C / C++ / MFC Discussion Boards

LCI10-Jan-06 9:46

10-Jan-06 9:46

Dunno why i am drawing a blank here but here goes...

I have a pointer called buff
Tuff* buf;

Would like to send this data to function, but that function accepts a
NotTuff*

Please help refresh my memory.

Re: MFC Pointers

Nish Nishant10-Jan-06 9:48

Nish Nishant

10-Jan-06 9:48

LCI wrote:
Dunno why i am drawing a blank here but here goes...

I have a pointer called buff
Tuff* buf;

Would like to send this data to function, but that function accepts a
NotTuff*

How are Tuff and NotTuff polymorphically related?

Regards,
Nish

My blog : Nish’s thoughts on MFC, C++/CLI and .NET

Re: MFC Pointers

LCI10-Jan-06 9:58

LCI

10-Jan-06 9:58

I am using the Gdiplus library to display pics on a screen.
One of the calls that i have to make needs an IStream*.
However, i get the sream data from the camera as a cdvoid*. I need to pass the data from the camera to the Gdiplus but passing a cdvoid* to a function that takes an IStream* will not work so i somehow have to cast.

Any thoughts.

Re: MFC Pointers

Nish Nishant10-Jan-06 10:08

Nish Nishant

10-Jan-06 10:08

If you are sure that the csvoid* is a pointer to an IStream, go ahead and cast it - you could use dynamic_cast here - though depending on what a csvoid* is, you may have to resort to reinterpret_cast.

Regards,
Nish

My blog : Nish’s thoughts on MFC, C++/CLI and .NET

Re: MFC Pointers

Christian Graus10-Jan-06 10:45

Christian Graus

10-Jan-06 10:45

Casting is not going to magically change this object. It's more likely that you need to access the bits of the bitmap and fill them out by traversing the structure you're getting back.

Christian Graus - Microsoft MVP - C++

Re: MFC Pointers

David Crow10-Jan-06 10:01

David Crow

10-Jan-06 10:01

Assuming that the function can handle the conversion:

function( NotTuff *nt )
{
}
...
Tuff *buf;
function((NotTuff *) buf);

There's also dynamic_cast if you need it.

"The words of God are not like the oak leaf which dies and falls to the earth, but like the pine tree which stays green forever." - Native American Proverb

List control size.

Maximilien10-Jan-06 9:10

Maximilien

10-Jan-06 9:10

I have a CListBox, not ownerdrawn, and I want its size to be 3 items high, programatically if possible.

Is it possible to the the size of the control to a number of visible elements ?

well, an easier way than calculating that myself, by computing the item height + some padding for the borders.

for example :

/// Can I do that even if the list is not filled ? seems to work.
int iHeight = m_Listbox.GetItemHeight(0);

int iBoxHeight;
CRect rect;
m_Listbox.GetWindowRect(rect );
iBoxHeight = rect.Height();
CRect rect2;
m_Listbox.GetClientRect( rect2 );
int iClientRectHeight = rect2.Height();

/// Is there a better way to get the width of the borders of the CListBox ?
int iTotalBorderHeight = iBoxHeight - iClientRectHeight;

/// Size will be enough to have 3 visible items.
int iSize = 3 * iHeight + iTotalBorderHeight ;

rect.bottom = rect.top + iSize;
m_Listbox.MoveWindow( rect );

Thanks.

Maximilien Lincourt
Your Head A Splode - Strong Bad

Re: List control size.

Ryan Binns10-Jan-06 15:00

Ryan Binns

10-Jan-06 15:00

There isn't some magical SetVisibleItemCount() method or something like that, you'll have to calculate the size as you suggested.

You're on the right track with that algorithm, although that MoveWindow won't work as you expect. It expects coordinates relative to the parent window, and you're giving it coordinates relative to the screen. I'd recommend using SetWindowPos() with the SWP_NOMOVE flags so you only change the size of the window. Other than that it looks good.

