Allocating and Using Memory

You can allocate either local memory or global memory for use at interrupt time.

To allocate local memory for use at interrupt time, follow these steps:

1. Use LocalAlloc with the LMEM_FIXED flag to get a handle to the memory block.
2. Pass this handle to LocalLock to get a near pointer to the memory block.

Any global memory a driver uses at interrupt-time must be page-locked. To allocate and page-lock global memory, follow these steps:

1. Use GlobalAlloc with the GMEM_MOVEABLE and GMEM_SHARE flags to get a handle to the memory block.
2. Pass this handle to GlobalLock to get a far pointer to the memory block.
3. Pass the high-order word of the far pointer to GlobalPageLock to page-lock the memory block.