Hide ahd Show Dialog

Hi All,

I have two dialogs(IDD_DIALOG,IDD_DIALOG2).IDD_DIALOG is main dialog. I have create the second one in button click event of first dialog.

code is:

void CFirstDlg::OnBnClickedButton1()
{
this->ShowWindow(SW_HIDE);
SecondDlg *dlg=new SecondDlg (); //second dialog class
dlg->DoModal();
}


If i click the second dialog button. I need to hide the curron dialog(ie. IDD_DIALOG2) and show the first dialog with datas.


Please help me............


Regards,
Priya

You created a modal dialog. You can only hide it when you close it. All mouse and keyboard input goes to it, not to its parent.

If you have to show and hide dialogs, you need to use modeless dialogs. Use Create() and ShowWindow().

Perhaps this is the one you are looking for.

http://www.codeproject.com/KB/dialog...gmodeless.aspx

Quote:

---

Originally Posted by cilu

You created a modal dialog. You can only hide it when you close it. All mouse and keyboard input goes to it, not to its parent.

If you have to show and hide dialogs, you need to use modeless dialogs. Use Create() and ShowWindow().

---

Something like this

Code:

---

void CDialog1::OnButton1()
{
    CDialog2 *dia2 = new CDialog2();   
    dia2->Create(IDD_DIALOG2);
    dia2->ShowWindow(SW_SHOW);
}

---

HI,

I have list box,grid,etc.. and it has some datas in my first dialog.I have create the 2nd dialog in button click event.

code:

void CDialog1::OnButton1()
{
this->ShowWindow(SW_HIDE);
CDialog2 *dia2 = new CDialog2();
dia2->Create(IDD_DIALOG2);
dia2->ShowWindow(SW_SHOW);
}

In second dialog button click event, i need to show the first dialog with that datas.

How to do this?

Please help me....................

Hi priya,
there are many ways for doing this.

one way is like below..

void CDialog1::OnButton1()
{
this->ShowWindow(SW_HIDE);
if(!m_dlg2)
m_dlg2.Create(IDD_DIALOG2,0);
m_dlg2.ShowWindow(SW_SHOW);
}

//m_dlg2 is an object of CDialog2 and member variable of CDialog1

void CDialog2::OnButton1()
{
this->ShowWindow(SW_HIDE);
HWND hwnd = ::FindWindow(NULL,L"Title of CDialog1");
::ShowWindow(hwnd,SW_SHOW);
}


i think it should work although Dialog1 is Model & Dialog2 is Modeless
:)

Hi iam very new to MFC. I know to create member variable for button and controls. But i dont know how to create member variable for CDialog.

Please help me........

Rightmousclick on dialog
choose add variable then fill it in

Quote:

---

Originally Posted by priyasubramani

Hi iam very new to MFC. I know to create member variable for button and controls. But i dont know how to create member variable for CDialog.

Please help me........

---

You have Dialog1.h & Dialog2.h right?

So Add below codein Dialog1.h

public:
CDialog2 m_dlg2;

now here you have created object of CDialog2. m_dlg2 is member variable of CDialog1 class.
now use the code which i have written in my last post.

I am confused about your 2 dialog variables

Quote:

---

Originally Posted by rahulvaishnav

Hi priya,
there are many ways for doing this.
void CDialog2::OnButton1()
{
this->ShowWindow(SW_HIDE);
HWND hwnd = ::FindWindow(NULL,L"Title of CDialog1");
::ShowWindow(hwnd,SW_SHOW);
}

---

My first dialog(IDD_DIALOG) class name is CDialog1.How to give it into FindWindow(). Bcoz in my application all dialogs has same name.

Quote:

---

Originally Posted by priyasubramani

My first dialog(IDD_DIALOG) class name is CDialog1.How to give it into FindWindow(). Bcoz in my application all dialogs has same name.

---

Ok then use CDialog1 pointer in CDialog2 and then you can directly access its
ShowWindow(SW_SHOW) Method.

Quote:

---

Originally Posted by rahulvaishnav

Ok then use CDialog1 pointer in CDialog2 and then you can directly access its
ShowWindow(SW_SHOW) Method.

---

i have given like this.

this->ShowWindow(SW_HIDE);
CDialog1 *dlg=new CDialog1();
dlg->ShowWindow(SW_SHOW);

But it showing dubug assertion error.

Quote:

---

Originally Posted by priyasubramani

i have given like this.

this->ShowWindow(SW_HIDE);
CDialog1 *dlg=new CDialog1();
dlg->ShowWindow(SW_SHOW);

But it showing dubug assertion error.

---

You didn't call Create, so the Windows part of it doesn't exist yet.

Is there any reason you're using new to create your dialog, instead of just allocating it locally? You have a memory leak as you're not deleting it when you're done.

Quote:

---

Originally Posted by priyasubramani

i have given like this.

this->ShowWindow(SW_HIDE);
CDialog1 *dlg=new CDialog1();
dlg->ShowWindow(SW_SHOW);

But it showing dubug assertion error.

---

above code is wrong..

Do one thing,

Although It is not good practice but for your work tobe done,
follow below steps..

1. Take a global variable

CDialog1 *g_dlg; in Dialog1.cpp.

2. in CDialog1 Constructor wrote below line

g_dlg = this;


3. Make it extern CDialog1 *g_dlg; in Dialog2.cpp.

and use below code for Button click in Dialog2.cpp

void CDialog2::OnButton1()
{
this->ShowWindow(SW_HIDE);
g_dlg->ShowWindow(SW_SHOW);
}

This will work for you.

Sorry to say, Priya you have to learn MFC more.

Quote:

---

Originally Posted by ajbharani

Something like this

Code:

---

void CDialog1::OnButton1()
{
    CDialog2 *dia2 = new CDialog2();   
    dia2->Create(IDD_DIALOG2);
    dia2->ShowWindow(SW_SHOW);
}

---

---

No, not like that, if you don't want to leak memory. Make the pointer to the dialog a member of the class.

Code:

---

class CDialog1
{
  CDialog2 *m_dia2;
};

CDialog1::CDialog1()
{
  m_dia2 = NULL;
}

void CDialog1::OnButton1()
{
    if(m_dia2 == NULL)
        m_dia2 = new CDialog2();

    if(!m_dia2->Create(IDD_DIALOG2))
    {
        delete m_dia2;
        m_dia2 = NULL;

        // show error
    }

    m_dia2->ShowWindow(SW_SHOW); // or perhaps first call SW_SHOW and second call SW_HIDE
}

---

Quote:

---

Originally Posted by cilu

No, not like that, if you don't want to leak memory. Make the pointer to the dialog a member of the class.

Code:

---

class CDialog1
{
  CDialog2 *m_dia2;
};

CDialog1::CDialog1()
{
  m_dia2 = NULL;
}

void CDialog1::OnButton1()
{
    if(m_dia2 == NULL)
        m_dia2 = new CDialog2();

    if(!m_dia2->Create(IDD_DIALOG2))
    {
        delete m_dia2;
        m_dia2 = NULL;

        // show error
    }

    m_dia2->ShowWindow(SW_SHOW); // or perhaps first call SW_SHOW and second call SW_HIDE
}

---

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Ok. Nice piece of information. Thnks :)