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Home » Community » Coffee corner » operation with ascii table character (Pascal x C++/U++)
operation with ascii table character (Pascal x C++/U++) [message #56799] Sat, 17 April 2021 00:11 Go to next message
BetoValle is currently offline  BetoValle
Messages: 142
Registered: September 2020
Location: Brasil Valinhos SP
Experienced Member
Hi,

I'm trying to convert a routine from Pascal to U ++, which involves an operation with the number of the character in the ascii table. The problem is that in Pascal
a = ord (result [i]) = 97 , b = ord (result [i]) = 101
a xor b results 4 and this result in U ++ (a^b) is not
considered for screen printing or string accumulation: char(4)

in Pascal, char (4) is printed "x04"!

Do you have an equivalent routine?
How to solve? is there any way?

Thanks
Re: operation with ascii table character (Pascal x C++/U++) [message #56806 is a reply to message #56799] Sat, 17 April 2021 10:23 Go to previous messageGo to next message
Oblivion is currently offline  Oblivion
Messages: 928
Registered: August 2007
Experienced Contributor
Hello BetoValle,


	for(int i = 32; i < 128; ++i) {
		Cout() << "\t0x" << FormatIntHex(i, 2)
		       << "\t0x" << FormatIntHex(i + 1, 2)
		       << "\t0x" << FormatIntHex(i ^ (i + 1), 2) << "\n";
	}
	
	// OR

	Cout() << "\t-------------\n";
	
	for(int i = 32; i < 128; ++i) {
		Cout() << Format("\t0x%02x`\t0x%02x`\t0x%02x\n", i, i + 1, i ^ (i + 1));;
	}


Something like this?

You can use text formatting and/or formatters, as you can see in the above example.

Best regards,
Oblivion


[Updated on: Sat, 17 April 2021 10:27]

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Re: operation with ascii table character (Pascal x C++/U++) [message #56812 is a reply to message #56799] Sat, 17 April 2021 16:32 Go to previous messageGo to next message
BetoValle is currently offline  BetoValle
Messages: 142
Registered: September 2020
Location: Brasil Valinhos SP
Experienced Member
Hi Oblivion,

thanks, but that's not it. They are the unprinted characters from 1 to 32, encoded in pascal through its "chr" function. In the routine calculations are performed involving "xor" where the result will be the ascii character code from 1 to 255. If you in Pascal do the loop from 1 to 32 for example you will have results according to the array (if you paste these items the 1st vector below in the editor U ++, they will no longer be displayed)


Vector<String> arrAscii{ ""  ,""  ,""  ,""  ,""  ,""  ,""  ,""  ,"	"  ,"
"  ,""  ,""  ,"
"  ,""  ,""  ,""  ,""  ,""  ,""  ,""  ,""  ,""  ,""  ,""  ,""  ,""  ,""  ,""  ,""  ,""  ,""  ," " };

//if you print in a text editor example cudatext, or more sophisticated editor you will see the contents below

Vector<String> arrAscii{ "x01"  ,"x02"  ,"x03"  ,"x04"  ,"x05"  ,"x06"  ,"x07"  ,"x08"  ," "  
," "  ,"x0B"  ,"x0C"  ," "  ,"x0E"  ,"x0F"  ,"x10"  ,"x11"  ,"x12"  ,"x13"  ,
"x14"  ,"x15"  ,"x16"  ,"x17"  ,"x18"  ,"x19"  ,"x1A"  ,"x1B"  ,"x1C"  ,"x1D"  ,"x1E"  ,"x1F"  ," " };

CONSOLE_APP_MAIN
{
     String s;
     s << char(4);
     Cout()<< "show " <<  s  << EOL;   // not show!  
   
}


//pascal
procedure TForm2.SpeedButton1Click(Sender: TObject);
var
  log:String;
begin
  log := chr(4);
  showmessage( log );  // show ""
  ClipBoard.AsText := log ; // in text editor show "x04"
end; 





In pascal I can accumulate the characters 1 to 32 in the string using a loop
String [i] = chr (i)
but in U ++ I can't or if it exists then I haven't learned it yet.


