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EngProbeForReadAndWrite function (winddi.h)

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The EngProbeForReadAndWrite function probes a structure for read and write accessibility.

Syntax

ENGAPI VOID EngProbeForReadAndWrite(
  [in, out] PVOID Address,
  [in]      ULONG Length,
  [in]      ULONG Alignment
);

Parameters

[in, out] Address

Pointer to the structure to be probed.

[in] Length

Specifies the length, in bytes, of the structure to be probed.

[in] Alignment

Specifies the required alignment of the structure. This parameter is expressed as the number of bytes in the base data type. For example, an alignment of 1 indicates that Address be aligned on a BYTE boundary, 2 specifies alignment on a WORD boundary, and 4 specifies alignment on a DWORD boundary.

Return value

None

Remarks

EngProbeForReadAndWrite causes an exception to be raised if the structure pointed to by Address:

  • Does not have a base address that begins on an alignment-byte boundary.
  • Is not both read- and write-accessible.

Requirements

   
Minimum supported client Available in Windows 2000 and later versions of the Windows operating systems.
Target Platform Universal
Header winddi.h (include Winddi.h)
Library Win32k.lib
DLL Win32k.sys

See also

EngProbeForRead