C / C++ / MFC

20-Jan-05 6:23

I have a 3rd party program that writes data to a selected file.
Instead of having the program write to a file, I'd like to be able to create a virtual file and capture the data the program writes.

I've tried doing it with named pipes, but I can't get it to work*.
Are there any other ways to create a virtual file?

Thanks

* Even though a simple CreateFile,WriteFile,CloseFile program works, the copy command returns "All pipe instances are busy." error and GUI programs just hang for a few seconds after I press save.

David Crow20-Jan-05 7:04

20-Jan-05 7:04

Forjer wrote:
I'd like to be able to create a virtual file and capture the data the program writes.

Do you mean intercept "write" calls to a certain file? If so, check out this utility.

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

forjer20-Jan-05 8:15

20-Jan-05 8:15

I'm familiar with Filemon, but it doesn't help me get the data and skip the disk writing.

David Crow20-Jan-05 8:22

20-Jan-05 8:22

I was simply providing the link to give you an idea as to what is involved in intercepting file I/O. Suffice it to say, it's not a trivial undertaking.

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

forjer20-Jan-05 9:59

20-Jan-05 9:59

I thought I could avoid api hooking because I can control the output file name.
I'm currently looking into madCollection as it appears I have to use api hooking.

RaajaOfSelf20-Jan-05 9:18

RaajaOfSelf

20-Jan-05 9:18

Hi ,
WHat about memory mapped files ??? Iam not sure what you are looking for ....but looks like memory mapped file might help you ...

Cause is my effort;
Effect is God's effort

forjer20-Jan-05 10:06

SetThreadLocale does not work?

20-Jan-05 10:06

That's not going to help in my case.

BadJerry20-Jan-05 5:59

BadJerry

20-Jan-05 5:59

SetThreadLocale does not seem to work... or does not do what I want it to do : on a computer with regional settings set to French (meaning the decimal point will be a comma), the following code

_tsetlocale(LC_ALL, _T(""));
BOOL bResult = ::SetThreadLocale(MAKELCID(MAKELANGID(LANG_ENGLISH,SUBLANG_DEFAULT),SORT_DEFAULT));

CString strResult;
strResult.Format(_T("%.15g"),0.444);

::SetThreadLocale(LOCALE_USER_DEFAULT);

will write 0,444 in strResult and not the expected 0.444. I do not want to use _tsetlocale because all threads would be affected... and I do not want to have to synchronise them!
It seems like SetThreadLocale only allows you to change which resource you will access.
Any idea? Anything? Thanks in advance!

hooking a url

BlackDice20-Jan-05 5:31

BlackDice

20-Jan-05 5:31

I'm thinking of writing a small utitlity app (or service) for my company to hook a certain url, and notify or stop the user from going there. For instance, if the user opens any browser (firefox, ie, etc) they should be able to go anywhere they want. But I would like to be able to detect if they go to www.notthissite.com/badpage.htm, and block it out or stop it. The reason for this is that we have an application that has a browser control that takes them to a specific url for data entry purposes. We also keep track of this input data in a database also, so we don't want them to put the data in through ie or firefox or whatever. I've come up with a few theories, but I don't know if any of them make any sense, so I'm just looking for any kind of input. Thanks in advance!!

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BlackDice

Re: hooking a url

David Crow20-Jan-05 5:38

20-Jan-05 5:38

Blacklisting URLs is best done at the firewall or gateway. That's one of the features they provide. Is there a reason why you can't go this route?

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

Re: hooking a url

BlackDice20-Jan-05 5:59

BlackDice

20-Jan-05 5:59

well, our app needs to have access to it. Also, they should be able to go to www.that.com or www.that.com/products.htm, but not www.that.com/dataentry.htm. However, our app should be the ONLY one to be able to access this particular specific page. Our network admin knows about firewalls (which is why I can only get to a few select sites Smile | :)

), but the guy who worked on the app that hosts the web browser control said that he spoke to him and I guess they didn't come up with a solution. Plus, I don't know exactly what rights we'll be granted to their network, so I was thinking that having an app/service running that's part of our install would be the best solution. I don't know much about networking or firewalls myself, but would it be possible to only allow one .exe to access a certain url through the firewall settings?

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BlackDice

Re: hooking a url

David Crow20-Jan-05 7:02

20-Jan-05 7:02

BlackDice wrote:
I don't know much about networking or firewalls myself, but would it be possible to only allow one .exe to access a certain url through the firewall settings?

Possibly, but it's more conceivable to limit or deny access at the IP address level (i.e., only allow IP addresses in the xxx to yyy range to access this site).

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

STL map problem

aRtsZ20-Jan-05 5:27

aRtsZ

20-Jan-05 5:27

Can I declare the map class as follows?

typedef queue<unsigned char=""> clientBuf;
map<int,clientbuf> buffers;

Thanks a lot!

toxcct20-Jan-05 6:24

toxcct

20-Jan-05 6:24

if you previsouly declared using namespace std;,
yes, you can use map<key_type, value_type> myMap;

for example :

<font color=#008000>// To be able to use the STL class std::map<></font>
<font color=#0000FF>#include</font><map>
 
<font color=#008000>// To avoid typing std::map everytime...</font>
<font color=#0000FF>using namespace</font> std;
 
<font color=#0000FF>void</font> main(<font color=#0000FF>void</font>) {
    map<CString, <font color=#0000FF>int</font>> myMap;
    myMap["toxcct"] = 1;
}

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

aRtsZ21-Jan-05 3:14

aRtsZ

21-Jan-05 3:14

Thanks a lot.
I would like to ask one more question. Can I replace the "int" with a class that is defined by myself?
Really thx~

toxcct22-Jan-05 1:11

toxcct

22-Jan-05 1:11

of course, my answer was just an example...

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