InputBox using WinAPI

Sample Image - InputBox.jpg

Introduction

Do you know VB's InputBox? Me too. =)

So, this class is for those people who need VB-like InputBox in VC++.

Usage

The usage of this class is very easy:

Add InputBox.h and InputBox.cpp into your project, include InputBox.h to the file where you suppose to use Inputbox and:

#include "InputBox.h"

...

CInputBox ibox(hWndParent);
if (ibox.DoModal("Caption", "Prompt")) 
  MessageBox(NULL, ibox.Text, "Title", MB_OK);

In the constructor, you have to provide a valid hwnd of the parent window. Function DoModal(...) returns TRUE if button OK is pressed and FALSE if button Cancel.

CInputBox doesn't need resource file. You can use it with MFC or without one.

That's all.

License

This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

A list of licenses authors might use can be found here

About the Author

mah

Web Developer

Russian Federation

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My vote of 5

kod1

23:36 21 Mar '12

Thanks a lot, I've been searching for this for a very long time.
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My vote of 5

Sunny1270

2:57 8 Jan '12

Works great for years in my project!
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Thou Shalt Not ...

DogWalker

20:11 13 Sep '03

I believe that Thou Shalt Not DestroyWindow(hwnd) Whilst Thou Handles the WM_DESTROY message for that very hwnd, or BSOD.
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Another bug: GetClassInfoEx()

Michael Geary

19:28 4 Sep '03

This code doesn't look like it will work:

    if (!GetClassInfoEx(hInst, "InputBox", &wcex))
    {
        wcex.cbSize = sizeof(WNDCLASSEX); 
        ...
    }

GetClassInfoEx() requires the cbSize field to be set before the call:

    wcex.cbSize = sizeof(WNDCLASSEX); 
    if (!GetClassInfoEx(hInst, "InputBox", &wcex))
    {
        ...
    }

-Mike

Great! But...

Simon Hofverberg

23:37 18 Dec '02

Thanks a lot, I really needed a non-MFC InputBox, since I was launching it from a worker thread (don't do that with MFC).

I have some comments however... I can't see how anyone has got it working without modifying the destroying procedure. You send WM_DESTROY to the window, and then the window procedure calls DestroyWindow on itself. But calling DestroyWindow will send a WM_DESTROY to the window, which calls DestroyWindow on itself, etc etc etc -> stack overflow OMG | :OMG:

Also, the WM_DESTROY handler calls PostQuitMessage, which seems a little dangerous...

The proper way (IMHO) is to call DestroyWindow in the DoModal method on VK_RETURN or VK_ESCAPE, and then just return 0 or 1 from in there (without requiring GetMessage to fail).

That would look something like this (DoModal):

    while (GetMessage(&msg, NULL, 0, 0)) 
    {       
        if (msg.message == WM_KEYDOWN) 
        {
            if (msg.wParam == VK_ESCAPE)
            {
                EnableWindow(m_hWndParent, TRUE);
                SetForegroundWindow(m_hWndParent);
                DestroyWindow(m_hWndInputBox);
                return IDCANCEL;
            }
            if (msg.wParam == VK_RETURN)
            {
                int nCount = GetWindowTextLength(m_hWndEdit);
                nCount++;
                if (Text) 
                {
                    delete[] Text;
                    Text = NULL;
                }
                Text = new TCHAR[nCount];
                GetWindowText(m_hWndEdit, Text, nCount);
                EnableWindow(m_hWndParent, TRUE);
                SetForegroundWindow(m_hWndParent);
                DestroyWindow(m_hWndInputBox);
                return IDOK;
            }
            if (msg.wParam == VK_TAB)
            {
                hWndFocused = GetFocus();
                if (hWndFocused == m_hWndEdit) SetFocus(m_hWndOK);
                if (hWndFocused == m_hWndOK) SetFocus(m_hWndCancel);
                if (hWndFocused == m_hWndCancel) SetFocus(m_hWndEdit);
            }
            
        }
        TranslateMessage(&msg);
        DispatchMessage(&msg);      
    }

And in the window procedure:

        case WM_DESTROY:
            DeleteObject(m_hFont);
            return DefWindowProc(hWnd, message, wParam, lParam);
 
        case WM_CLOSE:
            PostMessage(m_hWndInputBox, WM_KEYDOWN, VK_ESCAPE, 0);
            break;

Anyway, thanks again!

