VC++ Unsigned long value changed to negative number what passing to oracle procedure

i'm using C++ Unsigned Long DWORD datatype to pass greater than 2147483647 to oracle procedure. but inserting negative number in procedure. not sure why.

Procedure parameter is defined as number.

same code working on 2003 window server.

but when using the code in 2012 window server and build in VS2005 32bit mode and deploy the dll i'm facing this issue.

is it related to Windows, Oracle or C++?