We're developing plugins for a third party executable with a C++ API. There is no SDK available for the executable, and, worse, no debug version. The API uses at the very least std::vector and MFC CString which to my knowledge are not compatible...

C++17

VS2019

Best way to debug a C++ DLL in release mode

1 Aug 2021 by KarstenK

In this cases I like to write a log file with the debug texts and some error messages. Best is to check the amount of written data in some debug tests and only log errors and problems. Normally the problematic code areas are knows so concentrate...

C++17

VS2019

Best way to debug a C++ DLL in release mode

2 Aug 2021 by Greg Utas

Release builds have reached the point where the trade-off between performance and debugging is unacceptable. I'm using VS2017 and face the same problems. Here[^] are the compiler settings I use. They help, but it's still not as easy as a debug...

C++17

VS2019

Best way to debug a C++ DLL in release mode

2 Aug 2021 by Rick York

When I have done this I disabled optimizations in the release build of the library and enabled writing of the debug symbols file. I then set the hosting executable program for debugging the library to be the one in question and then set break...

C++17

VS2019

Best way to debug a C++ DLL in release mode

3 Aug 2021 by steveb

You can include debug information in the release build. It will behave as if it was debug build, i.e. stepping through code, breakpoints in code etc.

C++17

VS2019

C++ - Lightweight Parsing Command Line Arguments

19 Sep 2020 by Daniel Petrovic

In this tip, I want to represent a quick lightweight possibility (one of many) for parsing command line arguments on the fly using C++17.

C++ 17 variadic template pack to runtime

7 Jan 2018 by Michael Chourdakis

Reduce function recursion with variadic templates

C++17

C++ 17 New Features and Trick

13 Mar 2020 by Volynsky Alex

New features of the C++17 standard

C++/WinRT Runtime Component in Win32 Applications - Part 2

17 Jan 2022 by Giuseppe Pischedda

Part 2 - Templates and variadic templates

C++17

C++

Dev

C++/WinRT Runtime Component in Win32 Applications - Part 3

14 Jan 2022 by Giuseppe Pischedda

How to create a Win32 C++ Application that "consumes" a C++/WinRT Component Runtime

C++17 Easy String to Number and Vice Versa

27 Jan 2024 by Shao Voon Wong

C++17 easy string to number and vice versa conversions in header-only class

C++17

C++

C++17: Benchmark of Singular Min/Max and Iterator Versions

16 Jan 2020 by Shao Voon Wong

Benchmark of Singular Min/Max and Iterator Versions

C++17

C++

C/C++: Allocate Variable-size Arrays on the Stack

24 May 2020 by Shao Voon Wong

How to allocate variable-size arrays on the Stack in C/C++

C++17

Can someone explains me what does while loop do in this piece of code? I mean oroperator is used but what is the condition fror operator ? LINKEDLIST

