MemoryStreamを使用して画像をExcelに挿入する方法は？

Question

以下は2つの方法です。一方はMemoryStreamを使用し、もう一方はディスク上の実ファイルを使用します。

 public void InsertImage(long x, long y, long? width, long? height, string sImagePath, WorksheetPart wsp) 
    { 
     try 
     { 
      DrawingsPart dp; 
      ImagePart imgp; 
      WorksheetDrawing wsd; 

      ImagePartType ipt; 
      switch (sImagePath.Substring(sImagePath.LastIndexOf('.') + 1).ToLower()) 
      { 
       case "png": 
        ipt = ImagePartType.Png; 
        break; 
       case "jpg": 
       case "jpeg": 
        ipt = ImagePartType.Jpeg; 
        break; 
       case "gif": 
        ipt = ImagePartType.Gif; 
        break; 
       default: 
        return; 
      } 

      if (wsp.DrawingsPart == null) 
      { 
       //----- no drawing part exists, add a new one 

       dp = wsp.AddNewPart<DrawingsPart>(); 
       imgp = dp.AddImagePart(ipt, wsp.GetIdOfPart(dp)); 
       wsd = new WorksheetDrawing(); 
      } 
      else 
      { 
       //----- use existing drawing part 

       dp = wsp.DrawingsPart; 
       imgp = dp.AddImagePart(ipt); 
       dp.CreateRelationshipToPart(imgp); 
       wsd = dp.WorksheetDrawing; 
      } 

      using (FileStream fs = new FileStream(sImagePath, FileMode.Open)) 
      { 
       imgp.FeedData(fs); 
      } 

      int imageNumber = dp.ImageParts.Count<ImagePart>(); 
      if (imageNumber == 1) 
      { 
       Drawing drawing = new Drawing(); 
       drawing.Id = dp.GetIdOfPart(imgp); 
       wsp.Worksheet.Append(drawing); 
      } 

      NonVisualDrawingProperties nvdp = new NonVisualDrawingProperties(); 
      nvdp.Id = new UInt32Value((uint)(1024 + imageNumber)); 
      nvdp.Name = "Picture " + imageNumber.ToString(); 
      nvdp.Description = ""; 
      DocumentFormat.OpenXml.Drawing.PictureLocks picLocks = new DocumentFormat.OpenXml.Drawing.PictureLocks(); 
      picLocks.NoChangeAspect = true; 
      picLocks.NoChangeArrowheads = true; 
      NonVisualPictureDrawingProperties nvpdp = new NonVisualPictureDrawingProperties(); 
      nvpdp.PictureLocks = picLocks; 
      NonVisualPictureProperties nvpp = new NonVisualPictureProperties(); 
      nvpp.NonVisualDrawingProperties = nvdp; 
      nvpp.NonVisualPictureDrawingProperties = nvpdp; 

      DocumentFormat.OpenXml.Drawing.Stretch stretch = new DocumentFormat.OpenXml.Drawing.Stretch(); 
      stretch.FillRectangle = new DocumentFormat.OpenXml.Drawing.FillRectangle(); 

      BlipFill blipFill = new BlipFill(); 
      DocumentFormat.OpenXml.Drawing.Blip blip = new DocumentFormat.OpenXml.Drawing.Blip(); 
      blip.Embed = dp.GetIdOfPart(imgp); 
      blip.CompressionState = DocumentFormat.OpenXml.Drawing.BlipCompressionValues.Print; 
      blipFill.Blip = blip; 
      blipFill.SourceRectangle = new DocumentFormat.OpenXml.Drawing.SourceRectangle(); 
      blipFill.Append(stretch); 

      DocumentFormat.OpenXml.Drawing.Transform2D t2d = new DocumentFormat.OpenXml.Drawing.Transform2D(); 
      DocumentFormat.OpenXml.Drawing.Offset offset = new DocumentFormat.OpenXml.Drawing.Offset(); 
      offset.X = 0; 
      offset.Y = 0; 
      t2d.Offset = offset; 
      Bitmap bm = new Bitmap(sImagePath); 

