通过Windows API代码包获取网络DWG文件的缩略图

Question

I use the below code to get the DWG file thumbnail using the Windows API Code Pack:

ShellFile shellFile = ShellFile.FromFilePath(mediaInfo.Filename);
return shellFile.Thumbnail.LargeBitmap;

But this works for local DWG files only, and returns the blank document thumbnails for network based files.

However I see the thumbnails of network files via the Windows Explorer (I am on Win 8.1).

Any advice would be appreciated.

Answer 1

There must be something wrong happening on your side because the following code works here:

using System;
using System.Drawing;
using System.IO;
using System.Windows.Forms;
using Microsoft.WindowsAPICodePack.Shell;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            string fileName = @"\\PC\Users\Public\bitmap.bmp";
            ShellFile shellFile = ShellFile.FromFilePath(fileName);
            ShellThumbnail thumbnail = shellFile.Thumbnail;
            var pictureBox = new PictureBox
            {
                Image = thumbnail.Bitmap,
                Dock = DockStyle.Fill
            };
            Controls.Add(pictureBox);
        }
    }
}

Check the following:

• try with another extension to see if it affects all of them or not
• try to re-register thumbnails handlers, just a guess but SageThumbs might fix this by registering it and unregistering it as the default handler for extensions
• if that matters, I've used the Code Pack I've myself pushed to NuGet : https://www.nuget.org/packages/WindowsAPICodePack-Shell/ (not sure that might be the issue since I haven't changed anything)