pass variable value from one dialogbox to other/ one class to other class in vc++ MFC

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C#

hello,

I am trying to pass variable of one class to other class, i did this by calling that doalogbox using DoModal method . But it give retry,Abort,ignore type of messagebox/ Exception.
Is there any way to access variable of one class to other class.

Posted 17-Jan-16 0:20am

Kishor-KW

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Jochen Arndt 17-Jan-16 7:30am

There are many methods to do that. Examples are passing it using an appropiate constructor (MyClass(varType varName)), providing some kind of Set function (SetVar(varType varName)) or using the Windows message system with a user defined message (SendMessage(), PostMessage()).

But without seeing the code portions actually used, it is impossible to tell you what is going wrong.

So you might add the necessary code snippets by editing your question. To do this use the green 'Improve question' link.

Kishor-KW 17-Jan-16 7:48am

please reply

Kishor-KW 17-Jan-16 7:35am

in CMyDialog1 class file:
m_Variable =CompanyName;

and in CMyDialog2 class file:
CString strvalue;
CMyDialog1 dlg;
strvalue= dlg.m_Variable ;

if we do not call DoModal method before assignment then dlg.m_intVariable is empty.

Jochen Arndt 17-Jan-16 7:56am

The code looks a bit incomplete.
Please explain what do want to do:
- Set a variable of CMyDialog1 before showing the dialog?
- Retrieve the value after the dialog has been closed?
- Or even both?

Kishor-KW 17-Jan-16 8:12am

In CMyDialog1 class I am assigning a value to the variable m_Variable. after closing CMyDialog1 , CMyDialog2 is opened and now here I assigned m_Variable value
to variable of CMyDialog2

Both CMyDialog1 and CMyDialog2 are individual DialogBoxe with there individual class

Jochen Arndt 17-Jan-16 8:19am

When the CDialog1 objcet does not exist anymore, you can not access it. So you must retrieve the variable before the dialog is destroyed:

CMyDialog1 *dlg = new CMyDialog(parent);
dlg->DoModal();
// Get variable here before dialog is destroyed
strvalue = dlg->m_Variable;
// now we can delete the dialog
delete dlg;

Similar applies when creating the dialog on the stack like in your code snippet.

Kishor-KW 17-Jan-16 8:29am

what is parent here?

Jochen Arndt 17-Jan-16 8:48am

It is just an example. It can be NULL or the parent dialog / window (e.g. 'this' we called from within another dialog). The correct form would be with template. See https://msdn.microsoft.com/en-us/library/8zkyyhxw.aspx.

Richard MacCutchan 17-Jan-16 8:11am

Retry,Abort,Ignore indicates some error in your dialog. You should find out where that occurs and correct the code.

Kishor-KW 17-Jan-16 8:14am

if I do not called CMyDialog1.DoModal then those Retry,Abort,Ignore indicates some error are not occured.

Richard MacCutchan 17-Jan-16 8:24am

Sorry, that makes no sense. You should edit your question and explain the issue in more detail.

Sergey Alexandrovich Kryukov 17-Jan-16 13:05pm

It's not about classes, it's about class instances.
—SA

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