ObjectARX provides a compatibility mode for the single drawing interface (SDI) of previous releases. It is controlled by the SDI system variable. Possible values for SDI are shown in the following table:
|
SDI system variable values |
|
|---|---|
|
Value |
Meaning |
|
0 |
MDI is enabled |
|
1 |
SDI mode set by user |
|
2 |
SDI mode implied by loaded non–MDI-aware applications |
|
3 |
SDI mode implied both by user and by loaded non–MDI-aware applications |
Be aware of the following restrictions on changing the value of SDI:
- SDI can only be set to values of 2 or 3 by AutoCAD, as applications are loaded and unloaded.
- Always check the current value of SDI before making changes. If the current value is 2 or 3, do not change it.
- Changing SDI to 1 from 0 will fail when AutoCAD has more than one document open.
All document lock checking is disabled when AutoCAD is running in any of the SDI modes.