c++ - How to swap variables without another variable, XOR usage

int a = 5;
int b = 10;

std::cout << "A = " << a << "\n";
std::cout << "B = " << b << "\n";
    
a ^= b;
b ^= a;
a ^= b;
    
std::cout << "A = " << a << "\n";
std::cout << "B = " << b << "\n";

Output:

A = 5
B = 10
A = 10
B = 5

c++ - How to make .dll and call it from c#

c++ DLL cpp:

extern "C" __declspec( dllexport )
int math_add( int const d1, int const d2 ) {
    return d1 + d2;
}

Test c++ console app:

#include 

extern "C" __declspec( dllimport ) int math_add( int, int );

int main( int argc, char* argv[] )
{
    int i = math_add( 4, 5 );

    std::cout << '\n' << i << '\n';
    
    std::cout << "Press any key..";

    std::cin.get();

    return 0;
}

C# class:

using System.Runtime.InteropServices;

namespace test {
    public class PILib {

        [DllImport( "piMath.dll", CallingConvention = CallingConvention.Cdecl)]
        public static extern int math_add( int _v1, int _v2);

    }
}

Calling in c#:

private void button1_Click( object sender, EventArgs e ) {
    int i = PILib.math_add( 3, 5 );

    MessageBox.Show( i.ToString() );
}

Output:

c# - How to call Min(), Max() on generic List

DateTime minStartTime = 
ListOfProcesesForKilling.Min( p => {        
  return p.StartTime;
} );
value += $"Min starttime: {minStartTime};";

c# - How to force JSON enum to save as TEXT instead of a NUMBER

This enum property:

public enum MinimizeActionEnum {
  NONE = 0,
  CLEAR = 1
}
    
public MinimizeActionEnum MinimizeAction { get; set; } = MinimizeActionEnum.NONE;

It is saved as INT by default:

"ReportParams": [
{
  "Name": "pProdId",
  "Description": "",
  "MinimizeAction": 0
},

With using that attribute:

[JsonConverter(typeof(JsonStringEnumConverter))]
public MinimizeActionEnum MinimizeAction { get; set; } = MinimizeActionEnum.NONE;

the enum value will be stored as TEXT:

"ReportParams": [
{
  "Name": "pProdId",
  "Description": "",
  "MinimizeAction": NONE
},

ssrs - How to make expression to get yesterday date

=DateAdd("d", -1, Today())

sql server - How to get detailed info about localdb

List of installed local DBs:

sqllocaldb i

Output:

MSSQLLocalDB

More details about selected:

sqllocaldb info MSSQLLocalDB

Output:

Name:               MSSQLLocalDB
Version:            15.0.4382.1
Shared name:
Owner:              domain\pirklj
Auto-create:        Yes
State:              Running
Last start time:    14.10.2025 14:36:27
Instance pipe name: np:\\.\pipe\LOCALDB#FF67DE7F\tsql\query

List of installed DBLocal versions:

sqllocaldb versions

Output:

Microsoft SQL Server 2016 (13.0.7037.1)
Microsoft SQL Server 2017 (14.0.3391.2)
Microsoft SQL Server 2019 (15.0.4382.1)
Microsoft SQL Server 2022 (16.0.1000.6)

Stopping and deleting of DBLocal instance, creating it with new higher version:

C:\Users\pirklj>sqllocaldb stop MSSQLLocalDB
LocalDB instance "MSSQLLocalDB" stopped.

C:\Users\pirklj>sqllocaldb delete MSSQLLocalDB
LocalDB instance "MSSQLLocalDB" deleted.

C:\Users\pirklj>sqllocaldb create MSSQLLocalDB
LocalDB instance "MSSQLLocalDB" created with version 16.0.1000.6.

C:\Users\pirklj>sqllocaldb start MSSQLLocalDB
LocalDB instance "MSSQLLocalDB" started.

c# - How to solve JSON deserialization problem

JSON deserialization returns this error:

Each parameter in the deserialization constructor on type 
'cieb_AXReportPrintDLG.ReportParamComboValues' must bind 
to an object property or field on deserialization. Each 
parameter name must match with a property or field on the 
object. Fields are only considered when 
'JsonSerializerOptions.IncludeFields' is enabled. 
The match can be case-insensitive.

All fields looks like OK. The problem is in the parameter names in the constructor. This version returns error:

public class ReportParamComboValues {

  /* description - for text */
  public string Description { get; set; }

  /* returned value for SSRS report param */
  public string Value { get; set; }

  public ReportParamComboValues( string _description, string _value ) {  
    this.Description = _description;
    this.Value = _value;
  }

}

This is working:

public class ReportParamComboValues {

  /* description - for text */
  public string Description { get; set; }

  /* returned value for SSRS report param */
  public string Value { get; set; }

  public ReportParamComboValues( string Description, string Value ) {  
    this.Description = Description;
    this.Value = Value;
  }

}

c# - How to solve problem with convension date into string with char "/" in format mask

This result can be obtained when trying to convert a date to a string using a format mask containing the character '/'.

