AutoCAD Development based on Visual C #--Example 1 Basic example

Example 1 Basic examples

1 , new Project

Start Visual Studio 2005, create a new project named CAD development, as shown in the following illustration:

2 , adding references

Add AutoCAD references AutoCAD 2007 type library and autocad/objectdbx Common 17.0 type library, as shown in the following illustration:

3 , global variable definition

Defined in the global variable as follows:

Autodesk.AutoCAD.Interop.AcadApplication Acadapp;

Autodesk.AutoCAD.Interop.AcadDocument Acaddoc;

Among them, Acadapplication is CAD object interface, Acaddocument is CAD file.

4 , open CAD file

Add a button to add the following code for the button to enable the ability to open a CAD file:

private void Button1_Click (object sender, EventArgs e)

{

OpenFileDialog POPENDG = new OpenFileDialog ();

Popendg.showdialog ();

string filePath = Popendg.filename;

Acadapp = new Acadapplication ();

AcadApp.Application.Visible = true;

Acaddoc = AcadApp.Documents.Open (filepath,null,null);

}

The results of the program run as shown in the following illustration:

If there is no statement "AcadApp.Application.Visible = true;" The CAD software interface cannot be displayed, only CAD can be started in the background. Through "Acadapp = new Acadapplication ();" is to create a new CAD object, but not every time you need to create a CAD object, such as when a CAD object already exists, you do not need to create a CAD object.

5 , define startup CAD the function of the object

Define a function to start CAD objects "start CAD ()" With the following code:

private void startup CAD ()

{

Try

{

Acadapp = (acadapplication) System.Runtime.InteropServices.Marshal.GetActiveObject ("Autocad.application");

Acaddoc = acadapp.activedocument;

}

Catch

{

OpenFileDialog POPENDG = new OpenFileDialog ();

Popendg.filter = "CAD file (*.DWG) |*.dwg| CAD graphic file (*.dxf) |*.dxf ";

Popendg.title = "Open CAD file";

Popendg.showdialog ();

string filePath = Popendg.filename;

if (FilePath = "")

{

MessageBox.Show ("Select the CAD file is invalid.) "," File is invalid. ");

Application.exit ();

}

Acadapp = new Acadapplication ();

Acaddoc = AcadApp.Documents.Open (FilePath, NULL, NULL);

}

AcadApp.Application.Visible = true;

Microsoft.VisualBasic.Interaction.AppActivate (acadapp.caption);

}

of which "Microsoft.VisualBasic.Interaction.AppActivate (acadapp.caption);" is to make the CAD object at the front, you also need to add the reference "Microsoft.VisualBasic" to call the function, as shown in the following illustration: