对于很小的票据，打印起来很难套格式，连续打印时错位会很严重，这样我们可以用黑标检测来解决这个问题，当打印机打印完一张票据时就检测黑标，这样打印机将会停在检测到的黑标后面，打印一下张时将不会跑位。

黑标打印需要的条件：

１、打印机要支持黑标发票。打印说明书中可以查到。

２、行矩要跟据打印机来定，一般打印字体一样时，不同的打印机行矩会一样的。

下面是一个示例：

unit PrintHBUnit;

interface
            
uses SysUtils, IniFiles, windows, Forms, Dialogs, Classes;

//定义打印的记录类型

type
  TPrintObj = record
    Hbsbh: string;
    Dffsny: string;
    Khmc: string;
    Khdz: string;
    Dbcbh1: string;
    Jsbl1: string;
    Scbm1: string;
    Bcbm1: string;
    Dbcbh2: string;
    Jsbl2: string;
    Scbm2: string;
    Bcbm2: string;
    Dbcbh3: string;
    Jsbl3: string;
    Scbm3: string;
    Bcbm3: string;
    YDFLBH1: string;
    YDFLBH2: string;
    YDFLBH3: string;
    Fldl1: string;
    Fldl2: string;
    Fldl3: string;
    Fldj1: string;
    Fldj2: string;
    Fldj3: string;
    Shdl1: string;
    Shdl2: string;
    Shdl3: string;
    FlDF1: string;
    FlDF2: string;
    FlDF3: string;
    DDDF1: string;
    DDDF2: string;
    DDDF3: string;
    HjDL: string;
    HjDF: string;
    Scjy: string;
    Bcss: string;
    Bcxz: string;
    Bcjy: string;
    Ssdx: string;
    Cby: string;
    Sky: string;
    Fphm: string;
    Rq: string;
    sswyj: string;
    dyqdf : string;
    BlackMark: string;
    tbdf :string;
    dddf:String;//电度电费
    fldf:String;
  end;

var
  PrintObj: TPrintObj;
  MyFile: TIniFile;
  I:integer;//为1时代表已取电价,否则取电价
  mldjList:Tstrings;
  ydflbhList:Tstrings;

procedure SetPrintObj;
procedure pdrPrintObj(zs_bz:String=''''0'''');
procedure GetBlackMark;
function JeToDx(v_je: real): String;// 报表用的金额大写转换函数

implementation

uses   DB;

function JeToDx(v_je: real): String;// 报表用的金额大写转换函数
var
  l,i: integer;
  je_zs, je_xs, dx, dw, s, s1, dx_je: string;
  bFs:boolean;
begin
  If v_je=0 Then
  Begin
    Result:=''''零元整'''';
    Exit;
  End;
  if v_je<0 then
  begin
    bFs:=True;
    v_je:=(-1)*v_je;
  end
  else bFs:=False;

