<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=us-ascii"><meta name=Generator content="Microsoft Word 12 (filtered medium)"><style><!--
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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='color:#1F497D'>Below is the original email I posted for help on the vtkGraphAlgorithm. I did some more investigation on this issue and found the following problem. I hope someone can help me to solve this problem. <o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Here is the test. I copied the class vtkVertexDegree in VTK to my testing class vtkVertexDegreeTest. I compiled the vtkVertexDegreeTest class as a static lib and dynamic lib (.dll) respectively and called this class in my test code. Now you will see the issue. If I compiled the class as a static lib, everything was fine. However, if I compiled the class as a dynamic lib, the previously described error happened. I attached my testing code for your examination. In cmake configuration, there is a switch to compile the library as a static (unchecked) or dynamic (checked) lib. Again, my VTK version is 5.4.2.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Thank you very much for your help!<o:p></o:p></span></p><div><p class=MsoNormal><span style='color:#1F497D'>-Jinzhong<o:p></o:p></span></p></div><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Yang, Jinzhong [mailto:jinzhong76@gmail.com] <br><b>Sent:</b> Tuesday, October 18, 2011 10:30 AM<br><b>To:</b> vtkusers@vtk.org<br><b>Subject:</b> Derive from vtkGraphAlgorithm<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Hi All,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I was trying to implement a class deriving from vtkGraphAlgorithm. I used the vtkBoostbreadthFirstSearch as the template for my implementation; however, I did not implement the FillInputPortInformaiton and FillOutputPortInformation. However, when I tested my code, I got the following error message:<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;font-family:NSimSun'>ERROR: In ..\..\source\Filtering\vtkExecutive.cxx, line 757<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;font-family:NSimSun'>vtkStreamingDemandDrivenPipeline (01965648): Algorithm vtkUndirectedGraphCPP(01963930) returned failure for request: vtkInformation (01965E08)<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;font-family:NSimSun'> Debug: Off<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;font-family:NSimSun'> Modified Time: 23<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;font-family:NSimSun'> Reference Count: 1<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;font-family:NSimSun'> Registered Events: (none)<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;font-family:NSimSun'> Request: REQUEST_DATA_OBJECT<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;font-family:NSimSun'> ALGORITHM_AFTER_FORWARD: 1<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;font-family:NSimSun'> FORWARD_DIRECTION: 0<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;font-family:NSimSun'><o:p> </o:p></span></p><p class=MsoNormal>The following is the testing code to call my implemented class vtkUndirectedGraphCPP:<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;font-family:"Courier New"'> vtkUndirectedGraphCPP * cpp = vtkUndirectedGraphCPP::New();<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;font-family:"Courier New"'> cpp->SetInput(g);<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;font-family:"Courier New"'> cpp->SetOriginVertex(<span style='color:#FF8000'>0</span>);<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;font-family:"Courier New"'> cpp->SetEdgeCostArrayName(<span style='color:#A31515'>"weights"</span>);<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Courier New"'> cpp->Update();<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Courier New"'><o:p> </o:p></span></p><p class=MsoNormal>Here g is a vtkMutableUndirectedGraph. I did a little bit search and found that I should overwrite RequestDataObject instead of RequestData. This would be quite different from other implementations in vtk. Could anybody help to solve this problem? My VTK version is 5.4.2.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Thanks,<o:p></o:p></p><p class=MsoNormal>Jinzhong<o:p></o:p></p></div></body></html>