Flange Predefined Section name Using Toolkit

the question boils down to 2D polygon matching, scale/rotation/mirror invariant.

google 'shape matching algorithm c++ python'.

take a look at Boost.Polygon library and OpenCV library. 

HIH.

I could not find a PTC API for getting a bend feature’s shape (C, Z, …) for PRO_FEAT_WALL features, but the shape information is printed in the output of the Creo Parametric functionality: Information → Feature Information, in the feature.inf.
This text can be requested via TOOLKIT API and stored as a file (with a custom name) as follows:
 

    _swprintf(wsTmpInfoFileName, PDS_PROG_NAMEW L"_PRO_FEAT_INFO_feat_id_%d.txt", pFeat->pFeat.id);
    pErr = ProOutputFileMdlnameWrite(pFeat->pFeat.owner, wsTmpInfoFileName, PRO_FEAT_INFO, NULL, (ProAppData) &pFeat->pFeat.id, NULL, NULL);

//...

// Scan result file, line by line, search for relevant token (attention: some strings in this feature.inf output are Creo language specific, so we better exclude them from our search, where possible.)

if ( strstr(cLine, " = C_HEM ") != NULL ) {
	pFeat->enmBendType = PDS_OBP_BendType_C;	// Found PRO_FEAT_WALL feature with Shape C_HEM.
} else if ( strstr(cLine, " = Z_HEM ") != NULL ) {
	pFeat->enmBendType = PDS_OBP_BendType_Z;	// Found PRO_FEAT_WALL feature with Shape Z_HEM.
} // ...

This works in first tests so far.