使用 firebird 从 delphi 中的 blob 字段加载和保存图像 [英] Load and save image from blob field in delphi using firebird

问题描述

在我的 Firebird 数据库中，我有一个包含位图的 Blob 字段.我必须加载并显示在我的表单上的 TImage 中.随后，我必须将 OpenDialog 选择的图像保存在同一字段中.

In my Firebird database I have a Blob field that contain a Bitmap. I'll have to load and display in a TImage located on my Form. Subsequently I'll have to save in the same field the image selected by a OpenDialog.

推荐答案

Procedure LoadBitmapFromBlob(Bitmap: TBitmap; Blob: TBlobField);
var
  ms, ms2: TMemoryStream;
begin
  ms := TMemoryStream.Create;
  try
    Blob.SaveToStream(ms);
    ms.Position := 0;
    Bitmap.LoadFromStream(ms);
  finally
    ms.Free;
  end;
end;

示例用法

procedure TForm4.Button1Click(Sender: TObject);
var
  bmp: TBitmap;
begin
  bmp := TBitmap.Create;
  try
    LoadBitmapFromBlob(bmp, TBlobField(Dataset.FieldByName('Image')));
    Image1.Picture.Assign(bmp);
    bmp.SaveToFile(OpenDialog.FileName);
  finally
    bmp.Free;
  end;

end;

这篇关于使用 firebird 从 delphi 中的 blob 字段加载和保存图像的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！