C / C++ / MFC

27-Oct-02 3:36

Hi there.

Im working on a project at the moment a sort of Search program if you will. However there is obviously going to be a problem with the system if the user doesnt use it for so many days, files will have been deleted / created / modified etc.

A solution would be a small program which logged files changes to a text file. Such as new files created, modified, moved, deleted etc. This file would be loaded by the main app and the database updated.

I have researched Visual Basic and found out about "hooks". However i dont believe these stretch to this kind of activity and as ill link to below the program below uses C++.

The following program does what i want i suppose, and the source code is free, but theres no explanation to much of it and i was wondering if anyone had tutorials / source code on this complex thing.

http://www.sysinternals.com/ntw2k/source/filemon.shtml

Thanks greatly.

Gavin

Ravi Bhavnani27-Oct-02 3:43

27-Oct-02 3:43

See this[^] article.

/ravi

Let's put "civil" back in "civilization"
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Anonymous27-Oct-02 4:02

27-Oct-02 4:02

Thank you soo much. Smile | :)

The only thing is though to make that monitor every fixed hard drive i would probably have to do a recursive search through each directory, which would be a major hit on performance for something thats running the background.

Any suggestions?

(Ive posted this without looking at the code so i may be able to work it for myself.)

Thanks.

Gav

Anonymous27-Oct-02 4:05

27-Oct-02 4:05

Forgot my password!

Ive just found out that code only works on Windows NT / 2000 and XP. Which isnt any use to me as im on Windows 98 SE.

Gutted Frown | :(

Thanks again for the information but if anyone has anymore information etc i would be very grateful!

Gav

Ravi Bhavnani27-Oct-02 4:09

27-Oct-02 4:09

I think you'd need to do the recursive search once. After that, you may be able to use this class[^] to add/remove directories of interest. It would be cool if you wrote a new version of Wes Jones' CDirectoryChangeWatcher class that supported recursive watches!

/ravi

Let's put "civil" back in "civilization"
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ravib@ravib.com

Anonymous27-Oct-02 7:46

27-Oct-02 7:46

Thanks again for your help.

Damn... this is going to take some coding!

Does the code you suggested work with Windows 98?

Thanks for all your input.

Any other suggestions from other people?

Gav

Ravi Bhavnani27-Oct-02 9:32

Serializing and class hierarchy

27-Oct-02 9:32

Anonymous wrote:
Does the code you suggested work with Windows 98?

Sorry, I haven't used these classes.

/ravi

Let's put "civil" back in "civilization"
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Conan Ua Diarmaid27-Oct-02 3:32

Conan Ua Diarmaid

27-Oct-02 3:32

hi,
I have a base class say,CEmployee and other derived classes say CManager,CDirector etc.
CEmployee is CObject derived for getting all those features from CObject.
Now,I have a list of employees (CEmployee*) in stl list<> and I serialize them.Everything is fine while storing,but while loading i cannot get the correct class and will just read CEmployee.
How to use the RTTI for serialization.

-Conan

Ravi Bhavnani27-Oct-02 3:41

Yah, read that but not enough info.

27-Oct-02 3:41

See this series[^] of articles.

/ravi

Let's put "civil" back in "civilization"
http://www.ravib.com
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Con27-Oct-02 4:24

Re: Yah, read that but not enough info.

27-Oct-02 4:24

Yah, read that but not enough info.

Ravi Bhavnani27-Oct-02 4:30

27-Oct-02 4:30

When you save the objects to disk, the first thing you should serialize is the object's signature (or RTTI information), followed by the object itself. When you read back the object from disk, use a ClassFactory pattern to construct an object of the appropriate type, then serialize (read in) the object.

/ravi

Let's put "civil" back in "civilization"
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Re: Class Factory

Con27-Oct-02 4:35

27-Oct-02 4:35

:-DSorry if i am a pain but its bit tricky at the moment.

Should I implement the class factory .If we use CObList or something,everything gets done from CArchive.But i am using stl list<> holding pointers.How to implement it?

Re: Class Factory

Ravi Bhavnani27-Oct-02 4:45

27-Oct-02 4:45

Write the employee list to disk like this:

for (each employee in list) {
  CString strSignature;
  *pArchive << pEmployee->getSignature();
  pEmployee->serialize (pArchive);
}

When you read the object from disk, do this:

CString strSignature;
strSignature << *pArchive;
CEmployee* pEmployee = EmployeeClassFactory.createObject (strSignature);
if (pEmployee == NULL) {
   // bad object read in
} else {
   pEmployee->serialize (pArchive);
}

// Add pEmployee to list - doesn't matter if it's STL or not

/ravi

Let's put "civil" back in "civilization"
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ravib@ravib.com

Re: Last One

Con27-Oct-02 4:52

27-Oct-02 4:52

So this means I will have to write my own class factory.
Why can't ar>> pEmployee do the job here when a similar thing can do it for CObList in the MSDN sample DrawCli.

Thanx for answering

Re: Last One

Ravi Bhavnani27-Oct-02 10:38

27-Oct-02 10:38

I haven't seen the DRAWCLI sample. If it works by using the streaming operator >>, it's because the Employee class's >> operator is doing the work of a class factory.

/ravi

Let's put "civil" back in "civilization"
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ravib@ravib.com

Gero Gerber27-Oct-02 3:44

Gero Gerber

27-Oct-02 3:44

Before storing each object save an identifier for each object. Use CObject::GetRuntimeClass() and store CRuntimeClass::m_lpszClassName before actually saving an object. While loading read the string and create an appropriate instance of the class and serialize it.

Gero

Con27-Oct-02 4:25

27-Oct-02 4:25

How to load a pointer into the list using CRuntimeClass name?

Gero Gerber27-Oct-02 4:43

Gero Gerber

27-Oct-02 4:43

How do you exactly serialize the list currently?

Gero

Re: Like this

Con27-Oct-02 4:55