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RomTibi wrote: Is it possible in VC++ and/or MFC?
Yes, Absolutely.
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Thx 4 quoting me ![Rose | [Rose]](https://www.codeproject.com/script/Forums/Images/rose.gif) but I really need 2 know how to do it 
36. When you surround an army, leave an outlet free.
...
Do not press a desperate foe too hard.
SUN-TZU - Art of War
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Hi,
Why do you need someone to show you how to do this? What have you tried so far? Did it succeed or fail?
It looks like all you need to do is create a USB_DEVICE_DESCRIPTOR structure and call DeviceIoControl with the IOCTL_USB_GET_DESCRIPTOR_FROM_NODE_CONNECTION control code.
Best Wishes,
-David Delaune
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I've tested in VC++10:
- declared locally the COMCTL for IOCTL_USB_GET_DESCRIPTOR_FROM_NODE_CONNECTION
- declared locally the structure USB_NODE_CONNECTION_INFORMATION
and DeviceIoControl() returned NULL. GetLastError() returned ... 50 ERROR_NOT_SUPPORTED.
Can you tell me why? pls
36. When you surround an army, leave an outlet free.
...
Do not press a desperate foe too hard.
SUN-TZU - Art of War
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Hi,
With that error... it sounds like you are sending the control code to the wrong device. What handle are you passing to DeviceIoControl?
I would suggest that you use this sample:
www.intel.com/intelpress/usb/examples/DUSBVC.PDF[^]
I have compiled it and confirmed that it works with the 7600.16385.1 DDK. Just paste the code from the Intel PDF file into a Multi-Byte console application created from Visual Studio. You will need to add this #include path to the project:
\7600.16385.1\inc\api
Copy and paste programming at its best.
Best Wishes,
-Copy&Paste
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My project is to make an app that erases media (HDD, USB flash, USB HDD, etc.) showing some information on them. I use \\.\PhysicalDriveX to access the media for details on the size and type (fixed, removable, etc.).
I found that the registry key HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\Disk\Enum\
keeps up-to-date the drives in order that they are attached.
First it comes the first HDD - subkey "0" something like IDE\DiskWDC_WD5000BEVT-0A0RT0__________________01.01A01\5&2c0d176e&0&0.0.0, next, the next HDD ... .
Then follows the USB devices, in the order that they were attached.
Here comes trouble...
Consider you have 1 HDD and 2 USB devices A and B.
Subkey 0 holds data for the HDD.
Attach A, subkey 1 holds data for A.
Attach B, subkey 2 holds data for B.
Detach A, subkey 1 holds data for B.
Attach A, subkey 2 holds data for A.
... and all this time ...
A remained \\.\PhysicalDrive1
B remained \\.\PhysicalDrive2
I can`t count on registry for that information, so I have to obtain them - via DeviceIoControl with a handle for \\.\PhysicalDriveX so I can map the devices to the description, exactly.
I hope that is clear enough, now, what is my problem.
36. When you surround an army, leave an outlet free.
...
Do not press a desperate foe too hard.
SUN-TZU - Art of War
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Hi,
Could you be a little more clear about the exact problem you are having? While I do understand the problem you mention in your last post... I fail to see how this relates to the original post where you stated that you need 'manufacturer, type, revision'
Someone asked me a similar question a few years ago. Maybe you will find something useful there. Here is the post[^].
If you need to know which physical drive such as \\.\PhysicalDrive1 then you should investigate the IOCTL_STORAGE_GET_DEVICE_NUMBER control code[^] and populate a STORAGE_DEVICE_NUMBER structure[^].
If you are having problems identifying the USB device after the user has moved the USB device... maybe you should investigate the IOCTL_STORAGE_GET_MEDIA_SERIAL_NUMBER control code[^] and populate a MEDIA_SERIAL_NUMBER_DATA structure[^].
All of this info combined with the Intel sample should give you enough to uniquely identifying drives.
Best Wishes,
-David Delaune
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In this App I use DeviceIoControl to accomplish the following tasks:
- enumerate the PhysicalDriveX devices
- determine nr. of bytes to be overwritten
- for ATA devices determine the Vendor, Product and Revision http://www.winsim.com/diskid32/diskid32.html[^] [http://www.winsim.com/diskid32/diskid32.html[^]] for the reason that the user not to erase a drive that is not intended to.
And all this via a HANDLE from CreateFile("\\\\.\\PhysicalDriveX", ...)
Everything goes OK for ATA, not for USB. In my previous post I have shown an example on how you can`t rely on
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\Disk\Enum\N because USB devices are presented in the order they were attached.
So, the question is: can I obtain with a HANDLE created by
CreateFile("\\\\.\\PhysicalDriveX", ...)
data reffering to manufacturer, type, revision for a USB attached storage device?
36. When you surround an army, leave an outlet free.
...
Do not press a desperate foe too hard.
SUN-TZU - Art of War
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RomTibi,
I completely understand your problem now. You have a HANDLE to a physical drive and want to somehow associate that back to the USB device. I spent about 10 minutes looking into this... and I did not find any way to use DeviceIoControl because there are no documented IOCTL codes that will do this. I did not find any documented methods for using a HANDLE to a physical drive for obtaining information about the parent USB device.
However... you can absolutely do this using the Windows SetupAPI[^].