/Simon

This is not a signature

Re: Great! But...

mah

23:49 18 Dec '02

Yes, Simon, you are right. =) I just didn't find my inner strength to post update here (or it was my laziness?). Anyway thank you, Simon.
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Great

Mel

2:05 14 Jun '02

This is just what I've been looking for. I like it! I ported it to WinCE and it works great! Only had to make the box narrower to fit WinCE's small window.
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Hehe

Nish - Native CPian

0:12 13 Jun '02

I wrote the MFC and .NET versions and hey presto, someone comes up with a API only vesion Talk about InputBox overkill, eh? Nish p.s. If someone writes a WTL version a few people are gonna go raving mad *Author of the romantic comedy* Summer Love and Some more Cricket [New Win] *Buy it, read it and admire me*
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Re: Hehe

mah

0:38 13 Jun '02

Very funny!
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Re: Hehe

Nish - Native CPian

1:08 13 Jun '02

mah wrote: Very funny Thanks. It was meant to be funny and I am glad you understood that Nish *Author of the romantic comedy* Summer Love and Some more Cricket [New Win] *Buy it, read it and admire me*
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Re: Hehe

mah

1:26 13 Jun '02

Thanks for your joke, Nish. I am glad that you are glad =) mah
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Re: Hehe

brad W

6:51 13 Jun '02

Not overkill at all -- nice work. API-only has obvious advantages over MFC dependence.
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Re: Hehe

Nish - Native CPian

14:07 13 Jun '02

brad W wrote: Not overkill at all -- nice work. API-only has obvious advantages over MFC dependence. Yes, I agree. Anyway me and the author were only kidding each other *Author of the romantic comedy* Summer Love and Some more Cricket [New Win] *Buy it, read it and admire me*
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Re: Hehe

Andrew Peace

12:55 11 Jul '02

I also wrote an MFC version after you'd written yours, not realising that you'd done an article covering that topic alread. You can read it here if you're interested . -- Andrew.
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Re: Hehe

Nishant S

14:45 11 Jul '02

Yeah, I've seen it Andrew. I think there are a couple of other versions here on CP too, though mine was the first one Mine is derived from CFrameWnd Nish *Author of the romantic comedy* Summer Love and Some more Cricket [New Win] Review by Shog⁹ Click here for review[NW]
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Re: Hehe

Andrew Peace

7:08 12 Jul '02

Nishant S wrote: though mine was the first one I was looking at the last updated date, you'll see mine was posted in June 2001... . I haven't done any editing tricks or anything either (I wouldn't do that). Not that it matters of course, I'm just pulling your leg. -- Andrew.
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Re: Hehe

Nishant S

14:08 12 Jul '02

Andrew Peace wrote: I'm just pulling your leg. Heheh I know Nish *Author of the romantic comedy* Summer Love and Some more Cricket [New Win] Review by Shog⁹ Click here for review[NW]
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Re: Hehe

Tim Smith

14:26 11 Jul '02

Should I pull out my old Forth compiler and hack out a version in that? Smile | :)

Tim Smith

I know what you're thinking punk, you're thinking did he spell check this document? Well, to tell you the truth I kinda forgot myself in all this excitement. But being this here's CodeProject, the most powerful forums in the world and would blow your head clean off, you've got to ask yourself one question, Do I feel lucky? Well do ya punk?

Re: Hehe

Nishant S

14:46 11 Jul '02

Tim Smith wrote: Should I pull out my old Forth compiler and hack out a version in that? LOL Maybe Chris will add a full section just for InputBox controls Nish *Author of the romantic comedy* Summer Love and Some more Cricket [New Win] Review by Shog⁹ Click here for review[NW]
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