CodeProject Latest postings for Managed C++/CLI

The C++ / CLI is for managed and mixed-mode C++ programming only

Chris Maunder — Mon, 09 Jan 2006 20:36:00 GMT

This message board is for managed and mixed-mode C++ programming only: Managed C++ in VC++.NET or C++/CLI. Please post all standard C++ programming questions in the Visual C++ board[^].

cheers,
Chris Maunder

CodeProject.com : C++ MVP

MultiThreading/Synchronization related problem

Amrit Agr — Mon, 15 Apr 2024 17:22:00 GMT

Hi Friends,

I have been asked this below question in a interview related to MultiThreading/Synchronization
I don't have much expertise in the same area.
Please help me with the solution.
Thanks in Advance

Problem->
Develop a C++ program to demonstrate threading and synchronization.

Char code generated by main process on press of key. (int iChar = getch(); )

Application will accept key between 0 to 9 only.

Three threads are spawned by main process to display key pressed

Any one of the thread will display the Number key pressed and and Thread ID

If No key is pressed Threads will wait for input.

Process will be terminated if Key '0' is pressed.

Need Help (Command Console)

Mahek Thapa — Sat, 30 Mar 2024 15:17:00 GMT

hey guys i am new here i need help you guys are pro i hope i am in right place i need some dll to call function like command console press key to call console then you type in it "hello guys" it will output hello guys as strings

how i wanna use that dll

load_library "Console.dll"

get_proc_address "Commands"

Convert From C# to C++/CLI

Paramu1973 — Sat, 02 Mar 2024 01:26:00 GMT

Hi, I try to convert from C# to C++/Cli. I have a small application in C#. When I try to print the RDLC report directly to printer, I found a c# online-codes.

public static void Print(this LocalReport report, PageSettings pageSettings)
{
    string deviceInfo =
        $@"<DeviceInfo>
            <OutputFormat>EMF</OutputFormat>
            <PageWidth>{pageSettings.PaperSize.Width * 100}in</PageWidth>
            <PageHeight>{pageSettings.PaperSize.Height * 100}in</PageHeight>
            <MarginTop>{pageSettings.Margins.Top * 100}in</MarginTop>
            <MarginLeft>{pageSettings.Margins.Left * 100}in</MarginLeft>
            <MarginRight>{pageSettings.Margins.Right * 100}in</MarginRight>
            <MarginBottom>{pageSettings.Margins.Bottom * 100}in</MarginBottom>
        </DeviceInfo>";
    Warning[] warnings;
    var streams = new List<Stream>();
    var pageIndex = 0;
    report.Render("Image", deviceInfo,
        (name, fileNameExtension, encoding, mimeType, willSeek) =>
        {
            MemoryStream stream = new MemoryStream();
            streams.Add(stream);
            return stream;
        }, out warnings);
    foreach (Stream stream in streams)
        stream.Position = 0;
    if (streams == null || streams.Count == 0)
        throw new Exception("No stream to print.");
    using (PrintDocument printDocument = new PrintDocument())
    {
        printDocument.DefaultPageSettings = pageSettings;
        if (!printDocument.PrinterSettings.IsValid)
            throw new Exception("Can't find the default printer.");
        else
        {
            printDocument.PrintPage += (sender, e) =>
            {
                Metafile pageImage = new Metafile(streams[pageIndex]);
                Rectangle adjustedRect = new Rectangle(e.PageBounds.Left - (int)e.PageSettings.HardMarginX, e.PageBounds.Top - (int)e.PageSettings.HardMarginY, e.PageBounds.Width, e.PageBounds.Height);
                e.Graphics.FillRectangle(Brushes.White, adjustedRect);
                e.Graphics.DrawImage(pageImage, adjustedRect);
                pageIndex++;
                e.HasMorePages = (pageIndex < streams.Count);
                e.Graphics.DrawRectangle(Pens.Red, adjustedRect);
            };
            printDocument.EndPrint += (Sender, e) =>
            {
                if (streams != null)
                {
                    foreach (Stream stream in streams)
                        stream.Close();
                    streams = null;
                }
            };
            printDocument.Print();
        }
    }
}

