C / C++ / MFC

ok! thanks

hi, have you resolve the problem?

It doesn't work like that. There are plenty of sites where you can hire someone to do your work for you. This is not one of them. We're happy to help with specific problems in code you have written. But this is not a "do my work for me" or a "convert this code for me" type of site. "These people looked deep within my soul and assigned me a number based on the order in which I joined." - Homer

PaulS_UK wrote: how do you attempt serious debugging in complex C++ code within your MyDLL.dll functions Any language - I use logging. Last time I did C++ I rolled my own. But googling I see Log4cxx and Log4cpp. I might go with the second but I would do more research first.

I am not sure what you mean by "use a textbox to open a file", but all you need is the actual path to the file. There is example C++/CLI code at File.Open Method (System.IO) | Microsoft Learn[^].

I'm sorry, my answer was a quick guess. That's why I put a question mark after it. Truth is I'm not sure. The difficult we do right away... ...the impossible takes slightly longer.

honey the codewitch wrote: hardware mapping of a C++ based device controller. Sounds good. But I don't want some mid-level developer that just discovered templates and databases to decide that he/she is going to improve the world by creating templates that encapsulate everything in the database layer.

etechX2 wrote: Maybe the AfxRegisterWndClass is set to release class automatically at the end when library exits. ? 1. Please read the Microsoft documentation about AfxRegisterWndClass; 2. Why are you trying to unregister and then reregister already registered Class? just save its name and then use it again!

There is a time and a place for it, and it's sometimes useful when doing some heavy Generic Programming. Like, in theory if you had to design your own tuple type (I know std already has one, but ignoring that), the function to access a tuple's value might be an auto because it's difficult to even type out the template instantiation necessary for the return type, much less come up with it. Another place I use it: In my graphics library you can define pixels with an arbitrary memory footprint. Different amounts of bits for different channels, like RGB565 or YUV888 etc. Because of the arbitrary nature of it the integer values for each channel may be a different type. For example, while a channel probably won't be more than a uint8_t can hold (8-bits) it might be (12 bits? uint16_t would be necessary) Because of that, when I go to assign values from arbitrary pixel formats I don't actually *know* what type it is, other than some kind of integer of 64 bits or less (based on static_assert constraints). So I could always promote it to a uint64_t but that creates other problems when you have to cast down again. So auto is what's for dinner. Check out my IoT graphics library here: https://honeythecodewitch.com/gfx And my IoT UI/User Experience library here: https://honeythecodewitch.com/uix

Try std::multimap. It does exactly what you want. Freedom is the freedom to say that two plus two make four. If that is granted, all else follows. -- 6079 Smith W.

I explained what you should do to correct this in my previous reply. Passing a class pointer or reference is just the same as passing any other type. So a simple example: // a useless class class Foo { private : int bar; public: Foo(int i) : bar(i) {} // constructor takes a value int getBar() {return bar; } // this method returns the value }; // an arbitrary function which accepts a Foo* int MyFunc(Foo* param) { int rc = param->getBar(); // ask the class object for the value return rc * 2; // and return it doubled } int main { Foo* pFoo = new Foo(4); // create a new object with a value of 4 int ans = MyFunc(pFoo); // call MyFunc passing it the pointer to the class object cout << "result: " << ans << endl; return 0; } And all of that, and more, is fully explained in any C++ reference, either online or in printed copy.

Thank you for your constructive contribution to this discussion. Appreciate your input and now I have a better understanding of the process.

Thanks for reply. I have riposted this, hoping for help with constructing with C++ reg expression .

error: declaration of anonymous class must be a definition and do not known how and where to correct this error. STAND BY I have another fish to fry and I need to rebuild this task from scratch. I took a wrong approach and that is why I got this error.

Ah memory leaks (and small buffer overruns). I would point out that your example is fairly obvious. If you have a long running task, and this code is in some sort of processing loop, you'll see it quickly. What will really bite you in the a$$ are the small leaks. A byte here, a byte there. I live in the embedded world where customers forget our equipment was installed under their production line 10 years ago. The engineer responsible either died, retired or moved on to another company. I'm not being morbid, I have stories I could tell you :) The group I work in is a decent group of smart people. Sadly, they never let us into the field to see how the product is actually used. The few times I've seen examples, they always shock me with "I didn't see that coming" sort of response. What amazes me is that if your customer never turns off your machine, why not set up an area where a test unit runs forever? I guess it falls under diminishing returns. Charlie Gilley “They who can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety.” BF, 1759 Has never been more appropriate.

lol, true. But going into the mfc afx, etc header files where "those people" took macros to an art form (I'm being generous) is tedious. Charlie Gilley “They who can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety.” BF, 1759 Has never been more appropriate.

You are welcome. "In testa che avete, Signor di Ceprano?" -- Rigoletto

yeah, you are going to be down into device drivers and what not. I'm sure Microsoft has an API somewhere, but it'll change. Charlie Gilley “They who can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety.” BF, 1759 Has never been more appropriate.