Обработка ошибок
Примеры в этом руководстве опустили необходимую проверку ошибок, чтобы упростить код. Однако, вы будете всегда хотеть проверить состояние возвращения и брать соответствующее действие. Следующий пример показывает соответствующему использованию проверки ошибок для нескольких примеров, показанных сначала в главе 2, “ Учебник для начинающих Базы данных. ”
Acad::ErrorStatus
createCircle(AcDbObjectId& circleId)
{
circleId = AcDbObjectId::kNull;
AcGePoint3d center(9.0, 3.0, 0.0);
AcGeVector3d normal(0.0, 0.0, 1.0);
AcDbCircle *pCirc = new AcDbCircle(center, normal, 2.0);
if (pCirc == NULL)
return Acad::eOutOfMemory;
AcDbBlockTable *pBlockTable;
Acad::ErrorStatus es =
acdbHostApplicationServices()->workingDatabase()->
getSymbolTable(pBlockTable, AcDb::kForRead);
if (es != Acad::eOk) {
delete pCirc;
return es;
}
AcDbBlockTableRecord *pBlockTableRecord;
es = pBlockTable->getAt(ACDB_MODEL_SPACE, pBlockTableRecord, AcDb::kForWrite);
if (es != Acad::eOk) {
Acad::ErrorStatus es2 = pBlockTable->close();
if (es2 != Acad::eOk) {
acrx_abort("\nApp X failed to close Block" " Table. Error: %d", acadErrorStatusText(es2));
}
delete pCirc;
return es;
}
es = pBlockTable->close();
if (es != Acad::eOk) {
acrx_abort("\nApp X failed to close Block Table."
" Error: %d", acadErrorStatusText(es));
}
es = pBlockTableRecord->appendAcDbEntity(circleId,
pCirc);
if (es != Acad::eOk) {
Acad::ErrorStatus es2 = pBlockTableRecord->close();
if (es2 != Acad::eOk) {
acrx_abort("\nApp X failed to close"
" Model Space Block Record. Error: %s",
acadErrorStatusText(es2));
}
delete pCirc;
return es;
}
es = pBlockTableRecord->close();
if (es != Acad::eOk) {
acrx_abort("\nApp X failed to close"
" Model Space Block Record. Error: %d",
acadErrorStatusText(es));
}
es = pCirc->close();
if (es != Acad::eOk) {
acrx_abort("\nApp X failed to"
" close circle entity. Error: %d",
acadErrorStatusText(es));
}
return es;
}
Acad::ErrorStatus
createNewLayer()
{
AcDbLayerTableRecord *pLayerTableRecord
= new AcDbLayerTableRecord;
if (pLayerTableRecord == NULL)
return Acad::eOutOfMemory;
Acad::ErrorStatus es
= pLayerTableRecord->setName("ASDK_MYLAYER");
if (es != Acad::eOk) {
delete pLayerTableRecord;
return es;
}
AcDbLayerTable *pLayerTable;
es = acdbHostApplicationServices()->workingDatabase()->
getSymbolTable(pLayerTable, AcDb::kForWrite);
if (es != Acad::eOk) {
delete pLayerTableRecord;
return es;
}
// The linetype object ID default is 0, which is
// not a valid ID. Therefore, it must be set to a
// valid ID, the CONTINUOUS linetype.
// Other data members have valid defaults, so
// they can be left alone.
//
AcDbLinetypeTable *pLinetypeTbl;
es = acdbHostApplicationServices()->workingDatabase()->
getSymbolTable(pLinetypeTbl, AcDb::kForRead);
if (es != Acad::eOk) {
delete pLayerTableRecord;
es = pLayerTable->close();
if (es != Acad::eOk) {
acrx_abort("\nApp X failed to close Layer"
" Table. Error: %d",
acadErrorStatusText(es));
}
return es;
}
AcDbObjectId ltypeObjId;
es = pLinetypeTbl->getAt("CONTINUOUS", ltypeObjId);
if (es != Acad::eOk) {
delete pLayerTableRecord;
es = pLayerTable->close();
if (es != Acad::eOk) {
acrx_abort("\nApp X failed to close Layer"
" Table. Error: %d",
acadErrorStatusText(es));
}
return es;
}
pLayerTableRecord->setLinetypeObjectId(ltypeObjId);
es = pLayerTable->add(pLayerTableRecord);
if (es != Acad::eOk) {
Acad::ErrorStatus es2 = pLayerTable->close();
if (es2 != Acad::eOk) {
acrx_abort("\nApp X failed to close Layer"
" Table. Error: %d",
acadErrorStatusText(es2));
}
delete pLayerTableRecord;
return es;
}
es = pLayerTable->close();
if (es != Acad::eOk) {
acrx_abort("\nApp X failed to close Layer"
" Table. Error: %d",
acadErrorStatusText(es));
}
es = pLayerTableRecord->close();
if (es != Acad::eOk) {
acrx_abort("\nApp X failed to close Layer"
" Table Record. Error: %d",
acadErrorStatusText(es));
}
return es;
}