For the above code I convert it like the below, but still need to improve the conversion, any helps please. Thanks. And my converted codes.

public: static System::Void Print(LocalReport^ report, PageSettings^ pageSettings){
             String^ deviceInfo =
                 $@"<DeviceInfo>
                 <OutputFormat>EMF< / OutputFormat>
                 <PageWidth>{pageSettings->PaperSize->Width * 100}in< / PageWidth>
                 <PageHeight>{pageSettings->PaperSize->Height * 100}in< / PageHeight>
                 <MarginTop>{pageSettings->Margins->Top * 100}in< / MarginTop>
                 <MarginLeft>{pageSettings->Margins->Left * 100}in< / MarginLeft>
                 <MarginRight>{pageSettings->Margins->Right * 100}in< / MarginRight>
                 <MarginBottom>{pageSettings->Margins->Bottom * 100}in< / MarginBottom>
                 < / DeviceInfo>";
                 cli::array<Warning^>^ warnings = gcnew cli::array<Warning^>();
                 //Warning[] warnings;
                 cli::array<Stream^>^ streams = gcnew cli::array<Stream^>();
                 //var streams = new List<Stream>();
                 int pageIndex = 0;
                 report->Render("Image", deviceInfo, (name, fileNameExtension, encoding, mimeType, willSeek) = > {
                 MemoryStream^ stream = gcnew MemoryStream();
                 streams->Add(stream);
                 return stream;
                 }, out^ warnings);
                 for each(Stream^ stream in streams) {
                     stream->Position = 0;
                     if (streams == nullptr || streams->Length == 0) {
                         throw gcnew Exception("No stream to print.");
                     }
                     else {
                         PrintDocument^ printDocument = gcnew PrintDocument();
                         printDocument->DefaultPageSettings = pageSettings;
                         if (!printDocument->PrinterSettings->IsValid)
                             throw gcnew Exception("Can't find the default printer.");
                         else
                         {
                             printDocument->PrintPage += (sender, e) = >
                             {
                                 Metafile^ pageImage = gcnew Metafile(streams[pageIndex]);
                                 Rectangle^ adjustedRect = gcnew Rectangle(e->PageBounds->Left - (int)e->PageSettings->HardMarginX, e->PageBounds->Top - (int)e->PageSettings->HardMarginY, e->PageBounds->Width, e->PageBounds->Height);
                                 e->Graphics->FillRectangle(Brushes->White, adjustedRect);
                                 e->Graphics->DrawImage(pageImage, adjustedRect);
                                 pageIndex++;
                                 e->HasMorePages = (pageIndex < streams->Count);
                                 e->Graphics->DrawRectangle(Pens->Red, adjustedRect);
                             };
                             printDocument->EndPrint += (Sender, e) = >
                             {
                                 if (streams != nullptr)
                                 {
                                     foreach(Stream^ stream in streams)
                                         stream->Close();
                                     streams = nullptr;
                                 }
                             };
                             printDocument->Print();
                         }
                     }
                 }
         }

Trying to Add System::ComponentModel

Richard Andrew x64 — Sat, 09 Dec 2023 21:10:00 GMT

I want to use the Win32Exception class in my C++/CLI DLL. The docs say it is located in the System::ComponentModel namespace.

But Intellisense is telling me that there is no ComponentModel namespace inside System.

And worse, there is no System.ComponentModel DLL to which to add a reference.

I'm stuck. How do I get the System::ComponentModel namespace and its classes into my DLL?

The difficult we do right away...
...the impossible takes slightly longer.

