为什么我用stringgrid的paintto方法打印出来的控件只有在左上角的一小块

Question

这是因为打印机和屏幕的单位不同。
GetDriveCaps().

Answer 1

to:　Apollo47(阿波罗)　
怎么用，能不能给个例子看看？谢了

Answer 2

这里有你想要的：
  http://www.csdn.net/expert/topic/201/201720.shtm 

Answer 3

试试这个：//*******  unit1.dfm    ************
object Form1: TForm1
  Left = 192
  Top = 168
  Width = 544
  Height = 375
  Caption = 'Form1'
  Color = clBtnFace
  Font.Charset = DEFAULT_CHARSET
  Font.Color = clWindowText
  Font.Height = -11
  Font.Name = 'MS Sans Serif'
  Font.Style = []
  OldCreateOrder = False
  PrintScale = poNone
  PixelsPerInch = 96
  TextHeight = 13
  object StringGrid1: TStringGrid
    Left = 40
    Top = 112
    Width = 337
    Height = 209
    TabOrder = 0
  end
  object Button1: TButton
    Left = 224
    Top = 48
    Width = 75
    Height = 25
    Caption = 'Button1'
    TabOrder = 1
    OnClick = Button1Click
  end
end
//*******  unit1.pas    ************
unit Unit1;interfaceuses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  StdCtrls, Grids;type
  TForm1 = class(TForm)
    StringGrid1: TStringGrid;
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;var
  Form1: TForm1;implementationuses
  Printers;{$R *.DFM}procedure TForm1.Button1Click(Sender: TObject);
var
  tb:TBitmap;
  Info: PBitmapInfo;
  InfoSize: DWORD;
  Image: Pointer;
  ImageSize: DWORD;
  Bits: HBITMAP;
  DIBWidth, DIBHeight: Longint;
  PrintWidth, PrintHeight: Longint;
begin
  Tb := TBitmap.Create;
  try
    Tb.Width := StringGrid1.Width;
    Tb.Height := StringGrid1.Height;
    Tb.Canvas.Brush := StringGrid1.Brush;
    Tb.Canvas.FillRect(Rect(0,0,Tb.Width,Tb.Height));
    Tb.Canvas.Lock;
    try
      StringGrid1.PaintTo(Tb.Canvas.Handle, 0, 0);
    finally
      Tb.Canvas.Unlock;
    end;
  except
    Tb.Free;
    raise;
  end;  Printer.BeginDoc;
  try
    try
      { Paint bitmap to the printer }
      with Printer do
      begin
        Bits := Tb.Handle;
        GetDIBSizes(Bits, InfoSize, ImageSize);
        Info := AllocMem(InfoSize);
        try
          Image := AllocMem(ImageSize);
          try
            GetDIB(Bits, 0, Info^, Image^);
            with Info^.bmiHeader do
            begin
              DIBWidth := biWidth;
              DIBHeight := biHeight;
            end;
            PrintWidth := MulDiv(DIBWidth, GetDeviceCaps(Handle,
                    LOGPIXELSX), PixelsPerInch);
            PrintHeight := MulDiv(DIBHeight, GetDeviceCaps(Handle,
                    LOGPIXELSY), PixelsPerInch);            StretchDIBits(Canvas.Handle, 0, 0, PrintWidth, PrintHeight, 0, 0,
              DIBWidth, DIBHeight, Image, Info^, DIB_RGB_COLORS, SRCCOPY);
          finally
            FreeMem(Image, ImageSize);
          end;
        finally
          FreeMem(Info, InfoSize);
        end;
      end;
    finally
    end;
  finally
    tb.free;
    Printer.EndDoc;
  end;end;end.