IOCTL_DISK_PERFORMANCE
The IOCTL_DISK_PERFORMANCE
DeviceIoControl
operation provides disk performance information.
dwIoControlCode = IOCTL_DISK_PERFORMANCE; // operation code
lpInBuffer = NULL; // address of input buffer; not
used; must be NULL
nInBufferSize = 0; // size of input buffer; not
used; must be zero
lpOutBuffer;
// address of output buffer
nOutBufferSize;
// size of output buffer
lpBytesReturned;
// address of actual bytes of output
Parameters
lpInBuffer
Points to an
input buffer. Not used with this operation. Set to NULL.
nInBufferSize
Specifies the
size, in bytes, of the buffer pointed to by lpInBuffer. Not used with
this operation. Set to zero.
lpOutBuffer
Points to a
buffer that will receive a DISK_PERFORMANCE data structure.
nOutBufferSize
Specifies the
size, in bytes, of the buffer pointed to by lpOutBuffer, which must be
large enough to contain a DISK_PERFORMANCE data structure.
lpBytesReturned
Points to a DWORD
that receives the actual size, in bytes, of the data stored into lpOutBuffer.
Return Values
If the
operation succeeds, DeviceIoControl returns TRUE.
If the
operation fails, DeviceIoControl returns FALSE. To get extended error
information, call GetLastError.
Remarks
This device
I/O control operation is for disk devices.
See Also