TreelistView c++/cli

Temblor — Tue, 22 Aug 2023 09:05:00 GMT

hi guys

im working on c++/ cli project and i need something like objectlistview of TreelistView so i can display treeview with multi columns

Heap Corruption in richedit

ForNow — Sun, 15 Jan 2023 23:49:00 GMT

Hi

I am getting a heap corruption. I am running under the visual studio debugger. and the exception is at

Quote:

ntdll.dll!RtlReportCriticalFailure() Unknown

My scenario is I have a DLL reading and formatting data for a .exe. I keep a record count so when I get a exception, at

Quote:
ntdll.dll!RtlReportCriticalFailure() Unknown

I insert code if (recordcount == 0x0000196e) __debugbreak; I then start stepping through the code looking for the problem how ever when stepping through the code works I try this multiple times however when I stop the code where the exception were to occur it always complete successfully

The listing I am trying to to inset in the richedit is huge about 153 pages 30 lines to page, 134 bytes across I roughly calculate the number of bytes I am trying to insert into the richedit is 1.6 meg. I am not sure if the size is the issue I do a Rciheditctrl::LimitText with the amount bytes I need

Again when break on the offending record and step thru the code it completes normally

Here is the stack frame My code starts a the DriveRichedit.exe

ntdll.dll!RtlReportCriticalFailure() Unknown
ntdll.dll!RtlpHeapHandleError() Unknown
ntdll.dll!RtlpHpHeapHandleError() Unknown
ntdll.dll!RtlpLogHeapFailure() Unknown
ntdll.dll!RtlpHeapFindListLookupEntry() Unknown
ntdll.dll!RtlpFindEntry() Unknown
ntdll.dll!RtlpAllocateHeap() Unknown
ntdll.dll!RtlpAllocateHeapInternal() Unknown
riched20.dll!CTxtArray::AddBlock(long,long) Unknown
riched20.dll!CTxtArray::SplitBlock(long,long,long,long,int) Unknown
riched20.dll!CTxtPtr::InsertRange(long,unsigned short const *) Unknown
riched20.dll!CRchTxtPtr::ReplaceRange(long,long,unsigned short const *,class IUndoBuilder *,long,long *,unsigned long) Unknown
riched20.dll!CTxtRange::ReplaceRange(long,unsigned short const *,class IUndoBuilder *,enum SELRR,long *,unsigned long) Unknown
riched20.dll!CTxtRange::CheckLimitReplaceRange(long,unsigned short const *,int,class IUndoBuilder *,unsigned long,long *,long,int,unsigned long) Unknown
riched20.dll!CTxtRange::CleanseAndReplaceRange(long,unsigned short const *,int,class IUndoBuilder *,unsigned short *,long *,unsigned long) Unknown
riched20.dll!CLightDTEngine::ReadPlainText(class CTxtRange *,struct _editstream *,int,class IUndoBuilder *,long) Unknown
riched20.dll!CLightDTEngine::LoadFromEs(class CTxtRange *,long,struct _editstream *,int,class IUndoBuilder *) Unknown
riched20.dll!CTxtEdit::TxSendMessage(unsigned int,unsigned __int64,__int64,__int64 *) Unknown
riched20.dll!RichEditWndProc() Unknown
riched20.dll!RichEditANSIWndProc() Unknown
user32.dll!UserCallWinProcCheckWow() Unknown
user32.dll!CallWindowProcAorW(__int64 ,struct HWND__ *,enum _WM_VALUE,unsigned __int64,__int64,int) Unknown
user32.dll!CallWindowProcA() Unknown
mfc140d.dll!CWnd::DefWindowProcA(unsigned int nMsg, unsigned __int64 wParam, __int64 lParam) Line 1100 C++
mfc140d.dll!CWnd::WindowProc(unsigned int message, unsigned __int64 wParam, __int64 lParam) Line 2100 C++
mfc140d.dll!AfxCallWndProc(CWnd * pWnd, HWND__ * hWnd, unsigned int nMsg, unsigned __int64 wParam, __int64 lParam) Line 265 C++
mfc140d.dll!AfxWndProc(HWND__ * hWnd, unsigned int nMsg, unsigned __int64 wParam, __int64 lParam) Line 418 C++
mfc140d.dll!AfxWndProcBase(HWND__ * hWnd, unsigned int nMsg, unsigned __int64 wParam, __int64 lParam) Line 299 C++
user32.dll!UserCallWinProcCheckWow() Unknown
user32.dll!SendMessageWorker() Unknown
user32.dll!SendMessageInternal(struct HWND__ *,unsigned int,unsigned __int64,__int64,int) Unknown
user32.dll!SendMessageA() Unknown
mfc140d.dll!CRichEditCtrl::StreamIn(int nFormat, _editstream & es) Line 775 C++
> DriveRichEdit.exe!CProgDebug::OnInitDialog() Line 136 C++
[External Code]
DriveRichEdit.exe!CMainFrame::PROGDEBUG() Line 48 C++
[External Code]
DriveRichEdit.exe!WinMain(HINSTANCE__ * hInstance, HINSTANCE__ * hPrevInstance, char * lpCmdLine, int nCmdShow) Line 26 C++
[External Code]