You could call the SetupDiGetClassDevs function[^] with the GUID_DEVINTERFACE_DISK class[^] and enumerate all of the storage devices using SetupDiEnumDeviceInterfaces[^] and call the SetupDiGetDeviceInterfaceDetail function[^] to get the drive path and serial. You can then call the CM_Get_Parent function[^] to get the parent USB device and retrieve these details.
Please spend some time researching this... if you cannot figure it out let me know and when I have more free time I may be able to write a sample function for you.
Best Wishes,
-David Delaune
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Thank you!
I`ll do what you said.
Waiting for your answer I found this:
http://code.msdn.microsoft.com/CppStorageEnum-90ad5fa9[^]
I`ve tested a few, it seem to work, but it is to clean up a lot, maybe to include the dll code in the main.
I`ll keep you up to date with my progress.
Thanks again! 
36. When you surround an army, leave an outlet free.
...
Do not press a desperate foe too hard.
SUN-TZU - Art of War
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Happy 9 years and 2 days of CodeProject!
I worked a little around the example I found but I wasn`t able to port in VC++6. If you can give me some advice I would be gratefull... 
36. When you surround an army, leave an outlet free.
...
Do not press a desperate foe too hard.
SUN-TZU - Art of War
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RomTibi wrote: Happy 9 years and 2 days of CodeProject!
Thanks!
I have actually been a member here on codeproject for around 11 years but I forgot the password to my first account and created this one to replace it.
RomTibi wrote: I worked a little around the example I found but I wasn`t able to port in VC++6.
If you can give me some advice I would be gratefull...
Almost everything can be ported to VC6 with the exception of some of the modern C++ templated code and C++11.
What version of the Platform SDK are you using with VC6?
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Hi RomTibi,
No I don't mind at all. But I don't think anyone will be able to answer your question because to convert that project to VC6 takes alot of work and patience. You will just need to copy alot of Setup API structs and defines into a new header.
If I have some free time this weekend I'll investigate it.
Best Wishes,
-David Delaune
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THX! 
36. When you surround an army, leave an outlet free.
...
Do not press a desperate foe too hard.
SUN-TZU - Art of War
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Hi,
Just wanted to drop in and let you know that I have not forgotten about your issue. Unfortunately I was out of town last weekend and did not write any code. I still have it on my TODO list so let me know if you have solved your problem.
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Thanks! Wait ...![Rose | [Rose]](https://codeproject.global.ssl.fastly.net/script/Forums/Images/rose.gif)
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Hmmmm,
Who are you? Are you RomTibi?
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Randor wrote: Hmmmm,
Who are you? Are you RomTibi?
yeap 
if u don`t mind
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Hi, I have a program, it should be possible to optimize. I need advice: what program or application will to monitor how much memory is allocated to a given block of objects.
Thanks 
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You can calculate it quite easily using the sizeof[^] operator.
Unrequited desire is character building. OriginalGriff
I'm sitting here giving you a standing ovation - Len Goodman
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Hi,
You can do this yourself from within Visual Studio by utilizing the CRT Debug Heap.
Debug Hook Function Writing[^]
Some other tips for reducing your application resources:
1.) Review all of your GDI code and optimize it. Try to reuse PEN,BRUSH and FONT objects. I have seen some engineers write GDI code that creates 10-15 GDI objects when they could have simply changed the properties of 2-3 existing GDI objects and reused them.
2.) Go through all of your data structures and check for unoptimized Data structure alignment[^].
3.) Comb through all of the functions in the project and look for ways to refactor and reuse variables. Modern C++ compilers such as Visual Studio will attempt to honor the scope "{" "}" operators. Most engineers believe: "Oh, don't worry... the C++ optimizer is so great that it will optimize those Temp variables away". While this is true to a certain extent... the compiler may also attempt to honor your scope brackets and this can sometimes lead to an increased usage of stack space depending on compiler settings.
4.) Comb through all of the functions and look for functions that are passing objects by value rather than by reference. Investigate to see if it is feasable to refactor the code so that the objects are passed by reference.
Thats all I can think of for reducing memory usage. Actually come to think of it... if your application is allocating thousands/millions of small objects... you might want to investigate the Low-fragmentation Heap[^]. All it really does is use a different algorithm for allocating memory that is tuned for smaller objects. When your application memory is massively fragmented... the problem for the allocator to solve is sorta like the 'knapsack problem' or 'bin-packing problem' however... the because the allocator sometimes can't find an already-allocated spot in the memory pool... it may just increases the size of the available pool.
Best Wishes,
-David Delaune
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You can try deleaker Add-in for Visual C++ - I usually use it.
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C program to replace all the letters of a string with all 26 alphabets and to do permutations to all the substituted ones and finally store the resulted strings in a file..
please help me out in fixing this situation..
To be clear. let me quote an example:
If i havva simple 2 letter word eg: "TO". Then those two letters in the String "TO" are to be replaced by 26 English alphabets character by character individually..
like>>>
Given string: TO
OUTPUT should be like:
AO
BO
CO
DO
EO
.
.
.
ZO
and
TA
TB
TC
TD
TE
.
.
.
.
TZ
and the above generated string permutations(with repetition {n^r} ). such that we should get 26*26 ie.,676 permutations.
I hope u understood the logic..
And these whole set of 676 strings are to be stored in a file.
thanq...
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