How set parameter vaules of a stub depend on test case

AlexWeidm

In my project I've a stub of a fread -function (ANSI C file raed).

CppTest_Stub_fread (void * _MT_var52, size_t _MT_var53, size_t _MT_var54, FILE * _MT_var55); //stub declaration

How to set the out put paramer _MT_var52 from the testcase body?

CPPTEST_ON_CALL("foo")->Arg("__return").Assign()->Int(5);
CPPTEST_ON_CALL("fread")->Arg("_MT_var52").Assign()->Int(1024);