I am receiving data into an array from the energy meters which is of REAL datatype.
My array: ARRAY[0..49] OF Real;
I want to convert this data into string data type like i want all the values enclosed in commas "" separately.
Waiting for your kind responce.
(*Declaration part*)
aMyStringArray : ARRAY[0..49] OF STRING;
aMyRealArray : ARRAY[0..49] OF REAL;
i : INT;
sMyLongString : STRING(50*255);
(*Implementation part*)
sMyLongString := '';
FOR i:=0 TO 49 DO
aMyStringArray[i] := REAL_TO_STRING(aMyRealArray[i]);
sMyLongString := CONCAT(sMyLongString,'"');
sMyLongString := CONCAT(sMyLongString,aMyStringArray[i]);
sMyLongString := CONCAT(sMyLongString,'"');
sMyLongString := CONCAT(sMyLongString,',');
END_FOR
Related
I am very new to structured text, so pardon my simple question.
I am using OpenPLC to create this simple program. I have been following the example from the link below to create flowing lights simple program with structured text. In this video, they used 5LEDs and controlled it with case statements.
However, my question is, if my program needs to turn on 100 lights, how should I change the code?
Should I use for loops? How?
https://www.youtube.com/watch?v=PXnaULHpxC8&t=25s
Yes you can use for loops etc. to make the program more "dynamic".
Unfortunately most of the PLC's don't give you dynamic access to their digital outputs. This means that at the end you will have to write code that will translate the value from array (which you will be looping through) into digital outputs.
There are a few ways to do that. First let me show how you can create chasing light for up to 16.
PROGRAM PLC_PRG
VAR
iNumOfLights : INT := 6;
fbCounter : CTU := ;
fbTicker : BLINK := (ENABLE := TRUE, TIMELOW := T#100MS, TIMEHIGH := T#1S);
wOut: WORD;
END_VAR
fbTicker();
fbCounter(CU := fbTicker.OUT, RESET := fbCounter.Q, PV := iNumOfLights);
wOut := SHL(2#0000_0000_0000_0001, fbCounter.CV);
A := wOut.0;
B := wOut.1;
C := wOut.2;
D := wOut.3;
E := wOut.4;
F := wOut.5;
G := wOut.6;
END_PROGRAM
Or if you know output address you can do it directly to outputs.
PROGRAM PLC_PRG
VAR
iNumOfLights : INT := 6;
fbCounter : CTU := ;
fbTicker : BLINK := (ENABLE := TRUE, TIMELOW := T#100MS, TIMEHIGH := T#1S);
wOut AT %QB0.1: WORD;
END_VAR
fbTicker();
fbCounter(CU := fbTicker.OUT, RESET := fbCounter.Q, PV := iNumOfLights);
wOut := SHL(2#0000_0000_0000_0001, fbCounter.CV);
END_PROGRAM
You can also change type of chasing lights by something like.
IF fbCounter.CV = 0 THEN
wOut := 0;
END_IF;
wOut := wOut OR SHL(2#0000_0000_0000_0001, fbCounter.CV);
Now what is behind this. SHl operator will move 1 to the left on set number. For example SHL(2#0000_0000_0000_0001, 3) will result in 2#0000_0000_0000_1000. So we assign it to wOut and then access individual bits by wOut.[n].
I have created a REST server in Delphi using WebBroker. My intention is to use it as a label printer. A client prepares and sends a JSON request detailing the printer name, Fast Report & variables. The server reads the JSON, creates a tFrxReport object loads the requisite report and populates the variables.
This all works admirably, except it will not print to a physical printer. If I select OneNote as my destination, the label is saved to the desktop. If I select a network attached printer, no label emerges.
I have tried PrintOptions.ShowDialog:=True The print dialog shows, indicating the correct printer, but it does not print.
If anyone has any experience, could you point me in the right direction please?
