Reg: OCCTProxy.dll not found

I am new to Opencascade. I have downloaded opencascade 6.7.0 & have build the entire library in visual studio 2010. All the library file are now built in 'C:\OpenCASCADE6.7.0\opencascade-6.7.0\win32\vc10\libd' folder. Besides this the win32 has also has vc9 folder which has built in libraries which comes with the windows installer.
Now I have rebuild-ed the CSharp solution of the samples folder. The compilation was successful without any error. When I executed the IE_Winforms, it opens the Sample Import/Export form. Now when I click the File-->New menu item it crashes & says "Could not load file or assembly OCCTProxy.dll".
Now again I tried to debug the program & found that in the constructor of Form2(), the line "myOCCTProxy = new OCCTProxy();" was giving error as it was not able to find OCCTProxy.dll.
Note: I have already added this DLL as a reference to this project & there was no compilation error. I am only getting a runtime error.
If somebody can help me I will be highly obliged. I am using Windows 7 ultimate SP1, Windows 32 architecture & Visual Studio 2010 SP1.


Pawel's picture

Dear Tanmoy,

make sure your application "sees" all the necessary dlls: OCCT-stuff, TBB, FREEIMAGE, etc.

Probably some of the dependencies of OCCTProxy.dll cannot be found and that is why the application crashes.


kstc_chatt's picture

Hi Pawel,
Thanks for the response.I have cross checked this,& I have included evry libray. The problem I think is in the Form2 constuctor in the IE_Winform project where 'myOCCTProxy = new OCCTProxy();' is being called.

kstc_chatt's picture

Hi Pawel,
Again If I comment this line in the constructor of Form2 'myOCCTProxy = new OCCTProxy();', then I can step into code while dubugging this. Other wise it throws a FileNotFound excpetion from where From2 constructor was called which was posted & shown on my earlier message. The snaphot here shows that I can step into the Form2 constructor if this line is commented 'myOCCTProxy = new OCCTProxy();'. Although if I comment this, it will not work, but why is it so that whille uncommenting this particular line throughs the FileNotFoundError.
Please Help me in finding the solution. I am struggling to make it work.

Sam Bee's picture

I am encountering the exact same error. Have you found a solution to this?

Henrik Rune Jakobsen's picture

Take a look at the link above. I've had a similar problem and the steps in the link helped med get rid of it

Alexander Alexanov's picture

Follow instructions in your link, but no results. Can you explain what's necessary to change in project settings? Spent two days with no result.

ashish alone's picture

Hi Tanmoy

I am facing the same error which u come up with

Have u find any solution for that?


Erhan Karadağ's picture

Have any solution for this?  "Year 2019"

Wei You's picture

I'm facing the same error.... with vs2017 c#..

Wei You's picture

Maybe this will help. I inspected dependency of the OCCTProy.dll .And found out i fogot to copy the sdk to my develop file..

Caleb Ardern's picture

Any Solution on this?