Re: Accessing single Doc class from 2 different View classes? - C / C++ / MFC Discussion Boards

Robert Buldoc16-Sep-01 12:05

16-Sep-01 12:05

Hi fellow programmers!
Ok, here is the situation:
I am writting program consisted of 1 exe and about 5 dlls.
I have a structure(struct Options) which has all the programs variable in it. in My main file I defined
Options O;
then in other .cpp files I defined it
extern Options O;
this structure holds all variable, and works great in my exe program. However I want to export this instance (Options O) to my dll files so my dll files can use the variables inside this certain instance of the structure.
How can I do that? because in my DLL files when I import the extern Options O. It creates a new instance of Options and it doesn't use the variables which are already being used in the exe file;
I am totall puzzled! Confused | :confused:

some one please help me!!! I really appreciate it! please ask me if you need more information to answer my question!
Best regards to you all!
Damon

Re: Exporting & Importing to DLL file

Tomasz Sowinski17-Sep-01 0:12

Tomasz Sowinski

17-Sep-01 0:12

Basically, you should encapsulate the options:

1) In some DLL, create a function that returns the address or reference

Options& GetOptions()
{
static Options options;
return options;
}

2) export that function from the DLL
3) whenever you need the access to options, use GetOptions.

Tomasz Sowinski -- http://www.shooltz.com

Re: Exporting & Importing to DLL file

Oscar Vazquez17-Sep-01 9:06

Oscar Vazquez

17-Sep-01 9:06

Look at this page by Ryan Schneider.
A Simple Wrapper for Sharing Data Structures Between Processes
http://www.codeproject.com/useritems/csharedstruct.asp

Another approach could be an initialization function in every dll

// in your exe .cpp
Options O;

MyDllInit( O );

// in your dll .cpp
Options O_Dll;

void MyDllInit( Options &O )
{
memcpy( &O_Dll, &O, sizeof(Options);
}

maximize/restore buttons

pmrainer16-Sep-01 9:42

pmrainer

16-Sep-01 9:42

Hello!

I have a great problem.
I have done a view showing a bitmap.
The view always fits the size of the
bitmap. In the case, that the view
is smaller than the bitmap, scrollbars
are shown to scroll over the bitmap.
Now I want to implement the maximize
functionality that way, that pushing
the maximize button expands the view
to fit the bitmap only, but not to the
size of the mainframe window. How can
I implement this functionality. I already
catched the corresponding messages in
OnSysCommand and I can resize the view
to fit the bitmap, but I can not change
the maximize button to the restore button.

Is anyone out there who can help?

Many thanks in advance.

Peter
from Vienna

pmrainer

Re: maximize/restore buttons

Christian Graus16-Sep-01 12:18

Christian Graus

16-Sep-01 12:18

There are a number of ways to do this. You can turn OFF the maximise button in the view window, you could capture WM_SIZE and when the window gets a message to size bigger than the bitmap you could make it size to just the bitmap, or you could just allow the maximising and centre the bitmap.

Christian

As I learn the innermost secrets of the around me, they reward me in many ways to keep quiet.

Men with pierced ears are better prepared for marriage. They've experienced pain and bought Jewellery.

Re: maximize/restore buttons

Tomasz Sowinski17-Sep-01 0:23

Tomasz Sowinski

17-Sep-01 0:23

Handle WM_GETMINMAXINFO. Use AdjustWindowRect[Ex] in the handler to compute frame size based on bitmap size.

Tomasz Sowinski -- http://www.shooltz.com

Accessing single Doc class from 2 different View classes?

16-Sep-01 9:13

Is it possible to access eg. CTreeDoc from CTreeView and CArtView?

I use:

CTreeDoc* pDoc = GetDocument();
ASSERT_VALID(pDoc);

in the CArtView::OnDraw(), but it won't let me access the member functions of CTreeDoc. What do I need to add?

Marco

Re: Accessing single Doc class from 2 different View classes?

Tomasz Sowinski16-Sep-01 23:58

Tomasz Sowinski

16-Sep-01 23:58

Did you #included "yourdoc.h" in artview.cpp?

Tomasz Sowinski -- http://www.shooltz.com

Buffer

16-Sep-01 8:20

Hey does anyone know how to put a DWORD into a BYTE Buffer
without converting it or using the string functions. ie what would be the code behind the string functions that does it.

Cheers
Peter

Re: Buffer

Anders Molin16-Sep-01 9:02

Anders Molin

16-Sep-01 9:02

Why do you want to copy a DWORD into a BYTE buffer?

Anyway, how about something like this...

(I have just written it in the browser, so there might be syntax errors...)

DWORD dw = 65535;
byte b = (byte*)malloc(sizeof(DWORD));
memcpy(b, dw, sizeof(DWORD));

- Anders

Money talks, but all mine ever says is "Goodbye!"

Re: Buffer

Tim Smith16-Sep-01 9:08

Tim Smith

16-Sep-01 9:08

There is also

*((DWORD *) b) = dw;

But that has some minor drawbacks on many CPUs. If b is not aligned on a DWORD, you get an alignment fault. Luckally, that isn't a problem on intel processors.

