The ObjectARX function, acedSetCurrentUCS(), takes an AcGeMatrix3d. This matrix specifies the information about the UCS to set (origin, x-, y- and z-direction). All you need to do is to get this matrix from a named UCS.
The code below does this task:
ACHAR name[133];
// Get the UCS name to restore
if (RTNORM != acedGetString(0, ACRX_T("\nUCS to restore: "), name))
return;
AcDbDatabase *pDb
= acdbHostApplicationServices()->workingDatabase();
AcDbUCSTable *pTable = NULL;
if (Acad::eOk != pDb->getUCSTable(pTable, AcDb::kForRead))
return;
// Get the UCS table record knowing its name
AcDbUCSTableRecord *pUCS = NULL;
if (Acad::eOk != pTable->getAt(name, pUCS, AcDb::kForRead))
{
acutPrintf(ACRX_T("\nCannot get UCS ‘%s’."), name);
pTable->close();
return;
}
pTable->close();
// Get the UCS parameters
AcGePoint3d origin = pUCS->origin();
AcGeVector3d xDirection = pUCS->xAxis();
AcGeVector3d yDirection = pUCS->yAxis();
AcGeVector3d zDirection = xDirection.crossProduct(yDirection);
pUCS->close();
// Create the matrix for the UCS
AcGeMatrix3d matrix;
matrix.setCoordSystem(origin, xDirection, yDirection, zDirection);
// Activate the UCS
acedSetCurrentUCS(matrix);
Note : This solution does not change the UCS name that is displayed by AutoCAD using the UCSNAME system variable.
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