trying to understand DLL and Thread local storage

ForNow — Sun, 04 Dec 2022 19:52:00 GMT

Hi

I have been looking at the examples off dll and TLS

First thing I noticed that

C++

DWORD g_dwThreadIndex;

is in global storage

It would be nice as in the IBM manuals would have registers on at entry to DllMain

I mean is the SP (register) that of the calling application

regardless if the index returned from tlsalloc lets say is 5

and then before the current thread access the storage set by tlssetvalue

another thread does a tlsallloc g_dwThreadindex becomes 6

then the first thread then does tlsgetvalue it would be using 6 instead of 5 obviously I am not understanding something

I mean if gw_dwThreadindex would be defined in the callers stack I would get it

more so is the anyway of knowing the identity of the caller I mean maybe process id or thread guess I could do a call to Startupinfo

Good news, /clr builds will soon add C++ 20 support!

John Schroedl — Tue, 15 Nov 2022 16:49:00 GMT

Here's some good news for anyone dealing with C++/CLI:

Stephan Lavavej recently committed changes to the VC STL which will remove a number of the roadblocks and warnings we've hit using C++/CLI in recent years. The rest of our codebase is moving to use C++20 constructs and the /clr code has had problems.

The PR: Enable /clr C++ 20 support #3194

John

rekursif

Achmad Roihan — Fri, 28 Oct 2022 12:31:00 GMT

apakah anda bisa membantu saya membuat sebuah program yang sama outputnya tetapi beda kode programnya?
tolong bantu aku

#include <iostream>
#include <string>
using namespace std;

// PROGRAM MENGHILANGKAN KARAKTER YANG SAMA DENGAN REKURSIF

void remove(string roihan){
//BASE CASE
if (roihan.length() == 1){
cout<

rekursif program (Recursive Program)

Achmad Roihan — Thu, 27 Oct 2022 05:51:00 GMT

fungsi program adalah menghilangkan karakter yang sama sehingga karakter tersebut hanya munsul satu kali dengan menggunakan rekursif

perogram ku blm sempurnah

Google Translate:
the function of the program is to remove the same character so that the character appears only once by using recursive

my program is not perfect

C++

#include <iostream>
#include <windows.h>
using namespace std;

int main(){

 char nama[1000];
 int index[100];
 cout<<"masukkan nama = ";												

 for(int i=0; i<strlen(nama); i++){
 	
  int n=0;
  
  for(int j=0; j<strlen(nama); j++){
  	
   if(nama[i] == nama[j]){
   	
   n++;
   
    index[j]=i;
   } 
  }
 }

 for(int i=0; i<strlen(nama); i++){
 	
  if(i == index[i]){
  	
   cout<<nama[i];
  }
 }
}

How to close & clear the oledbconnection on form2()_load?

Paramu1973 — Mon, 10 Oct 2022 00:10:00 GMT

Hi,
I am using vs-2015. Managed C++/Cli Windows Forms Applications. I have Form1-MdiContainer & Form2. From Form1_Button_Click() accessing Form2.
In Form2_Load() I have OLEDBConnection. For When I press Form1-Button_Click(),
First time it's working good. Also when I re-click() the same Form1-Button()
the whole application is getting closed. I analysed that when I close the OLEDBConnection, the whole program is also getting closed. And the same code working good in c#. I can't understand my mistakes..! Thanks.

