Come assegnare un valore di stringa su più righe senza virgolette su ogni riga?

Question

C'è un modo per assegnare un valore di stringa multilinea in Delphi senza dover citare ogni riga?

Modifica (il problema specifico):Ho alcune query SQL che voglio testare fuori Delphi.Quando si copiano le query è un po' dispendioso aggiungere e sostituire le virgolette ogni volta.

Answer 1

Ecco il codice per un'applicazione è possibile aggiungere al menu Strumenti del IDE che potrebbe aiutare. E 'stato pubblicato un po' indietro a uno dei gruppi di discussione CodeGear per utente TeamB Peter In basso:

program ClipToStringConst;

// Remove the dot from the line below for a console app, 
// per Rob Kennedy's comment. It works fine without being
// a console app.
{.$APPTYPE CONSOLE}
uses
  Windows,
  Classes,
  Sysutils,
  APIClipboard;

const
  cIndent = '  '; // 2 spaces
  cSingleQuote = '''';
  EndChar : array [Boolean] of Char = ('+',';');

procedure Process;
var
  SL: TStringlist;
  i, max: Integer;
begin
  if ClipboardHasFormat( CF_TEXT ) then
  begin
    SL := TStringlist.Create;
    try
      SL.Text := ClipboardAsString;
      max := SL.count-1;
      for i:= 0 to max do
        SL[i] := cIndent +
                 AnsiQuotedStr( TrimRight(SL[i])+#32, cSingleQuote ) +
                 EndChar[i = max];
      StringToClipboard( SL.Text );
    finally
      SL.Free;
    end; { Finally }
  end;
end;

begin
  try
    Process;
  except
    on E: Exception do
      ShowException( E, ExceptAddr );
  end;
end.

Basta selezionare il testo nello strumento di gestione di SQL dopo aver testato e copiarlo negli appunti. Passare alla Delphi Code Editor, posizionare il punto di inserimento in cui si desidera visualizzare il testo costante, scegliere 'Appunti Per Const' o qualsiasi altra cosa che hai chiamato dal menu Strumenti, e poi Ctrl + V per incollare nell'editor.

E 'un piccolo strumento piuttosto utile. È inoltre possibile modificare per lavorare nel modo opposto (ConstantToClipboard) per rimuovere la formattazione originale e tornare a SQL prime, anche se non ho preso la briga di farlo ancora.

EDIT: Missed un'unità (APIClipboard). Questo deve essere un'unità separata, ovviamente. Ancora una volta, grazie a Peter seguito:

{== Unit APIClipboard =================================================}
{: Clipboard access routines using only API functions
@author Dr. Peter Below
@desc Version 1.0 created 5 Juli 2000<BR>
        Current revision 1.0<BR>
        Last modified 5 Juli 2000<P>

This unit provides simply clipboard access routines that do not rely on
the VCL Clipbrd unit. That unit drags in Dialogs and Forms and a major
part of the VCL as a consequence, not appropriate for simple console
or non-form programs. This unit uses only API routines, the only VCL
units used are Classes (for exceptions and streams) and SysUtils.
}
{=====================================================================}

unit APIClipboard;

interface

uses
  Windows, Classes;

  procedure StringToClipboard( const S: String );
  function ClipboardAsString: String;
  procedure CopyDataToClipboard( fmt: DWORD; const data; datasize: Integer;
                                 emptyClipboardFirst: Boolean = true );
  procedure CopyDataFromClipboard( fmt: DWORD; S: TStream );
  function ClipboardHasFormat( fmt: DWORD ): Boolean;

implementation

uses
  Sysutils;

type
  {: This is an internal exception class used by the <see unit=APIClipboard> }
  EClipboardError = class( Exception )
  public
    constructor Create( const msg: String );
  end;

resourcestring
  eSystemOutOfMemory =
    'could not allocate memory for clipboard data.';
  eLockfailed =
    'could not lock global memory handle.';
  eSetDataFailed =
    'could not copy data block to clipboard.';
  eCannotOpenClipboard =
    'could not open the clipboard.';
  eErrorTemplate =
    'APIClipboard: %s'#13#10+
    'System error code: %d'#13#10+
    'System error message: %s';

