Examplevoid MyFunction([out] short * pcount);
ResThe out attribute identifies pointer parameters that are returned from the called procedure to the calling procedure (from the server to the client).
The out attribute indicates that a parameter that acts as a pointer and its associated data in memory are to be passed back from the called procedure to the calling procedure.
The out attribute must be a pointer. DCE IDL compilers require the presence of an explicit * as a pointer declarator in the parameter declaration. Microsoft IDL offers an extension that drops this requirement and allows an array or a previously defined pointer type.A related attribute, in, indicates that the parameter is passed from the calling procedure to the called procedure. The in and out attributes specify the direction in which the parameters are passed. A parameter can be defined as in-only, out-only, or in, out.
An out-only parameter is assumed to be undefined when the remote procedure is called and memory for the object is allocated by the server. Since top-level pointer/parameters must always point to valid storage, and therefore cannot be null, out cannot be applied to top-level unique or
ptr pointers. Parameters that are ref pointers must be either in or in, out parameters.
ResThe out attribute identifies pointer parameters that are returned from the called procedure to the calling procedure (from the server to the client).
The out attribute indicates that a parameter that acts as a pointer and its associated data in memory are to be passed back from the called procedure to the calling procedure.
The out attribute must be a pointer. DCE IDL compilers require the presence of an explicit * as a pointer declarator in the parameter declaration. Microsoft IDL offers an extension that drops this requirement and allows an array or a previously defined pointer type.A related attribute, in, indicates that the parameter is passed from the calling procedure to the called procedure. The in and out attributes specify the direction in which the parameters are passed. A parameter can be defined as in-only, out-only, or in, out.
An out-only parameter is assumed to be undefined when the remote procedure is called and memory for the object is allocated by the server. Since top-level pointer/parameters must always point to valid storage, and therefore cannot be null, out cannot be applied to top-level unique or
ptr pointers. Parameters that are ref pointers must be either in or in, out parameters.
如果是out+reval,则就跟普通的function似的有一个:type的返回值