Note:- For First time when I click the Form1-Button no problem it's working good. But for re-click() whole application is getting closed().
Thanks Again

My Codes

Form1-MdiContainer()
private: System::Void button1_Click(System::Object^  sender, System::EventArgs^  e) {
    Form2^ MyStForm = Form2::GetForm(true, this);
    MyStForm->MdiParent = this;
    MyStForm->FormBorderStyle = System::Windows::Forms::FormBorderStyle::None;
    MyStForm->Dock = DockStyle::Fill;
    MyStForm->Show();
}
Form2-Top side
    public ref class Form2 : public System::Windows::Forms::Form
    {
        public: static Form2^ Form2::_instance = nullptr;
        public: static Form2^ Form2::GetForm(bool IsMDIChild, System::Windows::Forms::Form^ MyInstFrm) {
            if (_instance == nullptr)
                _instance = gcnew Form2();
            if (_instance->IsDisposed)
                _instance = gcnew Form2();
            if (IsMDIChild)
                _instance->MdiParent = MyInstFrm;
            return _instance;
        }
        blah..blah...blah...
         }

Form2-Load()
private: System::Void Form2_Load(System::Object^  sender, System::EventArgs^  e) {
    String^ MyStrConn = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + MyExcelFile + "; Extended Properties=\"Excel 12.0; HDR=YES; OLE DB Services=-1; \"";
    String^ MyExcelFile="C:\Students\Names.xlsx";
    String^ MyExcelSheet = "[Sheet1$]";
    String^ MySQLSelect = "select * from " + MyExcelSheet;
    System::Data::OleDb::OleDbConnection^ Cn1 = nullptr;
    Cn1 = gcnew System::Data::OleDb::OleDbConnection();
    Cn1->ConnectionString = MyStrConn;
    System::Data::OleDb::OleDbCommand^ MyCmd = nullptr;
    MyCmd = gcnew System::Data::OleDb::OleDbCommand();
    MyCmd->CommandText = MySQLSelect;
    MyCmd->Connection = Cn1;
    Cn1->Open();
        System::Data::OleDb::OleDbDataAdapter^ Da1 = gcnew System::Data::OleDb::OleDbDataAdapter(MyCmd);
        Da1->Fill(MyDataTable);
    Cn1->Close(); //????????????????? getting stuck
    if (Cn1 != nullptr){
        MyCmd->Cancel();
    }
    //Cn1->ConnectionString = nullptr;
    //Cn1->ReleaseObjectPool();
    MyCmd = nullptr;
    Cn1 = nullptr;

}

Thanks

How does the compiler achieve the CRT remapping?

John Schroedl — Mon, 22 Aug 2022 20:50:00 GMT

We've noticed that calling C functions such as abs() will call into the C Runtime implementation of abs() for a Debug build but will call into System::Math::Abs in a Release build. This was pretty unexpected as the substitution of System::Math::Abs will trigger .NET exceptions such as System::OverflowException for out of bounds conditions whereas the CRT will always return a value.

For example, this will crash in Release but exit normally in Debug. Yes, it's UB so anything is possible but it also calls System::Math::Abs even if the args are normal values. This just illustrates the exception vs non-exception.

C++

#include <cmath>
#include <stdio.h>

int main(int, char**) 
{
    return std::abs(INT_MIN);
}

Does anyone have any links or good search terms for this C Runtime substitution behavior they're doing? ex. Does the loader redirect calls into System:: entrypoints for things besides abs()? I'd like to see that list so I know which calls may need to be guarded with try/catch.

I can understand that they do this swap for performance purposes and to avoid extra managed->native->managed transitions but it was news to me that this was ocurring.

