Dialog - worked example

key : purple - original code / blue - new code

Step 1 :

Create a new project using the MFC AppWizard(exe) (this worked example is based on a program which was called names). Select Multi Document Application at Step 1 of the Wizard. This is not necessarry for this program but it is essential for later developments.

Step 2 :

Using ClassWizard add the following (protected) member variables to the Document :

CString m_strFirstName;

CString m_strSecondName;

Step 3 :

These variables may be initialised in the Document's constructor :

CNamesDoc::CNamesDoc()
{

m_strFirstName = "";
m_strSecondName = "";

}

Step 4 :

Using the ClassWizard add the following (public) member functions to the Document :

void CNamesDoc::SetFirstName(const CString &strFirstName)
{

m_strFirstName = strFirstName;

}

void CNamesDoc::SetSecondName(const CString &strSecondName)
{

m_strSecondName = strSecondName;

}

CString CNamesDoc::GetFirstName()
{

return m_strFirstName;

}

CString CNamesDoc::GetSecondName()
{

return m_strSecondName;

}

Step 5 :

In the Resource View open the menu folder followed by the NAMESTYPE menu bar. Create a menu item called "Enter Names" - give this the identity "ID_ENTERNAMES". Open the ClassWizard and attach an event handler to this ID in the View. This is automatically called OnEnterNames().

Step 6 :

Remaining in the Resource View create a new dialog within the dialog folder. This will be a new class - a sensible identity would be ID_ENTER_NAMES_DLG and a suggested class name would be CEnterNamesDlg.

This dialog box should have two edit boxes for the user to enter the first and second names. An OK and a cancel button are provided by the compiler. Change the ID of each edit box for clarity (ie IDC_FIRST_NAME and IDC_SECOND_NAME). Using ClassWizard add member variables (CString m_strFirstName to the first edit box and CString m_strSecondName to the second edit box).

*Remember to inform the Document about this new class*

Step 7 :

Go to the OnEnterNames() function created in Step 5 and add the following code :

void CNamesView::OnEnterNames()
{

GetDocument()->AddNames();
Invalidate();

}

Step 8 :

Add an AddNames() function to the Document :

void CNamesDoc::AddNames()
{

CEnterNamesDlg dlg;

if(dlg.DoModal() == IDOK)
{

m_strFirstName = dlg.m_strFirstName;
m_strSecondName = dlg.m_strSecondName;

}

}

Step 9 :

Edit the OnDraw() function within the View :

void CNamesView::OnDraw(CDC* pDC)
{

CNamesDoc* pDoc = GetDocument();
ASSERT_VALID(pDoc);
// TODO: add draw code for native data here

pDC->TextOut(0, 0, pDoc->GetFirstName() + " " + pDoc->GetSecondName());

}

Click here for the basic exercise

Click here for the source code

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