hello I am starting to learn how to import functions using
Win32::API
the following function outputs a pointer to a structure
and I understand how to use perls pack to "build" the required
structure.
WINSETUPAPI BOOL WINAPI
SetupDiEnumDeviceInfo(
IN HDEVINFO DeviceInfoSet,
IN DWORD MemberIndex,
OUT PSP_DEVINFO_DATA DeviceInfoData
);
typedef struct _SP_DEVINFO_DATA {
DWORD cbSize;
GUID ClassGuid;
DWORD DevInst;
ULONG_PTR Reserved;
} SP_DEVINFO_DATA, *PSP_DEVINFO_DATA;
SP_DEVINFO_DATA is represented as
$devdata = pack ( 'LL4LL', 28, 0, 0, 0 );
then setupdienumdeviceinfo can be called as
SetupDiEnumDeviceInfo( $devicedev, $index, $devdata );
my question is this; what if the structure is unknown?
how can I prepare a packed scalar of unknown size or
of variable size?
BOOLEAN
HidD_GetPreparsedData(
IN HANDLE HidDeviceObject,
OUT PHIDP_PREPARSED_DATA *PreparsedData
);
looking at MSDN online we get the following
"The internal structure of a _HIDP_PREPARSED_DATA
structure is reserved for internal system use"
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