Re: hot to resolve such redefined type errors? - C / C++ / MFC Discussion Boards

Re: hot to resolve such redefined type errors?

Nelek16-Dec-07 22:45

Nelek

16-Dec-07 22:45

what about the preprocessor #ifdef, #ifndef or #pragma? Do they help?

Greetings.
--------
M.D.V. Wink | ;)

If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?
Help me to understand what I'm saying, and I'll explain it better to you
“The First Rule of Program Optimization: Don't do it. The Second Rule of Program Optimization (for experts only!): Don't do it yet.” - Michael A. Jackson

Re: hot to resolve such redefined type errors?

toxcct16-Dec-07 23:00

toxcct

16-Dec-07 23:00

Nelek wrote:
what about the preprocessor #ifdef, #ifndef or #pragma? Do they help?

i don't think they will. in fact, i hope files from microsoft SDKs like wdm.h or ntddk.h already have such inclusion securities...

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Re: hot to resolve such redefined type errors?

Naveen16-Dec-07 23:14

Naveen

16-Dec-07 23:14

You cannot include the ntddk.h in an application with the windows.h. so the only turn around is to copy the function definition from the ntddk.h and paste in one for your local file.

nave

[OpenedFileFinder]

Re: hot to resolve such redefined type errors?

toxcct17-Dec-07 0:15

toxcct

17-Dec-07 0:15

Hi Naveen,

Naveen wrote:
so the only turn around is to copy the function definition from the ntddk.h and paste in one for your local file.

that's bad. where will he find the implementation of the function then ?

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Re: hot to resolve such redefined type errors?

Naveen17-Dec-07 0:24

Naveen

17-Dec-07 0:24

toxcct wrote:
that's bad.

But thats the only way. You might be aware that that function are implemeted in the ntdll.dll. But Platform SDK or visual c++ dosent offer a ntdll.lib file so that he can staticaly link his application to ntdll.dll. So only chance is to load that dll dynamically and call those function.

nave

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Re: hot to resolve such redefined type errors?

Sarath C17-Dec-07 1:19

Sarath C

17-Dec-07 1:19

Have you tried your luck with ntifs.h ?

-Sarath.
"Great hopes make everything great possible" - Benjamin Franklin

My blog - Sharing My Thoughts, An Article - Understanding Statepattern

Re: hot to resolve such redefined type errors?

JudyL_MD17-Dec-07 1:49

JudyL_MD

17-Dec-07 1:49

kcynic wrote:
wdm.h or ntddk.h

You can't include those in normal user-mode programs. They are strictly for kernel-mode or native-mode programs.

Judy

Re: hot to resolve such redefined type errors?

kcynic17-Dec-07 14:51

kcynic

17-Dec-07 14:51

Perhaps that is true.But I really what read some information from my USB device.My two task are these:

1.When I scan a USB device plugged,I want to get its driver letter like G,H,and so on.For example,i get a device instance like "USB\VID_0AC8&PID_301B\5&37FD04DB&0&2" using SetupDiGetInterfaceDeviceDetail,so I using that path to create a HANDLE(using ZwOpenFile),then I want to call ZwQueryInformationFile() to get some information,or call ObReferenceObjectByHandle().But these functions are decleared in wdm.h or ntddk.h.

2.The document of my USB device(or storage)says that,the special information should be retrieve by SCSI INQUIRY,I find it is IOCTL_SCSI_GET_INQUIRY_DATA command.But I do not know how to do.

I will be very appreciated if someone give me some advice.
Thanks.

GOOD LUCK

Re: hot to resolve such redefined type errors?

JudyL_MD18-Dec-07 2:45

JudyL_MD

18-Dec-07 2:45

You can do this without using the functions from wdm and ntddk. After you get your device's name using the <code>SetupDi</code> functions, open a handle using <code>CreateFile</code>. Then use <code>DeviceIoControl</code> to send the IOCTL_SCSI_GET_INQUIRY_DATA to the device. Google on that IOCTL and you'll find some examples of calling it from user mode.

Judy

Random number

nitin316-Dec-07 22:20

nitin3

16-Dec-07 22:20

how to generate a random number within a range ( eg: between 5000 and 7500 ) ??

Thanks & Regards

Re: Random number

CPallini16-Dec-07 22:36

CPallini

16-Dec-07 22:36

Check out http://msdn2.microsoft.com/en-us/library/398ax69y(VS.80).aspx[^]

Have a look at sample code.

Smile | :)

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.

Re: Random number

Nelek16-Dec-07 22:43

Nelek

16-Dec-07 22:43

Make it for 0 to 2500 and then add 5000 :P

Greetings.
--------
M.D.V. Wink | ;)

But you can also...

