You can't cast a void* to unmanaged memory to a managed . It's a tiny difference: According to the C Standard, all "pointer to struct" have identical representation, so do all "pointer to union", so do "void*" and "char*", but a void* and a "pointer to struct" can have different sizeof and/or different representation. basically I have a native c++ dll which will call a function in my CLI with a void* as a parameter like this: bool Class1::func1 (int num0,void* pStruct,int num1,int num2) then in my CLI I will have to convert the void* to an Object^ and pass it to the c# fucntion: The reinterpret_cast<> I posted is the equivalent (valid) C++ code. Well, not if you account for struct alignment in C. Pointer to a Structure in C - C Programming Tutorial - OverIQ.com 4 yr. ago. It is also called general purpose pointer. - the struct is 32 bits but "void *" is not. Note the difference between the type casting of a variable and type casting of a pointer. C Language Tutorial => Dereferencing a Pointer to a struct We also create another interger type variable data. void pointer in C / C++. AFAIK casting from (int (*)(int, int)) to (void (*)(void)) and back would be even less-well-defined than to/from void *, and there's no POSIX mmap or dlsym case to protect that usage from wonkiness.union is probably the best bet AFAIK.. Edit: As noted downthread, C99 enables casts between function pointer types. Struct Pointer Cast of Void Pointer - Oracle® Solaris Studio 12.4: C ... Also noted downthread, boo @ that though. reinterpret_cast in C++ | Type Casting operators - GeeksforGeeks Of course, 64 value are likely to be able to hold 32 value. A void pointer in C is a pointer that does not have any associated data type. I think you should keep it. If malloc() succeeds it will point to an object of type struct point // The type of p has not changed (it's still a pointer to an object of struct point; i.e. For example I have the follwowing data structure: typedef struct struct_a_s u_int16_t my_id; u_int_t num_counter; } struct_a_t; typedef struct struct_b_s char name[30; int age; } struct_b_t /* data point to data of ether struct_b_t or struct_a_t In C, you can implicitly cast from void* to another pointer type. A void pointer in C clearly indicates that it is empty and can only capable of holding the addresses of any type. A void pointer can hold address of any type and can be typecasted to any type. arduino struct pointer - gyogankun.net A pointer can be null. With lint -Xalias_level=weak (or higher), this example generates a warning. Memory allocation also gets easy with this type of void pointer in C.
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