I need some clarification on one point. We normally use static variables in C/C++. We say when we have used a static variable inside a function, it persists its previous value when that function is called again & again, e:g: to say, static variable retains its last value when that function is called again.
Can anybody explaing me the logic behind this. How a static variable knows its last value and how it is not initialized everytime on the function call.
Because a static variable, even when declared in side a func, is created in the DATA section of a programs run space. Think of it like a global static variable that gets initialised to zero and whose value is of course persistent.
An ordinary variable declared inside a func is created on the stack. This of course winds back and forwards so when the func returns the space that variable used is lost to the next func you call.
I am in over my head again. I am getting error C2664 and I did read the Tech note ( something about ANSI improvement) about it and frankly I just do not understand what is the problem and <b>how to fix it in VC6.0.</b>
Do I have to redefine the GUID_DEVCLASS_COMPUTER?
The parameter GUID is defined in both functions as “const GUID*”
The API fails with this error C2664 and C_GetClassImgIndex compiles OK
error C2664: 'SetupDiGetClassImageIndex' : cannot convert parameter 2 from 'const struct _GUID *' to 'struct _GUID *' Conversion loses qualifiers
Fails b = SetupDiGetClassImageIndex(&m_imgList, &GUID_DEVCLASS_COMPUTER, &nRootImg);
OK int n = C_GetClassImgIndex(&GUID_DEVCLASS_COMPUTER);
Any help would be greatly appreciated. Cheers Vaclav
I tried to port the fork API in Linux to Windows (Windows 7 and Windows 8) using the native API RtlCloneUserProcess as discussed in the following link.
With the RtlCloneUserProcess function, child process is created, but didn’t get the console handle, stdin, stdout etc. The solution is to inform the CSR /win32 subsystem about the new process. But I could not able to do that. Please help me to re link the child process to the CSR.
I didn't think about using a typedef. I understand how to use in-line assembly, but without the typedef, trying to do
fld tbyte ptr var
Thank you for the answer.
I have re-written ENT in MASM to try to speed it up for huge files. I first modified ENT to handle the huge files, but it was terribly slow (for my 16 GB file). It took 32 minutes to process. I have cut that down to 10 minutes with my entmasm, and I am trying to validate the calculations by using printf statements in both to display all of the calculation inputs and outputs (for a VERY SHORT 10 BYTE file), but in the entropy calculations, the results do not quite match. The C compiler (visual Studio 2008) is optimizing the code and keeps most of the intermediate results on the FPU stack in temporary real format. My masm code was pretty brutal and kept each calculation separate, saving results in memory. I was using doubles (real8) for storage, and I think that the loss of precision when saving an FPU value as a real8 is what caused the result differences. I will convert my masm code to use tbytes and modify the ENT C code to do the same, and see if that makes the results match.
One other question. ENT has several 256 entry arrays for the counts and probabilities. If I change these arrays of 256 tbytes (10 BYTES each), will the mod 16 mis-alighment cause performance problems? Would it be better to make them arrays of owords (16 BYTES) and just index by 16 instead of by 10? I am not worried about the extra memory, I have GIGA BYTES of unused memory.
I have already implemented the DQWORD arrays for my MASM version, and am adding printf statements of intermediate calculations. The change to use TBYTES did fix the differences I had seen in the calculated ENT value between the C version and my MASM version. This was not as simple as it looked to be at first. The only FPU instructions than can use TBYTES are FLD and FST. You cannot use FADD TBYTE PTR [i], but I can see where the xxxP FPU instructions come from:
It turns out that this is exactly what the FPU needs to do for an faddd val - it must push the stack, load the double/float/integer into st0 and convert it to temporary real, then add/sub/mul/div ST(1) by ST(0) and put the result into ST(1), then pop the stack leaving the result in ST(0). With TBYTES you just have to do it manually, - BUT - The FPU doesn't have to do any conversions - the TBYTE is already in temporary real format and can contain a signed QWORD (63 bits, + sign). Unfortunately, the FPU cannot handle unsigned 64 bit values (they end up as negative values).
The biggest improvement I got was changing from fgetc for each character to reading 65536 bytes into a buffer (with no system buffering) and indexing through the BYTES, then reading more from the file into the buffer and processing. Another interesting change was to fill the buffer, initialize one time for the FIRST character, then skip to process the characters, skipping around the subsequent re-fill buffer entry point. So little extra code, BUT, avoided checking if this was the first character 16 billion times as was done in ENT. Another speedup was to fragment the character occurrence buffer - I had to grow the collection bins to a QWORD for supporting a max file (2^63 BYTES), but in the BIT mode this increased the count to 2^66. I had to accumulate the counts in three DWORDS in a DQWORD, using "add value, adc 0, adc 0," but this occurred (in my 16 GB test) 16 billion times. With a smaller buffer that could contain the counts in a DWORD, it was just an "add value" for the buffer count, then 256 iterations of "add value, adc 0, adc 0," to accumulate the 256 occurrence values in the DQWORD array and clear the DWORD counts between buffer fills. Also for checking whether a bin had any count at all (several places in ENT checked this), I accumulated (at the end of the file processing) the 3 DWORDS for each entry into the fourth DWORD that could be tested with a single instruction.
But I digress from a simple C question into something more appropriate for Algorithms.