      DocumentFormat.OpenXml.Drawing.Extents extents = new DocumentFormat.OpenXml.Drawing.Extents(); 

      if (width == null) 
       extents.Cx = (long)bm.Width * (long)((float)914400/bm.HorizontalResolution); 
      else 
       extents.Cx = width * (long)((float)914400/bm.HorizontalResolution); 

      if (height == null) 
       extents.Cy = (long)bm.Height * (long)((float)914400/bm.VerticalResolution); 
      else 
       extents.Cy = height * (long)((float)914400/bm.VerticalResolution); 

      bm.Dispose(); 
      t2d.Extents = extents; 
      ShapeProperties sp = new ShapeProperties(); 
      sp.BlackWhiteMode = DocumentFormat.OpenXml.Drawing.BlackWhiteModeValues.Auto; 
      sp.Transform2D = t2d; 
      DocumentFormat.OpenXml.Drawing.PresetGeometry prstGeom = new DocumentFormat.OpenXml.Drawing.PresetGeometry(); 
      prstGeom.Preset = DocumentFormat.OpenXml.Drawing.ShapeTypeValues.Rectangle; 
      prstGeom.AdjustValueList = new DocumentFormat.OpenXml.Drawing.AdjustValueList(); 
      sp.Append(prstGeom); 
      sp.Append(new DocumentFormat.OpenXml.Drawing.NoFill()); 

      DocumentFormat.OpenXml.Drawing.Spreadsheet.Picture picture = new DocumentFormat.OpenXml.Drawing.Spreadsheet.Picture(); 
      picture.NonVisualPictureProperties = nvpp; 
      picture.BlipFill = blipFill; 
      picture.ShapeProperties = sp; 

      Position pos = new Position(); 
      pos.X = x * 914400/72; 
      pos.Y = y * 914400/72; 
      Extent ext = new Extent(); 
      ext.Cx = extents.Cx; 
      ext.Cy = extents.Cy; 
      AbsoluteAnchor anchor = new AbsoluteAnchor(); 
      anchor.Position = pos; 
      anchor.Extent = ext; 
      anchor.Append(picture); 
      anchor.Append(new ClientData()); 
      wsd.Append(anchor); 
      wsd.Save(dp); 
     } 
     catch (Exception ex) 
     { 
      throw ex; // or do something more interesting if you want 
     } 
    } 

    //use memorystream 
public void InsertImage(long x, long y, long? width, long? height, MemoryStream ms, WorksheetPart wsp) 
     { 
      try 
      { 
       DrawingsPart dp; 
       ImagePart imgp; 
      WorksheetDrawing wsd; 

      ImagePartType ipt = ImagePartType.Jpeg; 

      if (wsp.DrawingsPart == null) 
      { 
       //----- no drawing part exists, add a new one 

       dp = wsp.AddNewPart<DrawingsPart>(); 
       imgp = dp.AddImagePart(ipt, wsp.GetIdOfPart(dp)); 
       wsd = new WorksheetDrawing(); 
      } 
      else 
      { 
       //----- use existing drawing part 

       dp = wsp.DrawingsPart; 
       imgp = dp.AddImagePart(ipt); 
       dp.CreateRelationshipToPart(imgp); 
       wsd = dp.WorksheetDrawing; 
      } 
      Bitmap bitmap = new Bitmap(ms); 
      imgp.FeedData(ms); 

      int imageNumber = dp.ImageParts.Count<ImagePart>(); 
      if (imageNumber == 1) 
      { 
       Drawing drawing = new Drawing(); 
       drawing.Id = dp.GetIdOfPart(imgp); 
       wsp.Worksheet.Append(drawing); 
      } 

      NonVisualDrawingProperties nvdp = new NonVisualDrawingProperties(); 
      nvdp.Id = new UInt32Value((uint)(1024 + imageNumber)); 
      nvdp.Name = "Picture " + imageNumber.ToString(); 
      nvdp.Description = ""; 
      DocumentFormat.OpenXml.Drawing.PictureLocks picLocks = new DocumentFormat.OpenXml.Drawing.PictureLocks(); 
      picLocks.NoChangeAspect = true; 
      picLocks.NoChangeArrowheads = true; 
      NonVisualPictureDrawingProperties nvpdp = new NonVisualPictureDrawingProperties(); 
      nvpdp.PictureLocks = picLocks; 
      NonVisualPictureProperties nvpp = new NonVisualPictureProperties(); 
      nvpp.NonVisualDrawingProperties = nvdp; 
      nvpp.NonVisualPictureDrawingProperties = nvpdp; 

      DocumentFormat.OpenXml.Drawing.Stretch stretch = new DocumentFormat.OpenXml.Drawing.Stretch(); 
      stretch.FillRectangle = new DocumentFormat.OpenXml.Drawing.FillRectangle(); 

      BlipFill blipFill = new BlipFill(); 
      DocumentFormat.OpenXml.Drawing.Blip blip = new DocumentFormat.OpenXml.Drawing.Blip(); 
      blip.Embed = dp.GetIdOfPart(imgp); 
      blip.CompressionState = DocumentFormat.OpenXml.Drawing.BlipCompressionValues.Print; 
      blipFill.Blip = blip; 
      blipFill.SourceRectangle = new DocumentFormat.OpenXml.Drawing.SourceRectangle(); 
      blipFill.Append(stretch); 

