Comments by Dan page (Top 53 by date)

hi, thanks also actually there is another trick in the code. like: `memcpy(&obj,Variable[index].get_blob().data(sizeof(OtherCustomStruct )*i),sizeof(OtherCustomStruct ));` obj is again of type CustomStruct, however OtherCustomStruct is basically similar as CustomStruct just they differ on one element, OtherCustomStruct seems to be kind of subset of CustomStruct. And the copy is still working, seems it should be like that right?

ok, thanks

I don't mind, but which do you mean?
This: >>"convert all kinds of strings to array of bytes using UTF-8 Unicode encoding."?
Yes, but how? You mean use std:string with UTF-8? I am ok with it just could you explain bit more how/why that would work.

I am reading some links you gave me now.

like this?

ps. this is error2:

Error 2 error C2782: 'std::basic_istream<_Elem,_Traits> &std::getline(std::basic_istream<_Elem,_Traits> &,std::basic_string<_Elem,_Traits,_Alloc> &)' : template parameter '_Elem' is ambiguous c:\users\documents\visual studio 2012\projects\consoleapplication3\consoleapplication3\consoleapplication3.cpp 34 1 ConsoleApplication3

some other parts of code I managed to modify. I get two or three other errors to but they are same as I posted above, and at same lines.

I posted errors above, below nav3's comment

This is one error:

- (from operator <<) Error 1 error C2679: binary '<<' : no operator found which takes a right-hand operand of type 'const std::string' (or there is no acceptable conversion)

this is second:

- Error 5 error C2780: 'std::basic_istream<_Elem,_Traits> &std::getline(std::basic_istream<_Elem,_Traits> &&,std::basic_string<_Elem,_Traits,_Alloc> &,const _Elem)' : expects 3 arguments - 2 provided

The above one is related to getline

Hi, thanks although I got familiar myself with Unicode and encodings already (more or less). e.g., Unicode stores characters in certain format, called codepoint -- UTF 8 for example is encoding then which indicates how Unicode should be interpreted. but I'll look at your links, seems unicode support with c++ isn't trivial

It's not easy to fix those issues, that's the problem ...

>>"First of all, you can mix wstring and string (why not, in principle?)"
Hi, because if I declare one of my wstrings above as a string, I get compilation errors.

>>"convert all kinds of strings to array of bytes using UTF-8 Unicode encoding. "
Can you explain a bit more details on this how? and also bit more information on the second part of your first paragraph.

I think the one I showed is just for "Short Hands" because I can't see how the code I showed, enforces int to be 32 bits for example?

hey, what is meant with that it's "GNU specific?"

I might verify it Once - which does not mean that will happen always, that is why I asked.

I see, ok, thanks

ok, just I didn't test any of the solutions yet (suggested ones)

why will rethrown exception be caught by line 8 exception? as nv3 pointed out and as it seems to make sense, my first code snippet and second one are not related, e.g., they are not stacked. Due to handlers etc.

Are you sure this will let my "FIRST" catch(...) block (e.g. line 8), catch this exception? Check nv3's comment too.

Hi nv3 thanks, I think this is the main problem: "When the user later selects a menu item and Item1Handler is being executed, you are no longer in that try / catch(...) block"

Hi, Peter, can you elaborate a bit more?

a, ok you mean just use? Window->get_text();

Sure just I wanted to format it a bit before I display it

no, it's not MFC

it's there to retrieve value of amount entered by user on display

hmmm. I see. Now, it seemed strange to me. Imagine there is a class Settings. Now inside the Settings.cpp I see a declaration: (just after includes) Settings _settings; Then elsewhere in another class I see _settings.someFun() - directly being used.

Hi Andreas. Thanks. But please note MyDataStructure - is a "struct" it is not a Class. What to do in this case then?

Hi Sergey Alexandrovich Kryukov. Thanks. But I can't wait for the 1,2,3,4 stages. I need to get involved in doing this already now (what I posted). I can say that I have already average (maybe even above average) coding skills. What to say about the code I need to read. Just it is not documented. Some of its classes I understand relatively easily too. Some of them I still need to look at, just they use I think functions classes (maybe from some SDK) which I am not familiar with yet...

print you mean put it on the paper?

hi what do you mean with "print code pages?". No I can't debug it. As I mentioned the only way is possible to debug is to write to log files and then read those logs from the device.

Hi thanks. Yes, but as I said I have access to the *source code* of the project, so why do I need to reverse engineer it?

That's actually a problem: The code is written for an embedded device and you can't debug it. I think they just use logs for debugging.

yes, I 'll probably have unique names for each error (which also makes sense) and then return appropriate ones from different functions etc... thanks

what is the drawback of putting it outside the class?

Now I see output 13, I really don't know what was the problem last time. Maybe it was because I was running the program using Ctrl+F5? although I recompiled the source I remember. anyway it works now.

Yes but that way I may have to wait for the answer too long - and this question might not necessarily be specifically related to that article, that is why I posted it here.

ok, so far i found this material which seems Ok: http://www.codeproject.com/Articles/14746/Multithreading-Tutorial

Hi, thanks, Yes I also found this link: http://msdn.microsoft.com/en-us/library/vstudio/60k1461a.aspx, which I guess answers that.

Hy Brydon, I will try CppUnit - have some issues building Google test.

I am using Windows XP and Microsoft Visual Studio 10. Can you please tell me
- or maybe provide links - how to install/build/run Cppunit on my machine?

Thank you.

no :) check last comment of nv3 also.
ps. THis line: MyClass object2 = object1; will call the Copy Constructor.

Hi, meaning all the assumptions I had made in my comments (in the "code" section) in my initial post seem to be true.

No, I think that's not true :)

Hi, no not true in the first case object 2 does not exist so copy constructor should called.

Hi, thanks for your reply. What gets called in such a case? MyClass object2 = object1; I guess the copy constructor also?

i meant a deep copy

this is what I want to achieve(as mentioned also in my initial post): "Making a copy of object of my class and to use it in another thread must be safe"

Dear Matthew sorry, maybe I didn't highlight well enough: We don't want to achieve (1) actually - we may discard it, we just want to achieve (2).

hi Matthew thank you for an elaborate answer. My class has some get and also set methods, so anyone can read at any point in time. I could set locks (I use mutex btw) at the start of each Set function and unlock it at the end as you suggest (maybe do similar for Get-ers?). Just my confusion was, there are two situations it appears: (1) one to make some class thread safe in case many threads try to access the SAME object, and (2) make a copy of the instance of that class and usage of that copy in other thread should be safe. The (2)-nd issue is what I want to achieve and my problem was that I can not differentiate between the two, what do I need to do to achieve (2)? And why is it different from (1)??

Hi, thanks. What happens in such case, imagine in the constructor of car I added truck = new Truck(); But inside Truck class, I also have a member variable Wheel *wheel; - but I do not initialize it in the constructor of Truck (e.g., I don't do new and just assign a NULL to it for example). wheel in such a case will remain uninitialized right? e.g., no allocation will be done for it automatically..