The ICM_GET message retrieves an application-defined doubleword from a video
wParam = (DWORD) (LPVOID) pv;
lParam = (DWORD) cb;
Address of a block of memory to be filled with the current state. You can also
specify NULL to determine the amount of memory required by the state
Size, in bytes, of the block of memory.
Returns the amount of memory, in bytes, required to store the status
The structure used to represent state information is driver specific and is
defined by the driver.
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