John

[Solved] I hope there is a Managed C++/CLR person left to help me with Parallel::For

madusmacus — Wed, 27 Jul 2022 14:25:00 GMT

Microsoft Documentation allows me to change the pull down to C++ from C# but continues to shows C# syntax

#pragma once

namespace CppTutorial {

	using namespace System;
  using namespace System::Threading::Tasks;

	/// <summary>
	/// Summary for MainForm
	/// </summary>
	public ref class MainForm : public System::Windows::Forms::Form
	{
	public:
		MainForm(void)
		{
			InitializeComponent();
			//
			//TODO: Add the constructor code here
			//
		}

	protected:
		/// <summary>
		/// Clean up any resources being used.
		/// </summary>
		~MainForm()
		{
			if (components)
			{
				delete components;
			}
		}

	private:
		/// <summary>
		/// Required designer variable.
		/// </summary>
		System::ComponentModel::Container ^components;

#pragma region Windows Form Designer generated code
		/// <summary>
		/// Required method for Designer support - do not modify
		/// the contents of this method with the code editor.
		/// </summary>
		void InitializeComponent(void)
		{
      this->SuspendLayout();
      // 
      // MainForm
      // 
      this->AutoScaleDimensions=System::Drawing::SizeF(6,13);
      this->AutoScaleMode=System::Windows::Forms::AutoScaleMode::Font;
      this->ClientSize=System::Drawing::Size(284,261);
      this->Name=L"MainForm";
      this->Text=L"MainForm";
      this->Shown+=gcnew System::EventHandler(this,&MainForm::MainForm_Shown);
      this->ResumeLayout(false);

    }
#pragma endregion

  public:
  
  static void Body(int index)
  {
    int test=0;
  }

  delegate void MyDelegate(int index);

  System::Void MainForm_Shown(System::Object^ sender,System::EventArgs^ e) 
  {
    MyDelegate ^body=gcnew MyDelegate(MainForm::Body);     
    ParallelLoopResult ^result=Parallel::For(0,10,(System::Action <int> ^)body);
  }

  };
}

I know its all a bit bodged but its the only way i could get it to compile and link but the problem is obvious run time crash
System.InvalidCastException:
Unable to cast object of type 'MyDelegate' to type 'System.Action`1[System.Int32]'.

in MC++/CLI i cant find the right syntax to use for
ParallelLoopResult ^result=Parallel::For( without casting to Action
there is no generic delegate in the overides

Is there any MC++/CLI people left out there that can help or offer any other way to paralleize a for loop

i tried the old parallel_for(x,y,z){ "do stuff here" } way but
i couldnt get that very far with that either
i prefer to stick with .net but this delegate stuff omg :¬( im to old hehe

Thanks for even bothering to read this

c++ forms 2022 code

Member 8848464 — Fri, 17 Jun 2022 11:37:00 GMT

What is the wrong with this code?
I simply want to show data from a datatable I have just made in a datagidview.
The code runs well but doesn't show the data. NB: the code written in c++ winforms 2022
The code:

DataTable ^dt = gcnew DataTable();
					 
					 dt->Columns->Add("Name");
					 dt->Columns->Add("Surname");
					 dt->Columns->Add("Address");
					 dt->Columns->Add("Phone");

					 DataRow^ datarow = dt->NewRow();
					 					 
					 datarow["Name"] = <pre lang="C++">

"Ahmad";
datarow["Surname"] = "Hassan";
datarow["Address"] = "Cairo";
datarow["Phone"] = "0987654321";

dt->Rows->Add(datarow);

dataGridView1->DataSource = dt;

I want to write a C++/CLI wrapper class library which can be utilized in both C++ and C# applications.

