help - C / C++ / MFC Discussion Boards

Re: Regarding integration of two different projects

Maxwell Chen29-Jan-08 21:52

29-Jan-08 21:52

I just created two project:
1. C:\Tmp\Test1, in C,
2. C:\Tmp\Test2, in C++.

Test2 uses Test1 functions.

Steps:
1. Compile Test1 without worrying about Test2 at all.
2. Write this way in "Test2.cpp" :

#include "test2.h"
extern "C" {
  #include "../test1/test1.h"
}

3. Remember to add (to import, not file copy) "C:\Tmp\Test1\test1.c" and "C:\Tmp\Test1\test1.h" into your "test2" project.

And everything compiles happily!

Maxwell Chen

Re: Regarding integration of two different projects

manish.patel30-Jan-08 0:15

manish.patel

30-Jan-08 0:15

Thanks

Its working fine.!!!!

Manish Patel.
B.E. - Information Technology.

Re: Regarding integration of two different projects

Maxwell Chen30-Jan-08 1:09

Maxwell Chen

30-Jan-08 1:09

Maxwell Chen

the confusing term page file

George_George29-Jan-08 17:04

George_George

29-Jan-08 17:04

Hello everyone,

On Windows Server 2003, task manager there is a term called PF (Page File) and it has a related curve. Task manager also has another term called commit charge.

1. I think PF is the same as commit charge. Previously, I think Page File only includes the paged-out pages which physical memory can not contain, and the pages are not in memory are counted as PF. Now I think I am wrong and PF includes all committed pages, including the ones in memory and the ones on disk;

2. Even if the pages are marked as COMMIT, it is not always counted as a part of PF in some situations before it is actually used (request for zero and copy-on-write scenarios);

Are my understandings of (1) and (2) correct?

thanks in advance,
George

std::exception and STL

George_George29-Jan-08 16:42

George_George

29-Jan-08 16:42

Hello everyone,

It is correct to assume that all exceptions from STL are either std::exception itself or derived class from std::exception?

thanks in advance,
George

Re: std::exception and STL

Stephen Hewitt29-Jan-08 18:30

Stephen Hewitt

29-Jan-08 18:30

Yes

Steve

Re: std::exception and STL

George_George29-Jan-08 18:42

George_George

29-Jan-08 18:42

Thanks Stephen,

My question is answered.

regards,
George

help

gentleguy29-Jan-08 14:20

gentleguy

29-Jan-08 14:20

dear all

how to solve this problem: i initialize xx[10][3][4] = (double)rand()/RAND_MAX; in main function,
and define this function, when i call this function, why it has problem?

void Centroids::createPosition(double x[10][3][4])
{

cout <<endl<<The following is positions of 10 particles ! "<<endl<<endl;

for (int i = 0; i < 10; i++)
{
cout <<endl<<" "<<"Position of particle :"<<endl;

for (int j = 0; j< 3; j++)
{
for (int k = 0; k < 4; k++)

cout<< " "<<x[i][j][0]<<" "<<x[i][j][1]<<" "<<x[i][j][2]<<" "<<x[i][j][3]<<endl;

}
}
}
coulndn't display correctly..thanks

Li Zhiyuan

5/10/2006

Re: help

Maxwell Chen29-Jan-08 16:22

Maxwell Chen

29-Jan-08 16:22

li zhiyuan wrote:
for (int k = 0; k < 4; k++)
cout<< " "<<x[i][j][0]<<" "<<x[i][j][1]<<" "<<x[i][j][2]<<" "<<x[i][j][3]<<endl;

You are using k to iterate, but there is no k in the [].

Maxwell Chen

Multiple Application Serialization

perrin486929-Jan-08 13:42

perrin4869

29-Jan-08 13:42

Hi, I'm currently learning MFC, and I have a question about serialization.
If I have an application, and I use it to serialize a file, can I use a second application to open the same file (of course, both applications having the same attributes in their documents)? Every time I try to call the Serialize method of a CTypedPtrList with the corresponding CArchive I get an "Unexpected File Format" error. Both applications are using the same DLLs, which contain the polymorphic classes being used in the list. I am using Visual Studio 2008.

Thanks.

Re: Multiple Application Serialization [modified]

CPallini29-Jan-08 21:44

CPallini

29-Jan-08 21:44

Perrin01 wrote:
If I have an application, and I use it to serialize a file, can I use a second application to open the same file (of course, both applications having the same attributes in their documents)?

