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Hi all,
I've been assigned the task of writing a filter driver to intercept IO calls to storage devices and selectively allow (or dissallow) them through.
I'm quite new to drivers so I was wondering if anyone could point me to a good starting point.
Thanks for your help,
Mark
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Althought there are a few articles here[^] and here[^], my guess is you might need to refer to a book on writing NT drivers.
/ravi
My new year's resolution: 2048 x 1536
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ravib@ravib.com
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How to Change the Position of the DialogBox?
dadsadasd
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SetWindowPos(...) inthe initdialog will do the trick.
MSN Messenger.
prakashnadar@msn.com
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First let me explain what I'm hoping to do. I want to generate a program that will load a bitmap from a resource for now. I will worry about loading it from a file later. I want 2 copies of the bitmap to be made. one with a red tint and one with a blue tint. and hide or deload the orginal bitmap. So i would now have a red tinted bitmap and a blue tinted bitmap of the orginal image.
With that being said I think I could do the rest. I want to overly the blue image ontop of the red image with it shifted to the right. This will make a 3d image.
In any event with that being said how do you tint a bitmap. Lets say I have IDB_PICTURE as my bitmap. after doing some research on google i'm lead to believe that i would make a pointer to the bitmap and then simply lower its rgb's. That all sounds fine and dandy but how? I mean i know what a pointer is but how do reset the rgbs with it and let it know its a bitmap and such. I hope my question is clear if not i'll do my best to rephrase it.
A link with good commented code would be great or simply an example of workable code here whichever works would be fine. I just thought it would be cool to make a 3d program.
thanks for the help
Win32newb
"Making windows programs worse than they already are"
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win32newb wrote:
I want to overly the blue image ontop of the red image with it shifted to the right. This will make a 3d image.
the bitmaps would have to be transparent other wise the overlaying bitmap will hide the bitmap below spoiling the 3d Effect
you should rethink about using bitmaps (if only outline images are there you might consider using emf files)
C makes it easy to shoot yourself in the foot; C++ makes it harder, but when you do, it blows away your whole leg
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alright i see your point as far as the tranparent goes but i thought in visual c++ that was the whole point of the transparent feature in extended styles. I figured I would start with bitmaps first just so i familarize myself with the concept. Then move on to something more advanced.
Any help on this matter would be great and thanks
Win32newb
"Making windows programs worse than they already are"
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if you are using MFC and won't mind third party classes to assist you in image manipulation CxImage[^] is the class for you.
otherwise if you prefer to use win32 functions then you will have to use the LoadImage function as it can load an image from a resource or from a file.
After Loading the image on a DC you can call GetDIBits function to retrieve the pointer to the actual rgb Values.
(if you are unsure or find all this too tedious go for a tried and tested class to manipulate Images)
Hope it helps 
C makes it easy to shoot yourself in the foot; C++ makes it harder, but when you do, it blows away your whole leg
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Hi,
I've written a small administration tool that does some processing on removable devices. The problem is I need to lock the volume before processing. I have managed to do this but only if noone is using the volume at the time when I am locking. Can I gain exclusive access over a volume and force other processes to not use it for a while?
Mark
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This is not possible.
The FSCTL_LOCK_VOLUME flag requires that there are no open files on the target device before you lock it. If this is a removable device, you can order the disk management system to dismount and remount the device programmatically, which will cause all access to the device to flush and stop. After the remount, you can open and exclusively lock the device.
The best alternative is to enter a while-loop in your program, that will periodically attempt to lock the volume, and when it succeeds, it will then start the processing.
Using a function to exclusively lock a drive and force all others out instantly is considered very bad behaviour from a software. What if the user is copying e.g. images from a camera device when you force the file copier out from the camera's media and lock it ? This, in the worst case, could cause the copier program to end into an access violation error. Using this when a disk defragmenter or similar is in use might even break the hardware or the disk's index system.
You should redesign your application layout so that it can wait for it's turn in order to start the processing work. This is much more favorable than exclusive locking.
If you MUST get exclusive access, then first open the device handle, then dismount it. After that, call GetLogicalDrives which will attempt to remount the device. Enter a successive loop that tries to open the device and lock it. When done, start your processing.
-Antti Keskinen
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The definition of impossible is strictly dependant
on what we think is possible.
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Thanks... I will try that
This processing will take place at night so no users should be using the PCs in the office at that time. This is just a precautionary measure.
