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If you use the nested loop do something. you can count the time, if overtime, show one your timeout excetpion to goto the outest .
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Hi,
How to generate this type of number in header files?
#if !defined(AFX_COL_H__1C5B8C95_F2A0_424C_9CAB_CCF5E76B642E__INCLUDED_)
#define AFX_COL_H__1C5B8C95_F2A0_424C_9CAB_CCF5E76B642E__INCLUDED_
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They are usually generated automatically when you create a new class through the MFC wizard.
On the other hand, you can perfectly attribute one yourself, usually the filename is used in someone (e.g. MYFILE_H). As long as the identifier is unique, its perfectly fine. You can also use the #pragma once directive which has been added in more recent compiler versions.
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To get new GUIDs you've to use guidgen tool, see here[^] for the steps required to run the tool from the Visual Studio IDE.
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.
This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke
[My articles]
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The other replies must be good enough for you.
Nevertheless, you can do this programmatically using APIs like UuidCreate, UuidCreateSequential etc.
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Thank you!
I thought there might be a way to generate the uid along with the header creation.
In the above all replies we've to get uid separately and then append it to the header macro separately....
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But my visual studio do not output uid insteaded by "#pragma once" 
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Is there any way to find how many instance of an applications are running?
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using EnumWindows API.
Which is give the handle of running applications .
Get window text from from CWnd * wnd and compare text with your application name.
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Click here ->[^]
May be this link will help you..
Yes U Can ...If U Can ,Dream it , U can do it ...ICAN
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As long as your code compiles to an exe, you can do it this way:
- Add the following lines on top of one of your cpp files:
#pragma data_seg("shared")
LONG g_counter = 0; #pragma data_seg()
#pragma comment(linker, "/section:shared,rws") - Execute the following instruction as soon as possible at startup of your application:
InterlockedIncrement(&g_counter); - Execute the following instruction immediately before exiting from your application:
InterlockedDecrement(&g_counter); - When you need the number of instance of your application currently running, use this code:
LONG instances = InterlockedExchangeAdd(&g_counter, 0);
This method works properly only with exe because they are never relocated while loaded; the trick is to create a section whith the read, write and shared attributes and put there a variable used to count the instances. This way that variable is shared between all the instances of your application, and you can use the Interlocked Variable Access[^] functions to safely access the variable.
See also data_seg (C/C++)[^] and /SECTION[^] for more details on how this code works.
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hi all,
i have an application which requires to monitor USB activities(only USB mass storage devices).
i need a small help on how to differentiate between USB mass storage devices and USB Mouse/Keyboard/Printer (USB HUMAN INTERFACE DEVICES) etc...
could it be done through device ID??
some code will help a great deal...
Thank You all.
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In USB terminology, an interface is what we normally would call a device.
For example, a printer can have a scanner and mass storage in a single unit.
Each interface has a property called an interface class.
For mass storage, this property will have a value of 8.
You can see a list here - http://www.usb.org/developers/defined_class[^]
You can get this by reading the configuration descriptor of the device.
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Hi _Superman_,
i already know the device descriptor properties...
however, if i could get some code help it would be great....code on how to enumerate the base class of a USB device....
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The interface class is one of the fields in the interface descriptor.
The field name is bInterfaceClass.
So after you get the interface descriptor, check if bInterfaceClass is 8 for Mass Storage.
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Hi all
I have question about Sleep Function.If i use Sleep function and set sleep values 30mins. But After 10mins i want to change Sleep values like 1mins or 2min.
Is it possible.Please advice me.
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Yes, it is possible: just set the Sleep interval to 1 minute (or whatever appropriate) and iterate it 30 times, then, whenever you need to shorten the wait delay, decrease the iteration limit.
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.
This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke
[My articles]
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But if you give sleep 1 hour, then what happen?
I think it is not possible or we need to interrupt hardware.
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Well, you may use WaitForSingleObject instead.
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.
This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke
[My articles]
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OK,but How we stop sleep function? as we already put sleep for 1 hour.
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You cannot stop it (well, without a hammer...).
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.
This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke
[My articles]
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On the other hand, if you have to use a sleep of 30 minutes, it is likely that your design could be improved. For what reason do you need to sleep so long ?
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What you are looking for is a WakeUp function. Unfortunately it doesn't exist. Since your thread is effectively blocked on Sleep, you need to handle this differently. This article [^] may give you some idea of how to accomplish what you are looking for.
Chris Meech
I am Canadian. [heard in a local bar]
In theory there is no difference between theory and practice. In practice there is. [Yogi Berra]
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You say you want to sleep for 30 minutes but might at a later stage decide to alter the duration. This begs the following question: Who is doing the deciding? If you've called Sleep[^] with the full duration it obviously can't be the calling thread because it's sleeping. Some possible solutions are:
- Sleep for a shorter duration and periodically check on the same thread (do this in a loop).
- Use the WaitForSingleObject[^] function with the
dwMilliseconds parameter set to 30 minutes and for the hHandle parameter use a synchronisation object signalled by another thread (to abort the sleep).
Steve
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