PBDOM defines an exception class, PBDOM_EXCEPTION, derived from the standard PowerBuilder Exception class. The standard Text property of the Exception class can be used to obtain more detail on the nature of the exception being thrown. The class extends the PowerBuilder Exception class with one method, GetExceptionCode, that returns the unique code that identifies the exception being thrown.
For a list of exception codes, see the PowerBuilder Extension Reference or the topic PBDOM exceptions in the online Help.
PBDOM is a PowerBuilder extension, built using PBNI. The extension itself might throw a PBXRuntimeError exception. In the following example, the try-catch block checks first for a PBDOM exception, then for a PBXRuntimeError.
The example builds a PBDOM_DOCUMENT from a passed-in file name and uses a user-defined function called ProcessData to handle the DOM nodes. ProcessData could be a recursive function that extracts information from the DOM elements for further processing:
Long ll_ret ll_ret = XMLParseFile(filename, ValNever!) if ll_ret < 0 then return PBDOM_Builder domBuilder TRY domBuilder = CREATE PBDOM_Builder PBDOM_Document domDoc PBDOM_Element root domDoc = domBuilder.BuildFromFile( filename ) IF IsValid( domDoc ) THEN IF domDoc.HasChildren() THEN PBDOM_Object data[] IF domDoc.GetContent( data ) THEN Long ll_index, ll_count ll_count = UpperBound( data ) FOR ll_index = 1 TO ll_count ProcessData( data[ll_index], 0 ) NEXT END IF END IF END IF CATCH ( PBDOM_Exception pbde ) MessageBox( "PBDOM Exception", pbde.getMessage() ) CATCH ( PBXRuntimeError re ) MessageBox( "PBNI Exception", re.getMessage() ) END TRY
