Question

If the file is .c MSVC will compile.

If it’s .cpp it "cannot convert from 'void *' to 'unsigned char *'"

I’m using the MEMORY_BASIC_INFORMATION::BaseAddress in windows.h which is void*, assigning it to a char* so I can see the actual address you know?

When I cast it to char*, and later back to void* (to use it in windows functions), it like bugs out and loses data or something

What to do?

Answer 1

In C++, you must use an explicit cast to convert a void* to anything else:

void *vp;
unsigned char *cp = static_cast<unsigned char *>(vp);

This is indeed different from the situation in C, where a void* can be implicitly converted to any other pointer type. The reverse situation is still as in C:

void *vp = cp;  // no need for a static_cast

However, I don’t see why you’d need a char* to “see the actual address” as a void* can be printed as-is by operator<< on std::ostream and by std::printf with %p.