PC-based Automation

WinAC ODK and C++/CLI : Problem with S7SMX_Open

Thread Starter: Jossie   Started: 8/2/2012 12:13 PM   Replies: 2

  8/2/2012, 12:13 PM

Jossie Joined 7/12/2007 Last visit: 3/29/2013 Posts: 3 Rating:  (0)

(0)  Recently i am trying out the SMX connection of WinAC ODK to see if i can use this for dataexchange between our software and the softplc. The (c++?) examples are working perfectly, however whenever i try to integrate the library in our software i run into troubles with the creating the connection (with the use of function S7SMX_Open), that is as a return value i always get 'S7SMX_ERR_NO_CONTROLLER'. I use the next code : // Open SMX connection [DllImport("S7smxx.dll", EntryPoint = "?S7SMX_Open@@YAHKPBDPAPAX@Z", CharSet = ::CharSet::Auto)] extern "C" S7SMX_ERROR S7SMX_Open(unsigned long dwFlags, [MarshalAs(UnmanagedType::LPStr)] String^ pDeviceName, void* phHandle); //Open the connection herr = S7SMX_Open(S7SMX_OPEN_MODE_WRITE, "WinLC RTX", &handle); I found out that the difference between my project and the vs2008 c++ example projects is the use of common language runtime which is disabled in the examples. f i enable this in the example projects (for example SMX_DataMemCopy) i run into the same problem, so my best guess here is that there is a problem with the marshalling or the String^ declaration. Does anyone have any suggestions here, or is there an example of a CLI / C++ project with the function S7SMX_Open used properly? Thanx, Jos

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  8/9/2012, 8:20 AM

bigfoot Joined 1/26/2011 Last visit: 5/16/2013 Posts: 179 Rating:  (53)	(0)  Hello, did you found any example, yet? I have no such a example for this. if you found one, maybe you can send us the link. greetings bigfoot
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  8/9/2012, 5:14 PM

Jossie Joined 7/12/2007 Last visit: 3/29/2013 Posts: 3 Rating:  (0)

(0)  No unfortunately no new examples found. Also, the c++ examples present at the WinAC ODK cd do not use the common language infrastructure option (Visual studio), so my guess is maybe  the Siemens developers never tried this or dont have a working example for CLI / C++. Too bad i only have the dll files and not the sources, now debugging is much harder. Does anyone know how to get into contact with the original developers of WinAC ODK, are they also monitoring this forum? Regards, Jos === Edited by Jossie @ 8/9/2012 5:15 PM [GMT ] ===

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