C / C++ / MFC Discussion Boards

Joaquín M López Muñoz21-Jan-02 11:24

21-Jan-02 11:24

Dialog boxes do not have a GetDocument function, because they're not normally part of the document/view architecture.
As for modal/modeless dialogs, which one to use will depend on your needs: modal dialogs, when started with DoModal, block the rest of the program so that the user can only interact with the dialog until s/he presses "OK" or "Cancel" (the rest of the windows appear disabled and grayed out). Modeless dialogs, on the contrary, coexist with the rest of the app and do not block user input to other windows.
I'd say modal dialogs are simpler to handle for a starter. The way to incorporate a modal dialog into your document/view app could be sketched along these lines:

Let the MFC wizard create a CDialog-based class for your use, and add a CYourDocument * variable that gets initialized on construction time: you will have to add an extra parameter to the constructor of your class, just like this:
```
CYourDlg(CYourDocument * pDoc,CWnd* pParent = NULL);
```
The dialog normally will pop up on response to some command: add a command handler for it, and show the dialog as follows:
```
void CYourFrameWnd::CYourCommand()
{
  CYourDialog dlg(GetDocument());
  dlg.DoModal(); 
}
```

This way you have access to the document from within the code of your CDialog-based class. Hope the explanation has shed some light. The topic is much too broad to give but a small indication to get you started.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: Dialog boxes and Documents

Braulio Dez21-Jan-02 20:59

Braulio Dez

21-Jan-02 20:59

Hi !

Well, one way to solve the document problem that you have is to pass in the DoModal of the Dialog as a parameter your Document ( then you can play with the data inside your dialog having that pointer to the document), just override DoModal in your dialog ( you have to declare that virtual).

Modal dialogs are easier to use ( for the programmer and for the users) than modeless, so maybe better to use modal dialogs whenever is possible and modeless only when is needed.

A good place to look for answers is: http://www.deja.com

HTH
Braulio

Re: VirtualAlloc...?

Joaquín M López Muñoz21-Jan-02 11:03

Joaquín M López Muñoz

21-Jan-02 11:03

If what you're after is having commited pages with increasing contiguous addresses without imposing an a priori limit, you can always reserve the largest block of memory the system allows you to (which is 2GB minus some safeguard amount of memory for the rest of the program and libraries, say 1.8GB). After all, reserving such a huge block of memory costs nothing --the system is only doing some bookkeeping of your request.
It's better to reserve this block of memory as soon as you can, so that the memory hasn't been fragmented by then.
If you run out of memory after consuming the 1.8GB, then there's nothing more you can do: a process cannot simply handle more memory than that.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

MFC: passing structs from one window to another

User 665821-Jan-02 9:14

User 6658

21-Jan-02 9:14

Hi
I hope this question is an easy one for all you experts here at CodeProjetct Smile | :)

I have a dialog based app that launches another modeless dialog in OnInitDialog using Create and ShowWinow. So far everything works.

I declared a new struct using

struct CONFIG
{
   CString one, two, three, andsoon;
}

The main dialog has a member variable named

CONFIG cfg

Now my question:
My second dialog needs to have access to this variable in order to read some values out of it
How do I set it up in order to be able to read values from CONFIG cfg from my second, modeless dialog?

regards
Gregor

modified 12-Sep-18 21:01pm.

Re: MFC: passing structs from one window to another

Joaquín M López Muñoz21-Jan-02 9:23

Joaquín M López Muñoz

21-Jan-02 9:23

Hi Gregor,

If you created the modeless dialog from the main dialog with something like Create(ID_MODELESS_DLG,this) (where this refers to the main dialog) then the modeless dlg has the main one as its parent, and the sentence

((CYourDlg *)GetParent())->cfg

access the variable cfg. Note the casting to CYourDlg * (or whatever your main dialog class is called).

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: MFC: passing structs from one window to another

User 665821-Jan-02 10:10

User 6658

21-Jan-02 10:10

Great!!!!!!

THANKS A LOT!!! Rose | [Rose]

modified 12-Sep-18 21:01pm.

eek, thanks to the author

21-Jan-02 8:47

i used this article http://www.codeproject.com/com/vb_from_vc.asp to call a function from a vb dll but if i created a function with multi params then for some reason my string gets lost!!

I have used this in visual basic:

Sub irc_1_client_init(ByVal what_nick_name As String, ByVal what_server As String, ByVal what_channel As String)

blah

end sub

--------------------------------------------------------------------------------

and in c++ i call the function like this :

irc_clientClass->irc_1_client_init(_bstr_t("blah"), _bstr_t("east.gamesnet.net"), _bstr_t("#blah"));

but when the event triggers it dont send the strings to the dll Confused | :confused:

for some reason the strings get lost! Cry | :((

what does "Add an UPDATE_COMMAND_UI handler for ..." mean?

