how to read dwg text?

[farshadvl]

Hi guys. I want to make a tool to read a dwg and extract it's content text into an array of data.
my dwg in autcad is :


the right table is my goal.what should I do?

[DomCR]

Hi @farshadvl,

Here is a quick guide of steps to read and manage information in a dwg file:

1. Use the DwgReader to read the file and obtain the object CadDocument - example
2. All the entities in the model tab should be in CadDocument.Entities iterate through the list and look for TextEntity or MText to get the objects corresponding to TEXT and MTEXT in Autocad.
3. The text will be stored in the property Value for both types.

If there's anything you need, don't hesitate to ask.

Note: notice that the entity ACAD_TABLE is not implemented yet, if the text that you want to extract is in this type of entity, please open an issue and I'll fix it as soon as I can.

[farshadvl]

Tnx Sir. I have used this code for read:
public static CadDocument ReadDwg(string file) { using (DwgReader reader = new DwgReader(file, onNotification)) { CadDocument doc = reader.Read(); return doc; } }

and in my foreach loop I haven't seen any thing about TextEntity or MText.
where are they?
OpenFileDialog ofd = new OpenFileDialog(); ofd.ShowDialog(); filepath = ofd.FileName; var doc = ReadDwg(filepath); foreach (var item in doc.Entities) { richTextBox1.Text = item ???? }

[DomCR]

TextEntity and MText are types, you can identify them using this:

	foreach (var item in doc.Entities)
	{
		string text = null;
		if(item is TextEntity texte)
		{
			text = texte.Value;
		}
		if(item is MText mtext)
		{
			text = mtext.Value;
		}
	}

But, before that, make sure that the objects that you are looking for are these types, with the images I cannot know if the text that you are trying to get is from a text object, an insert with attributes or a table.

[farshadvl]

Hi man I do that but it just returned number 3 in result.
can u see this file?
I think if we could convert dwg into dxf then we can simpler trace it.
Is there any way to convert this dwg into dxf ?
12-HEX-7020-1P1-PB(D)_001-REV01.zip

[DomCR]

If you want to convert to a dxf you can use this example:

	CadDocument doc;
	using (DwgReader reader = new DwgReader(_file))
	{
		doc = reader.Read();
	}

	using (DxfWriter writer = new DxfWriter(outputPath, doc, false))
	{
		writer.Write();
	}

[DomCR]

Hi @farshadvl,

I don't understand what you mean by "it just returned number 3 in result", but I ran a simple console app using your file and works fine for me:

Here is the code:

static void Main(string[] args)
{
	CadDocument doc;
	using (DwgReader reader = new DwgReader(_file))
	{
		doc = reader.Read();
	}

	foreach (var item in doc.Entities)
	{
		if(item is TextEntity text)
		{
			Console.WriteLine($"TextEntity:{text.Value}");
		}
		else if(item is MText mtext)
		{
			Console.WriteLine($"MText:{mtext.Value}");
		}
	}
}

Inspecting the file I could see that some of the Text that I see in the image form AutoCAD are polylines:

This text won't be possible to extract as a string in the code.