C / C++ / MFC

How to work with controls in MFC?

8-Oct-06 7:13

I think you can find your answer on www.Codeguru.com I think it has an article about exe files

WhiteSky

Lord Kixdemp7-Oct-06 19:11

7-Oct-06 19:11

Hello everybody!
I can't seem to find a reference on how the hell to do a simple operation like setting a control's "Enabled" to false... (ie, "gray" it out) In C# all you have to do is controlId.Enabled = false;, but MFC seems to handle things different... I'm being a complete n00b, but oh well... Poke tongue | ;-P

Thanks!

Windows Calculator told me I will die at 28. Frown | :(

Hamid_RT7-Oct-06 19:28

7-Oct-06 19:28

For disable or enable you can use EnableWindow but if you want to work with controls you can declare variables for them.For example use of a Button you can declare CButton m_Button; and then m_Button.Functions Is this your question?

WhiteSky

Lord Kixdemp7-Oct-06 20:12

7-Oct-06 20:12

Looks like just what I wanted Big Grin | :-D

, but it doesn't work... Frown | :(

It gives me an assertion error on file winocc.cpp:297... My code is as follows:

At the end of CMyDlg::OnInitDialog()
<code>
	// TODO: Add extra initialization here

	AfxMessageBox(_TEXT("Hey!"), 0, 0);

	m_makeKiller.SetDlgCtrlID(IDC_MAKE_KILLER);
	m_makeKiller.EnableWindow();
</code>

And the beginning of the class declaration:

<code>class CMyDlg : public CDialog
{
private:
		CButton m_makeKiller;</code>
...
<code>}</code>

What's wrong with that? I don't recall changing anything else except event handlers... Thanks! Wink | ;)

Windows Calculator told me I will die at 28. Frown | :(

Hamid_RT7-Oct-06 21:10

Re: How to work with controls in MFC? [modified]

7-Oct-06 21:10

CButton m_Button;
m_Button.Create("Button",WS_CHILD|WS_VISIBLE,CRect(0,0,100,23),this,1);
m_Button.EnableWindow(1);
Its working

How to create your button?

WhiteSky

Lord Kixdemp8-Oct-06 6:14

8-Oct-06 6:14

Hmm... Yeah, but how do I do that with the designer? Frown | :(

Thanks!

[edit]
Nevermind, this works! Big Grin | :-D

m_makeKiller = reinterpret_cast<CButton*>( GetDlgItem(IDC_MAKE_KILLER));
m_makeKiller->EnableWindow(0);

[/edit]

-- modified at 12:21 Sunday 8th October, 2006

Windows Calculator told me I will die at 28. Frown | :(

Hamid_RT8-Oct-06 7:14

8-Oct-06 7:14

Is your problem solving? Smile | :)

and if you have a variable for your button you can use form it

WhiteSky

Mark Salsbery8-Oct-06 8:47

Mark Salsbery

8-Oct-06 8:47

>>Yeah, but how do I do that with the designer?

If you want it disabled by default...

Highlight the control, press F4 for the properties window, and change the Disabled property to
TRUE.

Mark

Lord Kixdemp9-Oct-06 10:16

Change cursor image(Win 32 Application -Helloworld)

9-Oct-06 10:16

Alright! That solved it, thanks you two! Wink | ;-)

Windows Calculator told me I will die at 28. Frown | :(

TranQuangNhat7-Oct-06 19:01

TranQuangNhat

7-Oct-06 19:01

Please tell how to change the cursor when i move it into rectangle (100,100,200,200).
Thank you for helping

all for development

Re: Change cursor image(Win 32 Application -Helloworld)

Hamid_RT7-Oct-06 19:30

Re: Change cursor image(Win 32 Application -Helloworld)

7-Oct-06 19:30

Do you need to LoadCursor and SetCursor?

WhiteSky

TranQuangNhat8-Oct-06 1:20

TranQuangNhat

8-Oct-06 1:20

//Win 32 Application
//Hello world program

CALLBACK Winproc(HWND,Message,wParam,lParam)
Switch(wId)
...
....
case WM_MOUSE:
if(condition)
{
HWND hCursor=LoadCusor(hInst,(LPSTR)IDI_NEWCURSOR);
SetCurspr(hCursor);
else
.......
When condition ==1 ,the cursor not change.
Help me.

all for development

Re: Change cursor image(Win 32 Application -Helloworld)

Hamid_RT8-Oct-06 2:13

Re: Change cursor image(Win 32 Application -Helloworld)

8-Oct-06 2:13

I want to help you but what question?

WhiteSky

Michael Dunn8-Oct-06 11:26

Michael Dunn

8-Oct-06 11:26

Handle WM_SETCURSOR and if the cursor is within that rect, call SetCursor() to change it.

