C / C++ / MFC

1-Nov-09 8:56

Hi again,

Can someone be helpful and show me a link or a piece of code that allows me to insert into my code so when the user clicks the X button at the top of the client so a message box appear and says "Are you sure you want to exit" along with the event.

Thanks

Andrew McIntyre

«_Superman_»1-Nov-09 9:24

Re: Exit Message Box [modified]

1-Nov-09 9:24

Handle the WM_CLOSE[^] message for the window.
You can put your message box in this handler.

«_Superman_»
I love work. It gives me something to do between weekends.

Microsoft MVP (Visual C++)

MrMcIntyre1-Nov-09 9:33

1-Nov-09 9:33

switch (message)<br />
    {<br />
        case WM_CLOSE:<br />
        MessageBox(NULL, "Are you sure you want to exit?", "Exit", MB_YESNO | MB_ICONEXCLAMATION);<br />
        DestroyWindow(hwnd);<br />
        break;<br />
    }

Can someone help me find a missing identifier and show me where I have to put it.

Thanks

Andrew McIntyre

modified on Sunday, November 1, 2009 3:39 PM

«_Superman_»1-Nov-09 9:46

1-Nov-09 9:46

case WM_CLOSE:
    if (MB_YES == MessageBox(hwnd, _T("Are you sure you want to exit?"), _T("Confirmation"), MB_YESNO))
        DestroyWindow(hwnd);

    return 0;

For MFC it could look like this -

void CYourClass::OnClose()
{
    if (MB_YES == MessageBox(hwnd, _T("Are you sure you want to exit?"), _T("Confirmation"), MB_YESNO))
        DestroyWindow(hwnd);
}

«_Superman_»
I love work. It gives me something to do between weekends.

Microsoft MVP (Visual C++)

MrMcIntyre1-Nov-09 9:57

1-Nov-09 9:57

Hi. I think I've done something wrong somewhere.

#include <windows.h><br />
<br />
//Global Definitions<br />
#define WINDOW_WIDTH 1040<br />
#define WINDOW_HEIGHT 750<br />
<br />
//Global Variables<br />
const char lpClassName[] = "My Project";<br />
HWND mainWindow;<br />
<br />
//Function Declarations<br />
LRESULT CALLBACK WindowEvent(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam);<br />
<br />
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd)<br />
{<br />
	//Create The Window Class<br />
	WNDCLASSEX wc;<br />
	wc.style = CS_VREDRAW | CS_HREDRAW;<br />
	wc.lpszMenuName = NULL;<br />
	wc.lpszClassName = lpClassName;<br />
	wc.lpfnWndProc = WindowEvent;<br />
	wc.hInstance = hInstance;<br />
	wc.hIconSm = LoadIcon(NULL, IDI_APPLICATION);<br />
	wc.hIcon = LoadIcon(NULL, IDI_APPLICATION);<br />
	wc.hCursor = LoadCursor(NULL, IDC_ARROW);<br />
	wc.hbrBackground = (HBRUSH) GetStockObject(BLACK_BRUSH);<br />
	wc.cbWndExtra = 0;<br />
	wc.cbSize = sizeof(wc);<br />
	wc.cbClsExtra = 0;<br />
<br />
	//Register The Windows Class<br />
	RegisterClassEx(&wc);<br />
<br />
	//Create the Window<br />
	mainWindow = CreateWindowEx(<br />
		NULL,<br />
		lpClassName,<br />
		"My Project",<br />
		WS_OVERLAPPEDWINDOW | WS_VISIBLE,<br />
		(GetSystemMetrics(SM_CXSCREEN) / 2) - (WINDOW_WIDTH / 2),<br />
		(GetSystemMetrics(SM_CYSCREEN) / 2) - (WINDOW_HEIGHT / 2),<br />
		WINDOW_WIDTH,<br />
		WINDOW_HEIGHT,<br />
		NULL,<br />
		NULL,<br />
		hInstance,<br />
		NULL<br />
		);<br />
<br />
	//Make Sure The Window Was A Success<br />
	if (!mainWindow)<br />
		return 0;<br />
<br />
	//Update the Window<br />
	UpdateWindow(mainWindow);<br />
<br />
	//The Main Loop<br />
	MSG msg;<br />
<br />
	while (1)<br />
    {<br />
        if (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE))<br />
        {<br />
            if (msg.message == WM_QUIT)<br />
                TranslateMessage(&msg);<br />
            DispatchMessage(&msg);<br />
        }<br />
    }<br />
    return (int) msg.wParam;<br />
}<br />
//Callback Function (WindowEvent)<br />
LRESULT CALLBACK WindowEvent(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)<br />
{<br />
    switch (message)<br />
    {<br />
        case WM_CLOSE:<br />
    if (MB_YES == MessageBox(hwnd, _T("Are you sure you want to exit?"), _T("Confirmation"), MB_YESNO))<br />
        DestroyWindow(hwnd);<br />
<br />
    return 0;<br />
        break;<br />
    }<br />
    return DefWindowProc(hWnd, message, wParam, lParam);<br />
}

Andrew McIntyre

«_Superman_»1-Nov-09 10:00

1-Nov-09 10:00

You really must do this on your own.
Change the first parameter of MessageBox from hwnd to hWnd.