Re: operation with ascii table character (Pascal x C++/U++) [message #56816 is a reply to message #56812] Sat, 17 April 2021 18:20 Go to previous messageGo to next message
Oblivion is currently offline  Oblivion
Messages: 928
Registered: August 2007
Experienced Contributor
Hello BetoValle,


I see. AFAIK there is no such formatter in U++ (it is too specific, IMO).

But it is easy to create one, using operator overloading, for example.

String& operator*(String& s, int c)
{
	if(c >= 0x20 && c <= 0x7E)
		s.Cat(c);
	else
		s << "0x" << FormatIntHex(c, c < 256 ? 2 : 4);
	return s;
}

String& operator*(String& s, const String& q)
{
	for(int c : q) s * c;
	return s;
}

CONSOLE_APP_MAIN
{
	Vector<String> v;
	for(int i = 0; i < 256; i++) v.Add() * i;
	Cout() << v.ToString();
	
}


Best regards,
Oblivion


[Updated on: Sat, 17 April 2021 18:22]

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Re: operation with ascii table character (Pascal x C++/U++) [message #56820 is a reply to message #56816] Sat, 17 April 2021 22:05 Go to previous messageGo to next message
mirek is currently offline  mirek
Messages: 13442
Registered: November 2005
Ultimate Member
Oblivion wrote on Sat, 17 April 2021 18:20
Hello BetoValle,


I see. AFAIK there is no such formatter in U++ (it is too specific, IMO).

But it is easy to create one, using operator overloading, for example.

String& operator*(String& s, int c)
{
	if(c >= 0x20 && c <= 0x7E)
		s.Cat(c);
	else
		s << "0x" << FormatIntHex(c, c < 256 ? 2 : 4);
	return s;
}

String& operator*(String& s, const String& q)
{
	for(int c : q) s * c;
	return s;
}

CONSOLE_APP_MAIN
{
	Vector<String> v;
	for(int i = 0; i < 256; i++) v.Add() * i;
	Cout() << v.ToString();
	
}


Best regards,
Oblivion


BTW, Format is extensible, so you can in fact add this somewhat weird formatter to Format..
Re: operation with ascii table character (Pascal x C++/U++) [message #56823 is a reply to message #56812] Sat, 17 April 2021 23:37 Go to previous messageGo to next message
zsolt is currently offline  zsolt
Messages: 629
Registered: December 2005
Location: Budapest, Hungary
Contributor
You don't need this in C++ and you can add any non printable characters to U++ strings:
CONSOLE_APP_MAIN
{
     String s;
     s << (char)4;
     Cout()<< "show " <<  s  << EOL;   // not show!  
   
}

It will not be shown on terminal, but if you redirect the output to a file, it will be there.
./your_program > your_file.txt

or
your_program.exe > your_file.txt

Re: operation with ascii table character (Pascal x C++/U++) [message #56825 is a reply to message #56799] Sun, 18 April 2021 00:12 Go to previous message
BetoValle is currently offline  BetoValle
Messages: 142
Registered: September 2020
Location: Brasil Valinhos SP
Experienced Member
Hi,

I thank you all very much. The routine was this low, of simple encryption. To decrypt the function is the same. The issue of content resulting from encryption does not need to be displayed (internally the contents are stored, for example in the database) and when decrypting the content recovery, it is correct and logically visible. Only that the function can be improved, but it is a my start.

"mStr" is content you want to encrypt
"mchave" is encryption key content

                          
String Criptografia(String mStr, String mChave)
{
  String s;
  int pos,posLetra;
  mChave=mChave;
  int TamanhoString = mStr.GetLength();
  int TamanhoChave = mChave.GetLength();

  for(int i = 0; i < TamanhoString; i++){
    pos = (i % TamanhoChave);  
    
    if( pos == 0)
      pos = TamanhoChave;
    
    int a = mStr[i];
    int b = mChave[pos];
    
    posLetra = a ^ b;

    if (posLetra == 0)
      posLetra = mStr[i];
    s << char(posLetra);
  }
  return s;
}


CONSOLE_APP_MAIN
{
	//first time you encripts
	String a=Criptografia("José da Silva","efg");
	//second time you decrips
	String b=Criptografia(a,"efg");
        Cout()<< b << EOL;	
}

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