14 Dec 2021 by Ramandeep Singh Dec2021

```` // this is a code class Solution { public: ListNode* addTwoNumbers(ListNode* l1, ListNode* l2) { int carry = 0, first, second; ListNode *head = new ListNode(0), *tail = head; **while (l1 || l2 || carry)** { ...

C++17

Can someone explains me what does while loop do in this piece of code? I mean oroperator is used but what is the condition fror operator ? LINKEDLIST

14 Dec 2021 by OriginalGriff

You understand OR, I assume? a || b is true is either a, b, or both is true: it is only false if both a and b are both false. And in C (and so C++) any non-zero value is true, so any valid link in l1 or l2 or carry will mean the loop goes around...

C++17

Cc code output not working acc to given code.

3 Feb 2022 by Pratiksh Kumar

code not working properly. i used num1%num2. cases where rem =0, its printing again nd again 0. Please the code. What I have tried: #include using namespace std; int main() { int num1,num2; coutnum2 \n"; ...

C++17

Cc code output not working acc to given code.

3 Feb 2022 by M Imran Ansari

You are assigning in If block instead of checking the equality. Correct If condition if(num==0) { cout

C++17

Cc code output not working acc to given code.

3 Feb 2022 by Tony Hill

You are not testing num for 0 correctly. You should do if(num == 0) not if (num=0) In your code you are assigning 0 to num because you are using a single equals sign which will be successful which the if statement evaluates to...

C++17

Check if linked list is palindrome or not.

6 Jun 2021 by Member 15231776

int length(ListNode* head){ int ct = 0; ListNode* temp = head; while(temp != NULL){ temp = temp->next; ct++; } return ct; } ListNode* reverse(ListNode* head){ ListNode*...

C++17

C++

DSA

Check if linked list is palindrome or not.

6 Jun 2021 by OriginalGriff

Compiling does not mean your code is right! :laugh: Think of the development process as writing an email: compiling successfully means that you wrote the email in the right language - English, rather than German for example - not that the email...

C++17

C++

DSA

Convert a Win32 Project to WinUI3 Automatically

20 Jan 2024 by Michael Chourdakis

A set of tools to create a new VCXPROJ file automatically

Creating Shellcode from any Code Using Visual Studio and C++

7 Jun 2021 by The Ænema

Learn how to convert any code to a stable shellcode using Visual Studio 2019 and VC++ in easy steps!

DIY µ-range: The Very Versatile Range View / Iterator Pair

8 Dec 2021 by John M. Dlugosz

A simple pair of iterators provides many handy use cases

C++17

C++

Dev

Eliminate this right shift count warning

4 Oct 2023 by honey the codewitch

I've got a persistent warning across all the compilers I've tried. It has to do with the srf var in the "What have you tried" section. Basically the compiler doesn't know that srf can't be very big. Specifically, it is limited to the...

C++17

Eliminate this right shift count warning

4 Oct 2023 by OriginalGriff

Have you tried ANDing it with 111111b? Since the value can't be bigger than 63 that might shut the compiler up?

C++17

Enforcing a Static Interface in C++

2 Feb 2023 by Bruno van Dooren

Ways to enforce an interface contract on static methods, similar to what you would expect from static virtual methods if they'd exist in C++

Error LNK2019: unresolved external symbol on phidgets code

31 Mar 2020 by Member 14162950

I am trying to build a C++ example program from the Phidgets company website that monitors and logs three devices. Using either VS2017 or VS2019 gives 20 lines of messages similar to this one: Log_Mul_Phids(C17_9).obj : error LNK2019: unresolved...

C++17

VS2019

Error LNK2019: unresolved external symbol on phidgets code

30 Mar 2020 by Maciej Los

Please, follow the instruction from MSDN: Linker Tools Error LNK2019 | Microsoft Docs[^]

C++17

VS2019

Error LNK2019: unresolved external symbol on phidgets code

31 Mar 2020 by steveb

Did you include the .LIB file in your linker input?

C++17

VS2019

Expression must have a constant value. However, putting constant value doesn't change anything

25 Oct 2021 by shadi zgheib

I keep receiving an error saying "Expression must have a constant value the value of variable 'n1' cannot be used as a constant ". I don't know what am I use suppose to do to fix it. void merge(DataType theArray[], int first, int mid, int last)...

C++17

C++

Expression must have a constant value. However, putting constant value doesn't change anything

25 Oct 2021 by Patrice T

void merge(DataType theArray[], int first, int mid, int last) // did you forgot the '{' here ? int i, j, k; int n1 = mid - first + 1; int n2 = last - mid; int L1[n1], R1[n2]; //n1, n2 are giving me the same problem mentioned above for (i =...

