.NET

[#1]

Hi,

have you found that blog:

>>>Database.ThumbnailBitmap returns Nothing when called for a side database<<<?

I think that will be the answer.

- alfred -

[#2]

Hi alfred,

I have no idea what is wrong in this project

I changed like this:

public System.Drawing.Bitmap get_image_of_file(string filename)
{
//create a new database instance and load the dwg file into it.
Database dbb = new Database(false, true);
//dbb.ReadDwgFile(filename, FileOpenMode.OpenForReadAndAllShare, false, "");
dbb.ReadDwgFile(filename, FileOpenMode.OpenForReadAndReadShare, true, "");
MessageBox.Show(filename);
//grab the thumbnail bitmap and get rid of the white background
System.Drawing.Bitmap preview = dbb.ThumbnailBitmap;
// preview.MakeTransparent(System.Drawing.Color.White);

return preview;
}

and it did not work. Error is the same.

Messagebox show me path to DWG file - is correct.

But I thank you for your patience and help

My control "Palette" look like:

in AutoCAD (during run & debug), my Palette look like:

no label.control, no background.color - This is weird, do not you think?

Maybe I do something wrong in other place?

regards

[#3]

Hi,

do you have an older version of AutoCAD? I did test the attached project in debug-mode (with AutoCAD 2010) and it shows the preview icon. Update the references and verify it on your system.

-.alfred -

[#4]

Hi Alfred,

I don't have AutoCAD2010, but I did test in AutoCAD2012.

It's work good, but... I noticed that some of the blocks are correct, others do not.

In attached are two blocks: 2010 not read, 2011 read.

Maybe here is the problem, not in program?

regards

[#5]

Hi,

the 2010.DWG is a definition of a dynamic block, so when you open this drawing you get the question like that.

 

When opening your block with your preview-tool I get then this exception:

makes me thinking that opening a dynamic-blockdefinition is not supported yet by the API (at least with AutoCAD-2010).

 In this case I would understand some difficulties to querying the thumbnail from the db-object.

But the 2011.DWG does work with your preview (at my workstation/with AutoCAD 2010).

- alfred -