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POIssues using OleDbConnection to export an image in an excel document in c#
 

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  1. POIssues using OleDbConnection to export an image in an excel document in c#
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    <p>I want to export an image to an excel document in c#</p> <p>The image the following formats: System.Windows.Media.Imaging.BitmapImage</p> <p>These are the connection details: </p> <pre><code>private const string OleDbConnection = "provider=Microsoft.Jet.OLEDB.4.0;Data Source='{0}';Extended Properties=Excel 8.0;"; private const string OleDbInsert = "INSERT INTO [Report] ([Time], [Elapsed], [Description], [Picture]) values( @timestamp, @elapsed, @description, @pic);"; private const string OleDbCreate = "CREATE TABLE [Report] ([Time] varchar(255), [Elapsed] varchar(255), [Description] varchar(255), [pic] blob);"; </code></pre> <p>I am using the following code to write the image in excel:</p> <pre><code>foreach (var e in Entries) { using(var command = new OleDbCommand { Connection = connection, CommandText = OleDbInsert }) { command.Parameters.Add(new OleDbParameter("@component", OleDbType.BSTR) { Value = e.val1 }); command.Parameters.Add(new OleDbParameter("@result", OleDbType.BSTR) { Value = e.val2 }); command.Parameters.Add(new OleDbParameter("@description", OleDbType.BSTR) { Value = e.val3}); if (e.EncodedScreenshot != string.Empty) { byte[] imageContent = imageToByteArray(ImageWpfToGDI(e.Picture)); OleDbParameter ph = new OleDbParameter("@pic", OleDbType.Binary) { Value = imageContent}; ph.Size = imageContent.Length; command.Parameters.Add(ph); } } </code></pre> <p>These are the methods I am using:</p> <pre><code> public byte[] imageToByteArray(Image imageIn) { MemoryStream ms = new MemoryStream(); imageIn.Save(ms, System.Drawing.Imaging.ImageFormat.Gif); return ms.ToArray(); } private System.Drawing.Image ImageWpfToGDI(System.Windows.Media.Imaging.BitmapImage image) { MemoryStream ms = new MemoryStream(); var encoder = new System.Windows.Media.Imaging.BmpBitmapEncoder(); encoder.Frames.Add(System.Windows.Media.Imaging.BitmapFrame.Create(image as System.Windows.Media.Imaging.BitmapSource)); encoder.Save(ms); ms.Flush(); return System.Drawing.Image.FromStream(ms); } </code></pre> <p>All the data exports to the Excel file except the image (and there definitely exists an image). Could you please give me some advice on how to fix this? I have been searching online alot but I still cannot find a solution. </p> <p>I made some modifications according to this link: <a href="https://stackoverflow.com/questions/7211367/insert-and-retrieve-image-in-access-2007-db-from-c-sharp-app">Insert and retrieve Image in Access 2007 DB from C# App</a>. I believe my error is because of the image datatypes. What datatype should I use for the image in the DB and OleDbParameter? </p> <p>Could someone help me out please? I would be grateful with any response. </p> <p>Many thanks! :)</p>
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