C++17

C++

Expression must have a constant value. However, putting constant value doesn't change anything

25 Oct 2021 by k5054

You don't say what compiler/OS you are using, but since this above snippet is accepted by gcc, I am guessing that you are using MSVC, which does not support variable length arrays. You will have to use dynamic memory allocation to create an...

C++17

C++

Force C++ to interpret line as a template function invocation instead of operator <

10 Apr 2021 by honey the codewitch

I'm trying to invoke a template function from inside another template, and the C++ compiler is getting confused trying to parse my code. Basically what's happening is it can't tell that my function is a template function. It thinks it's a field,...

C++17

C++

Force C++ to interpret line as a template function invocation instead of operator <

10 Apr 2021 by Greg Utas

This is fancier than anything I've done with templates, so I could be off base here. But recently there was a question involving the use of typename to explicitly flag a type within a template, and yours looks related to that, only a little...

C++17

C++

From C++ 11 to C++ 17: A Walkthrough

5 Jan 2018 by Michael Chourdakis

The most appealing (to me!) new C++ features

C++14

C++17

C++11

From Modern to Unbelievably Modern C++

20 Jun 2023 by Coral Kashri

CoreC++ talk - experience summarize, and self opinions

C++17

C++

Fundamental Type Specialization in C++

3 Jan 2020 by goranorsander

A class template for specializing fundamental types

GFX In Depth: Part 1 - Drawing Fundamentals

3 Jun 2021 by honey the codewitch

Explore techniques for drawing using GFX

GFX Part 1: A Device Agnostic Pixel

11 Apr 2021 by honey the codewitch

A device independent graphics library for IoT devices. Part 1 of a series.

GFX Part 2: Device Independent Bitmaps

17 Apr 2021 by honey the codewitch

GFX IoT graphics library part 2 - device independent bitmaps

GFX Part 3: Drawing Primitives

25 Apr 2021 by honey the codewitch

Explore the basic drawing functionality provided by the GFX IoT library

GFX Part 4: The ILI9341 Display Driver and JPEG Support

4 May 2021 by honey the codewitch

Use an ILI9341 display efficiently from an ESP32 without the Arduino framework. Load JPEGs.

Hacking on Structured Bindings

23 Jun 2018 by John M. Dlugosz

Using the new structured binding feature in your API design

C++17

C++

Having a problem getting the peb corrently

6 May 2023 by Richard MacCutchan

Why not use the features provided: NtQueryInformationProcess function (winternl.h) - Win32 apps | Microsoft Learn[^] ?

MASM

C++17

ASM

Having a problem getting the peb corrently

7 May 2023 by WOLF 2018

So I have been working on learning the windows low end side of thing and I created some asm to access the peb without using any library's. This is because my project has /NODEFAULTLIB on and no inputs in Visual Studio So my project is about...

MASM

C++17

ASM

Having a problem getting the peb corrently

7 May 2023 by merano99

As Richard already pointed out, there are quite a few Windows system calls in the rest of the code and it would certainly be possible to get the pointer without assembler, but if you really want to, you can do it with VisualStudio and assembler. ...

MASM

C++17

ASM

How can I code this poject

26 Mar 2023 by Emily Wael

Mohamed has an array A with N element, Mohamed wants to know if there is three numbers that Ai * Aj

C++17

How can I code this poject

26 Mar 2023 by Rick York

Here is one place to start : cplusplus.com : fgets[^]. The sample code shows you how to open a file, read from it, and close it. That's what you need to do to read the data from the file. This function - cplusplus.com : atoi/[^], can be used...

C++17

How can I code this poject

26 Mar 2023 by OriginalGriff

While we are more than willing to help those that are stuck, that doesn't mean that we are here to do it all for you! We can't do all the work, you are either getting paid for this, or it's part of your grades and it wouldn't be at all fair for...

C++17

How do I answer this?

18 Nov 2021 by Hansen 2021

Sample Input 3 6 -4 2 -1 8 4 5 8 -1 82 33 14 -5 60 79 84 5 -4 -7 8 4 -11 Sample Output 1 2 3 Output is a smallest order different value What I have tried: #include int main(){ int C; int N; int n; scanf("%d", &C); for(int i =...

C++17

How do I answer this?

18 Nov 2021 by OriginalGriff

Firstly, there is no obvious connection between the input and the desired output - so go back to the original assignment, and read it carefully. Then try to process the input manually and generate the output - hwne you hav eit manually, it should...

C++17

How do I answer this?

18 Nov 2021 by KarstenK

