The [range] attribute lets you specify a range of allowable values for arguments or fields whose values are set at run time. When used with a pipe type, the attribute specifies the allowable range for the count of elements in the pipe chunks.
[range(low-val,high-val)] type-specifier declarator
The lowest allowable value that the parameter or field can hold.
The highest allowable value that the parameter or field can hold.
A standard C declarator, such as an identifier.
Use the [range] attribute to modify the meaning of sensitive parameters or fields, such as those used for size or length, with conformant or varying arrays; or whenever you want to check a parameter or field value against a range of valid values. The attribute is applicable to top-level parameters as well as lower-level parameters and fields. Adding the [range] attribute to a type does not change its wire format, thus does not affect backward compatibility.
The [range] attribute can also be used on conformant data such as buffers or arrays with a conformance attribute. The effect is to limit all conformance sizes for the conformant data to the specified range. If the conformant data is a multi-dimensional array, each array dimension is limited to the specified range.
Use of [range] on conformant data requires that the compilation target be –target NT60 or higher.
Note that you must use the /robust compiler option when you compile your IDL file in order to generate the stub code that will perform these checks. Without the /robust switch, the MIDL compiler ignores this attribute.
HRESULT Method1( [in, range(0,100)] ULONG m, [in, range(0,100)] ULONG n, [size_is(m,n)] ULONG **pplong); void InPipe( [in, range(0, MAX_CHUNK) LONG_PIPE pipe_date);