AutoCAD uses COM to call Preference to set the background color

To access the system setting Preference in AutoCAD, you must call the com api to add a reference to Autodesk. AutoCAD. Interop:

 

Directly run the Code:

 

Using Autodesk. AutoCAD. Runtime;
Using Autodesk. AutoCAD. ApplicationServices;
Using Autodesk. AutoCAD. DatabaseServices;
Using Autodesk. AutoCAD. EditorInput;
Using Autodesk. AutoCAD. Interop;

Using System. Drawing;

 

 

[CommandMethod ("GetBkClr")]

Public void GetBkGndColor ()

{

// Access the Preferences object

AcadPreferences acPrefComObj = (AcadPreferences) Application. Preferences;

Uint clr = acPrefComObj. Display. GraphicsWinLayoutBackgrndColor;

Ed. WriteMessage (UIntToColor (clr). ToString ());

}

 

[CommandMethod ("SetBKClr", CommandFlags. Session)]

Public void SetBkGroundColor ()

{

// Access the Preferences object

AcadPreferences acPrefComObj = (AcadPreferences) Application. Preferences;

 

// Use the CursorSize property to set the size of the crosshairs

AcPrefComObj. Display. CursorSize = 100;

 

System. Drawing. Color bkClr = Color. FromArgb (0,255,255,255); // white, do not use known color, use Argb instead.

 

// AcPrefComObj. Display. GraphicsWinLayoutBackgrndColor = ColorToUInt (bkClr );

AcPrefComObj. Display. GraphicsWinModelBackgrndColor = ColorToUInt (bkClr );

 

}

 

Private uint ColorToUInt (Color color)

{

Return (uint) (color. A <24) | (color. R <16) |

(Color. G <8) | (color. B <0 ));

}

 

Private System. Drawing. Color UIntToColor (uint color)

{

Byte a = (byte) (color> 24 );

Byte r = (byte) (color> 16 );

Byte g = (byte) (color> 8 );

Byte B = (byte) (color> 0 );

Return Color. FromArgb (a, r, g, B );

}

 

 

Where the conversion function comes from the http://www.daniweb.com/software-development/csharp/code/217202