You best start with some Learn C tutorial to learn the basic. Pay attentation how to use the debugger. Without the knowledge and skills to develop code you cant move on and will get a bad rating from your teacher. tip: also search on Youtube...

C++17

How do I correct my output of "available rooms"?

8 Jan 2022 by Sheeda Bro

I am storing Floor objects in Floor floor_arr[3] array. Then using this array to call Floor class display() function. The problem is available rooms are always 0 because of constructor. I guess the available rooms value is not being returned by...

How do I correct my output of "available rooms"?

8 Jan 2022 by KarstenK

You mismatching the objects. Writing "Clear code" with better names would help you to avoid such bugs. Change to: int main() { int floorInput, roomsInput; Hotel hotel; Floor floor; Use the debugger for further details.

How do I correct my output of "available rooms"?

8 Jan 2022 by Stefan_Lang

You are calling the display method on your Hotel object and that displays the Floors within that Hotel, but you never correctly initialized the Floor objects stored inside your Hotel object. Instead you created and initialized a separate Floor...

How do I create a button in C++

26 May 2019 by Member 14470453

I have created a project in Dev C++, but I need to create a window and control mouse events over a button. Could you help me please? What I have tried: I used next cod, but it do not works properly // Grafica de la circunferencia //#include #include #include ...

C++17

How do I create a button in C++

25 May 2019 by Maximilien

I don't know Dev C++ , but you need a GUI toolkit to create buttons. As far as I can see, you need to create a new project of type "Windows Application" and start coding Win32 UI elements. For example : How to Make Button in Dev C++ | C++ Tutorial - YouTube[^] Good luck.

C++17

How do I create a button in C++

26 May 2019 by Tonex247

Buttons are actually windows and are created same way: #define btn_ID 5000 //used as the button's id during creation HWND hwndButton = CreateWindowEx( 0, L"BUTTON", // Predefined class; Unicode assumed L"OK", // Button text WS_TABSTOP | WS_VISIBLE | WS_CHILD |...

C++17

How do I create a button in C++

26 May 2019 by CPallini

It looks your trying to use a port of the BGI library to Windows. Here you may find documentation and smple code: Borland Graphics Interface (BGI) Documentation[^].

C++17

How do I create a C++ console program that does not show a screen?

24 Jan 2024 by Dave Kreskowiak

A better choice would be a Windows Service since they have no UI at all. Trying to do this as a normal, user launchable app seems ... suspicious.

C++17

Windows

How do I create a C++ console program that does not show a screen?

24 Jan 2024 by Maxim Kartavenkov

You can create regular windows application not the console application, just do not create any dialogs and proceed like you do as you had the console application. There will be just linker configuration change and the function WinMain instead of...

C++17

Windows

How do I create a C++ console program that does not show a screen?

24 Jan 2024 by k5054

It's not clear what you're trying to achieve. If you want to create a service, then you should follow the advice in Solution 1. If you're trying to create a commandline utility, like copy for example, then what you're doing is probably what you...

C++17

Windows

How do I create a C++ console program that does not show a screen?

24 Jan 2024 by Eduardo Quintana

I need to create a C++ console program that executes without exhibiting a window of any kind. All processing should be done in the background without any screen drawing. What I have tried: I tried to hide the console window but it always...

C++17

Windows

How do I create a C++ console program that does not show a screen?

30 Jan 2024 by steveb

Use a WinMain without the window creation

C++17

Windows

How do I parse a string into a vector of doubles

12 Aug 2021 by T Bones Jones

I am trying to parse a rather long string of csv values into a vector of doubles. Here is my string: 290, -44.71807341742762, -253.3983378443242, -2830.845102033997, -50.72846875682069, -244.9233159558827, -2828.886659819535, -27.65164366754831,...

C++17

C++

How do I parse a string into a vector of doubles

12 Aug 2021 by Rick York

The reason it works is you were passing the separator by reference the first time and by value the second. It works when it is passed by value. What I do is if an item is not changed and is plain, old data (POD) then I always pass it by value. ...

C++17

C++

How to consume c++17 modules in managed code?

11 Mar 2019 by Member 10068530