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I'm trying to create a bitmask to say what fields in a database are valid. This would be very much like the LIVF_* items for the LVITEM structure that say what fields in the structure are valid. I'm know pretty much how to setup the bitmask and the flags for it, but I've no idea how I should really use it. Any help is much appreciated. Thanks.
- Aaron
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You just need to use a logical mask, such as 010011. This mask would mean that from an SQL query string, the second, fifth and sixth returned column on each row contain valid values.
There is no actual function which you could use to order a database driver (such as ODBC) to mask certain values. The driver will return all valid values it can extract from the database. It is your job to use e.g. the returned CRecordset-object and mask certain columns from it.
Alternatively, could it be that your application needs redesigning ? After all, if you use an ODBC extension class from here in CodeProject, you can execute an arbitary query into a database and fetch columns by their index or by names. In this case, you wouldn't need a bitmask at all.
-Antti Keskinen
----------------------------------------------
The definition of impossible is strictly dependant
on what we think is possible.
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Is there any way i can have a modeless form of Messagebox or afxmessagebox?
Thanx.
MSN Messenger.
prakashnadar@msn.com
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Unfortunately no, since standard Windows message boxes are modal beasts. But you can craft your own by turning this[^] into a modeless dialog. And when you do, please post the article at CP. Thanks!
/ravi
My new year's resolution: 2048 x 1536
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ravib@ravib.com
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Very Smart, you are throwing the question back at me. 
MSN Messenger.
prakashnadar@msn.com
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I'm not throwing anything back at you. I just pointed you to a class that you could potentially modify to suit your needs. If get your mod to work, it would likely be useful to the rest of the CP community. Sorry if my suggestion offended you.
/ravi
My new year's resolution: 2048 x 1536
Home | Articles | Freeware | Music
ravib@ravib.com
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Ravi Bhavnani wrote:
Sorry if my suggestion offended you.
Nah! i was just kidding. I just wanted to know wheather its possible using any standard method. I know i have to write my own in the worst case. 
Ravi Bhavnani wrote:
If get your mod to work, it would likely be useful to the rest of the CP community
Yeah i will try to do that. 
MSN Messenger.
prakashnadar@msn.com
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If it is a message box to notify the user of some error then consider a balloon tip instead. MessageBox's are a pain in most circumstances as they force the user to stop in their tracks, grab the mouse and click a button. ie. They are very intrusive, which a good UI shouldn't be.![Rose | [Rose]](https://codeproject.global.ssl.fastly.net/script/Forums/Images/rose.gif)
Neville Franks, Author of ED for Windows www.getsoft.com and coming soon: Surfulater www.surfulater.com
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i m trying to debug a dll and when i try to attach it to a running process, i don't see any process in the process dialog box WHY?
steps:
1: create new dll project
2: do anything.....
3: from the debug menu select start debug option
4: then select attach to process
5: now the process dialog box appears
now i have to select a process from the list but on my system i don't see any process in this process dialog.
Dev
Dev
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deyadav wrote:
i don't see any process in this process dialog
i have no idea why is that happening but as far as i can remember if you are trying to debug a dll then the process attached should load ur dll explicitly or implicitly only then the DllMain gets called, so make a super simple app which calls LoadLibrary("urdll"); and then in dll project put the exe path
Hope it helps
C makes it easy to shoot yourself in the foot; C++ makes it harder, but when you do, it blows away your whole leg
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i made a sample application and before i try to debug the dll i run the sample application so that i can select it from the process dialog, but there i don't see anything.....
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after making the dll press f5 to debug it a messagbox will come asking for the location of the exe to load enter the path of the executable in that
hope that helps
C makes it easy to shoot yourself in the foot; C++ makes it harder, but when you do, it blows away your whole leg
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thankx for ur reply but my problem is I DON'T SEE the processes in the process dialog....
Build|Start debug|Attach to process...
now in the process dialog all the running processes r there.... but on my system it's blank(not a single process is there)..... YYYYYYY is my question.... do i have to make any settings for this??????
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This command allows you to attach the debugger into an existing process. It does not allow you to attach your DLL into an existing process.
What you need to do is create a simple application that loads your DLL. Then set a breakpoint into the DLL's DllMain function. Now, run the sample application in debug mode, and after the LoadLibrary call, the DllMain's breakpoint gets fired.
At least on my computer I was able to attach the debugger into a remote process, break it, run through a set of assembly code lines, and then terminate it.
Might it be that you don't have any processes running, or that your user has no rights to see them ? Check CTRL+ALT+DEL and Task Manager. Can you see the processes there ?
-Antti Keskinen
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The definition of impossible is strictly dependant
on what we think is possible.
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