如何使用Delphi将数据从XML导入PDF表单?

下面是一些示例代码,它使用Acrobat的表单填充COM对象,从使用Turbopower的XML合作伙伴库解析的XML数据中填充Acrobat字段。由于一些外部依赖关系,它无法编译,并且需要进行一些重构,但它应该能让您大致了解情况。这个 Calibrate 例行程序添加了一些标记,以帮助现场放置。

unit AcrobatXMLu;

interface

uses
  [...]
  Acrobat_tlb, //  main Acrobat COM wrapper
  AFORMAUTLib_TLB;  // Acrobat Forms COM objects

type
  TGenerateFlag = (gfShowAcrobat, gfUseDefaultValues, gfGenerateTestData, gfAddCalibration, gfAlwaysFillCheckboxes);
  TGenerateFlags = set of TGenerateFlag;

function CreateAcrobatFieldsInner(eStartNode: TxpElement;
  const Path: String; Flags : TGenerateFlags; const OutputFile : String): Boolean;

implementation

function CreateAcrobatFieldsInner(eStartNode: TxpElement;
  const Path: String; Flags : TGenerateFlags; const OutputFile : String): Boolean;
var
  List : TxpNodeList;
  X : TxpNode;
  N,
  Max : Integer;
  E : TxpElement;
  Align,
  S : String;
  AddedFields : TStringlist;

  procedure CreateField(E : TxpElement);
  var
    FieldName,
    FieldType,
    MappedFieldType : String;
    PageNo : Integer;
    ALeft,
    ARight,
    ATop,
    ABottom,
    AWidth,
    AHeight : Single;
    S : String;
    Field : IField;  //  Acrobat form field
    IsMultiLine : Boolean;
  begin
     FieldName := E.GetAttribute('Name');
     if CompareText(FieldName, 'Name1') = 0 then
       NoOp;
     FieldType := LowerCase(E.GetAttribute('PdfFieldType'));
     MappedFieldType := FieldType;
     if CompareText(MappedFieldType, 'checkbox') = 0 then
       MappedFieldType := 'text';
     IsMultiLine := CompareText(MappedFieldType, 'memo') = 0;
     if (CompareText(MappedFieldType, 'Text') = 0) or (CompareText(MappedFieldType, 'Memo') = 0) then
       MappedFieldType := 'text';

     Align := LowerCase(E.GetAttribute('Align'));
     S := E.GetAttribute('Page');
     if S = '' then
       S := TxpElement(E.ParentNode).GetAttribute('Page');
     if S <> '' then
       PageNo := StrToInt(S) - 1
     else
       PageNo := 0;
     S := GetHeritableAttribute(E, 'XPos', 'FieldXPos');
     ALeft := StrToInt(S);

     ATop := E.GetAttributeInt('YPos');

     S := GetHeritableAttribute(E, 'Width', 'FieldWidth');
     if S <> '' then
       AWidth := StrToInt(S)
     else
       AWidth := 60;
     S := GetHeritableAttribute(E, 'Height', 'FieldHeight');
     if S <> '' then
       AHeight := StrToInt(S)
     else
       AHeight := 20;
     ARight := ALeft + AWidth;
     ABottom := ATop - AHeight;

     try
       Field := Acrobat.Fields.Add(FieldName, MappedFieldType, PageNo, ALeft, ATop, ARight, ABottom) as IField;
       if True or (AddedFields.IndexOf(FieldName) < 0) then begin
         if CompareText(MappedFieldType, 'text') = 0 then begin
           S := GetHeritableAttribute(E, 'TextFont', 'FieldTextFont');
           if S <> '' then
             Field.Set_TextFont(S);
           S := GetHeritableAttribute(E, 'TextSize', 'FieldTextSize');
           if S <> '' then
             if not (CompareText(S, 'Auto') = 0) then
               Field.Set_TextSize(StrToInt(S));
           if IsMultiLine then
             Field.Set_IsMultiline(True);

           S := E.GetAttribute('DefaultValue');
           S := StringReplace(S, #10, #10#13, [rfReplaceAll]);
           if S <> '' then begin
             Field.Set_Value(S);
           end
           else begin
             if CompareText(FieldType, 'checkbox') = 0 then begin
               if gfAlwaysFillCheckboxes in Flags then
                 Field.Set_Value('X')
             end
             else begin
               if gfGenerateTestData in Flags then
                 Field.Set_Value(Format('(%s)', [FieldName]));
             end;
           end;
           if Align <> '' then
             Field.Set_Alignment(Align);
         end
         else begin
           if CompareText(MappedFieldType, 'checkbox') = 0 then begin
           end;
         end;
       end;
       if AddedFields.IndexOf(FieldName) < 0 then
         AddedFields.Add(FieldName)
     except
       ShowMessage('Error adding field ' + FieldName);
     end;
  end;

  procedure Calibrate;
  var
    X,
    Y,
    N,
    M,
    Page : Integer;
    Field : IField;  // Acrobat form field

    procedure AddField(X, Y : Integer);
    var
      S : String;
      FieldName : String;
    begin
      if X < 40  then
        S := Format('Y:%d', [Y])
      else
        S := Format('X:%d', [X]);
      FieldName := Format('X%dY%d', [X, Y]);
      Field := Acrobat.Fields.Add(FieldName, 'text', Page, X, Y, X + 40, Y - 15) as IField;
      Field.Set_TextFont('Courier');
      Field.Set_TextSize(10);
      Field.Set_Value(S);

    end;
  begin
    for Page := 0 to ((Acrobat.AcroApp.GetActiveDoc as CAcroAVDoc).GetPDDoc as CAcroPDDoc).GetNumPages - 1 do begin
      for N := 1 to 15 do
        AddField(40 * N, 0);
      N := 15;
      for M := 0 to 60 do
        AddField(0, N * M);
    end;
  end;

begin
  AddedFields := TStringlist.Create;
  AddedFields.Sorted := True;
  Result := False;
  try
    List := eStartNode.SelectNodes(Path);
    try
      Max := List.Length - 1;
      for N := 0 to Max do begin
        X := List.Item(N);
        if not (X is TxpElement) then Continue;
        E := TxpElement(X);
        S := E.GetAttribute('YPos');
        if S <> '' then
          CreateField(E);
      end;
      Result := True;
    finally
      List.Free;
    end;
    if gfAddCalibration in Flags then
      Calibrate;
    Acrobat.DocV.GetPDDoc.Save(PDSaveFull, OutputFile);
  finally
    AddedFields.Free;
  end;
end;

end.

如前所述,这段代码添加了XML中定义的字段,并在执行过程中填充这些字段。明显的实际上,填写现有字段是一件小事。

Delphi的一些第三方PDF库也可以填充Acrobat字段。此外,命令行库PDFtk还可以填充Acrobat字段,并执行Acrobat COM对象无法执行的其他操作,例如“展平”PDF表单,这将有效地将字段中的文本合并到宿主文档中,因此不再作为表单进行编辑。看见 https://www.pdflabs.com/docs/pdftk-man-page/ 了解更多信息。