I want to consume c++17 modules from managed clr/c++ code. Is it possible? What I have tried: I have built a dll with c++ modules. Consumed it from a console application without turning /clr. Everything worked. Once i turn on /clr switch, it does not work. My clr console application has...

C++17

modules

CLR

How to consume c++17 modules in managed code?

11 Mar 2019 by steveb

There are many ways you can do that: 1. Implement your C++ 17 as DLL and export "C" function interface. There are ton of material on google how to call DLLs from CLR or .Net langs. 2. Implement as COM DLL. This one can be called by any language VB, C#, C++, C etc 3. Implement as COM EXE server....

C++17

modules

CLR

How to convert system command output to string ?

19 Oct 2022 by Death Smoke

I Want to convert the output of this code to string type , but i cant make it. #pragma warning(disable : 4996) #include int main() { char cmd[10]; strcpy(cmd, "dir"); system(cmd); } What I have tried: I tried to...

How to convert system command output to string ?

16 Oct 2022 by merano99

The command system() creates a new process to handle the specified command. char cmd[10]; strcpy(cmd, "dir"); system(cmd); In most cases, this is neither performant nor useful. But of course you can start a process with C this way. You could...

How to convert system command output to string ?

19 Oct 2022 by Alexandrnn

#include #include int main() { system("dir"); puts((char*)stdin); } #include #include #include int main() { char cmd[10]; strcpy_s(cmd, 10, "dir"); system(cmd); puts((char*)stdin); }

How to convert system command output to string ?

19 Oct 2022 by CPallini

Are you possibly searching for popen? See, for instance: The Marvelous popen() Function | C For Dummies Blog[^]

How to Create High Performance (and Publication Quality) 2D Graphs in C++ using Morphologica

14 Mar 2023 by sebjameswml

Walks you through the steps needed to draw high quality 2D graphs in your C++ programs using the header-only library morphologica

How to delete a key from the registry using C++ ?

27 Oct 2022 by Death Smoke

Hi all, I Searched how to delete a whole key from the Registry using c++ anyone here can help me because i didnt find any clear example about this subject. the key path is like here : Computer\HKEY_USERS\folder \folder\ folder\{Key name}. So...

How to delete a key from the registry using C++ ?

20 Oct 2022 by Rick York

Have you investigated the RegDeleteKeyExA function (winreg.h) - Win32 apps | Microsoft Learn[^] ? Here is another sample : Deleting Registry Key with Subkeys Win32 C program example[^]

How to delete a key from the registry using C++ ?

25 Oct 2022 by Michael Haephrati

In the code below you can see how to delete a subkey or the entiry key HKEY hKey = NULL; long lReturn = RegOpenKeyEx( HKEY_USERS. _T("folder \folder\ folder\{Key name}"), 0L, ...

How To Do Math in C++ using morph::vvec

19 Sep 2023 by sebjameswml

morph::vvec allows you to do vector math without any external libraries

How to write a program in C++ inwhich user defined data type variable car that store five attributes such as carnammodele, , vendor, ownerid with taking inputs from user for all attributes

26 Aug 2022 by Fatima Zahid 2022

how to write a program in c++ inwhich i have to define user defined data type variable name,car that store five attributes such as carnammodel,,vendor,ownerid with taking inputs from user for all attributes? What I have tried: I tried...

C++17

How to write a program in C++ inwhich user defined data type variable car that store five attributes such as carnammodele, , vendor, ownerid with taking inputs from user for all attributes

26 Aug 2022 by OriginalGriff

C++17

How to write a program in C++ inwhich user defined data type variable car that store five attributes such as carnammodele, , vendor, ownerid with taking inputs from user for all attributes

26 Aug 2022 by Fatima Zahid 2022

// Project36,a car variable as userdefined datatype.cpp : This file contains the 'main' function. Program execution begins and ends there. #include #include #include using namespace std; char structurecar() { char a; int b; char...

C++17

I am unable to change the bitmap images dispayed on an outlookbar style propertysheet

20 Oct 2021 by rdeekonda

I am using an outlookbar style property sheet with 3 property pages as the main window of my application.I am unable to change the bitmap icons displayed on the property sheet.I have given code here which isn't working. Please suggest any...

C++17

MFC

Win32

I am unable to change the bitmap images dispayed on an outlookbar style propertysheet

20 Oct 2021 by KarstenK

The MS controls are creating an own copy of the bitmaps. So when you want to change them, you need to destroy the control and recreate a new object with the new bitmaps.

C++17