Member 12162400 — Fri, 10 Jun 2022 07:45:00 GMT

I want to write a C++/CLI wrapper class library which can be utilized in both C++ and C# applications. Step by step procedure will be more helpful along with project configurations.Basically i want to consume the c++/cli dll in both the applications. i need to write a wrapper which will be compatible with both the applications

simplifying code

hshan_ — Tue, 15 Mar 2022 16:30:00 GMT

i could use some tip about simplifying this code:

class Pojazd
{
public:

    virtual void buduj()=0;
};

class Sedan : Pojazd
{
private:
    string typ="Sedan";
public:
    string marka;
    string model;
    int hp;//horse power
    double v;//pojemnosc silnika
    int cena;
    virtual void buduj()
    {
        cout << marka << " " << model << " " << endl;
        cout << "Typ nadwozia: " << typ << endl;
        cout << "Dane Techniczne: " << endl;
        cout << "-" << hp << " KM" << "\n-Silnik: " << v << "L" << endl;
        cout << "Cena " << cena << "\nmiesieczna rata " << cena / 12 << endl;
    }
    Sedan(string nadwozie)
    {
        nadwozie = typ;
    }

};

class Hatchback : Pojazd
{

    string typ;
public:
    string marka;                                             
    string model;
    int hp;//horse power
    double v;//pojemnosc silnika
    int cena;
    virtual void buduj()
    {
        cout << marka << " " << model << " " << endl;
        cout << "Typ nadwozia: " << typ << endl;
        cout << "Dane Techniczne: " << endl;
        cout << "-" << hp << " KM" << "\n-Silnik: " << v << "L" << endl;
        cout << "Cena " << cena << "\nmiesieczna rata " << cena / 12 << endl;
    }
    Hatchback(string typ)
    {
        typ = typ;
    }
};

int main()
{
    w:
    int switch_on;
    cout << "1.Sedan\n2.Hatchback"<<endl;
    cin >> switch_on;
    switch (switch_on)
    {
    case 1:
    {
        cout << "1.Mercedes\n2.BMW\n3.Audi\n";
        cin >> switch_on;
        switch (switch_on)
        {
        case 1:
        {
            Sedan Mercedes("Sedan");
            Mercedes.marka = "Mercedes";
            Mercedes.model = "A klasa";
            Mercedes.hp = 145;
            Mercedes.v = 2.1;
            Mercedes.cena = 156000;

            Sedan* wsk_sedan;
            wsk_sedan = &Mercedes;
            wsk_sedan->buduj();

        }
        case 2:
        {
            Sedan BMW("Sedan");
            BMW.marka = "BMW";
            BMW.model = "d531i";
            BMW.hp = 166;
            BMW.v = 2.5;
            BMW.cena = 188770;

            Sedan* wsk_sedan;
            wsk_sedan = &BMW;
            wsk_sedan->buduj();
        }
         
        }
    
}
        break;
    case 2:
    {
        
    }
        break;
    }
    

   
    

    return 0;
}

i could continue with constructing this switch case tree sort of thingy
but i'm wondering if i can make it simpler and maybe more like a pro ( )
i dont expect ready to go code just some tip/hint so i can find more info myself

Convert From C# To Visual C++ 2015

Paramu1973 — Tue, 14 Dec 2021 07:21:00 GMT

Hi,
I need to generate the following XML codes. And Iam using VS2015.

<TALLYMESSAGE xmlns:UDF="TallyUDF">
  <VOUCHER VCHTYPE="Sales" ACTION="Create">
     <VOUCHERTYPENAME>Sales</VOUCHERTYPENAME>
     <ALLLEDGERENTRIES.LIST>
        <REMOVEZEROENTRIES>No</REMOVEZEROENTRIES>
        <ISDEEMEDPOSITIVE>Yes</ISDEEMEDPOSITIVE>
        <LEDGERFROMITEM>No</LEDGERFROMITEM>
        <LEDGERNAME>Customer 1</LEDGERNAME>
        <AMOUNT>-5000</AMOUNT>
     </ALLLEDGERENTRIES.LIST>
  </VOUCHER>
</TALLYMESSAGE>

For That from our website quick answers, I received the following codes in C#.

