aaOApi_AddClassAttribute return code 80003

yes, I can get the error message by this way (Adding an attribute in a class failed). I want to know how can I add the attribute in a class success?

Here is the code:

HAAODSATTR lpAttr = NULL;
AttrID lAttrId = 1143;
LONG lIndex = -1;
HAAODSCLASS lpClass = NULL;
aaOApi_FindClassByName(pszClassName, &lpClass)
if (!aaOApi_AddClassAttribute(lpAttr, lAttrId, lIndex, lpClass))

Working with the "ProjectWise ODS API" group of functions is not one of my "strong points", but I found a function from a project that might give you better insight on how to use this function.

extern "C" BOOL CreateNewComponentClass
(
	LPCTSTR	szClassNameP,			// i - class name
	LPAAOdsClass    *lppNewClass
)
{
	AFX_MANAGE_STATE( AfxGetStaticModuleState() );

	// long *lProjArrayP = (long *) calloc(uiCount, sizeof(long));

	// should return 0 if unsuccessful
	long lClassId = GetClassIdFromClassName (szClassNameP);

	if (lClassId > 0L)
		return FALSE;

	LPAAOdsClass    lpBaseClass = NULL;

	if (aaOApi_NewClass (lpBaseClass, lppNewClass))
	{
		if (aaOApi_SetClassName (szClassNameP, *lppNewClass))
		{
			long lAttrId = GetAttrIDFromName (L"EC_InstanceID");

			if (lAttrId > 0L)
			{
				CString	sTableName;

				sTableName.Format(L"I_%s", szClassNameP);

				CString	sSeqName;

				sSeqName.Format(L"I_%s_SEQ", szClassNameP);

				if (aaOApi_AddClassAttribute (NULL, lAttrId, 0L, *lppNewClass))
				{
					LPAAOdsAttr	lpAttr = NULL;

					CString sKeyName;

					sKeyName.Format(L"%s_Class_UniqueId", szClassNameP);

					if (SUCCESS == CreateOdsAttribute(sKeyName, sKeyName, AAODS_STRING, 100, 
						AAODS_VISIBILITY_VISIBLE, &lpAttr))
					{
						if (aaOApi_AddClassAttribute (lpAttr, 0L, -1L, *lppNewClass))
						{
							long lSystemClassId = AAODS_CLASS_NORMAL;

							long lKeyId = aaOApi_GetAttributeId (lpAttr);

							LPAAOdsQualifier lpQual = NULL;
							aaOApi_FindQualifierByName (L"ECQUAL_BUSINESSKEY", &lpQual);

							long lQualId = aaOApi_GetQualifierId (lpQual);

							aaOApi_AddClassQualifier (*lppNewClass, 
								lQualId, &lKeyId);

							if (aaOApi_SetClassProps (*lppNewClass,
								szClassNameP, 
								&lSystemClassId,
								&lAttrId,
								NULL,
								sTableName,
								sSeqName,
								NULL,
								NULL))
							{
								return TRUE;
							}
							else
							{
								TRACE (L"Error setting class properties\n");
							}
						}
						else
						{
							TRACE (L"Error adding TagClass_UniqueId to class\n");
						}
					}
					else
					{
						TRACE (L"Error finding/creating TagClass_UniqueId\n");
					}
				}
				else
				{
					TRACE (L"Error adding EC_InstanceID attribute to class\n");
				}
			}
			else
			{
				TRACE (L"Error finding EC_InstanceID attribute\n");
			}
		}
		else
		{
			TRACE (L"Error setting class name\n");
		}
	}
	else
	{
		TRACE (L"Error creating new class\n");
	}

	return FALSE;
}

Hope it helps!

FWIW, make sure that you always trap for possible errors.  In your code snippet, you are not checking to see what aaOApi_FindClassByName() returns.  

Thanks for your sample code, after following your sample code, I still encounter the error 80003:

aaOApi_AddClassAttribute failed, status:80003, errorMessage:Adding an attribute in a class failed

And here is the code snippet:

AttrID newAttrId = 0;
HAAODSATTR newAttribute;
LPCWSTR pszAttrName = L"PROJECT_name_0705";
LPCWSTR pszLabel = L"Test_label_0705";
LPCWSTR pszDesc = L"Test Desc 0705";
LONG lAttrType = AAODS_STRING;
LONG dataLength = 255;
LONG visibility = AAODS_VISIBILITY_VISIBLE;
LPCWSTR dbColumnName = L"PROJECT_column_name_0705";
BOOL isSystemAttr = TRUE;

LPCWSTR pszClassName = L"Building";
HAAODSCLASS odsClass = NULL;

WCHAR valueBuffer[ODS_STRING_BUFFER_SIZE] = { 0 };
WCHAR pszDefaultValue[] = L"abcdefg";

do
{
if (!aaOApi_FindClassByName(pszClassName, &odsClass))
{
LONG status = aaApi_GetLastErrorId();

LPCWSTR errorMessage = aaApi_GetLastErrorMessage();
LPCWSTR errorDetail = aaApi_GetLastErrorDetail();
LPCWSTR pszErrMsg = aaApi_GetMessageByErrorId(status);
break;
}

if (!aaOApi_CreateAndInitializeAttribute(
&newAttrId, &newAttribute, pszAttrName, pszLabel, pszDesc,
lAttrType, dataLength, visibility, dbColumnName, isSystemAttr))
{
LONG status = aaApi_GetLastErrorId();

LPCWSTR errorMessage = aaApi_GetLastErrorMessage();
LPCWSTR errorDetail = aaApi_GetLastErrorDetail();
LPCWSTR pszErrMsg = aaApi_GetMessageByErrorId(status);
break;
}

HAAODSATTR lpAttr = newAttribute;
LONG lAttrId = 0L;
LONG lIndex = -1L;
HAAODSCLASS lpClass = odsClass;
if (!aaOApi_AddClassAttribute(newAttribute, lAttrId, lIndex, lpClass))
{
LONG status = aaApi_GetLastErrorId();

LPCWSTR errorMessage = aaApi_GetLastErrorMessage();
LPCWSTR errorDetail = aaApi_GetLastErrorDetail();
LPCWSTR pszErrMsg = aaApi_GetMessageByErrorId(status);

std::wstringstream ss;
ss << _T("aaOApi_AddClassAttribute failed, status:") << status;
if (errorMessage)
{
ss << _T("errorMessage:") << errorMessage << std::endl;
}

if (errorDetail)
{
ss << _T("errorDetail:") << errorDetail << std::endl;
}

if (pszErrMsg)
{
ss << _T("pszErrMsg:") << pszErrMsg << std::endl;
}

::OutputDebugString(ss.str().c_str());

break;
}