«_Superman_»
I love work. It gives me something to do between weekends.

Microsoft MVP (Visual C++)

MrMcIntyre1-Nov-09 10:04

1-Nov-09 10:04

I got three compile errors:

'MB_YES' : undeclared identifier
'_T': identifier not found
'_T': identifier not found

Andrew McIntyre

MrMcIntyre1-Nov-09 10:48

1-Nov-09 10:48

Can someone help me with those errors.

Please

Andrew McIntyre

hxhl951-Nov-09 13:16

hxhl95

1-Nov-09 13:16

MessageBox Function()[^]

Look under the return value section for what you're looking for.

_T("") is a text macro, you can try TEXT("") if it's not defined. If both are undefined, just don't use it. (put function("text here") instead of function(_T("text here")))

David Crow2-Nov-09 2:58

2-Nov-09 2:58

MrMcIntyre wrote:
if (MB_YES == MessageBox(hwnd, _T("Are you sure you want to exit?"), _T("Confirmation"), MB_YESNO))
DestroyWindow(hwnd);

hwnd has not been declared.

"Old age is like a bank account. You withdraw later in life what you have deposited along the way." - Unknown

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MrMcIntyre2-Nov-09 10:52

2-Nov-09 10:52

Hi. I fixed the other 2 errors just one last error to fix.

if (MB_YES == MessageBox(hWnd, ("Are you sure you want to exit?"), ("Confirmation"), MB_YESNO))<br />
DestroyWindow(hWnd); <br />
    else <br />
        return 0;

The error was:

'MB_YES' : undeclared identifier

Andrew McIntyre

David Crow2-Nov-09 10:54

Re: Exit Message Box [modified]

2-Nov-09 10:54

Read the docs for MessageBox(), specifically the return value

MrMcIntyre2-Nov-09 10:59

2-Nov-09 10:59

Can you create a quick snippet of how the code should look like.

Andrew McIntyre

modified on Monday, November 2, 2009 5:17 PM

David Crow2-Nov-09 11:04

2-Nov-09 11:04

MrMcIntyre wrote:
That is the right code...

Andrew, if it was right the compiler would not be complaining.

MrMcIntyre wrote:
...its just the undeclared identifer I need fixed.

What is it that you think MessageBox() needs to return?

MrMcIntyre2-Nov-09 11:26

2-Nov-09 11:26

Where can I find the documentation from?

Andrew McIntyre

MrMcIntyre2-Nov-09 11:28

2-Nov-09 11:28

Its ok. I fixed it. You guy's are the best. Thanks

Andrew McIntyre

David Crow2-Nov-09 16:43

making calculator using MFC c++

2-Nov-09 16:43

Other than the link I provided, I'm not sure.

goutom roy1-Nov-09 8:19

goutom roy

1-Nov-09 8:19

i am new in c++ MFC.i want to make a simple calculator using mfc with user interface . may i have a ready source code from u friend or any suggesion? please send me full source code.i want to analyse it. plzzzzzzzzzzzzzz........

Re: making calculator using MFC c++

«_Superman_»1-Nov-09 8:47

Re: making calculator using MFC c++

1-Nov-09 8:47

You should try to do it on your own.
Such questions are not appreciated in the forums.
You will never get what you're looking for if you post such questions.

There are many articles and resources available on the internet.
Search and read them and a simple calculator is a fairly easy task.

All the best. Thumbs Up | :thumbsup:

«_Superman_»
I love work. It gives me something to do between weekends.

Microsoft MVP (Visual C++)

CPallini1-Nov-09 9:59

CPallini

1-Nov-09 9:59

goutom roy wrote:
i am new in c++ MFC.i want to make a simple calculator using mfc with user interface . may i have a ready source code from u friend or any suggesion? please send me full source code.

Why do you stop on requesting the full source code? Why should you, smart developer, accomplish the boring task of compilation? Ask for an already compiled, full functional application, instead! I can even help you on this: if you give me your e-mail address then I'm going to sent you the binaries of the Windows Calculator.
Smile | :)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke

[My articles]

Re: making calculator using MFC c++

David Crow2-Nov-09 3:03

2-Nov-09 3:03

goutom roy wrote:
.i want to make...may i have a ready source code

Those two statements are contradictory. If we give it to you, you've not made it. How would that look if you went around bragging to all your friends that you made this wonderful calculator when in fact, you simply just took the code and added your name to it?

filehandling

khomeyni1-Nov-09 5:36

khomeyni

1-Nov-09 5:36

in the name of allah
hello
i want to find all the files name in a directory and then delete all the files that are copies :
a.txt a(copy).txt: a(copy).txt must be deleted.
how i can find the name of files with c++ commands and how i can delete them .
also my os is linux if it is relative to os.i dont know that if i write in a correct thread?
valhamdolelah.

Re: filehandling

«_Superman_»1-Nov-09 6:41