      DocumentFormat.OpenXml.Drawing.Transform2D t2d = new DocumentFormat.OpenXml.Drawing.Transform2D(); 
      DocumentFormat.OpenXml.Drawing.Offset offset = new DocumentFormat.OpenXml.Drawing.Offset(); 
      offset.X = 0; 
      offset.Y = 0; 
      t2d.Offset = offset; 


      DocumentFormat.OpenXml.Drawing.Extents extents = new DocumentFormat.OpenXml.Drawing.Extents(); 
      //Bitmap bitmap = new Bitmap(ms); 
      if (width == null) 
       extents.Cx = (long)bitmap.Width * (long)((float)914400/bitmap.HorizontalResolution); 
      else 
       extents.Cx = width * (long)((float)914400/bitmap.HorizontalResolution); 

      if (height == null) 
       extents.Cy = (long)bitmap.Height * (long)((float)914400/bitmap.VerticalResolution); 
      else 
       extents.Cy = height * (long)((float)914400/bitmap.VerticalResolution); 

      bitmap.Dispose(); 

      t2d.Extents = extents; 
      ShapeProperties sp = new ShapeProperties(); 
      sp.BlackWhiteMode = DocumentFormat.OpenXml.Drawing.BlackWhiteModeValues.Auto; 
      sp.Transform2D = t2d; 
      DocumentFormat.OpenXml.Drawing.PresetGeometry prstGeom = new DocumentFormat.OpenXml.Drawing.PresetGeometry(); 
      prstGeom.Preset = DocumentFormat.OpenXml.Drawing.ShapeTypeValues.Rectangle; 
      prstGeom.AdjustValueList = new DocumentFormat.OpenXml.Drawing.AdjustValueList(); 
      sp.Append(prstGeom); 
      sp.Append(new DocumentFormat.OpenXml.Drawing.NoFill()); 

      DocumentFormat.OpenXml.Drawing.Spreadsheet.Picture picture = new DocumentFormat.OpenXml.Drawing.Spreadsheet.Picture(); 
      picture.NonVisualPictureProperties = nvpp; 
      picture.BlipFill = blipFill; 
      picture.ShapeProperties = sp; 

      Position pos = new Position(); 
      pos.X = x * 914400/72; 
      pos.Y = y * 914400/72; 
      Extent ext = new Extent(); 
      ext.Cx = extents.Cx; 
      ext.Cy = extents.Cy; 
      AbsoluteAnchor anchor = new AbsoluteAnchor(); 
      anchor.Position = pos; 
      anchor.Extent = ext; 
      anchor.Append(picture); 
      anchor.Append(new ClientData()); 
      wsd.Append(anchor); 
      wsd.Save(dp); 
     } 
     catch (Exception ex) 
     { 
      throw ex; // or do something more interesting if you want 
     } 
    } 

私が最初の方法（ディスク上の実際のファイルを使用）を起動すると、それは問題ありません。私の写真をExcelファイルに挿入できます。しかし、私がmemorystreamにファイルを読み込んでmethod2を呼び出すと、エラーメッセージのあるピクチャ矩形が見えます。

私の質問はどのようにmemorystream経由でExcelに画像を挿入できますか？私はディスク上にあまりにも多くのファイルを作成しないためです。

Answer 1

OK、私は解決策を見つけたと思います。

は、私は、文字列へのMemoryStreamのパラメータを変更し、それは以下のようにMemoryStreamをに変換：

MemoryStream ms = new System.IO.MemoryStream(System.Convert.FromBase64String(str)) 

さて、それは動作します。

私はopen xml sdk 2.5の生産性ツールから学びます。

Answer 2

は、私はあなたが最初のストリームからのビットマップ画像データを作成する必要があると考えてい

ソリューションは、スタックオーバーフローの上に、ここで、そのためにすでにあります

：

：ビットマップイメージ にバイト配列Iは、溶液からコードをコピー＆ペースト

int w= 100; 
int h = 200; 
int ch = 3; //number of channels (ie. assuming 24 bit RGB in this case) 

byte[] imageData = new byte[w*h*ch]; //you image data here 
Bitmap bitmap  = new Bitmap(w,h,PixelFormat.Format24bppRgb); 
BitmapData bmData = bitmap.LockBits(new System.Drawing.Rectangle(0, 0, bitmap.Width, bitmap.Height), ImageLockMode.ReadWrite, bitmap.PixelFormat); 
IntPtr pNative  = bmData.Scan0; 
Marshal.Copy(imageData,0,pNative,w*h*ch); 
bitmap.UnlockBits(bmData);