{-- EClipboardError.Create --------------------------------------------}
{: Creates a new EclipboardError object
@Param msg is the string to embed into the error message
@Precondition none
@Postcondition none
@desc Composes an error message that contains the passed message and the
  API error code and matching error message. The CreateFmt constructor
  inherited from the basic Exception class is used to do the work.
Created 5.7.2000 by P. Below
}{---------------------------------------------------------------------}

constructor EClipboardError.Create( const msg: String );
begin { Create }
  CreateFmt( eErrorTemplate,
               [msg, GetLastError, SysErrorMessage(GetLastError)] );
end; { EClipboardError.Create }

{-- DataToClipboard ---------------------------------------------------}
{: Copies a block of memory to the clipboard in a given format
@Param fmt is the clipboard format to use
@Param data is an untyped const parameter that addresses the data to copy
@Param datasize is the size of the data, in bytes
@Precondition The clipboard is already open. If not an EClipboardError
  will result. This precondition cannot be asserted, unfortunately.
@Postcondition Any previously exisiting data of this format will have
  been replaced by the new data, unless datasize was 0 or we run into an
  exception. In this case the clipboard will be unchanged.
@desc Uses API methods to allocate and lock a global memory block of
  approproate size, copies the data to it and submits the block to the
  clipboard. Any error on the way will raise an EClipboardError
  exception.<BR>
Created 5.7.2000 by P. Below
@Raises EClipboardError
}{---------------------------------------------------------------------}

procedure DataToClipboard( fmt: DWORD; Const data; datasize: Integer );
var
  hMem: THandle;
  pMem: Pointer;
begin { DataToClipboard }
  if datasize <= 0 then
    Exit;

  hMem := GlobalAlloc( GMEM_MOVEABLE or GMEM_SHARE or GMEM_ZEROINIT, datasize );
  if hmem = 0 then
    raise EClipboardError.Create( eSystemOutOfMemory );

  pMem := GlobalLock( hMem );
  if pMem = nil then
  begin
    GlobalFree( hMem );
    raise EClipboardError.Create( eLockFailed );
  end;

  Move( data, pMem^, datasize );
  GlobalUnlock( hMem );
  if SetClipboardData( fmt, hMem ) = 0 then
    raise EClipboardError( eSetDataFailed );

  // Note: API docs are unclear as to whether the memory block has
  // to be freed in case of failure. Since failure is unlikely here
  // lets blithly ignore this issue for now.
end; { DataToClipboard }

{-- DataFromClipboard -------------------------------------------------}
{: Copies data from the clipboard into a stream
@Param fmt is the clipboard format to look for
@Param S is the stream to copy to
@precondition S <> nil
@postcondition If data was copied the streams position will have moved
@desc Tries to get a memory block for the requested clipboard format.
Nothing
  further is done if this fails (because the format is not available or
  the clipboard is not open, we treat neither as error here), otherwise
  the memory handle is locked and the data copied into the stream. <P>
  Note that we cannot determine the actual size of the data originally
  copied to the clipboard, only the allocated size of the memory block!
  Since GlobalAlloc works with a granularity of 32 bytes the block may be
  larger than required for the data and thus the stream may contain some
  spurious bytes at the end. There is no guarantee that these bytes will
  be 0. <P>
  If the memory handle obtained from the clipboard cannot be locked we
  raise an <see class=EClipboardError> exception.
Created 5.7.2000 by P. Below
@Raises EClipboardError
}{---------------------------------------------------------------------}

procedure DataFromClipboard( fmt: DWORD; S: TStream );
var
  hMem: THandle;
  pMem: Pointer;
  datasize: DWORD;
begin { DataFromClipboard }
  Assert( Assigned( S ));
  hMem := GetClipboardData( fmt );
  if hMem <> 0 then
  begin
    datasize := GlobalSize( hMem );
    if datasize > 0 then
    begin
      pMem := GlobalLock( hMem );
      if pMem = nil then
        raise EclipboardError.Create( eLockFailed );
      try
        S.WriteBuffer( pMem^, datasize );
      finally
        GlobalUnlock( hMem );
      end;
    end;
  end;
end; { DatafromClipboard }

