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Compiler Error C3369

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'module name': idl_module already defined

The idl_module usage where you define the DLL can only occur once in a program.

The following sample generates C3369:

// C3369.cpp
// compile with: /c
[idl_module(name="name1", dllname="x.dll")]; // C3369
[idl_module(name="name1", dllname="x.dll")];