C / C++ / MFC

9-May-04 4:44

I would like to know how create child windows at runtime and get them all displyed
Yes I've used:

a pointer for the control
the new operator for the window type
CWnd::Create method
CWnd::ShowWindow method
CWnd::MoveWindow method

All I'm getting is a blank dialog box. I can't understand why.

What do I have to do display them?

Jens Doose10-May-04 0:11

Dymanic windows (clarified)

10-May-04 0:11

Please show us a little bit of your source code...

Alton Williams13-May-04 3:29

Re: Dymanic windows (clarified)

13-May-04 3:29

This is a snippets of my code
in the dialog header file

class CMyDialouge : public CDialog{<br />
public CEdit *m_EditWnd;<br />
CRect m_WndRect;<br />
};

The dialog's constructor

CMyDialouge::CMyDialouge(CWnd* pParent /*=NULL*/)<br />
	: CDialog(CMyDialogue::IDD, pParent)<br />
{<br />
m_EditWnd = NULL;<br />
m_Rect = CRect(23,30,54,14);<br />
}<br />

Create 5 versions of the edit control

BOOL CMyDialouge::OnInitDialog()<br />
{<br />
	// TODO: Add extra initialization here<br />
	this->m_EditWnd = new CEdit[5];<br />
	<br />
	for(int i = 0; i < 5; i++)<br />
	{<br />
		m_EditBox[i].Create(WS_CHILD|ES_MULTILINE| WS_VISIBLE|ES_WANTRETURN,CRect(0,0,0,0),this,1000 + i);<br />
		m_EditWnd[i].MoveWindow(m_Rect);<br />
		m_EditWnd[i].ShowWindow(SW_SHOW);<br />
<br />
		m_Rect.top += 30;<br />
	}<br />
	return TRUE;  // return TRUE  unless you set the focus to a control<br />
<br />
}

void CMyDialouge::OnDestroy<br />
{<br />
	for (int i=0; i <5; i++)<br />
		m_EditWnd[i].DestroyWindow();<br />
<br />
	CDialog::OnDestroy();<br />
	<br />
	// TODO: Add your message handler code here<br />
	delete[] m_EditWnd;<br />
}<br />

I hope I've clarified it.
Thanks Alton

Jens Doose13-May-04 3:39

Re: Dymanic windows (clarified)

13-May-04 3:39

In CMyDialouge::OnInitDialog() you wrote

m_EditBox[i].Create(WS_CHILD|ES_MULTILINE| WS_VISIBLE|ES_WANTRETURN,CRect(0,0,0,0),this,1000 + i);
m_EditWnd[i].MoveWindow(m

You used m_EditBox AND m_EditWnd, may it be that this is your mistake?

Jens

Alton Williams13-May-04 4:08

Re: Dymanic windows (clarified)

13-May-04 4:08

Jens Doose13-May-04 4:44

13-May-04 4:44

You used CRect(23,30,54,14); as the location to move the window to.

This statement create a rect with the following settings:

-	m_Rect	{top=30 bottom=14 left=23 right=54}
-	tagRECT	{top=30 bottom=14 left=23 right=54}
	left	23
	top	30
	right	54
	bottom	14

Since "bottom" is less than "top" this is a rect with a negativ height.
I am pretty sure that was not your intention, was it? Wink | ;-)

Jens

David Crow10-May-04 3:07

David Crow

10-May-04 3:07

Most of the time, creating controls at runtime is not necessary. Can you explain a bit more of what you are doing?

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

Alton Williams13-May-04 3:33

13-May-04 3:33

I just wanted to play around with dynamic controls
I've given code snippets in the reply before yours.

Thanks Alton

marcosvpp10-May-04 5:54

marcosvpp

10-May-04 5:54

Yes, I understand!! I'm trying to create a MenuBar at runtime but all itens in the menu is GRAYED (disabled) when created!!! I don't know why?!?!?

Maybe some help in your doubt helps in mine!!!
Smile | :)

Thanks

Marcos Vinícius

Jens Doose13-May-04 3:46

13-May-04 3:46

If your using MFC one of the more common mistakes is that there is no command handler yet. In that case MFC grayes all the unavailable menu commands.

Jens

How to move caret around in characters in an Edit control?

Marcos Vinícius13-May-04 4:51

Marcos Vinícius

13-May-04 4:51

But, why is it unavailable? I can't just put a Message_Map in my class that handle the App MenuBar and that will enable the MenuItens?

Take a look in my last thread posted:
Menu at runtime (dynamic menu)

Thanks.