[XmlRoot(ElementName="ALLLEDGERENTRIES.LIST")]
public class ALLLEDGERENTRIESLIST { 

    [XmlElement(ElementName="REMOVEZEROENTRIES")] 
    public string REMOVEZEROENTRIES { get; set; } 

    [XmlElement(ElementName="ISDEEMEDPOSITIVE")] 
    public string ISDEEMEDPOSITIVE { get; set; } 

    [XmlElement(ElementName="LEDGERFROMITEM")] 
    public string LEDGERFROMITEM { get; set; } 

    [XmlElement(ElementName="LEDGERNAME")] 
    public string LEDGERNAME { get; set; } 

    [XmlElement(ElementName="AMOUNT")] 
    public int AMOUNT { get; set; } 
}

[XmlRoot(ElementName="VOUCHER")]
public class VOUCHER { 

    [XmlElement(ElementName="VOUCHERTYPENAME")] 
    public string VOUCHERTYPENAME { get; set; } 

    [XmlElement(ElementName="ALLLEDGERENTRIES.LIST")] 
    public ALLLEDGERENTRIESLIST ALLLEDGERENTRIESLIST { get; set; } 

    [XmlAttribute(AttributeName="VCHTYPE")] 
    public string VCHTYPE { get; set; } 

    [XmlAttribute(AttributeName="ACTION")] 
    public string ACTION { get; set; } 

    [XmlText] 
    public string Text { get; set; } 
}

[XmlRoot(ElementName="TALLYMESSAGE")]
public class TALLYMESSAGE { 

    [XmlElement(ElementName="VOUCHER")] 
    public VOUCHER VOUCHER { get; set; } 

    [XmlAttribute(AttributeName="UDF")] 
    public string UDF { get; set; } 

    [XmlText] 
    public string Text { get; set; } 
}

Is It possible to convert this From C# to Visual C++ 2015.

My heartiest thanks for all helps
Always Thank To Richard & Victor & Other Superiors, those who are having kind hearts.
Thank Again

openFileDialog - AccessViolationException was unhandled

Paramu1973 — Mon, 04 Oct 2021 22:28:00 GMT

Hi,
Iam using Vs2015, While I try to Open a file using OpenFileDialog, Iam receiving the error

"Unhandled exception of type" System.AccessViolationException" occoured in system.windows.forms.dll
Additional information: Attempted to read or write protected memory.This is often an indication other memory is currupt.

My Codes

System::Windows::Forms::OpenFileDialog^ MyFileOpenDialog = gcnew System::Windows::Forms::OpenFileDialog();
MyFileOpenDialog->Title = "Select Your Excel Test File";
MyFileOpenDialog->InitialDirectory = "C:\\";
MyFileOpenDialog->Filter = "Excel Files (*.xls)|*.xls|All files (*.*)|*.*";
MyFileOpenDialog->FilterIndex = 2;
MyFileOpenDialog->RestoreDirectory = true;
if (MyFileOpenDialog->ShowDialog() == System::Windows::Forms::DialogResult::OK) {
    MyExcelFile = MyFileOpenDialog->FileName;
}

I cannot understand my mistake !
Thanks For the helps!
Richard pls. advise me! Thank again !

Convert/cast System::Array class to List

yehiga1467 — Fri, 11 Jun 2021 03:51:00 GMT

How do I convert array to list?

array<System::Byte>^ My1DArray = gcnew array<System::Byte>(100);

List<System::Byte>^ temp

temp = My1DArray.ToList(); //doesn't work

Update:

I am currently using a for loop to copy data 1 by 1, if there's no other faster way ,i'll stick with this for now . Thanks!

array<System::Byte>^ My1DArray = gcnew array<System::Byte>(100);

int^ bytesToRead = gcnew(int);
*bytesToRead = SerialPort->BytesToRead;
SerialPort->Read(My1DArray, 0, *bytesToRead);
SerialPort->DiscardInBuffer();

List<System::Byte>^ temp = gcnew List<System::Byte>;

int^ counter = gcnew (int);
for (*counter = 0; *counter < *bytesToRead; (*counter)++) {
    temp->Add(My1DArray[*counter]);
}