1-Jul-10 23:02pm

v2

Add a Solution

3 solutions

Solution 2

Sounds like your problem is that you cannot access the CAboutDlg class at all from that specific part of the program. In MDI/SDI applications the code wizard puts declaration (and implementation) of the CAboutDlg in the App .cpp file. You might need to move the class declaration to your header file (or a new header file) and make sure you include that in the file you want to access it from.

Seems a bit ugly though. Make a settings class and pass along an instance of it instead like Cedric suggested.

Posted 2-Jul-10 0:48am

Niklas L

Solution 3

Simple enough question. The answer really depends on how the app is set up if this is a dialog based app this is as easy as calling the CEditControl::GetWindowText() ,your EditControl would obviously need a control variable to be able to use the GetWindowText() method, whenever you need the text.

You could always create a global variable and store the string when ever this is changed by creating an event handler.

Is this an MDI or SDI app? In the case that this is dialog is not the main dialog/frame I am assuming it is created and instantiated by a calling function and only exists within the scope of that function. So you need to get the information while the getting is good so to speak.

In the vein of:

YourFunc()
{
yourDlgClass FileDLG;

if(FileDLG.doModal() == ID_OK)
{
YourGlobalString = FileDLG.imgname;
}
}

Posted 2-Jul-10 3:03am

SnowHow

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Cedric Moonen · Accepted Answer · 2010-07-01T21:33:00

Solution 1

You have several options for doing that.
The easiest but the ugliest would be to declare your path as a global variable.
A much better approach would be to have something like a class wrapping some options of your program. This class would then be instanciated as a singleton which would be accessible by every part of your program (google for "singleton pattern" for more information).

Posted 1-Jul-10 21:33pm

Cedric Moonen

Comments

Sweety Khan 2-Jul-10 3:47am

i wanna do the easiest and the ugliest way. but how can i declare path as a global variable? as when i right click on an edit control->add variable, access has only three options private,protected, public.

Cedric Moonen 2-Jul-10 3:53am

You certainly won't put your edit control as a global variable. Instead, when the user pressed the Ok button, you get the text from the edit control and store it in the global variable (which is a string).

Sweety Khan 2-Jul-10 4:49am

i learned the declaration of global variables from this site http://www.codeguru.com/cpp/cpp/cpp_mfc/article.php/c803. what i have done, i m showing it in my question. plz see

Sweety Khan 2-Jul-10 15:42pm

thanxxxx everyone its done