Question

I have a thread with return type DWORD in C but it is then handled by a HANDLE type pointer.

What is the difference between these two types?

I am asking this question specially for ANSI C.

It is right that DWORD is uint type and HANDLE is PVOID, and C allows to cast directly DWORD to HANDLE. But is there any difference in these types or can I simply say they are the same?

It is a question that was asked during a discussion. I want to know what the right answer is.

Answer 1

Win32:

• DWORD 32 bit unsigned long
• HANDLE void * (32 bit pointer)

Win64

• DWORD 32 bit unsigned long
• HANDLE void * (64 bit pointer)

DO NOT just assume you can cast one to the other. It will work for Win32 and break when you port it to Win64.