DanYELL21-Jan-02 8:19

DanYELL

21-Jan-02 8:19

There is an article here:

http://support.microsoft.com/default.aspx?scid=kb;EN-US;q145616

which explains how to activate the cut, copy, paste commands of Edit. The second step says:

Add an UPDATE_COMMAND_UI handler for ID_EDIT_COPY & ID_EDIT_CUT:

What exactly does that mean? If I add a public member function

public:
void OnUpdateNeedSel(CCmdUI* pCmdUI);

The program seems to work okay. I just don't understand what UPDATE_COMMAND_UI means. Do I need to add something to BEGIN_MESSAGE_MAP????

Please, please, any response any one can give me will be greatly appreciated.

Sincerely,
Danielle (an overworked graduate student)

Re: what does "Add an UPDATE_COMMAND_UI handler for ..." mean?

Joaquín M López Muñoz21-Jan-02 8:30

Joaquín M López Muñoz

21-Jan-02 8:30

Those UPDATE_COMMAND_UI handlers are called by the framework to determine whether the handled command (ID_EDIT_COPY, etc.) should be enabled or disabled on your menu. If you don't provide those, my guess is that the commands "Copy" and "Cut" will remain enabled all the time, even when there's nothing to copy (nor cut).

Do I need to add something to BEGIN_MESSAGE_MAP????
Yes you do. Check the online help about ON_UPDATE_COMMAND_UI for more info on how to add such handlers.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

.HLP made me CRAZY !

Hadi Rezaee21-Jan-02 8:14

Hadi Rezaee

21-Jan-02 8:14

Hi all,
I maked a MFC project without Help Support !
So, i made .HLP and .CNT ( a help with index list ! not bad Wink | ;)

)
i made .HM file, too.
i added .HPJ and .CNT and .RTF and etc to my project, too.
But when i hit F1 button, program show me this error message:
"The topic does not exist. Contact your application vendor for an updated Help file(129)."
Ahhhh, GOD !
Help me Frown | :(

My month article: Game programming by DirectX by Lan Mader.
Please visit in: www.geocities.com/hadi_rezaie/index.html

Hadi Rezaie

Change icon in SDI

21-Jan-02 7:28

How and where do I cahnge an icon in an SDI app? And am I limited it 16 bit colors?

Derek Smigelski
Dereks@mip.com

Re: Change icon in SDI

Joaquín M López Muñoz21-Jan-02 7:46

Joaquín M López Muñoz

21-Jan-02 7:46

Mike Dunn's C++ FAQ teaches you how to do it.
As for the number of colors, I think you are not limited to 16 (just try to know).

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

OpenGL

Rajveer21-Jan-02 7:11

Rajveer

21-Jan-02 7:11

I'm designing a 3D graphics software, using OpenGL on a visual C++ compiler for all the graphics stuff. But as far as the non graphics stuff goes, I'm probably just going to use MFC. How do I use them together. For example, I just created a window and did all the animation stuff using OpenGL. How do I know use MFC to put little menus and buttons on the screen to do stuff. Or should I just use OpenGL for all that stuff?

SDI view that doesn't occupy the entire main frame?

jonbrown21-Jan-02 7:10

jonbrown

21-Jan-02 7:10

I've got a little app I'm writing, and I went dialog based because I like the "toolbox" and "view window" (the view isn't an MFC view, just a control that behaves like one). Basically I want to have a view take up two thirds of the mainframe and one third with buttons etc stuck on it. Any suggestions? Smile | :)

jon brown

blocking mouse and keyboard hardware

Kuniva21-Jan-02 6:47

Kuniva

21-Jan-02 6:47

Hey'all, i need something that'll block the keyboard and mouse so the user cant do anything anymore (or f*** things up like Bill would say it :p) but so you can still use SendInput and control the mouse and keyboard input programatically. Does anyone know a way to do this?

Thanks in advance.

Kuniva
--------------------------------------------
God gave man a penis and a brain but not enough blood to make both of 'em work at the same time.

Re: blocking mouse and keyboard hardware

Jon Hulatt21-Jan-02 6:55

Jon Hulatt

21-Jan-02 6:55

Put a hook on keyboard and mouse messages, and throw them away.

See articles on this site about System Hooks.

Sorry to dissapoint you all with my lack of a witty or poignant signature.

Could ya'll please tell me what is wrong with this code?

