see
Platform Invoke Data Types
http://msdn.microsoft.com/library/en-us/cpguide/html/cpconplatforminvokedatatypes.asp?frame=trueMarshaling Data with Platform Invoke
http://msdn.microsoft.com/library/en-us/cpguide/html/cpconmarshalingdatawithplatforminvoke.asp?frame=trueConsuming Unmanaged DLL Functions
http://msdn.microsoft.com/library/en-us/cpguide/html/cpconconsumingunmanageddllfunctions.asp?frame=true
Platform Invoke Data Types
http://msdn.microsoft.com/library/en-us/cpguide/html/cpconplatforminvokedatatypes.asp?frame=trueMarshaling Data with Platform Invoke
http://msdn.microsoft.com/library/en-us/cpguide/html/cpconmarshalingdatawithplatforminvoke.asp?frame=trueConsuming Unmanaged DLL Functions
http://msdn.microsoft.com/library/en-us/cpguide/html/cpconconsumingunmanageddllfunctions.asp?frame=true
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