AFAIK, yes
[added]
I made a little test: it confims you can do it.
[/added]

Perrin01 wrote:
Every time I try to call the Serialize method of a CTypedPtrList with the corresponding CArchive I get an "Unexpected File Format" error. Both applications are using the same DLLs, which contain the polymorphic classes being used in the list. I am using Visual Studio 2008.

I think you have to proceed with little steps, for instance.
(1) Make sure that both applications use the same version number inside IMPLEMENT_SERIAL macro.
(2) Make sure the application that created file is able itself to load it.
(3) Try to store and load very simple files first.
(4) ...

Smile | :)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

[my articles]

modified on Wednesday, January 30, 2008 4:24:19 AM

Re: Multiple Application Serialization

Mark Salsbery30-Jan-08 7:06

Mark Salsbery

30-Jan-08 7:06

CTypedPtrList is serializable?

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: Multiple Application Serialization

James R. Twine30-Jan-08 7:19

James R. Twine

30-Jan-08 7:19

Sure! But the pointers in it are another story... Laugh | :laugh:

Peace!

-=- James
Please rate this message - let me know if I helped or not!<hr></hr>If you think it costs a lot to do it right, just wait until you find out how much it costs to do it wrong!
Remember that Professional Driver on Closed Course does not mean your Dumb Ass on a Public Road!
See DeleteFXPFiles

Re: Multiple Application Serialization

Mark Salsbery30-Jan-08 7:32

Mark Salsbery

30-Jan-08 7:32

I have doubt

Laugh | :laugh:

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: Multiple Application Serialization

CPallini30-Jan-08 21:14

CPallini

30-Jan-08 21:14

Well, everything is serializable Poke tongue | ;-P

(Uhm, I've a little doubt about democracy...), with just a bit effort into.
Smile | :)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

[my articles]

ReadDirectoryChangesW vs FindFirstFile (on file server hosting mac file system)

Peter Weyzen29-Jan-08 12:58

Peter Weyzen

29-Jan-08 12:58

I have a case where a file path reported by ReadDirectoryChangesW is different from the correct path...

The case is a file server -- where a mac file system is hosted on an ntfs volume. The mac file system seems to have some extra stuff.

When I access the files locally (from the file server), I run into some problems:

Here's a very long filename reported from the system file change via ReadDirectoryChangesW()

C:\dev\macbug1\.BAHC3Kq7\This is the Mac folder\In this folder I will store some mac image files\this is just a folder with a long filename  - In this folder I will store some mac image files\another In this folder I will store some mac image files\This folder contains some pictures of the new cooooooool  macboc air\overview_bigair_one20080115.png

This very long path contains a folder which doesn't seem to actually be there... .BAHC3Kq7\

If I use FindFirstFile I can correctly find the files and folders as they seem to be there.
But this contradicting path from the changes API is causing me problems.

Any thoughts out there?

Are there any good references on the insides of how a mac file system is stored on NTFS?

Thanks in advance -- this is such an esoteric question, I won't hold my breath waiting for an answer.
But it's always good to ask!

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~<br />
Peter Weyzen<br />
Staff Engineer<br />
<a href="http://www.soonr.com">SoonR Inc -- PC Power delivered to your phone</a>

Re: ReadDirectoryChangesW vs FindFirstFile (on file server hosting mac file system)

James R. Twine30-Jan-08 7:08

James R. Twine

30-Jan-08 7:08

Remote change notifications are not reliable on remote filesystems, especially when the remote filesystem is hosted on a non-Windows platform. The path is also longer than _MAX_PATH, so you would not be able to access the path using the normal (ANSI) APIs - you would have to use the Unicode version of the APIs.

Peace!

Re: ReadDirectoryChangesW vs FindFirstFile (on file server hosting mac file system)

Peter Weyzen30-Jan-08 7:56

Peter Weyzen

30-Jan-08 7:56

I don't have an issue with MAX_PATH, I am using unicode API's with the funky \\?\ prefix. (everyone should use unicode!)

The filesystem isn't remote though. My software is running locally on the same machine where the file system is stored. It's just that the folder structure is created by a mac which is connected to my machine remotely. But, to my software, the file system is local.