function processJson(itm : sat; jtr : tJsonTextReader): sat;
var
idx : integer;
//itm : sat; // simple array type [idx, 'val1', 'val2']
begin
setlength(itm,0);
idx:=0;
while jtr.Read do
begin
if jtr.TokenType = tJsonToken.PropertyName then
begin
setlength(itm, length(itm)+1);
itm[idx].st_idx := idx;
itm[idx].st_code := jtr.Value.ToString; // property name
jtr.Read;
itm[idx].st_desc := jtr.Value.AsString; // property value
inc(idx);
end;
end;
processJson := itm;
end;
function getPrinterInfo(pnam: string):printinfo_type;
var
ptr : printinfo_type;
idx : integer;
begin
ptr.idx := -1; //default printer
ptr.name := trim(pnam);
for idx := 0 to Printer.Printers.Count - 1 do
if AnsiContainsText(Printer.Printers[idx], ptr.name) then
ptr.idx := idx;
result := ptr;
end;
procedure Ttfdq.tfdqactLabelAction(Sender: TObject; Request: TWebRequest;
Response: TWebResponse; var Handled: Boolean);
var
post : simpleArray_type;
pdx, idx, iitm : integer;
jtr : tJsonTextReader;
sr : tStringReader;
pish : string;
fr : tFrxReport;
thePtr : printinfo_type;
itm : sat;
tstprt : boolean;
begin
d.myHost := 'http://' + Request.host + ':' + intToStr(Request.ServerPort);
d.hostIP := Request.host;
d.Request := Request;
d.Response := Response;
d.remAddr := Request.RemoteAddr;
post := explode(Request.Content);
tstprt := false;
pdx := isset(post, 'json');
pish:='';
if (pdx >=0) then
begin
sr := tStringReader.Create(post[pdx].st_desc);
jtr := tJsonTextReader.Create(sr);
while jtr.read do
begin
if jtr.TokenType = tJsonToken.StartObject then
itm := processJson(itm, jtr);
end;
if fileexists(itm[2].st_desc) then
begin
thePtr := getPrinterInfo(itm[1].st_desc);
fr := tFrxReport.Create(nil);
fr.LoadFromFile(itm[2].st_desc);
// pre load any vars so report does not fail
for idx := 0 to fr.Variables.Count-1 do
fr.Variables.Items[iitm].Value := frText('');
for idx := 4 to High(itm) do
begin
pish := pish + 'index of '+itm[idx].st_code+' = '+ intToStr (fr.Variables.IndexOf(itm[idx].st_code))+'<br>';
iitm := fr.Variables.IndexOf(itm[idx].st_code);
if iitm > -1 then
fr.Variables.Items[iitm].Value := frText(itm[idx].st_desc);
end;
if fr.PrepareReport then
begin
//fr.ShowPreparedReport;
fr.PrintOptions.Printer := thePtr.name;
fr.PrintOptions.PrnOutFileName := 'Trace Label';
fr.PrintOptions.ShowDialog := tstprt;
fr.ShowProgress := tstprt;
fr.Print;
end;
fr.Free;
end;
Response.Content := pish ;
end
else
begin
Response.Content := '<html>' +
'<head><title>Label List</title></head>' +
'<body>This is only used by print serve clients</p>'+
'</body>' +
'</html>';
end;
end;
The problem lies here:
fr.PrintOptions.PrnOutFileName := 'Trace Label';
I erroneously thought that would add a description in the print queue. What it actually did is send the report into limbo :)
I have an array of a structure: myStructure[0..100]
I would like to index that structure by name.
It works by giving each index a name:
P101_AI := 9
P102_AI := 10
P103_AI := 11
P104_AI := 12
So indexing a member in the structure: myStructure[P103_AI].value (i.e. indexing myStructure[11].value)
However, is it possible to index this indirectly?
i.e. if delcaring TempString : STRING[30];
altering TempString at runtime to index the array.
Here is some pseudocade to describe what I would like to do:
FOR i:=101 TO 104 DO
TempString := CONCAT('P',i);
TempString := CONCAT(TempString,'_AI');
MyStructure[ indirect(TempString)].value := 'some value';
END_FOR;
What about creating an enum?
{attribute 'qualified_only'}
TYPE E_AnalogInput :
(
P101_AI := 9,
P102_AI,
P103_AI,
P104_AI
);
END_TYPE
Then you can declare:
analogInputs : ARRAY[E_AnalogInput.P101_AI..E_AnalogInput.P104_AI] OF INT;
Running a for loop:
FOR inputCount:=E_AnalogInput.P101_AI TO E_AnalogInput.P104_AI BY 1 DO
//Do something
END_FOR
Hope this helps
I would use pointers and mapping. First, change your structure to the pointer.
TYPE MyType: STRUCT
input: POINTER TO INT;
value: INT;
// other properties
END_STRUCT
END_TYPE
Then, create a global array.
VAR_GLOBAL
MyStructure: ARRAY[1..100] OR MyType;
END_VAR
Now in a program create one time running code.
PROGRAM PLC_PRG:
VAR
xInit:= FALSE;
END_VAR
IF NOT xInit THEN
xInit := TRUE;
mMap();
END_IF
END_PROGRAM
Now in a method or action mMap do this for every array element.
MyStructure[1].input:= ADR(AI_Name);
MyStructure[2].input:= ADR(P102_AI);
MyStructure[3].input:= ADR(%ID0.1);
I used 3 different ways to bind pointer. The order is not important I think. Then in a program, you can do this.
FOR i := 1 TO 100 DO
MyStructure[i].value := 'MyStructure[i].input^;
END_FOR;
This is how i solved it.