--Mike--
Visual C++ MVP Cool | :cool:

LINKS~! Ericahist | PimpFish | CP SearchBar v3.0 | C++ Forum FAQ

Basic handles question

Oliver1237-Oct-06 12:03

Oliver123

7-Oct-06 12:03

I've conclued I don't really know how to get handles to objects in VC++. They are referred to all the time, and I get the idea they are one of the basic tools of VC++ along with pointers. The books and manuals all talk about handles, but presume the reader is bright enough to know how they all work. I'm not. (Someone who knows what they are doing could write a great article titled, "Handles for Beginners")
So.....

Suppose I have:

dialog: CTestDlg
edit control: IDC_EDIT1
member function: CTestDlg::FuncTest

Exactly how would one get handles to any or all of these? I suspect one starts with
"HWND hHandle = ???????"
But what goes on the right side of the expression?
Thanks.

Mike_V7-Oct-06 12:43

Mike_V

7-Oct-06 12:43

Handles are a Windows concept - they are just used in VC because VC normally is used for Windows programming. They are similar to a pointer in that they store an index into some internal table. By looking up that index, Windows can find the actual data that manages the window. But as far as you are concerned, a handle is just some opaque number you can pass around to various Windows functions.

For the dialog - there should be something like pTestDlg->getHwnd() or whatever the MFC equivalent is.

To get a handle to a control, call ::GetDlgItem(hDialog, IDC_EDIT1); where hDialog is an HWND obtained by using a method above. Alternatively, if IDC_EDIT1 is represented by an MFC class, just call the getHwnd equivalent on that class.

Member functions cannot have handles. A handle is used by Windows - but a member function is just a special type of function. You can create a pointer to a member function, but the syntax is ugly and very limited as to what you can do. Or you can search for fastdelegate on CodeProject to find a member function pointer wrapper.

Mike

Angbo20067-Oct-06 20:12

Angbo2006

7-Oct-06 20:12

Hi,

I dont know what exactly do you need by I am suspecting you want to get a HANDLE to the IDC_EDIT control. If this is the case,

You can use the following

CWND* pwnd=this->GetDlgItem(IDC_EDIT1);

it will return a pointer to that EDIT CONTROL. But this is CWND pointer; if you need the HWND then
CWND has a member variable m_hwnd which is public.

So

HWND handle=pwnd->m_hwnd;

But I guess, if you are using MFC, the pwnd is enough to do something to the window like writing a text, for example.

pwnd->SetWindowText("Text");

Regards,

Angbo2006

Hamid_RT8-Oct-06 7:14

8-Oct-06 7:14

Is this[^] your purpose?

WhiteSky

Oliver1238-Oct-06 9:25

Oliver123

8-Oct-06 9:25

Thanks for the help. I didn't have an immediate and particular need, but I simply recognized a deficiency in my understanding of how to get a handle. So, I try to formulate a tight question that will shed some light. When I see correct code that does something, and understand its intent, then I can backtrack through the manuals and get a full understanding. (I guess that is my learning style.) I found the four volume MFC reference library in a used book store for $2 each, and have been reading about all these great classes and functions. However, the difficulty arises in understanding exactly how to write the code to get the required arguments for the functions.

Thanks again

Full Screen

Waldermort7-Oct-06 8:47

Waldermort

7-Oct-06 8:47

Could somebody please point me towards the correct set of functions to create a full screen window. I have a window ( 800 x 600 ) which I need to view in full screen, but I will need to change the screen resolution in order to this. All the articles I have found so far simply resize the window and remove the titlebar. This is not the effect I want. I should also note this has to be done without MFC or ActiveX.

Hamid_RT7-Oct-06 9:10

7-Oct-06 9:10

Can you explain I guess your question isnt for a change simple size Smile | :)

WhiteSky

Waldermort7-Oct-06 14:10

Waldermort

7-Oct-06 14:10

The window has a bitmap skin, so really resizing isn't an option. In order for the window to become full screen I will also need to change the resolution to match that of the bitmap. I have seen this done with lots of games, so I know it's possible, I just don't know how.

Link20067-Oct-06 14:34

Link2006

7-Oct-06 14:34

In the CreateWindow function, the third parameter is the window sytle, change it to:

WS_EX_TOPMOST | WS_POPUP | WS_VISIBLE

Like this (in WIN32):

<br />
wndHandle = CreateWindow (<br />
		TEXT("Full screen"), <br />
		TEXT("Full Screen"), <br />
		WS_EX_TOPMOST | WS_POPUP | WS_VISIBLE,<br />
		CW_USEDEFAULT, <br />
		CW_USEDEFAULT, <br />
		1280, <br />
		1024,<br />
		NULL, <br />
		NULL, <br />
		hInstance, <br />
		NULL );<br />

Hope that helps.

Waldermort7-Oct-06 14:39

Waldermort

7-Oct-06 14:39

That will allow me to place the window over the Task bar, but I still need to change the resolution of the screen, and be able to restore it later. I'm currently searching for an easy way to do this.