C / C++ / MFC Discussion Boards

Re: Template bug in VC++ 6

John M. Drescher8-Apr-03 8:07

John M. Drescher

8-Apr-03 8:07

A quick fix on this is to pass data as a parameter to the function instead of a template parameter.
John

Re: Template bug in VC++ 6

Joaquín M López Muñoz8-Apr-03 9:34

Joaquín M López Muñoz

8-Apr-03 9:34

This is a well-known VC++ bug. The compiler is unable to deduce the template parameters unless they're present in some form in the arguments for the function. Try the following workaround (I don't have my VS handy, but I'm reasonably sure it works):

#include "stdafx.h"
#include <stdio.h>
 
template<class DATAType,DATAType data>Test(DATAType* dummy=0)
{
printf("Sizeof DATAType %d\n",sizeof(data));
printf("Data = %d\n",data);
}

int main(int argc, char* argv[])
{
Test<char,0>();
Test<int,1>();
return 0;
}

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Embedded images in CDHtmlDialog

joblemar8-Apr-03 7:26

joblemar

8-Apr-03 7:26

How can i display an image stored in the resources in the application in an HTML File which is displayed in a CDHtmldialog ???

I would like also not to have to specify the name of the application, if this is possible.

Thanks. Poke tongue | ;-P

Re: Embedded images in CDHtmlDialog

Big Art8-Apr-03 14:39

Big Art

8-Apr-03 14:39

In your res file you need a folder resource named "GIFS".
Then add your image to the project in that folder and name it with quotes:
"MyImage.gif"

Then in the html page refer to it like you normally would in any html file:

background="GIFS/MyImage.gif" (as an example for using it as a background)

Art

CFile to CStringArray : Serialize error

Willem Hofmans8-Apr-03 6:31

Willem Hofmans

8-Apr-03 6:31

Hi,

I get the following runtime error:An attempt was made to access an unnamed file past its end.

With this code where i try to open a textfile and put them in a stringarray.

<br />
CFile cfFile;<br />
	<br />
cfFile.Open(dlg.GetPathName(), CFile::modeRead);<br />
<br />
CArchive ar (&cfFile, CArchive::load); // Load its contents into a CArchive<br />
<br />
CStringArray test;<br />
test.Serialize(ar);

Thanks for helping!

Willem

Re: CFile to CStringArray : Serialize error

Ravi Bhavnani8-Apr-03 6:38

Ravi Bhavnani

8-Apr-03 6:38

You may want to first serialize the size of the CStringArray, followed by each CString element. See "Serializing a homogenous collection class" in this[^] article

/ravi

Let's put "civil" back in "civilization"
http://www.ravib.com
ravib@ravib.com

win32 unresolved function at compile time

Reza Shademani8-Apr-03 5:56

Reza Shademani

8-Apr-03 5:56

hi guys ,

i build a DLL file using .DEF function specifier ,now when i want to use the DLL in other application compiler throw me LNK2019 like errors .

does anybody give me a pattern in using DLL within win32 application .

thank u in advance.

ModifyStyle ChildWindow

jeremysay8-Apr-03 5:30

jeremysay

8-Apr-03 5:30

hello,
i have another problem with child window, when i want to allow resizing i display border and when i want to prevent resizing i hide border.

now i do this to show Sizable Border:

pChild->ModifyStyle(0 ,WS_SIZEBOX ,SWP_NOSIZE | SWP_NOMOVE |SWP_SHOWWINDOW  );

pChild->SetWindowPos(NULL, 0, 0, 0,0,
				SWP_FRAMECHANGED |
				SWP_NOMOVE | SWP_NOSIZE |
				SWP_NOZORDER);

before do this i have scrolled my view with :

ScrollWindow(-posHorz,-PosVer);

my problem is when i want to show the border the view do a "ScrollTo (0,0)" ! i put "SWP_NOMOVE " in the SetWindowPos my child window don't move and why my view repositioned to (0,0) ??
i have try to remove SWP_FRAMECHANGED in the SetWindowPos and my view don't move but sizable borders aren't show!
If you know how to add sizable border and remove them easily ...