TYPE infoType: STRUCT
name: STRING[20];
END_STRUCT
END_TYPE
TYPE sensorType: STRUCT
value: INT;
info: infoType;
END_STRUCT
END_TYPE
TYPE IO_Type: STRUCT
AI: ARRAY[1..100] OF sensorType;
END_STRUCT
END_TYPE
TYPE E_AnalogInput :
(
P101_AI := 9,
P102_AI,
P103_AI,
P104_AI
);
END_TYPE
PROGRAM PLC_PRG:
VAR
IOs: IO_Type;
END_VAR
IOs.AI[P101_AI].info.name := 'P101_AI';
FOR i:=101 TO 104 DO
TempString := CONCAT('P',i);
TempString := CONCAT(TempString,'_AI');
FOR i:=0 TO SIZE_OF(ADR(IOs.AI)) / SIZE_OF(ADR(IOs.AI[0])) DO
IF TempString = IOs.AI[i].info.name THEN
IOs.AI[i].value := 123; // Some value
EXIT;
END_IF;
END_FOR;
END_FOR;
END_PROGRAM
So I need to understand what this code is doing. I don't know pascal or cryptography, and am struggling to understand what is going on in here. I need to reverse engineer SHA1DigestToHex into scala and am totally lost beyond learning pascal. Can you tell me what this function is doing? Or how I can go about figuring it out?
Function SHA1DigestToHex (const Digest : T160BitDigest) : String;
Begin
Result := DigestToHex (Digest, Sizeof (Digest));
End;
Function DigestToHex (const Digest; const Size : Integer) : String;
Begin
SetLength (Result, Size * 2);
DigestToHexBuf (Digest, Size, Pointer (Result)^);
End;
Procedure DigestToHexBuf (const Digest; const Size : Integer; const Buf);
const s_HexDigitsLower : String [16] = '0123456789abcdef';
var I : Integer;
P : PChar;
Q : PByte;
Begin
P := #Buf;;
Assert (Assigned (P), 'Assigned (Buf)');
Q := #Digest;
Assert (Assigned (Q), 'Assigned (Digest)');
For I := 0 to Size - 1 do
begin
P^ := s_HexDigitsLower [Q^ shr 4 + 1];
Inc (P);
P^ := s_HexDigitsLower [Q^ and 15 + 1];
Inc (P);
Inc (Q);
end;
End;
UPDATE
type
PByte = ^Byte;
PWord = ^Word;
PLongWord = ^LongWord;
T128BitDigest = record
case integer of
0 : (Int64s : Array [0..1] of Int64);
1 : (Longs : Array [0..3] of LongWord);
2 : (Words : Array [0..7] of Word);
3 : (Bytes : Array [0..15] of Byte);
end;
P128BitDigest = ^T128BitDigest;
T160BitDigest = record
case integer of
0 : (Longs : Array [0..4] of LongWord);
1 : (Words : Array [0..9] of Word);
2 : (Bytes : Array [0..19] of Byte);
end;
P160BitDigest = ^T160BitDigest;
const
MaxHashDigestSize = Sizeof (T160BitDigest);
Procedure DigestToHexBuf (const Digest; const Size : Integer; const Buf);
Function DigestToHex (const Digest; const Size : Integer) : String;
Function Digest128Equal (const Digest1, Digest2 : T128BitDigest) : Boolean;
Function Digest160Equal (const Digest1, Digest2 : T160BitDigest) : Boolean;
It merely converts the bytes of the binary buffer passed in as Buf into a string of hexadecimal digits representing the same bytes in Digest.
So e.g. if Buf is the byte array (0x12, 0x34, 0x56), then afterwards Digest will be '123456'.
Here's a simpler Pascal (Delphi) version that does the same thing:
function SHA1DigestToHex2(const Digest : T160BitDigest) : string;
const s_HexDigitsLower : array[0..15] of char = '0123456789abcdef';
var
i, j: Integer;
Begin
SetLength(Result, sizeof(Digest) * 2);
i := 1;
j := 0;
while j < sizeof(Digest) do begin
Result[i] := s_HexDigitsLower[Digest.Bytes[j] shr 4];
Result[i+1] := s_HexDigitsLower[Digest.Bytes[j] and $F];
inc(i, 2);
inc(j);
end;
End;
Using: Lazarus 1.2.0; Windows 32-bit application
I have created a custom component derived from TCustomPanel and contains some TEdit controls.
At runtime, when I try to set the Text property of an edit control in my component, I get a runtime error.
This is the error:
Project project1 raised exception class 'External: SIGSEGV'.
In file '.\include\control.inc' at line 3246:
GetTextMethod := TMethod(#Self.GetTextBuf);
I Googled and could not find anybody else reporting this error specifically when setting the Text property of TEdit.
This leads me to believe that I did something wrong when writing the component. Please check my code and point out what is wrong and how to fix it. TIA!
