Retrieving the text from an edit box

Hi ~

I'm trying to use WM_GETTEXT to retrieve the contents of an edit box, "EditTitle".
The syntax for WM_GETTEXT is as follows:

Code:

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WM_GETTEXT wParam = (WPARAM) cchTextMax;
  lParam = (LPARAM) lpszText;

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, where cchTextMax is the amount of characters to be copied, and lpszText is a 'Long pointer to the buffer that is to receive the text.' The problem is that I am not sure how to use this message inside a function call, i.e.

Code:

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SaveTitle(WM_GETTEXT etc)

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Please can someone who has a lot more programming experience than I help me out?

Thanks;

~ Chris Howarth

Do you actually see WM_GETTEXT in msdn?

Quote:

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lResult = SendMessage(
// returns LRESULT in lResult
(HWND) hWndControl,
// handle to destination control
(UINT) WM_GETTEXT,
// message ID
(WPARAM) wParam,
// = (WPARAM) () wParam;
(LPARAM) lParam
// = (LPARAM) () lParam;

);

---

You need SendMessage

Oh yes, I forgot to include that in my code snippet... What i dont get is the Long Pointer to the buffer that is to receive the text. How do I just get it to return a value? :S

try....

Code:

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char            szTitle[256]={'\0'};

GetDlgItemText(hDialog, Edit_Title, szTitle, 255 );

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Quote:

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Originally Posted by novacain

try....

Code:

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char            szTitle[256]={'\0'};

GetDlgItemText(hDialog, Edit_Title, szTitle, 255 );

---

---

Including the null char, so its 256 ;)

Code:

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GetDlgItemText(hDialog, Edit_Title, szTitle, sizeof(szTitle));

---

OK thanks. I'll try that.

Code:

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char  szTitle[256]={'\0'};
        GetDlgItemText(hwnd, EditTitle, szTitle, sizeof(szTitle));

---

I unfortunately get these errors:

Code:

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invalid conversion from 'HWND__*' to 'int'
initialising argument 2 of 'UINT GetDlgItemTextA(HWND__*, int, CHAR*, int)'

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What am I doing wrong?

[Forger's example]

Code:

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    int len = GetWindowTextLength(GetDlgItem(hwnd, IDC_TEXT));
    if(len > 0)
    {
        int i;
        char* buf;

        buf = (char*)GlobalAlloc(GPTR, len + 1);
        GetDlgItemText(hwnd, IDC_TEXT, buf, len + 1);

        //... do stuff with text ...

        GlobalFree((HANDLE)buf);
    }

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The 2nd arg isn't a HWND its the control's resource ID, ie 4000

We can sit here and throw suggestive functions at him all day, but garaunteed he figures this out, he'll just be back tomorrow asking wtf a HWND is. Chrishowarth, before you just decide to "jump into" winapi programming, first learn the basics, i.e. how the Message Queue works and what SendMessage actually does. I'd suggest theForger's winapi tut, you can find it in the stickies at the top of this forum.

Quote:

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Chrishowarth, before you just decide to "jump into" winapi programming, first learn the basics, i.e. how the Message Queue works and what SendMessage actually does. I'd suggest theForger's winapi tut, you can find it in the stickies at the top of this forum.

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I've almost finished my app, and I'm learning more from creating this than I did with the tutorials. Of course I read the tutorials, but making a program is helping me understand it.

Thanks! :); my code does compile now with that function. I'm not quite sure what it returns though, because if i try to use the variable I assign to it I get the error "Invalid convertion from 'UINT' to 'char*'

Look at MSDN then!

It works!!! Thankyou all so much :D Sorry I am a bit slow.

>>"Invalid convertion from 'UINT' to 'char*'

If you get this on a resource ID param then use the macro

MAKEINTRESOURCE()