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Run chkinf on your inf file, it is part of the DDK/WDK.
It will tell you about missing sections and so on.
However, all you need for a simple driver is a services registry entry. Of course if it interact with the network stack you need a lot more, but for a basic driver a simle reg script might suffice.
--edit--
Oh yes, and here is another example of why Maunder should create a specific Kernel forum on CP. This sort of question, as well as the recent windbg ones, are NOT C/C++ and are NOT Hardware and Devices relevant.
==============================
Nothing to say.
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Thanks Eric for the reply.
There is no installation/driver forum on CP and since I had a C++ application along with a driver I put query in C++ forum.
Apologize me for that.
I had used chkinf and it gave me no error:
NTLOG REPORT--------------
Total Lines: 36 |
Total Errors: 0 |
Total Warnings: 3 |
--------------------------
Line 0: WARNING: (W22.1.2212) No Copyright information found.
Line 3: WARNING: (W22.1.2215) Class RKP_LTO_DEMO_DD (ClassGUID {03E9C4D5-178E-4684-B407-A3E103D71CE9}) is unrecognized.
Line 3: WARNING: (W22.1.2203) Custom defined Classes should have a [ClassInstall32] section.
But since this is a simple inf file to just copy files and create registry entry I doubt we need more sections.
Any idea where exactly I am missing?
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Dont apologise. I have been on to Maunder for a while to create a kernel forum. 
First, eliminate the warnings. Tfhis is the kernel here, we accept nothing but 100% perfection. (And seriously, I mean that. It is either 100% or it is crap. Nothing in betweem.)
So, ewhen the inf checks out OK and rins you need to check the services key to make sure the driver is there. If not, the inf failed in some way. Look at setupapi.log file, it will tell you about inf based installs.
If the services entry is there, we need to look at signing, turn off driver signing checking, else the system wont load it.
Slight aside here, drivier signing checking on 64 Vista+. Originally you couldnt load unsigned drivers, then the driver dev world got pissed of with MS, and they changed it, but you have to be booted in debug mode (last I heard, but it is possible they changed it on later OSs. Check on google).
It coule be your driver is loading, but failing driver entry. So, after it loads (supposedly), do a sc query <driver service="" name=""> and see if it says running.
If not, it is time to hook up windbg and set a breakpiont on your driver driverentry. bp <drivername>!driverentry
Load it, and it should break. (set the symbols up.) Then you can see if it is failing in driverentry. If it suceeds driverentry, your driver IS running.
If your service entry is there, but driverentry isnt getting hit, then you need to make sure it is compiled properly, it needs a check sum, so make sure you use the ddk build utility.
Yep, its PITA, but thats why I get paid so damn much!
==============================
Nothing to say.
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Hello I was reading on how smart pointers allow the C++ language to have the functionality of a garbage collector, but I wanted to know what are the cons or not to dos on using smart pointers.
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If you have reference counted smart pointers their storage can last beyond the scope of the original variable and lead to some confusing code.
But they are usefull. You dont need to trap every exit point from the code the smart pointer is declared in since its destructor, called automatically when it goes out of scope, frees any allocated memory for you.
Of course, for a purist, one might like to manage your memory yourself, and consider smart pointers as lazy.
==============================
Nothing to say.
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I was wondering if there was an easy way to convert the following line to a format that shortens the number and adds a suffix of KB, MB, GB.
Or if I need to write my own function to do the calculations.
swprintf_s( szFileSize, 24, L"%ld", filesize.QuadPart );
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I don't think there's any function that's already made for the task, though it is very simple - a couple of lines in fact.
Here's some code I have in an app:
case WM_FILE_DOWNLOAD_PROGRESS_AVAILABLE:
progHdr = (downloadHeader_t*)lParam;
if (progHdr->bComplete)
sprintf(buffer, "Complete");
else
{
if (progHdr->contentLen > 1024*1024)
sprintf(buffer, "%.2f MB", (float)progHdr->contentLen / (1024*1024) );
else if (progHdr->contentLen > 1024)
sprintf(buffer, "%.1f KB", (float)progHdr->contentLen / (1024) );
else
sprintf(buffer, "%d B", progHdr->contentLen);
}
setListViewItemDownloaded(listWnd, (int)progHdr->lParam, buffer);
return true;
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Technically, if you follow the international standards, you are converting to "KiB", "MiB", or "GiB", which are the binary (base 2/1024) numbers. "Kilo" is reserved to the traditional Metric System usage. Computer people have just usurped and altered its usage. Good luck getting people to change though
Wikipedia article[^]
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Yeah, yeah - go through that rubbish most times I buy a new storage device. Of course a manufacturer that uses 1000 bytes to mean a KB is providing less than the box makes me think I'll receive.
Anyhow, the debate is a total non-starter as far as I'm concerned.
Why?
I'm interested in the numbers reported being consistent with the OS.
Windows uses 1024 bytes = 1 KB, and so do I - simple!
EDIT: Though thanks for pointing that out. I'd intended to, but forgot. 
