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General C++ Programming - January 2022 (Page 2)

Casts

In this code-snipped class B { public: virtual void Test(){} }; class D : public B { void Test(); void print(std:: string st) { std::cout<<st<<'\n; }; void ...

[2 replies] Last: One should also ask if the use of a cast is necessary: it may not be, ... (by TheIdeasMan)

by Cplusc

map

hello I have two vectors, a {1,4,8,3,6,9} and b{ 0,1,2,3,4,5}. For accessing the 5th element inside vector a, instead of a I want to use b which corresponds ...

[4 replies] Last: Thanks for your answer. Actually I thought about this as well, but I'm... (by Cplusc)

by frek

Pointers to classes and casts

Here: class B { public: virtual void Test(){} }; class D : public B {}; void f(B* pb) { D* pd1 = dynamic_cast<D*>(pb); D* pd2 = static_cast<D*>(pb);...

[12 replies] Last: Thank you. I try to form a new thread for the latter question to get t... (by frek)

by azalien

Help with multi dimensional arrays!

Hello! Could come help me get started with this program? Write a program using a multi-dimensional array that allows the user to enter payroll data for a bus...

[4 replies] Last: I have been trying to start this assignment for a bit, and just cant ... (by seeplus)

by Hawlong

encrypt and decrypt pointer

Hello , How to encrypt and decrypt pointer [ 99DE27 ] And save the result in ini file

[18 replies] Last: Thank you all for your help Thank you Ganado (by Hawlong)

by frek

Get started learning Embedded programming in C++

Gus, I have a general question about embedded. I'm a C++ programmer and would like to start learning embedded programming using C++. I've searched much to find ...

[1 reply] : While I haven't toyed with arduino or anything smaller than a raspi, I... (by newbieg)

by salem c

Can Someone Help Me Find Error in This Program?

<edit>OP deleted their post and ran away. USAFrenzy rescued the mess and it's posted below in message https://www.cplusplus.com/forum/general/281826/#msg121957...

[9 replies] Last: I'm impressed that you found it. Thanks. I chose a distinctive look... (by mbozzi)

by Shubham2000

Can someone explain me this unexpected output?

I was trying to handle different line-ending. But as I expected the output was different than expected. test4utf8mac.srt is a subtitle file of SubRip format h...

[3 replies] Last: You could evaluate this at compile time without "macro-fying" things b... (by USAFrenzy)

by Shubham2000

How to read file having different line ending in Cpp

I have two files "linuxUTF8.srt" and "macANSI.srt". I am reading these files using getline(). as macANSI.srt has '\r' as line ending I am reading the whole file...

[5 replies] Last: Read the whole file into a string. Then find the first occurrence in t... (by seeplus)

by Cambalinho

how convert GDIplus::color to colorref?

how convert GDIplus::color to colorref? point Point=PixelLine ; Color *color; img->GetPixel(PosY,PosX,color); ...

[2 replies] Last: thank you so much for all.. works fine (by Cambalinho)

by leo2008

string handling

I am trying to resolve the below string manipulation. But code doesn't work as expected. Need help with some inputs. Input First line of input contains string...

[8 replies] Last: Right! I don’t know what I was thinking – I was probably already s... (by Enoizat)

by salem c

How to capture the screen of a window that contains transparency?

Cross-posted https://docs.microsoft.com/en-us/answers/questions/702376/how-to-capture-the-screen-of-a-window-that-contain.html https://stackoverflow.com/questio...

[1 reply] : Also asked and answer given at https://forums.codeguru.com/showthread.... (by seeplus)

by Cambalinho

GDIPLUS: using Graphics, can i get HDC?

using Graphics, can i get HDC?

[15 replies] Last: Yes, I would think that BitBlt(...) is only reliable within the paint ... (by coder777)

by Ocelotter

Issues regarding Menu

Hello, I have to make a menu, 1. compress Text that will give allow you to input a value that will appear in 2. Extract Text. The problem is that it outputs th...

[12 replies] Last: what I would do is get a statistical breakdown of english and assign t... (by jonnin)

by frek

General rule on inheritance

Will you please explain this general rule: “a D is a B” does not imply “a Container<D> is a Container<B>” with some simple example to be easily unders...

[12 replies] Last: Thanks for your time. patience, and help. :) (by frek)

by JUANDENT

temporary objects get destroyed and corrupt program

I believe the following code has a bug related to temporary objects getting destroyed leaving dangling references... however I don't know how to find this in th...

[4 replies] Last: That's it!! Not quite. Having references as member variables are alwa... (by coder777)

by hello128882

iterating over a static std::vector

So I have a static std::vector like this: static std::vector<ApiWrapper> api_handlers = { Rtl::RtlDuplicateUnicodeString, Rtl::RtlInitUnicodeString, ...

[8 replies] Last: Could be SIOF https://en.cppreference.com/w/cpp/language/siof (by mbozzi)

by mencecpp

Assignment operator bottlenecking simulation

I am running a Monte Carlo simulation of a polymer. The entire configuration of the current state of the system is given by the object called Grid . This is my...

[15 replies] Last: maybe instead of G = std::move(G_), the easiest thing to do might be ... (by seeplus)

by frek

Change C code to C++ in an embedded project

The following C code is in the main.c file of an embedded project on STM32CubeIDE. /* USER CODE END Header */ /* Includes --------------------------------...

[9 replies] Last: Thank you very much salem c . Your remark is right and worked. First... (by frek)

by ForgottenLaw

For Loops in an Array Comprehension Help

Hi guys, I encountered this problem while I was tackling loops in an array. Can someone help me by explaining to me how do I get the number 1 in the output? Bec...

[1 reply] : So without the 2nd a++ at line 21, you do understand why you see 1 ... (by salem c)

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