Excuse me for very bad english

Is there a way to catch any exception from STL?

vmaltsev8-Apr-03 5:12

vmaltsev

8-Apr-03 5:12

Hail everyone,

I wonder, what gonna happen with STL container, let's say vector, if there is no memory for add new element? Method push_back returns nothing. In source code of vector I was able to find only 2 exceptions, _Xlen (length_error) and _Xran (out_of_range), but nothing else.
I'm not very familiar with STL, so any help is appreciated.

Thanks in advance.

Re: Is there a way to catch any exception from STL?

valikac8-Apr-03 6:38

valikac

8-Apr-03 6:38

Here are two excellent STL references.

http://www.sgi.com/tech/stl/
http://www.josuttis.com/libbook/idx.html

try()
catch(...) // Catch any exceptions.

Kuphryn

CREATESTRUCT

Gabor Kalman8-Apr-03 4:49

Gabor Kalman

8-Apr-03 4:49

in: BOOL CMainFrame::PreCreateWindow(CREATESTRUCT& cs)

Is there a limitation to size the MainFrame?

The following code-snippet works up to: int sz=7, but not with sz=8. Why?

int ySize=::GetSystemMetrics(SM_CYFULLSCREEN);
int xSize=::GetSystemMetrics(SM_CXFULLSCREEN);
cs.cy = ySize*sz/10;
cs.cx = xSize*sz/10;
cs.x=(xSize-cs.cx)/2;
cs.y=(ySize-cs.cy)/2;
return CFrameWnd::PreCreateWindow(cs);

Gabor Kalman

Re: CREATESTRUCT

Bartosz Bien8-Apr-03 13:20

Bartosz Bien

8-Apr-03 13:20

I've just tested it and it works with sz == 10 as well.
You may send me a sample project if you wish (mail@BartoszBien.com).

Regards,
BB

Re: CREATESTRUCT

Bartosz Bien9-Apr-03 5:37

Bartosz Bien

9-Apr-03 5:37

If it is a problem related to CFormView (which is inherited from CScrollView), check if CScrollView::ResizeParentToFit is not called where it should not be. Hasn't tested it, but this may be the case.

Regards,
BB

Accessing VRAM from user application

Sandeep Shetty8-Apr-03 4:25

Sandeep Shetty

8-Apr-03 4:25

Hello,
I have some queries

1. Is it possible to directly access Video RAM from User Application?
2. If not, How to read/write data directly to Video RAM ?

When searched, I found that certain IOCTLs ( like IOCTL_VIDEO_MAP_VIDEO_MEMORY ) available for Video RAM access. But It seems that these IOCTL are being used by the video driver. Can we have access to these IOCTLs and How?
Can you provide some clue as to how we can go ahead.

Regards

Sandeep

Re: Accessing VRAM from user application

Daniel Strigl8-Apr-03 10:24

Daniel Strigl

8-Apr-03 10:24

You can use DirectDraw to get access to the video memory! Just create a primary DirectDraw surface!

Daniel Wink | ;)

---------------------------
Never change a running system!

Re: Accessing VRAM from user application

Sandeep Shetty8-Apr-03 21:12

Sandeep Shetty

8-Apr-03 21:12

Hello!!

Thank you for your reply.
I have one more question.
Does DirectDraw allow the application to get the whole of the VRAM or just a part of it? Can the full VRAM be tested by writing data to it and then reading it back?

Sandeep

Re: Accessing VRAM from user application

Daniel Strigl9-Apr-03 7:22

Daniel Strigl

9-Apr-03 7:22

I think yes, but I don't know exactly!
You can access the whole video memory, that you will see on your monitor screen!
But most graphic-cards have more momory and you can allocate some memory directly in the graphic-card memory!

Daniel Wink | ;)

---------------------------
Never change a running system!

Re: Accessing VRAM from user application

Sandeep Shetty18-Apr-03 2:02

Sandeep Shetty

18-Apr-03 2:02

Thank you for your answer.

I am now able to get the total video memory which is free and total video memory in the system by using function IDirectDraw::GetCaps().
I am now able to get the pointer of the surface by using DDSURFACEDESC2 structure and IDirectDrawSurface::Lock(). I have locked the surface using the function IDirectDrawSurface::Lock(), and then went on to write data in the surface till total memory. i.e. I am filling the total video memory with my data. The data is also seen on the screen. But after the screen is completely filled, the screen can be refreshed again by pressing alt+tab and again ALT+TAB (or if the screen is refreshed by some other event). My question is if I have locked the surface how does the screen get refreshed?