Marcos Vinícius

Newbie DLL Question

Hagiel9-May-04 4:37

Hagiel

9-May-04 4:37

okay here it goes ...

my app crashes cause of a DLL (coded correctly)
my DLL is accessing to a file, only to read ...
isn't it allowed to a dll to read a file? how to fix it ?

is there maybe another error?
Its a simply Win32 dll with CPP, Header and Def file
and my app is a console app (MFC apps crash too)

the debugger links me to "output.c"

if i write other console apps it crashes too ...

can any1 help me?

int main(int argc, char* argv[])<br />
{<br />
	if (argc < 2)<br />
	{<br />
		printf ("Usage is: <CharFile> \n");<br />
		getchar();<br />
		return 1;<br />
	}<br />
	char * output = "";<br />
	char hash[5] = "abcd"; // Some Decoding hash<br />
	char * outputfile = "";<br />
	sprintf(outputfile,"%s.txt",argv[1]);<br />
	FILE * fp = fopen(argv[1],"r");<br />
	FILE * f = fopen(outputfile,"wt");<br />
<br />
	if (!fp)<br />
	{<br />
		printf ("Error opening file %s\n", argv[1]);<br />
		getchar();<br />
		return 2;<br />
	}<br />
	int findex = 0;<br />
	unsigned char d;<br />
	while (!feof(fp)) <br />
	{<br />
        int c = fgetc(fp);<br />
        if (c == EOF) break;<br />
        unsigned char k = (hash[findex % 4] + findex) % 256;<br />
        d = c ^ (k | 0x80);<br />
		findex++;<br />
		output += (char) d;<br />
		fprintf(f,(const char *) d);<br />
	}<br />
	fclose(fp);	<br />
	fclose(f);<br />
	return 0;<br />
}

Gary Shen9-May-04 4:33

Gary Shen

9-May-04 4:33

How can I move the caret in an CEdit control forward or backward in characters, not in coordinates?

SmileAgain

Re: How to move caret around in characters in an Edit control?

Ravi Bhavnani9-May-04 6:24

Ravi Bhavnani

9-May-04 6:24

Perhaps CEdit::SetSel (nCharPos, nCharPos, TRUE) ?

/ravi

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Splitter window question

Chakrdeep9-May-04 3:15

Chakrdeep

9-May-04 3:15

Hi,

I want to create the following splitters.

1. ParentSplitter - 2 cols and 1 row (vertical split)
- derives from CFrameWnd-SDI based
- 1st pane has a class derived from CTreeView (so this will be SDI-based)
- 2nd pane should be ChildSplitter

2. ChildSplitter - 2 rows and 1 col (horizontal split)
- derives from CMDIChildWnd-MDI based
- 1st pane and 2nd pane will derive from CFormView

So basically I want the parent to be SDI-based as its 1st pane (the TreeView) is SDI-based but its 2nd pane needs to be a MDI-based splitter. this application should look more or less like visual studio 6 having a tree on the left pane and double-clicking on a file should open a new window on the right pane ...

Can this be done? .. or is there any work-around for this concept .. If so can anyone plz guide me ...

thanks a lot

Re: Splitter window question

Ravi Bhavnani9-May-04 4:22

Ravi Bhavnani

9-May-04 4:22

I faked this by creating a standard MDI app, using a docking window for the tree view. My "tree view" is actually a dialog template that houses a tab control, which displays various views (tree, list) of the open "project". It seems you're trying to do the same thing.

/ravi

My new year's resolution: 2048 x 1536
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IP lister...

S^nyp9-May-04 3:03

S^nyp

9-May-04 3:03

I made a simple prog in console that listed ALL the ip's that are possible... don't ask, and I stumbled onto a problem, I was storing those ip's into a txt file, but when the ip's were only on 1.0.0.0 the txt file was aproximatly 200mb, you know .2gb, anyways does anyone know how to make that file smaller or is that the smallest I can get?

Actual Linux Penguins were harmed in the creation of this message.

Andrew Walker9-May-04 3:25

Andrew Walker

9-May-04 3:25

There are a few ways I can think of, but it's hard without more information.

1. Don't store it as text, save them as binary groups of four bytes
2. Only store the changes between each digit (0.0.0.[x0, x1, .. x254, x255], 0.0.1.[x0, x1, .. x254, x255], ...)
3. Don't save them at all, just generate them on the fly, this would be ideal but it depends on your situation.

If you can keep you head when all about you
Are losing theirs and blaming it on you;
If you can dream - and not make dreams your master;
If you can think - and not make thoughts you aim;
Yours is the Earth and everything that's in it.

Rudyard Kipling

Ravi Bhavnani9-May-04 4:25

Ravi Bhavnani

9-May-04 4:25

Snyp wrote:
ALL the ip's that are possible...

I second Andrew's suggestion: there's no need to store these on disk - simply generate them on the fly.

/ravi

My new year's resolution: 2048 x 1536
Home | Articles | Freeware | Music
ravib@ravib.com

S^nyp9-May-04 4:28

S^nyp

9-May-04 4:28

I just wanted to do this for fun, to see what and how large it would be, I have a 30 gig hard drive and I calculated the document to come out aproximatly 50 gigs!!!! Big Grin | :-D

Actual Linux Penguins were harmed in the creation of this message.

Paul Ranson10-May-04 1:13

Paul Ranson

10-May-04 1:13

You know there are 4 billion of them, generating them is like counting from 0-0xffffffff. Uncompressed binary storage would require 16GB.

But making a computer count from 0-4 billion seems rather pointless.

Paul

David Crow10-May-04 3:23

David Crow

10-May-04 3:23

Paul Ranson wrote:
But making a computer count from 0-4 billion seems rather pointless.

That reminds me of the time I had two computers: a Commodore 64 (which had a clock speed of 1.02 MHz), and a 12 MHz AT-Compatible PC. I used to code up identical (sorting) programs in basic and watch them run. Yes it was pointless, and I never understood why the C64 never won at least a few times! It just didn't seem fair.

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)