Compare byte array to ansichar

[karl Jonson 0]

Hi,
I would like to compare byte array to ansichar.
 

If MyByteArray = MyansiChar then  
  ...

Which is the best method to do that ?

TA

Edited November 10, 2020 by karl Jonson
spelling

[David Heffernan 2345]

Can you be precise about the types here. At the moment all we know is the name of the variables. 

[karl Jonson 0]

7 minutes ago, David Heffernan said:

Can you be precise about the types here. At the moment all we know is the name of the variables. 

The types used are:

array[0..12] of Byte
system.ansichar

 

TA

[Anders Melander 1782]

Assuming you meant AnsiString and not AnsiChar (it doesn't make sense to compare 13 bytes to 1 ansichar):

function Compare(const Bytes: TByteArray; const Str: AnsiString): boolean;
begin
  Result := (Length(Str) = SizeOf(Bytes)) and (CompareMem(@Str[1], @Bytes[0], SizeOf(Bytes));
end;

[karl Jonson 0]

26 minutes ago, Anders Melander said:

Assuming you meant AnsiString and not AnsiChar (it doesn't make sense to compare 13 bytes to 1 ansichar):

function Compare(const Bytes: TByteArray; const Str: AnsiString): boolean;
begin
  Result := (Length(Str) = SizeOf(Bytes)) and (CompareMem(@Str[1], @Bytes[0], SizeOf(Bytes));
end;

Thanks.

It's ansichar type.

I need to check if MyByteArray = MyansiChar (eg. control character EOT)

[Anders Melander 1782]

1 minute ago, karl Jonson said:

It's ansichar type

I need to check if MyByteArray = MyansiChar (eg. control character EOT)

As I wrote you cannot compare a byte (ansichar) to 13 bytes (byte array) for equality. Since the size is different they will always be different, so what you're asking isn't making sense.

 

Are you trying to determine if the byte array contains the ansichar?

function Contains(const Bytes: TByteArray; c: AnsiChar): boolean;
begin
  for var b in Bytes do
    if (b = Ord(c)) then
      Exit(True);
  Result := False;
end;

 

[David Heffernan 2345]

Can you describe how you want to perform this comparison? How you want to compare the 13 bytes in the array with the single byte in the AnsiChar variable.