{-- CopyDataToClipboard -----------------------------------------------}
{: Copies a block of memory to the clipboard in a given format
@Param fmt is the clipboard format to use
@Param data is an untyped const parameter that addresses the data to copy
@Param datasize is the size of the data, in bytes
@Param emptyClipboardFirst determines if the clipboard should be emptied,
  true by default
@Precondition The clipboard must not be open already
@Postcondition If emptyClipboardFirst is true all prior data will be
  cleared from the clipboard, even if datasize is <= 0. The clipboard
  is closed again.
@desc Tries to open the clipboard, empties it if required and then tries to
  copy the passed data to the clipboard. This operation is a NOP if
  datasize <= 0. If the clipboard cannot be opened a <see
class=EClipboardError>
  is raised.
Created 5.7.2000 by P. Below
@Raises EClipboardError
}{---------------------------------------------------------------------}

procedure CopyDataToClipboard( fmt: DWORD; const data; datasize: Integer;
                               emptyClipboardFirst: Boolean = true );
begin { CopyDataToClipboard }
  if OpenClipboard( 0 ) then
    try
      if emptyClipboardFirst then
        EmptyClipboard;
      DataToClipboard( fmt, data, datasize );
    finally
      CloseClipboard;
    end
  else
    raise EclipboardError.Create( eCannotOpenClipboard );
end; { CopyDataToClipboard }

{-- StringToClipboard -------------------------------------------------}
{: Copies a string to clipboard in CF_TEXT clipboard format
@Param S is the string to copy, it may be empty.
@Precondition The clipboard must not be open already.
@Postcondition Any prior clipboard content will be cleared, but only
  if S was not empty. The clipboard is closed again.
@desc Hands the brunt of the work off to <See routine=CopyDataToClipboard>,
  but only if S was not empty. Otherwise nothing is done at all.<BR>
Created 5.7.2000 by P. Below
@Raises EClipboardError
}{---------------------------------------------------------------------}

procedure StringToClipboard( const S: String );
begin
  if Length(S) > 0 Then
    CopyDataToClipboard( CF_TEXT, S[1], Length(S)+1);
end; { StringToClipboard }

{-- CopyDataFromClipboard ---------------------------------------------}
{: Copies data from the clipboard into a stream
@Param fmt is the clipboard format to look for
@Param S is the stream to copy to
@Precondition S <> nil<P>
  The clipboard must not be open already.
@Postcondition If data was copied the streams position will have moved.
  The clipboard is closed again.
@desc Tries to open the clipboard, and then tries to
  copy the data to the passed stream. This operation is a NOP if
  the clipboard does not contain data in the requested format.
  If the clipboard cannot be opened a <see class=EClipboardError>
  is raised.
Created 5.7.2000 by P. Below
@Raises EClipboardError
}{---------------------------------------------------------------------}

procedure CopyDataFromClipboard( fmt: DWORD; S: TStream );
begin { CopyDataFromClipboard }
  Assert( Assigned( S ));
  if OpenClipboard( 0 ) then
    try
      DataFromClipboard( fmt , S );
    finally
      CloseClipboard;
    end
  else
    raise EclipboardError.Create( eCannotOpenClipboard );
end; { CopyDataFromClipboard }

{-- ClipboardAsString -------------------------------------------------}
{: Returns any text contained on the clipboard
@Returns the clipboards content if it contained something in CF_TEXT
  format, or an empty string.
@Precondition The clipboard must not be already open
@Postcondition The clipboard is closed.
@desc If the clipboard contains data in CF_TEXT format it is copied to a
  temp memory stream, zero-terminated for good measure and copied into
  the result string.
Created 5.7.2000 by P. Below
@Raises EClipboardError
}{---------------------------------------------------------------------}

function ClipboardAsString: String;
const
  nullchar: Char = #0;
var
  ms: TMemoryStream;
begin { ClipboardAsString }
  if not IsClipboardFormatAvailable( CF_TEXT ) then
    Result := EmptyStr
  else
  begin
    ms:= TMemoryStream.Create;
    try
      CopyDataFromClipboard( CF_TEXT , ms );
      ms.Seek( 0, soFromEnd );
      ms.WriteBuffer( nullChar, Sizeof( nullchar ));
      Result := PChar( ms.Memory );
    finally
      ms.Free;
    end;
  end;
end; { ClipboardAsString }

{-- ClipboardHasFormat ------------------------------------------------}
{: Checks if the clipboard contains data in the specified format
@Param fmt is the format to check for
@Returns true if the clipboard contains data in this format, false
  otherwise
@Precondition none
@Postcondition none
@desc This is a simple wrapper around an API function.
Created 5.7.2000 by P. Below
}{---------------------------------------------------------------------}

function ClipboardHasFormat( fmt: DWORD ): Boolean;
begin { ClipboardHasFormat }
  Result := IsClipboardFormatAvailable( fmt );
end; { ClipboardHasFormat }

end.

uso Esempio:

Preparare il testo con l'editor di SQL, editor di testo, o qualsiasi altra cosa:

SELECT 
  lname,
  fname,
  dob
FROM
  employees

Seleziona tutto il testo e copiare negli appunti usando Ctrl + C.