DateTime dt = DateTime.Now;
MessageBox.Show( dt.ToString( "yyyy/MM/dd", CultureInfo.GetCultureInfo( "de-DE" ) ) );

Output:

2025.09.29

The solution is to change the Culture:

DateTime dt = DateTime.Now;
MessageBox.Show( dt.ToString( "yyyy/MM/dd", CultureInfo.GetCultureInfo( "en-US" ) ) );

Output:

2025/09/29

sql server - How to solve problem with CHARINDEX() - value subtraction

If you use this SQL code:

SUBSTRING( a.PackingSlipId, 1, CHARINDEX('-', a.PackingSlipId ) - 1 ) as document,

..you can get this error, even in a situation when CHARINDEX() returns valid values: Output:

Msg 537, Level 16, State 3, Line 1
Invalid length parameter passed to the LEFT or SUBSTRING function.

The solution is to use NULLIF() function:

SUBSTRING( a.PackingSlipId, 1, nullif( CHARINDEX('-', a.PackingSlipId ), 0 ) -1 ) as document,

ssrs - How to replace char with new row char

=Replace( Fields!Field.Value, ",", vbCrLf )

c# - How to add items to combobox with text description from attribute

Define new enum with attributes:

/* types for printing type combobox */
public enum PrintingTypeEnum
{
  [Description( "On screen" ) ]
  TO_SCREEN,
  [Description( "On printer" ) ]
  TO_PRINT
}

Fill the combobox with items:

CPrintingType.Items.Clear();
foreach (  PrintingTypeEnum item in Enum.GetValues( typeof( PrintingTypeEnum ) ) )
{
    string description = GetEnumDescription( item );
    CPrintingType.Items.Add( description );

    /* -- default value */  
    if ( item == PrintingTypeEnum.TO_PRINT )
    {
    	CPrintingType.SelectedIndex = CPrintingType.Items.Count - 1;
    }
}

private string GetEnumDescription( Enum _value )
{
    FieldInfo field = _value.GetType().GetField( _value.ToString() );
    DescriptionAttribute attribute = field?.GetCustomAttribute<DescriptionAttribute>();
    return attribute == null ? _value.ToString() : attribute.Description;
}

Output:

c# - EF - How to call storedproc with OUTPUT param

You have this stored proc:

ALTER PROCEDURE [dbo].[TEST]
	-- Add the parameters for the stored procedure here
( @Param1 int, @Message varchar(50) output )
AS
BEGIN
  set @Message = 'xxx';

  return '-1';
END

For calling it use this code:

var param1 = new SqlParameter( "Param1", System.Data.SqlDbType.Int );
param1.Direction = System.Data.ParameterDirection.Input;
param1.Value = iYear;

var message = new SqlParameter( "Message", System.Data.SqlDbType.VarChar, 50 ); 
message.Direction = System.Data.ParameterDirection.InputOutput;
message.Value = "";

var ret = context.Database.ExecuteSqlRaw(
  "EXEC TEST @Param1 = @param1, @Message = @message OUTPUT", param1, message
);

MessageBox.Show( message.Value.ToString() );
MessageBox.Show( ret.ToString() );

c# - EF - How to refresh existing DB into EF model

If you have DB and if you want to refresh it`s model into MODEL directory, call this:

dotnet ef dbcontext scaffold "Server=(LocalDB)\MSSQLLocalDB;
AttachDbFilename=C:\_projects\vs\FioTax\FioTax\db.mdf;
Integrated Security=True;Connect Timeout=30" Microsoft.EntityFrameworkCore.SqlServer 
--output-dir Models --context AppDbContext --force

sql server - How to run export script by sqlcmd

In command.sql is stored SQL select script, this calling performs it and save output to output.txt.

The param "-h -1" removes title row.

sqlcmd -S localhost\sqlexpress -d username -U sa -P password -h -1 -m 1 
-i "c:\dir\command.sql" -o "c:\dir\output\output.txt"

ax - How to check if the class is running in the batch mode ?

boolean bManualRunning = (BatchHeader::isExecutingInBatch() == false );

ax - How to find type used for specified Number Sequence ?

Searching for the data type for the sequence Time_6:

select datatypeid from NUMBERSEQUENCEDATATYPE
where
recid = 
  (
    select NUMBERSEQUENCEDATATYPE from NumberSequenceReference
    where
    NUMBERSEQUENCEID =
    (
      select recid from NumberSequencetable
      where
      NUMBERSEQUENCE = 'Time_6'
    )
)

Output:

datatypeid
-----------
8374

Then job in AX:

static void Job8(Args _args)
{
    info( extendedTypeId2name( 8374 ) );
}

Output:

SSRS - How to add stripline to chart

The stripline is in this example defined on X axis.

 

Remember: the value for StartWith is order of the axis value, not exact value (StartWidth):

=DatePart("ww", today(), FirstDayOfWeek.Monday, FirstWeekOfYear.System ) 
  -min(Fields!skp.Value)).