   je_zs:='''''''';
   je_xs:='''''''';
   if round(v_je)*100=v_je*100 then je_zs:=FloatToStr(v_je)
   else
   begin
      s:=FloatToStr(v_je*100);
      je_zs:=Copy(s,1,length(s)-2);
      je_xs:=Copy(s,length(je_zs)+1,2);
      if je_zs='''''''' then je_zs:=''''00'''';
      if je_xs='''''''' then je_xs:=''''00'''';
   end;
   dx:=''''零壹贰叁肆伍陆柒捌玖'''';
   dw:=''''元拾佰仟万拾佰仟亿'''';
   dx_je:='''''''';
   if je_zs<>'''''''' then
   begin
      l:=length(je_zs);
      s1:='''''''';
      for i:=1 to l do
      begin
         s:=Copy(dx,StrToInt(Copy(je_zs,i,1))*2+1,2);
         if s<>''''零'''' then
         begin
            dx_je:=dx_je+s;
            dx_je:=dx_je+Copy(dw,(l-i)*2+1,2);
         end
         else if s1<>''''零'''' then dx_je:=dx_je+''''零'''';
         if i=(l-4) then
         begin
            s:=Copy(dx_je,length(dx_je)-1,2);
            if s=''''零'''' then dx_je:=Copy(dx_je,1,length(dx_je)-2);
            if s<>''''万'''' then dx_je:=dx_je+''''万'''';
         end;
         s1:=s;
      end;
      s:=Copy(dx_je,length(dx_je)-1,2);
      if s=''''零'''' then dx_je:=Copy(dx_je,1,length(dx_je)-2);
      if s<>''''元'''' then dx_je:=dx_je+''''元'''';
   end;
   if je_xs='''''''' then dx_je:=dx_je+''''整''''
   else
   begin
      if Copy(je_xs,1,1)<>''''0'''' then
      begin
         if Copy(je_xs,2,1)<>''''0'''' then
         begin
             if length(je_xs)=1 then je_xs:=''''0''''+je_xs;
            dx_je:=dx_je+Copy(dx,StrToInt(Copy(je_xs,1,1))*2+1,2)+''''角'''';
            dx_je:=dx_je+Copy(dx,StrToInt(Copy(je_xs,2,1))*2+1,2)+''''分'''';
         end
         else dx_je:=dx_je+Copy(dx,StrToInt(Copy(je_xs,1,1))*2+1,2)+''''角整'''';
      end
      else
      begin
         dx_je:=dx_je+''''零''''+Copy(dx,StrToInt(Copy(je_xs,2,1))*2+1,2)+''''分'''';
      end;
   end;
   if copy(dx_je,1,2)=''''元'''' then dx_je:=''''零''''+dx_je;
   if bFs then dx_je:=''''负''''+dx_je;    
   Result:=dx_je;
end;

procedure GetBlackMark;
var
  BlackMark: string;
begin

//从INI文件中读取黑票类型
  MyFile := Tinifile.create(ExtractFilePath(Application.ExeName)+''''ydgl.ini'''');
  try
    BlackMark := MyFile.ReadString(''''Print'''', ''''PrintType'''', '''''''');
    if Length(BlackMark) <> 0 then
      PrintObj.BlackMark := BlackMark
    else
    begin
      Application.MessageBox(''''已自动配置ydgl.ini文件，默认打印机类型为：BS-310K，请检查！'''', ''''提示'''', MB_OK);
      MyFile.WriteString(''''Print'''', ''''PrintType'''', ''''BS-310K'''');
    end;
  finally
    MyFile.Free;
  end;
end;

procedure SetPrintObj;
begin
  with PrintObj do
  begin
    Hbsbh := ''''0123456789'''';
    Dffsny := ''''200401'''';
    Khmc := ''''测试用户'''';
    Khdz := ''''南昌市'''';
    Dbcbh1 := ''''A0001'''';
    Jsbl1 := ''''1'''';
    Scbm1 := ''''100'''';
    Bcbm1 := ''''150'''';
    Dbcbh2 := ''''A0002'''';
    Jsbl2 := ''''1'''';
    Scbm2 := ''''10'''';
    Bcbm2 := ''''110'''';
    Dbcbh3 := '''''''';
    Jsbl3 := '''''''';
    Scbm3 := '''''''';
    Bcbm3 := '''''''';
    Fldl1 := ''''150'''';
    Fldl2 := '''''''';
    Fldl3 := '''''''';
    Fldj1 := ''''0.50'''';
    Fldj2 := '''''''';
    Fldj3 := '''''''';
    Shdl1 := '''''''';
    Shdl2 := '''''''';
    Shdl3 := '''''''';
    FlDF1 := ''''75.00'''';
    FlDF2 := '''''''';
    FlDF3 := '''''''';
    DDDF1 := ''''75.00'''';
    DDDF2 := '''''''';
    DDDF3 := '''''''';
    HjDL := ''''150'''';
    HjDF := ''''75.00'''';
    Scjy := ''''0'''';
    Bcss := ''''100.00'''';
    Bcxz := ''''75.00'''';
    Bcjy := ''''25.00'''';
    Ssdx := ''''壹佰元整'''';
    Cby := ''''小王'''';
    Sky := ''''小李'''';
    Fphm := ''''001'''';
    Rq := ''''2004-01-30'''';
    sswyj:

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