And yes, GetItemHeight() will work for an empty list as long as it's not set to LBS_OWNERDRAWVARIABLE style.

Hope this helps,

Ryan

"Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late" John Nichol "Point Of Impact"

Re: List control size.

PJ Arends10-Jan-06 15:26

PJ Arends

10-Jan-06 15:26

Have a look at AdjustWindowRect.

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Within you lies the power for good - Use it!

Changing read to read/write

Martin Marvinski10-Jan-06 7:00

Martin Marvinski

10-Jan-06 7:00

Quick question. I have a C++ application that copies a file off of a CD-ROM to the disk. When it gets to the disk, the file is read only. I haven't programmed in Win32 in a while and I've forgotten which function allows me to change a file from read to read/write. The file system is NTFS.

Thanks in advance.

Re: Changing read to read/write

Curtis Schlak.10-Jan-06 7:16

Curtis Schlak.

10-Jan-06 7:16

SetFileAttributes[^]?

"we must lose precision to make significant statements about complex systems."
-deKorvin on uncertainty

Re: Changing read to read/write

Nish Nishant10-Jan-06 7:39

Nish Nishant

10-Jan-06 7:39

Holy cow, I didn't know you still hung around here, Martin Smile | :)

Regards,
Nish

My blog : Nish’s thoughts on MFC, C++/CLI and .NET

Re: Changing read to read/write

Martin Marvinski10-Jan-06 8:01

Martin Marvinski

10-Jan-06 8:01

Hi Nish,

Good to see you! I have been here a few times to look somethings up, but I haven't programmed in win32 for a few years. I've mostly been doing UNIX programming the last couple of years. I hope you are doing really well, Nish, you have a great attitude and are extremely talented.

Sincerely,
Martin.

Smile | :)

Ask help for Microsoft CryptoAPI

hanofee10-Jan-06 6:24

hanofee

10-Jan-06 6:24

I got a project made to address Microsoft CryptoAPI but can't compile it. Seems, it can't recognize any declaration in wincrypt.h (I've verified that the wincrypt.h and Crypt32 library is in the right place).

I'll try to find on the code project, that suggest to define this:
#define _WIN32_WINNT 0x0400
or this:
#define _WIN32_WINNT 0x0500
#define _CRYPT32_
but neither is working

Google search said that we might have to install newer platform SDK. Does anyone has a clue of using it ? If it's really because of SDK, where to get it (I never used SDK before) ?

Re: Ask help for Microsoft CryptoAPI

Gavin Taylor10-Jan-06 7:24

Gavin Taylor

10-Jan-06 7:24

Not sure about the problem with the Crypto API not compiling, what errors are you getting back from the compiler?

You can download[^] the lastest Platform SDK straight from the MSDN site, just hope you're not on dialup as it's just under 400mb's Smile | :)

Gavin Taylor
w: http://www.gavspace.com

Re: Ask help for Microsoft CryptoAPI

hanofee10-Jan-06 21:53

hanofee

10-Jan-06 21:53

Here are a parts my error (the first line, I'm using something from wincrypt - see at the end):
:\test crypto\certmanager\certificate manager v3.2.2\lcertcontext.h(24) : error C2146: syntax error : missing ';' before identifier 'CreateCardList'
d:\test crypto\certmanager\certificate manager v3.2.2\lcertcontext.h(24) : error C2501: 'PCCERT_CONTEXT' : missing storage-class or type specifiers
d:\test crypto\certmanager\certificate manager v3.2.2\lcertcontext.h(24) : error C2061: syntax error : identifier 'HCRYPTPROV'

I've tried to find in MSDN.com, but can't find it. Could you please give me more clue about how to find it (link, keywords, or whatever) ? I don't mind about the size Smile | :)

And here is a part of my code, including my define:

#define _WIN32_WINNT 0x0400
#include <stdio.h>
#include <windows.h>
#include <wincrypt.h>
#include "Resource.h"