Tim Smith
Descartes Systems Sciences, Inc.

Advance UI in VC++

16-Sep-01 7:11

I hope that you have seen the web browser called "NEO-PLANET". Its user interface is really interactive. I want to create such user interfaces using VC++. Please help me in this regard.

Imran Farooqui

Re: Advance UI in VC++

Michael P Butler17-Sep-01 2:16

Michael P Butler

17-Sep-01 2:16

Are you talking about how the browser can have different "skins" or something else?

Do a search for skin on CodeProject and you'll find some interesting articles such as http://www.codeproject.com/dialog/ezskin.asp"

Michael Smile | :)

how to deal with the LNK2001 error?

Jeason Zhao16-Sep-01 5:47

Jeason Zhao

16-Sep-01 5:47

there are one const memeber constM and one const function constFunction
#classA head file
class classA
{
const int constM ;
const int constFunction ();
}
class classA::constM;

#end of classA head file

#classA cpp file
int constFunction (){return 0;};
#end of classA cpp file

#fileB head file
#include "classA.h"
void main()
{

};
class fileB::cons

compile error:
two obj file LNK2001

Help!!Help!!Help!!

Confused | :confused:

Please pardon my weak English!

Re: how to deal with the LNK2001 error?

Tim Smith16-Sep-01 7:51

Tim Smith

16-Sep-01 7:51

Place you "class classA::constM" in the classA.cpp file. Having it in the H file causes it to be defined in every .CPP file that includes classA.h.

Tim Smith
Descartes Systems Sciences, Inc.

Re: how to deal with the LNK2001 error?

Jeason Zhao16-Sep-01 15:59

Jeason Zhao

16-Sep-01 15:59

Thanks!!!

Please pardon my weak English!

Long File Name

The_Server16-Sep-01 4:34

The_Server

16-Sep-01 4:34

Hi, all.
========
Under win98 file name longer than 8.3 appear with "~1" in DOS.
example:
--------
Win98, the file looks like this:
filename longer than 8 chars.dat
DOS, the file looks like this:
filena~1.dat

Does anyone know where the filename is stored, and how does it work?

thanks!!

BTW: come to #CodeProject on DalNet (mIRC)

Re: Long File Name

Tomasz Sowinski17-Sep-01 1:00

Tomasz Sowinski

17-Sep-01 1:00

The long file name occupies multiple, linked entries in FAT directory. These entries are marked with attribute combination which was never used in any version of DOS. When you save file with a long fn to floppy and read this on a machine running DOS (do you still have one?), these directory entries are ignored by operating system.

Tomasz Sowinski -- http://www.shooltz.com

Re: Long File Name

The_Server18-Sep-01 7:57

The_Server

18-Sep-01 7:57

so...
if I understood right:
long file names and short file names saved on the HD the same way but the Operating System reads it differently

BTW: come to #CodeProject on DalNet (mIRC)

Checking for IP address / like Pinging HELP!!!!

16-Sep-01 4:20

i am working in tcp/IP communication.
i am using some Third Party API's for connecting through TCP/IP.
the API taking Lot of time to check the connectivity.
is there any API in MSDN which can ensur connectivity for specified IP address. Kindly Reply ASAP.
Looking forward for early reasponse

Suleman

Re: Checking for IP address / like Pinging HELP!!!!

Anders Molin16-Sep-01 9:08

Anders Molin

16-Sep-01 9:08

Is it always taking a long time, or is it just when the program cannot connect to the server that it takes a long time?

If it only is when it cannot connect there is really not much to do about it.
If the program try to connect to a server that does not exist, it sends, (windows socket standard), a SYN packet to the ip-address, and wait for some time for an answer (a SYNACK packet), if it don't get the answer it tries 2 more times.
It takes some time, about 30 seconds, I would say...

- Anders

Money talks, but all mine ever says is "Goodbye!"

using VK_UP

16-Sep-01 2:08

Can someone give me a little example of code how to use the VK_UP key in MFC.
I want that if I press the "up" key a messagebox should appear...

Re: using VK_UP

Christian Graus16-Sep-01 2:12

Christian Graus

16-Sep-01 2:12

You want to capture WM_KEYDOWN, WM_KEYUP or WM_CHAR, then it's a case of doing a switch on the nChar variable passed in:

switch (nChar)
{
   case VK_UP:
        AfxMEssageBox("You pressed up");
        break;

I generally go for WM_KEYDOWN.

Christian

As I learn the innermost secrets of the around me, they reward me in many ways to keep quiet.

Men with pierced ears are better prepared for marriage. They've experienced pain and bought Jewellery.

Re: using VK_UP

16-Sep-01 2:19

But Why it doesn't work with VK_RIGHT and VK_DOWN?

Re: using VK_UP

Tim Smith16-Sep-01 2:33

Tim Smith

16-Sep-01 2:33

Are you subclassing a dialog control?

If so, you will need to handle the WM_GETDLGCODE message to inform the dialog that you want the arrow keys.

Tim Smith
Descartes Systems Sciences, Inc.

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.