Ever123421-Jan-02 6:16

Ever1234

21-Jan-02 6:16

Okay, it isnt done yet and this is the first time I have ever used arrays. Visual Studio 6.0 gave me 21 errors, and I dont know how to fix it.

heres the code:

// Password Generator.cpp : Randomly generates an 8 charactor password.
//with swapping vowls and consenents for maximum pronounciblity.

#include "stdafx.h"

int APIENTRY WinMain(HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPSTR lpCmdLine,
int nCmdShow)
{
// TODO: Place code here.

char cons[19];
char vowl[6];
int number[10];

cons[0]="b" || "B";
cons[1]="c" || "C";
cons[2]="d" || "D";
cons[3]="f" || "F";
cons[4]="g" || "G";
cons[5]="h" || "H";
cons[6]="j" || "J";
cons[7]="k" || "K";
cons[8]="l" || "L";
cons[9]="m" || "M";
cons[10]="n" || "N";
cons[11]="p" || "P";
cons[12]="r" || "R";
cons[13]="s" || "S";
cons[14]="t" || "T";
cons[15]="v" || "V";
cons[16]="w" || "W";
cons[17]="x" || "X";
cons[18]="z" || "Z";

vowl[0]="a" || "A";
vowl[1]="e" || "E";
vowl[2]="i" || "I";
vowl[3]="o" || "O";
vowl[4]="u" || "U";
vowl[5]="y" || "Y";

int number[0]="1";
int number[1]="2";
int number[2]="3";
int number[3]="4";
int number[4]="5";
int number[5]="6";
int number[6]="7";
int number[7]="8";
int number[8]="9";
int number[9]="0";

return 0;
}

"To wonder is to begin to understand"

Re: Could ya'll please tell me what is wrong with this code?

Rick York21-Jan-02 6:23

Rick York

21-Jan-02 6:23

First, cons is declared as an array of 19 characters. You are attempting set each item to a string logically or-ed with another string. The or-ed strings will result logically in a just a one. You probably want to set them to single character value so use the single quotes around each one. This applies to vowl also.

Second, number is already declared as an array of 10 integers. You have an int in front of each use of them. Also, you probably don't want to set each entry in the int array to a string. To set each one to an integer value you need to lose the double quotes.

Re: Could ya'll please tell me what is wrong with this code?

Ravi Bhavnani21-Jan-02 6:33

Ravi Bhavnani

21-Jan-02 6:33

If you're new to arrays, I assume you're relatively new to programming. In which case, you should be creating console apps, not Win apps. Replace the WinMain() function with a standard C-style main(). Also, you should use the "Console application" in App Wizard.

/ravi

"There is always one more bug..."
ravib@ravib.com
http://www.ravib.com

Re: Could ya'll please tell me what is wrong with this code?

Ever123422-Jan-02 13:37

Ever1234

22-Jan-02 13:37

okay, what does this mean?

error C2440: '=' : cannot convert from 'char [2]' to 'char'

I got 25 of these for that code.

"To wonder is to begin to understand"

Re: Could ya'll please tell me what is wrong with this code?

Tim Smith22-Jan-02 14:38

Tim Smith

22-Jan-02 14:38

"b" is a character string of length 2. If you want just the character 'b', then use single quotes.

Tim Smith
Descartes Systems Sciences, Inc.

Piping stdout to text box

Leo Smith21-Jan-02 6:08

Leo Smith

21-Jan-02 6:08

I have what may be a simple question. I have a couple of DOS apps that I would like to have a Windows Front-End for. I know how to launch the apps from the windows app, but I want the output to be piped directly into text box (or something like that), instead of sending it to a text file then reading the text file one line at a time. Is there a simple way to capute or redirect the screen output to a window?

Thanks,

Leo T. Smith
Senior Programmer/Analyst
Hartwick College

Re: Piping stdout to text box

Not Active21-Jan-02 6:24

Not Active

21-Jan-02 6:24

This bit sends cout to a console

<br />
	if( !AllocConsole() )<br />
		MessageBox(_T("AllocConsole failed."));<br />
	<br />
	m_hConsole = GetStdHandle(STD_OUTPUT_HANDLE);<br />
	freopen("CONOUT$", "wt", stdout);<br />
	cout = new stdiobuf(stdout);<br />

Re: Piping stdout to text box

Ravi Bhavnani21-Jan-02 6:37

Ravi Bhavnani

21-Jan-02 6:37

See QuickWin - Turn a console application into a Windows program.

/ravi

"There is always one more bug..."
ravib@ravib.com
http://www.ravib.com

Deleting protected registry keys

21-Jan-02 5:32

I need to delete the following recursively programatically. Any ideas??

[HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\Enum\Root\LEGACY_NETBIOS\

Thanks,
Derek Smigelski
DerekS@mip.com

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