Passa al Codice Editor del IDE, eseguire l'applicazione ClipboardToStringConst (utilizzando la voce di menu Strumenti si è aggiunto, o qualsiasi altro mezzo che si desidera). Posizionare il cursore del redattore (punto di inserimento) in cui si desidera visualizzare il testo costante, e premere Ctrl + V per incollare il testo.

const
  MySQLText = |            // The pipe indicates the insertion point.

Il risultato:

const
  MySQLText =   'SELECT '+
  '  lname, '+
  '  fname, '+
  '  dob '+
  'FROM '+
  '  employees ';

Answer 2

Vuoi dire qualcosa di simile?

myStr := 'first line'#13#10'secondline'#13#10'thirdline';

Answer 3

Abbiamo avuto lo stesso problema, e alla fine abbiamo creato un piccolo plug-in IDE (fusa con le soluzioni esistenti). Questo crea due voci di menu in più (copia e incolla extra). Una di queste paste del contenuto formattato degli appunti per l'editor di codice, l'altro fa la stessa cosa in senso inverso (copiare il contenuto della selezione negli appunti e rimuove le charachters in più).

Per usare questa:

1. Crea nuovo pacchetto in Delphi
2. Aggiungi a "designide" per la sezione richiede (e rimuovere qualsiasi altra cosa)
3. Crea nuova unità, e copiare il codice
4. costruire e installare

Codice di esempio:

unit ClipboardWizard;

interface

uses
  Windows, SysUtils, Classes, ToolsAPI, 
  {$ifdef VER280} // XE7
  VCL.Menus
  {$else}
  Menus
  {$endif};

type
  TClipboardWizard = class(TInterfacedObject, IOTAWizard)
  private
    FMainMenuItem, FCopyMenuItem, FPasteMenuItem:  TMenuItem;

    // Formatting
    function GetFormattedString: string;
    function RemoveUnneededChars(const Value: string): string;

    // Menu events
    procedure CopyToClipboard(Sender: TObject);
    procedure PasteFromClipboard(Sender: TObject);
  public
    // TObject
    constructor Create;
    destructor Destroy; override;

    // IOTANotifier
    procedure AfterSave;
    procedure BeforeSave;
    procedure Destroyed;
    procedure Modified;

    // IOTAWizard
    function GetIDString: string;
    function GetName: string;
    function GetState: TWizardState;
    procedure Execute;
  end;

procedure Register;

implementation

uses
  Vcl.Clipbrd, System.StrUtils;

procedure Register;
begin
  RegisterPackageWizard(TClipboardWizard.Create);
end;

// Formatting 

function TClipboardWizard.RemoveUnneededChars(const Value: string): string;
var
  List: TStringList;
  q: integer;
  s : string;
begin
  if Trim(Value) <> '' then
  begin
    List := TStringList.Create;
    try
      List.Text := Value;
      for q := 0 to List.Count - 1 do
      begin
        s := Trim(List[q]);
        if Length(s) > 0 then
          if s[1] = '''' then
            s := Copy(s, 2, Length(s));

        s := TrimLeft(ReverseString(s));

        if Length(s) > 0 then
          if s[1] = '+' then
            s := TrimLeft(Copy(s, 2, Length(s)));

        if Length(s) > 0 then
          if s[1] = ';' then
            s := TrimLeft(Copy(s, 2, Length(s)));

        if Length(s) > 0 then
          if s[1] = '''' then
            s := TrimLeft(Copy(s, 2, Length(s)));

        s := StringReplace(s, '''''', '''', [rfReplaceAll]);

        List[q] := ReverseString(s)
      end;

      Result := List.Text;
    finally
      List.Free;
    end;
  end
  else
    Result := '';
end;

procedure TClipboardWizard.CopyToClipboard(Sender: TObject);
begin
  with BorlandIDEServices as IOTAEditorServices do
    if Assigned(TopView) then
      Clipboard.AsText := RemoveUnneededChars(TopView.Block.Text);
end;

function TClipboardWizard.GetFormattedString: string;
const
  FSingleQuote = '''';
  Indent: array [boolean] of string = ('  ', '');
  EndChar: array [boolean] of string = (' +', ';');
var
  List: TStringlist;
  q: Integer;
begin
  if Clipboard.HasFormat(CF_TEXT) then
  begin
    List := TStringlist.Create;
    try
      List.Text := Clipboard.AsText;

      for q := 0 to List.Count - 1 do
        List[q] := Indent[q <> 0] + AnsiQuotedStr(TrimRight(List[q]) + #32, FSingleQuote) +
                   EndChar[q = (List.Count - 1)];