If I scan the folders using FindFirstFile I don't get the artifact. The file paths coming back from ReadDirectoryChangesW include it.

I cannot use any sort of GetShortFileName(), GetLongFileName() function -- because in the case of a "delete file" notification, these functions don't work. I need a more systemic answer -- one which operates on the path not on the file -- to deal with this.

I guess, I am going to have to implement a periodic scan to make sure that I have accurate information. But mostly, I am trying to figure out what that mysterious artifact is, in the path that I get back from ReadDirectoryChangesW().

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~<br />
Peter Weyzen<br />
Staff Engineer<br />
<a href="http://www.soonr.com">SoonR Inc -- PC Power delivered to your phone</a>

Which process opened a file?

daavena29-Jan-08 10:54

daavena

29-Jan-08 10:54

Hi all,

could you give me a little hint how to get a name of process which opened file?

example:
I have a file C:\temp\test.txt - I need to know which process opened this file.

Thanks.

Re: Which process opened a file?

Randor 29-Jan-08 11:55

Randor

29-Jan-08 11:55

You can use NtQuerySystemInformation() and pass 'SystemHandleInformation' as the SYSTEM_INFORMATION_CLASS. You will need to iterate through the returned buffer and locate the handle and match it with the process ID.

http://msdn2.microsoft.com/en-us/library/ms724509.aspx[^]

http://www.codeguru.com/Cpp/W-P/system/processesmodules/article.php/c2827[^]

Best Wishes,
-David Delaune

Re: Which process opened a file?

Stephen Hewitt29-Jan-08 12:40

Stephen Hewitt

29-Jan-08 12:40

Do you want a utility to do this or know how to code it yourself? SysInternals have utilities that can tell you this information.

Steve

Re: Which process opened a file?

Hamid_RT29-Jan-08 18:17

Hamid_RT

29-Jan-08 18:17

Did you need to this code?

DWORD m_Return=GetModuleFileNameEx(hProcess, hModuleHandle, str1, sizeof(str1) );

Concerning drivers...

Eikthrynir29-Jan-08 10:40

Eikthrynir

29-Jan-08 10:40

Hello!

I have a few questions concerning drivers. I don't know if this is the right board to post this kind of problems but here they are:

1. I want to create a keyboard filter driver. Is there any method that can ensure no other filter driver (keylogger) will attach to the keyboard driver (between the keyboard driver and my filter driver) ?

2. I want to create another filter driver that will be installed nearest to a specified application (so that no other filter driver can get between this filter driver and the application). If this is possible, could anyone help me with a few links to documentation involving this kind of issues?

3. Is there any API which I can use to check whether a driver is digitally signed?

Thanks in advance!

modified on Tuesday, January 29, 2008 4:50:54 PM

Re: Concerning drivers...

Randor 29-Jan-08 11:39

Randor

29-Jan-08 11:39

Eikthrynir wrote:
1. I want to create a keyboard filter driver. Is there any method that can ensure no other filter driver (keylogger) will attach to the keyboard driver (between the keyboard driver and my filter driver) ?

The only thing I can think of is modifying the EAT of ntoskrnl and hooking IoCreateDevice. You would need to block devices of type FILE_DEVICE_KEYBOARD from being created. Perhaps the same could be accomplished later by hooking IoAttachDeviceToDeviceStack.

Eikthrynir wrote:
2. I want to create another filter driver that will be installed nearest to a specified application (so that no other filter driver can get between this filter driver and the application). If this is possible, could anyone help me with a few links to documentation involving this kind of issues?

Your ring-3 application will need to communicate with the keyboard filter driver through an IOCTL dispatch interface. You could obfuscate or encrypt communication with the driver, and/or from within the driver you should verify the sender by checksum of its PE image or whatever clever scheme you can think of.

Eikthrynir wrote:
3. Is there any API which I can use to check whether a driver is digitally signed?

Perhaps you should read some Microsoft documentation about kernel driver signing.
http://www.microsoft.com/whdc/winlogo/drvsign/kmcs_walkthrough.mspx[^]

Best Wishes,
-David Delaune

Re: Concerning drivers...

Eikthrynir29-Jan-08 17:57

Eikthrynir

29-Jan-08 17:57

At the second question I forgot to mention that the application I want to communicate with is not created by me. So it's impossible for me to modify it. I'm searching for a solution involving the modification of the driver only...

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