Code follows:
unit uEditPanel;
{$mode objfpc}{$H+}
interface
uses
Classes, SysUtils, LResources, Forms, Controls, Graphics, Dialogs, ExtCtrls, StdCtrls;
type
{ TEditPanel }
TEditPanel = class(TCustomPanel)
Edit0: TCustomEdit;
Edit1: TCustomEdit;
Edit2: TCustomEdit;
Edit3: TCustomEdit;
Edit4: TCustomEdit;
private
{ Private declarations }
function GetEdit0Text: string;
procedure SetEdit0Text(AText: string);
function GetEdit1Text: string;
procedure SetEdit1Text(AText: string);
function GetEdit2Text: string;
procedure SetEdit2Text(AText: string);
function GetEdit3Text: string;
procedure SetEdit3Text(AText: string);
function GetEdit4Text: string;
procedure SetEdit4Text(AText: string);
protected
{ Protected declarations }
public
{ Public declarations }
procedure CreateWnd; override;
published
{ Published declarations }
property Edit0Text: string read GetEdit0Text write SetEdit0Text;
property Edit1Text: string read GetEdit1Text write SetEdit1Text;
property Edit2Text: string read GetEdit2Text write SetEdit2Text;
property Edit3Text: string read GetEdit3Text write SetEdit3Text;
property Edit4Text: string read GetEdit4Text write SetEdit4Text;
end;
procedure Register;
implementation
procedure Register;
begin
RegisterComponents('Standard', [TEditPanel]);
end;
{ TEditPanel }
function TEditPanel.GetEdit0Text: string;
begin
Result := Edit0.Text;
end;
procedure TEditPanel.SetEdit0Text(AText: string);
begin
Edit0.Text := AText;
end;
function TEditPanel.GetEdit1Text: string;
begin
Result := Edit1.Text;
end;
procedure TEditPanel.SetEdit1Text(AText: string);
begin
Edit1.Text := AText;
end;
function TEditPanel.GetEdit2Text: string;
begin
Result := Edit2.Text;
end;
procedure TEditPanel.SetEdit2Text(AText: string);
begin
Edit2.Text := AText;
end;
function TEditPanel.GetEdit3Text: string;
begin
Result := Edit3.Text;
end;
procedure TEditPanel.SetEdit3Text(AText: string);
begin
Edit3.Text := AText;
end;
function TEditPanel.GetEdit4Text: string;
begin
Result := Edit4.Text;
end;
procedure TEditPanel.SetEdit4Text(AText: string);
begin
Edit4.Text := AText;
end;
procedure TEditPanel.CreateWnd;
begin
inherited CreateWnd;
Caption := EmptyStr;
Height := 117;
Width := 289;
BevelOuter := bvNone;
ClientHeight := 117;
ClientWidth := 289;
Edit0 := TCustomEdit.Create(Self);
Edit1 := TCustomEdit.Create(Self);
Edit2 := TCustomEdit.Create(Self);
Edit3 := TCustomEdit.Create(Self);
Edit4 := TCustomEdit.Create(Self);
Edit0.Left := 0;
Edit0.Height := 21;
Edit0.Top := 0;
Edit0.Width := 288;
//Edit0.BorderStyle := bsNone;
Edit0.TabOrder := 0;
Edit1.Left := 0;
Edit1.Height := 21;
Edit1.Top := 24;
Edit1.Width := 288;
// Edit1.BorderStyle := bsNone;
Edit1.TabOrder := 1;
Edit1.Font.Color := clGray;
Edit2.Left := 0;
Edit2.Height := 21;
Edit2.Top := 48;
Edit2.Width := 288;
// Edit2.BorderStyle := bsNone;
Edit2.TabOrder := 2;
Edit2.Font.Color := clGray;
Edit3.Left := 0;
Edit3.Height := 21;
Edit3.Top := 72;
Edit3.Width := 288;
//Edit3.BorderStyle := bsNone;
Edit3.TabOrder := 3;
Edit3.Font.Color := clGray;
Edit4.Left := 0;
Edit4.Height := 21;
Edit4.Top := 96;
Edit4.Width := 288;
//Edit4.BorderStyle := bsNone;
Edit4.TabOrder := 4;
Edit4.Font.Color := clGray;
Edit0.Parent := Self;
Edit1.Parent := Self;
Edit2.Parent := Self;
Edit3.Parent := Self;
Edit4.Parent := Self;
Edit0.SetSubComponent(True);
Edit1.SetSubComponent(True);
Edit2.SetSubComponent(True);
Edit3.SetSubComponent(True);
Edit4.SetSubComponent(True);
end;
end.
Solved. Answer posted by user JuhaManninen on the Lazarus support forum:
"You have no constructor in your class. Replace CreateWnd with a
constructor."