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Passing and Receiving Strings from OLE Functions

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Declaring a parameter as type String on an ole mode function passes a LPCOLESTR. The Microsoft VM also includes a preceding length prefix so the string can also be treated as a BSTR.

Declaring a return value as type String in ole mode causes the Microsoft VM to pass a pointer to an uninitialized LPCOLESTR*. When the native function returns, the Microsoft VM will convert the returned LPCOLESTR to a Java String, and then call CoTaskMemFree to free the string.