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Sorry I took so long, went to Vegas this weekend.
Thanks for the good idea's, Wrote this real quick, but the compiler is complaining about the * in GB saying integral constant overflow. I'll look it up fix it.
I went with the non-correct naming format, don't want to confuse anyone with the correct format.
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Besides the other comment you might want to consider carefully exactly what your target audience considers a 'KB', 'MB' and 'GB' to be. Might be binary. Might be decimal.
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Hello,
I've been asked to help create a pretty GUI, and have a jpg to work with. Unfortunately I'm not generally a GUI developer, so have no idea if this is a standard problem or not.
Has anyone tackled a similar problem in the past, converting a typical win 95 style interface into a sleek and stylish iPhone style interface, in MFC?
I expect the easiest way will be to set the JPG as the window background, then shift things around and change graphics objects until they look the same.
Does anyone have any advice they can give me, or reading material that might be useful?
Thank you!
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Codling2020 wrote: reading material that might be useful
Take a look in the articles section here on CodeProject; there are lots of useful samples.
Unrequited desire is character building. OriginalGriff
I'm sitting here giving you a standing ovation - Len Goodman
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CDHtmlDialog[^]. There are many articles on how to use it, here on code project
With the addition of HTML and javascript you can do a great GUI, though it is also possible with Qt library, if you wish to use it.
You talk about Being HUMAN. I have it in my name
AnsHUMAN
modified 16-Mar-12 0:54am.
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Hey,
I am searching for some small c++ projects with documentation . can some one help? , where i can find such projects. My programming level is not very good.I know all the functions and syntax use in c++, now i want to look some small projects with documentation.
thank you
johan
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My advice is: read some C++ tutorials (or better a good book) first.
You may find many many open source projects on the web.
You may also have a look at Microsoft Visual C++ code samples[^].
Veni, vidi, vici.
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Hi,
I am reading the following code example returning char* from function:
http://www.java2s.com/Tutorial/Cpp/0140__Function/Returnapointerfromafunction.htm
How is that safe? Should the returned pointer not be invalid when the function goes out of scope? I keep reading from everywhere that it is not safe to do that.
Also, this works for me:
const char* Convert(int val)
{
std::stringstream ss;
ss << val;
return ss.str().c_str();
}
Could someone explain?
Thanks
modified 15-Mar-12 9:51am.
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Dont know much about the std::stringstream but I would have thought the buffer used for storage, ahose first member is returned by c_str() should go out of scope when the funtion returns although reference counting can change this of course.
==============================
Nothing to say.
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Gday.
Looking at the tute you've linked to, one can see that yes indeed! A pointer is returned from a function. However, we can also see that the memory that is pointed to by this pointer is actually owned by main. - in so far as they are const char* strings.
I'm dubious about this example, since string constants are used. Had "three" & "one two three four" been assigned to variables, I'd be a lot happier about what I thought the compiler may do with them - as it stands, my understanding is that the compiler is free to do with these _temporary_ string constants as it pleases once they've been used. (once the function has been called)
You example, on the other hand - that does exhibit the problem you spoke of. As soon as the Convert function returns, the ss variable goes out of scope. At the same time, it loses ownership of the memory that it put a copy of the string into. While you still have a pointer to this memory, the ss object no longer owns it.
You should be able to demonstrate this quite easily.
1) assign the return value of the function to a variable
2) do a whole bunch of stuff involving memory allocation/deallocation
3) now try to print the string that you got earlier and stored a pointer to.
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elelont2 wrote: I am reading the following code example returning char* from function:
http://www.java2s.com/Tutorial/Cpp/0140__Function/Returnapointerfromafunction.htm
Here the scope of the variable (that is the string) is controlled by the caller.
In your code the scope of the string is NOT controlled by the caller, it ends when the function exits. Hence your function cannot work.
Veni, vidi, vici.
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Thanks for whe replies.
So it is not even safe to return ss.str() since stringstream goes out of scope?
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elelont2 wrote: So it is not even safe to return ss.str() since stringstream goes out of scope?
That would be safe, since the return value would be a copy of the string object. Of course, to make it working you should accordingly change the function signature:
string Convert(int val)
{
}
BTW the original function is not unsafe, is wrong.
Veni, vidi, vici.
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CPallini wrote: since the return value would be a copy of the string object.
Ever wondered why C++ can be so heavy on the stack?
What he can do of course is pass a SS as a pinter to the func, which allocates enough storage, does its thing, and returns success or fail. Then the caller can free the storage when it has to.
This uses a much less stack than putting an entire SS object on it.
==============================
Nothing to say.
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Erudite_Eric wrote: Ever wondered why C++ can be so heavy on the stack?
Yes, I know. However the code would be correct (in may opinion correct code id much better than wrong one  ).
Erudite_Eric wrote: What he can do of course is pass a SS as a pinter to the func, which allocates enough storage, does its thing, and returns success or fail. Then the caller can free the storage when it has to.
Passing a reference it is usually better.
In any case, now C++ has the move semantics[^].
Veni, vidi, vici.
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