      Result := List.Text;
    finally
      List.Free;
    end;
  end;
end;

procedure TClipboardWizard.PasteFromClipboard(Sender: TObject);
begin
  with BorlandIDEServices as IOTAEditorServices do
    if Assigned(TopView) then
    begin
       TopView.Buffer.EditPosition.InsertText(GetFormattedString);
       TopView.Paint; // invalidation
    end;
end;


{ Anything else }
constructor TClipboardWizard.Create;
var
  NTAServices : INTAServices;
begin
  NTAServices := BorlandIDEServices as INTAServices;

  // Main Menu
  FMainMenuItem := TMenuItem.Create(nil);
  FMainMenuItem.Caption := 'Clibrd Extra' ;
  NTAServices.MainMenu.Items.Add(FMainMenuItem);

  // Sub Menus
  FCopyMenuItem := TMenuItem.Create(nil);
  FCopyMenuItem.Caption := 'Copy to clipboard';
  FCopyMenuItem.OnClick := Self.CopyToClipboard;
  FMainMenuItem.Add(FCopyMenuItem);

  FPasteMenuItem := TMenuItem.Create(nil);
  FPasteMenuItem.Caption := 'Paste from clipboard';
  FPasteMenuItem.OnClick := Self.PasteFromClipboard;
  FMainMenuItem.Add(FPasteMenuItem);
end;

destructor TClipboardWizard.Destroy;
begin
  if Assigned(FPasteMenuItem) then
    FreeAndNil(FPasteMenuItem);

  if Assigned(FCopyMenuItem) then
    FreeAndNil(FCopyMenuItem);

  if Assigned(FMainMenuItem) then
    FreeAndNil(FMainMenuItem);

  inherited;
end;


{ IOTANotifier }
procedure TClipboardWizard.AfterSave;
begin
end;

procedure TClipboardWizard.BeforeSave;
begin
end;

procedure TClipboardWizard.Destroyed;
begin
end;

procedure TClipboardWizard.Modified;
begin
end;

{ IOTAWizard }

function TClipboardWizard.GetIDString: string;
begin
  Result := 'Clipboard.Wizard7';
end;

function TClipboardWizard.GetName: string;
begin
  Result := 'Clipboard Wizard7';
end;

function TClipboardWizard.GetState: TWizardState;
begin
  Result := [];
end;

procedure TClipboardWizard.Execute;
begin
end;


end.

So che il codice non è perfetto, ma funziona: -)

Answer 4

Non è possibile definire una stringa su più righe senza le virgolette:

const
  myString = 'this is a long string that extends' +
             'to a second line';

Anche se, è possibile effettuare una stringa di caratteri di controllo come:

const 
  myString = #83#84#82#73#78#71;

Ma che non attribuisce al codice readble.

Answer 5

Nelle versioni di Delphi> = 2007, se si sta entrando in una stringa tra virgolette su più righe si aggiungerà automaticamente un preventivo di chiusura e + 'nella riga successiva se non si chiude la citazione da soli.

Non è una soluzione al problema ma aiuta accelerare digitare lunghe stringhe.

Answer 6

La risposta breve è no, non si può fare.(So ​​che non è quello che vuoi sentire.)

Tuttavia Andreas Hausladen ha sviluppato un'estensione capace proprio di questo.L'ho cercato su Google ma non sono riuscito a trovarlo.Penso che fosse nel suo pacchetto DLangExtensions, di cui aveva già abbandonato il supporto alla fine del 2007.:(

Answer 7

Si potrebbe valutare l'ipotesi di SQL nei componenti TQuery sulle forme o moduli di dati.

Questo risolve il problema copia / incolla, ma introduce altri (come le diff tra due versioni di una query di essere peggio).

Answer 8

Sono sorpresa di nessuno risorse menzionate. Anche se un dolore per attuare la prima volta, una volta che hai fatto una volta è possibile implementare il recupero di stringhe lunghe più righe da file senza troppi problemi. istruzioni casuali ho trovato qui: http://www.delphibasics.info/home/delphibasicssnippets/usingresourcefileswithdelphi