I have written the data in blocks of 4 KB.
I am reading the data back and then comparing it. If I increase the size of data to be written from 4K to 5K then my compare fails. Even if I increase the data size to 8k (to see if it has to do something with page size) then too, the compare fails..
Can anyone tell me why 4096 so special?

I also need advise on feasibility of following:
While writing data on whole of VRAM can I show the data written on anypart of VRAM on the screen in a window?

Can anyone help me out?

Regards,
Sandeep

[MFC] Use a bitmap resource ?

Lowfyr8-Apr-03 4:10

Lowfyr

8-Apr-03 4:10

Hello,

I have a MDI project with Doc/View and i'm able to creaye objects like circles and drag&drop them.

But i would like to use bitmaps resources instead of these objects and continue to move them.

If someone has an idea Confused | :confused:

Thanks.

Bitmap in RichEditCtrl

evgeny_sh8-Apr-03 4:02

evgeny_sh

8-Apr-03 4:02

Help me please. How can I insert a bitmap from clipboard into RichEdit Control? I use MFC. Thanks!

Re: Bitmap in RichEditCtrl

Chulips26-Feb-04 9:37

Chulips

26-Feb-04 9:37

Take a look at CodeGuru - http://www.codeguru.com/Cpp/controls/richedit/article.php/c5383/

__________
Chulips

problem in Hello World example

n7yahoo8-Apr-03 3:25

n7yahoo

8-Apr-03 3:25

AppWizard created this Hello World example (as Win32 Application).
I didn't change anything.
The example works fine, but in the following situation
there is a problem ???
Start the example and do following:
1. press: Alt+Space
2. select: Move (the Move label in the system menu)
3. press: Enter (or Esc)
After that Windows displays error message:
"This program has performed an illegal operation
and will be shut down."

Thanks in advance for any help.

Re: problem in Hello World example

Maximilien8-Apr-03 3:42

Maximilien

8-Apr-03 3:42

Well, it works well here (as always)...

Are you sure you didn't change anything ? Can yo start the application in debug mode and tell us more where it crashes by looking at the call stack ?

Thanks.

Max.

Maximilien Lincourt
For success one must aquire one's self

Re: problem in Hello World example

n7yahoo8-Apr-03 20:52

n7yahoo

8-Apr-03 20:52

Well, I do start the aplication in debug mode.
(in VC 6.0 I press F5)
But I get error message from Windows:
"This program has performed an illegal operation
and will be shut down."

If I go to the VC (using break execution)
the current statement is:
default:
return DefWindowProc(hWnd, message, wParam, lParam);
and the call stack is:
WndProc(HWND__ * 0x00000c84, unsigned int 274, unsigned int 61456, long 0) line 169 + 24 bytes
KERNEL32! bff7363b()
KERNEL32! bff94407()

Anyway, "Hello World" example is too simple.
There is almost no code in it.
And it is the code generated from AppWizard.
And after
1. press: F5
2. press: Alt+Space
3. select: Move (the Move label in the system menu)
Windows displays 4arrow cursor for move window
and I quess control is in some system code not in the app?

Now (while 4arrow cursor is on the screen) I press Enter (or Esc) and get error message
from Windows:
4. press: Enter (or Esc)
After that Windows displays error message:
"This program has performed an illegal operation
and will be shut down."

Any ideas ?

Thanks.

easy question about CFile

Martin_Viet8-Apr-03 2:58

Martin_Viet

8-Apr-03 2:58

hi

I´m trying to read from a txt file a line:

	<br />
        <br />
        CFile arch;<br />
        CString linea="";<br />
<br />
	arch.Open("c:\\archivo.txt", CFile::modeRead );<br />
	<br />
	arch.Read(&linea, 1024);<br />
<br />
	arch.Close;<br />
<br />

But, It doesn´t work

Who can explain me how i have to do?

el hombre es libre cada vez que elige y eso es lo que lo hace libre

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