MFC

Win32

I am unable to change the bitmap images dispayed on an outlookbar style propertysheet

20 Oct 2021 by Rick York

Yes, KarstenK is correct. If I were you, I would preload all the bitmaps and maintain handles to them. Then when the selection changes building your list will be very fast because you don't have to load any of them. You can just assemble the...

C++17

MFC

Win32

I write this program but console just ask input of first variable and not ask input of other variables and print program just output ?

26 Aug 2022 by Fatima Zahid 2022

C++17

I write this program but console just ask input of first variable and not ask input of other variables and print program just output ?

26 Aug 2022 by OriginalGriff

Simple: you are reading a single character into a and assuming that it will hold everything. It won't, its a char not a string, so it holds just one character: 'A', 'z', or ';'. If you want more data, you need to allocate space for it! Try...

C++17

I write this program but console just ask input of first variable and not ask input of other variables and print program just output ?

26 Aug 2022 by CPallini

Your code doesn't resemble C++ 'typical' one. Try #include using namespace std; class Car { private: string m_name, m_model; int m_horsepower; public: Car( string name, string model, /* ... */ int horsepower) : m_name{name},...

C++17

Implementation of Resizable Multidimensional Arrays in C++17

13 Nov 2019 by Mikhail Semenov

This article discusses an implementation of multidimensional array class with resizable dimensions. Access to subarrays and their swapping are allowed. Benchmarks are provided, which compare the performance of this implementation with Boost and standard C arrays.

C++17

Dev

Indexing into a bitmap problem

20 Aug 2023 by honey the codewitch

I have an issue where I'm writing out a simple 8-bit grayscale bitmap as I read it from a stream. The issue is this: I'm going top to bottom left to right, and attempting to read the pixels out of the bitmap sequentially. I feel like this...

C++17

C++

Indexing into a bitmap problem

20 Aug 2023 by Andre Oosthuizen

From what I could read (might be missing the ball completely) - There shouldn't be a need for the extra seek operation, as you're already calculating the offset based on the pixel's position. It is possible that the issue might be related to the...

C++17

C++

Is this a compiler bug or my bug?

20 Mar 2018 by Member 3733166

Run the the following program twice. Once with the given destructor and once with "std::fesetround(value);" removed from the destructor. Why do I receive different outputs? Shouldn't destructor be called after function "add"? #include #include #include struct...

C++17

Is this a compiler bug or my bug?

20 Mar 2018 by Jochen Arndt

The destructor is called when the object goes out of scope. That is after the add() call in your code. But the rounding mode affects also string conversions. So the difference in the output is not created by the add() operations but by printing out the results: - With resetting the mode cout...

C++17

Is this a compiler bug or my bug?

20 Mar 2018 by CPallini

It is a cout artifact. Try, for instance std::cout

C++17

It is Better to Use Devector Than std::deque

10 Sep 2022 by Mikhail Semenov

This article shows that double-ended vector is much faster than std::deque and should be preferred.

Kick start 2021 round C

23 May 2021 by OriginalGriff

C++17

Kick start 2021 round C

23 May 2021 by Patrice T

Quote: Kick start 2021 round C Your problem is that your code is not related to Google's problem. Your task is to write code solving the requirement. The word 'problem' in Google's problem is a requirement, the word 'problem' in your code is...

C++17

26 Aug 2018 by Member 13927859

Hi , I try to access to main window from a dialog box which is the login interface. My scenario is to check if the psw is correct ,then it shows the window frame (SDI) (if the PSW is correct) by clicking on "Enter" key board (not an OK button). I will work with dialog box and SDI . My problem is...

C++17

24 Aug 2018 by Member 13927859

BOOL CIntClientApp::InitInstance() { // InitCommonControlsEx() est requis sur Windows XP si le manifeste de l'application // spécifie l'utilisation de ComCtl32.dll version 6 ou ultérieure pour activer les // styles visuels. Dans le cas contraire, la création de fenêtres échouera....

C++17

26 Aug 2018 by Member 13927859

I try with this code , but also ,I can access to second interface with an incorrect PSW. void CLoginDlg::OnLogin() { UpdateData(TRUE); CWnd* pwndCtrl = GetFocus(); int ctrl_ID = pwndCtrl->GetDlgCtrlID(); CLoginDlg LoginDlg; switch (ctrl_ID) { case IDC_EDIT_PSW: UpdateData(TRUE);...

C++17