Hello Im currently doing a project in Visual Studio 2010 where I need to create a bank account with 5 tabs. on the first tab the user is to put their info in (name addres etc) and the balance they wish to deposit. The deposit cant be a negative number and the starting deposit "will be passed to the createAccount method" as stated in project outline. Im really lost in this class and dont know exactly how to do this. Im guessing it needs to have a method created for it because the balance can be adjusted with the withdrawls and deposits that can be made after the account is created and the deposits and withdrawls also need a method because the with draw will reduce the users balance in the "accountInto array" Im really really lost and if anyone can give me any guidance I would appreciate it!
You seem to be starting at the wrong place for this question. Start by thinking about what information you need to maintain in your class and what operations you need to perform during its lifetime. Take a look at this documentation[^], or if you have a decent reference manual handy, go to the classes section in there.
One of these days I'm going to think of a really clever signature.
You are so helplessly lost. You really need to start from basics and ask a specific TECHNICAL question, not some vague 'help me do my project for me' type question.
You want 'bank account method' help? Tell me, where is 'bank account' on a VS menu? DOes it exist? Do you want VS to think for you?
Here is some advise. Either give up programming or go back to square one and think, think REALLY carefully about what you want to achieve. Then come back and ask a question when you have one that is fully formed. (Oh, and when you have got a question FULLY formed that is worthy of asking, it will suggest its own solution.)
Sorry for being such a c*^t, but I am an arrogant bastard who has been programming all kind of complex stuff for so long I can not bear the ignorance that laziness brings.
WM_DEVICECHANGE sets wParam to DBT_DEVNODES_CHANGED to update list (tree?) nodes. No other info is available then. I have not retrieved any device list, so it is useless for me.
To receive DBT_DEVICEARRIVAL it is necessary to first use RegisterDeviceNotification.
At this point no other help is required. Thanks Vaclav
I need some help / hints with implementing WM_DEVICECHANGE in MFC Document /View setup. I have managed to intercept the WM_DEVICECHANGE in CmainFrame message map and process it . The problem m is that the wParam is nowhere near the 0x8xxx, but it is plain “7” and the lParam is 0.
I went thru the Dbt.h and cannot figure out what is the wParam = 7 telling me.
Here is the code snippet and if it is not formatted to you liking – I am sorry , but I write my stuff in OpenOffice and than copy it to CodeProject so it cannot be formatted properly.
<b>I just need some troubleshooting pointer / suggestion how to analyze these mysterious parameters. </b>
Maybe CmainFRame is not the place to start, but I got same parameters values when I used Cdialog message map directly.
Addendum JUst found this info, so the additional question is - is CMainFrame "top window" and if not will RegisterDeviceNotification solve this ? I shall try it next.
The DBT_DEVICEARRIVAL and DBT_DEVICEREMOVECOMPLETE events are automatically broadcast to all top-level windows for port devices. Therefore, it is not necessary to call RegisterDeviceNotification for ports, and the function fails if the dbch_devicetype member is DBT_DEVTYP_PORT.
Your code and text can be formatted properly. It must be done manually after pasting (it does not care if pasting from OpenOffice or a plain text editor but you should remove HTML tags when pasting from Ooo). Select text with mouse and use the buttons above the edit window to apply specific formatting. If you know HTML, you may also type the HTML tags. Check the preview to see how it looks.
Thank you, obviously I have not look all the way to the end of the page!
However, what the dickens is " ring3 people" note talking about? So when "new node is detected / chaged" is not same as
DBT_DEVICEARRIVAL A device has been inserted and is now available.
Mr MS - I am not sure this note is in English!
and to get the device more work is necessary??? I am not sure I can figure that out, getting tired of this USB mess.
/* * Message = WM_DEVICECHANGE * wParam = DBT_DEVNODES_CHANGED * lParam = 0 * * send when configmg finished a process tree batch. Some devnodes * may have been added or removed. This is used by ring3 people which * need to be refreshed whenever any devnode changed occur (like * device manager). People specific to certain devices should use * DBT_DEVICE* instead. */ #define DBT_DEVNODES_CHANGED 0x0007
i have a appilcation consists of thousands lines of code. when i do some specific operation, i.e. open a very large document, the app almost eats up my memory. but after a while, the memory is given back. i have tested the codes and found no memory leak.
so, my problem is how to find the codes who eat up my memory.
any one can help me?
First, when you do a malloc or new, you extend the heap. For optimization reasons, the memory manager may not return the heap back to the OS immediately. When needing to allocate especially large chunks of memory, you can use a low level API directly or, with some compilers/CRTs, a different heap (for Windows, here's an article discussion various options: http://msdn.microsoft.com/en-us/library/windows/desktop/aa366533%28v=vs.85%29.aspx[^].)
Also note that if you allocate memory and sit around, the OS may page it out. To understand the difference in Windows, look into "private bytes" and "working set".
I want to ask you something: what would you use for image processing and more important, convert images from an format to other ? I am using MFC, and I was thinking of GDI+, but I didn't find so many examples to how to convert images ...
I see here so interesting controls, CBitmapEx, CxImage, CImageStone, but I don't know what is proper to do the job ... I will appreciate any hint.
No, I didn't look over by now ... Thank you for your interest, so you suggest to use GDI+ ... I didn't try to load some not common image file, .raw, .tiff multipage, etc. ... I don't know if does function ...
No, I just asked if you had looked at that function and if it solved your problem. Your question is not particularly clear, i.e. what do you want to convert from, and what do you want to convert to? I am sure that Google could find you lots of information if you were more specific about your requirements.
One of these days I'm going to think of a really clever signature.