紧急求救，关于图片问题！！delphi高手请help！

Question

var
youstream:tmemorystream;
begin
youstream:=tmemorystream.create;
youstream.loadfile('image1.bmp');
nmudp1.sendstream(youstream);其实是想将一张已经存在的bmp位图（'image1.bmp')读入已经定义的流中，然后发送出去
但是每次在nmudp1.sendstream(youstream)这一句执行的时候总是说 流出错了，请教，
急呀！！！ 

Answer 1

是不是图片过大，numdp1一次发送大小有限制吗？这个我不太清楚

Answer 2

我想应该先：
youstream.position:=0;
吧

Answer 3

不知道哦，高手们提供意见呀，
youstream.position:=0
是没用的，我想是不是发送限制问题呀？

Answer 4

Var
  JPeg:TJPegImage;
begin
  JPeg := TJPegImage.Create;
  With Table1 do
  Begin
    Try
      If JPegOpenPictureDialog.Execute Then
      Begin        Jpeg.LoadFromFile(JPegOpenPictureDialog.FileName);
        Edit;
        FieldByName('FieldForPhoto').Assign(JPeg);
        Post;
      End;
    Except
      ShowMessage('无法打开该图像文件！');
    End;
  End;
  Jpeg.Free;
  miShowJPeg.Click;
  inherited;
end;图片读取：
Var
  Jpeg: TJPegImage;
  BlobStream:TStream;
begin
  JPeg := TJPegImage.Create;
  Try
    Begin
      BlobStream := MusterDm.MusterTable.
          CreateBlobStream(Table1.FieldByName('FieldForPhoto'),bmRead);
      Image1.Picture.Assign(nil);
      If BlobStream.Size <= 0 Then Exit;
      JPeg.LoadFromStream(BlobStream);
      Image1.Picture.Assign(JPeg);
    End;
  Except  End;
  inherited;
  JPeg.Free;
end;