CPallini16-Dec-07 22:50

CPallini

16-Dec-07 22:50

... just call rand() and discard all numbers that happen to be out of range.
Big Grin | :-D

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.

Re: But you can also...

Nelek17-Dec-07 1:43

Nelek

17-Dec-07 1:43

Definitivelly, there is people that are blind and don't see the symbol of "joke" in the posts. I put a 5 to compensate the bad points.

Greetings.
--------
M.D.V. Wink | ;)

Re: But you can also...

CPallini17-Dec-07 2:11

CPallini

17-Dec-07 2:11

Nelek wrote:
Definitivelly, there is people that are blind and don't see the symbol of "joke" in the posts. I put a 5 to compensate the bad points.

Oh I don't care about bad votes of such people. Anyway, thank you very much I really appreciate you kindness.
Smile | :)

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.

Re: Random number

toxcct16-Dec-07 22:56

toxcct

16-Dec-07 22:56

(rand() % (UPPER_BOUND - LOWER_BOUND)) + LOWER_BOUND

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Re: Random number

CPallini16-Dec-07 23:08

CPallini

16-Dec-07 23:08

On statistical grounds (don't ask me why Big Grin | :-D

) the best ~~better~~ approach is instead the one provided by the MSDN sample http://msdn2.microsoft.com/en-us/library/398ax69y(VS.80).aspx[^], i.e.

int u = (double)rand() / (RAND_MAX + 1) * (range_max - range_min)
            + range_min;

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.

Stack Overflow - Urgent

krishnan.s16-Dec-07 22:15

krishnan.s

16-Dec-07 22:15

Hi All,
I have functions A & B.
A will be the starter. A will call B.
Again B will call A.
This call will go recursively until a condition is satisfied.
But after around 200 executions, if the condition is not getting satisfied, Stack overflow happens.
fn A{
......
call fn B
}
fb B{
......
call fn A
}
Is there any way to call function B after the complete execution of A is getting finished. So that the scope of A will be completed before calling Function B.
What if call PostMessage in this case?

Any help would be appreciated...
Thanks in advance.........

Re: Stack Overflow - Urgent

CPallini16-Dec-07 22:22

CPallini

16-Dec-07 22:22

krishnan.s wrote:
This call will go recursively until a condition is satisfied.
But after around 200 executions, if the condition is not getting satisfied, Stack overflow happens.

IMHO it is a bit too early, but anyway....

krishnan.s wrote:
Is there any way to call function B after the complete execution of A is getting finished. So that the scope of A will be completed before calling Function B.
What if call PostMessage in this case?

I think the question is: is the algo recursive?
If the answer is yes, then you can either try to increase stack size or transform the algo to do iteration instead of recursion.
If the answer is no, then you have to modify your buggy code.

Smile | :)

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.

Re: Stack Overflow - Urgent

Matthew Faithfull16-Dec-07 23:08

Matthew Faithfull

16-Dec-07 23:08

You may be able to prevent this problem by passing less data with each call, passing references instead, keeping your data in a heap allocated structure etc. These changes may be simpler than changing the algorithm. If you post a few more details, function signatures, some idea of the data structures involved as solution may present itself.

Nothing is exactly what it seems but everything with seems can be unpicked.

How to use iLBC codec

programmer8116-Dec-07 22:09

programmer81

16-Dec-07 22:09

Hi Everyone,

I need some help regarding implementation of iLBC codec for compressing audio files.

Thanks in advance..

regards,
programmer81

mfc dialog application problem

zengkun10016-Dec-07 21:58

zengkun100

16-Dec-07 21:58

This is a dialog based application. I want the application execute some code after the main window and all child windows displayed correctly. Where should I write the code ?
I think OnInitDialog is not a good place, because the window have not displayed yet.
Thank you all!

Re: mfc dialog application problem

CPallini16-Dec-07 22:12

CPallini

16-Dec-07 22:12

You can call PostMessage() inside OnInitDialog to post a user message, then in the message handler do needed stuff.
You can also use a one-shot timer for it.

Smile | :)

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.

Re: mfc dialog application problem

pierre_ribery16-Dec-07 22:37

pierre_ribery

16-Dec-07 22:37

Go for the PostMessage approach. Post it at the end of OnInitDialog.

Forget the timer approach. PostMessage is the correct way to do this.

Why?

CPallini16-Dec-07 22:47

CPallini

16-Dec-07 22:47

pierre_ribery wrote:
Forget the timer approach. PostMessage is the correct way to do this.

Why?

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.

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.