#define MY_ENCODING_TYPE (PKCS_7_ASN_ENCODING | X509_ASN_ENCODING)

class lCertContext
{
public:
BOOL FillListCtrl(CListCtrl *List,int *ListIndex);
PCCERT_CONTEXT CreateCardList(HCRYPTPROV hCSPCard,DWORD dwFlag, LPTSTR szCSPname);
}

Re: Ask help for Microsoft CryptoAPI

hanofee10-Jan-06 21:55

hanofee

10-Jan-06 21:55

The missing 3 includes from my previous reply are (because of 'tag' like) - in the order:
stdio.h, windows.h, wincrypt.h

Re: Ask help for Microsoft CryptoAPI

Gavin Taylor10-Jan-06 22:53

Gavin Taylor

10-Jan-06 22:53

Weird, just tried building it from here and it works fine. Just check your defines are being made before you link to the include files, ie...

#define WINVER 0x0400
#define _WIN32_WINNT 0x0500

#include <windows.h>
#include <wincrypt.h>

Looking at the wincrypt header if dont use them anyways though.

You can download the Platform SDK from here[^], theres a section at the bottom that says 'Files in this download', just select the exe for your processor type, probobly x86.

Once you've downloaded the SDK (check you download all the samples as well as they can be quite helpful at times) try building one of the WinCrypt samples and see if that works.

Gavin Taylor
w: http://www.gavspace.com

Re: Ask help for Microsoft CryptoAPI

hanofee12-Jan-06 5:17

hanofee

12-Jan-06 5:17

The link you provided doesn't support VC++ 6 (seems Ms never care that millions people are still using the old good VS6). But anyway, I got it from a friend (after asking to many people Frown | :(

... and it's compiling perfectly. Thanks for your help anyway.

Re: Ask help for Microsoft CryptoAPI

Nish Nishant10-Jan-06 7:30

Nish Nishant

10-Jan-06 7:30

Where did you put those defines?

Regards,
Nish

My blog : Nish’s thoughts on MFC, C++/CLI and .NET

get Message from other windows than my application

desir10-Jan-06 5:28

desir

10-Jan-06 5:28

Hello ,

How can I get Message from other windows than my application ?
For example how can get in my application the Minimize/Maximize Window Message when I click on Min/Max of an Explorer Window,
wihtout using the Hook ?

Christian

Re: get Message from other windows than my application

Nish Nishant10-Jan-06 6:16

Nish Nishant

10-Jan-06 6:16

desir wrote:
wihtout using the Hook ?

You have to install a hook. Messages are always sent to their target windows (or threads). Imagine the havoc it'd cause, if every message was broadcasted to every window out there.

Regards,
Nish

My blog : Nish’s thoughts on MFC, C++/CLI and .NET

Help Windows XP Embedded

picazo10-Jan-06 4:55

picazo

10-Jan-06 4:55

Hello everyone,

I have written a configuration wizard in c++ (mfc) that works great on windows xp. I would like to use this application on a windows xp embedded system.

How would I go about creating the executable with no dependencies that will run on an xp embedded system? It is my first time working on an embedded application, so any help would be appreciated.

I have tried google, but I haven't had any luck finding a good tutorial.

Thanks in advanced.

-----------------
Genaro

Re: Help Windows XP Embedded

toxcct10-Jan-06 5:02

toxcct

10-Jan-06 5:02

is it working making MFC as static linkage to the project ??

TOXCCT >>> GEII power
[toxcct][VisualCalc 2.20][VisualCalc 3.0]

-- modified at 11:02 Tuesday 10th January, 2006

Re: Help Windows XP Embedded

picazo10-Jan-06 5:27

picazo

10-Jan-06 5:27

I think I might have stated my problem incorrectly. The problem is not the dependencies, the problem is that I want to be able to run the wizard on a windows xp embedded system, but it won't work if I just try to run the same executable that works in windows xp.

Are there settings that have to be changed in VS 2003 to make the exe work in xp embedded?

Thanks for the help,

-----------------
Genaro

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