如何将64位void指针转换为32位void指针？

Question

I have a buffer(contains audio data) which is void pointer. In 32bit system, it's size is 4 byte and in 64 bit system, it's size is 8 byte. So how can i convert 64bit void pointer into 32bit void pointer without loosing any data ?

Answer 1

As long as the value in your 64-bit pointer plus the size of your buffer is less than 2^32 you can just use the lower 32 bit of your pointer. For example uint32_ptr ptr32 = static_cast<uint32_ptr>(ptr64) . It is, however, not a best practice to mess with pointers like this.

In addition, I assume you'll be using these pointers in the same process on the same machine. Any other application will fail!