PS: Better variant is to use SSRS function CountDistinct() - solves problem with gaps in axis values:

=CountDistinct( IIF(Fields!skp.Value <= DatePart("ww", today(), 
FirstDayOfWeek.Monday, FirstWeekOfYear.System ), Fields!skp.Value, nothing) )

ax - How to get ItemId by ExternalItemId for specified customer

CustVendExternalItem custVendExternalItem;
ItemId itemId;
...
itemId = "";
custVendExternalItem = CustVendExternalItem::findExternalItemId( 
  ModuleInventPurchSalesVendCustGroup::Cust, "COMPANYID", sExternalItemId );
if ( custVendExternalItem != null ) itemId = custVendExternalItem.ItemId;

SSRS - How to get first and last day in month

These are useful functions, for example for parameter filling:

First and last day of this month:

=dateadd("m",0,dateserial(year(Today),month(Today),1))
=dateadd("m",1,dateserial(year(Today),month(Today),0))

First and last day of last month:

=dateadd("m",-1,dateserial(year(Today),month(Today),1))
=dateadd("m",0,dateserial(year(Today),month(Today),0))

First and last day of next month:

=dateadd("m",1,dateserial(year(Today),month(Today),1))
=dateadd("m",2,dateserial(year(Today),month(Today),0))

c - How to solve error UNRESOLVED EXTERNAL SYMBOL for static class field

.h

class OverloadedOperator {
public:
	
	string name;
	float price;
 
	static int n;
};

The problem could be in missing static field initialization in .cpp file. Should be:

.cpp

#include "OverloadedOperator.h"

int OverloadedOperator::n = 0;

sql server - How to check used count of decimal places in the field

select prodid, remaininventphysical,
len(replace( rtrim( replace( 
  convert( varchar, remaininventphysical), '0', ' ' ) ), ' ', '0' ) ) - 
charindex( '.', replace( rtrim( replace( 
  convert( varchar, remaininventphysical ), '0', ' ' ) ), ' ', '0' ) )
as nonzerodecimalplacesused
from PRODBOM
order by prodid;

Output:

prodid               remaininventphysical                    nonzerodecimalplacesused
-------------------- --------------------------------------- ------------------------
24-015377            0.0600060006000600                      14
24-015376            0.0800000000000000                      2
24-014563            0.0450045004500450                      15
24-013446            0.0450045004500450                      15
24-013445            0.0000000000000000                      0
24-011934            0.0000000000000000                      0
24-008828            0.0000000000000000                      0
24-008602            0.0000000000000000                      0
24-006598            0.0000000000000000                      0
23-039521            0.0000000000000000                      0

c_c++ - How to check DLL architecture (x86 vs x64)

From VS terminal run this command:

dumpbin /headers clib.dll

Output:

Dump of file clib.dll

PE signature found

File Type: DLL

FILE HEADER VALUES
            8664 machine (x64)
               A number of sections
        65FA9AE8 time date stamp Wed Mar 20 09:14:32 2024
               0 file pointer to symbol table
               0 number of symbols
              F0 size of optional header
            2022 characteristics
                   Executable
                   Application can handle large (>2GB) addresses
                   DLL

c_c++ - How to check entry points of the DLL

From VS terminal run this command:

dumpbin /exports clib.dll

Output, you can see two entry points:

Dump of file clib.dll

File Type: DLL

  Section contains the following exports for CLib.dll

    00000000 characteristics
    FFFFFFFF time date stamp
        0.00 version
           1 ordinal base
           2 number of functions
           2 number of names

    ordinal hint RVA      name

          1    0 00011249 add = @ILT+580(add)
          2    1 000110BE subtract = @ILT+185(subtract)

  Summary

        1000 .00cfg
        1000 .data
        1000 .idata
        1000 .msvcjmc
        3000 .pdata
        3000 .rdata
        1000 .reloc
        1000 .rsrc
        8000 .text
       10000 .textbss

c# - How to use LINQ aggregate() function

This calling performs SUM on Population (with starting value = 0.)

    
public List<Country> Countries = new();
...
this.Countries.Add( new Country( "Czech", Country.ContinentEnum.EUROPE, 10 ) );
this.Countries.Add( new Country( "Poland", Country.ContinentEnum.EUROPE, 40 ) );
this.Countries.Add( new Country( "China", Country.ContinentEnum.ASIA, 1100 ) );
this.Countries.Add( new Country( "USA", Country.ContinentEnum.AMERICA, 340 ) );
...
int total = this.Countries.Aggregate( 0, (total,b) => total + b.Population );

MessageBox.Show( total.ToString() );  // -> 1490

c# - How to call custom event

1) Custom event without parameters:

public Action OnBeforeEvaluationEvent;
...
if ( OnBeforeEvaluationEvent != null ) OnBeforeEvaluationEvent();

2) Custom event with parameter(s):

public delegate void OnAfterEvaluatingDelegate( CodeConditionGroup _conditionGroup );    
public event OnAfterEvaluatingDelegate OnAfterEvaluationgEvent;

if ( OnAfterEvaluationgEvent != null ) OnAfterEvaluationgEvent( condition );