IOCTL_CHANGER_GET_PARAMETERS - NtDoc

Native API online documentation, based on the System Informer (formerly Process Hacker) phnt headers 
// ntddchgr.h

// CTL_CODE(0x0030, 0x000, METHOD_BUFFERED, FILE_READ_ACCESS)
#define IOCTL_CHANGER_GET_PARAMETERS 0x00304000
View the official Windows Driver Kit DDI reference
// winioctl.h

// CTL_CODE(0x0030, 0x000, METHOD_BUFFERED, FILE_READ_ACCESS)
#define IOCTL_CHANGER_GET_PARAMETERS 0x00304000
View the official Win32 API reference

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Windows Driver Kit DDI reference (ni-ntddchgr-ioctl_changer_get_parameters)

IOCTL_CHANGER_GET_PARAMETERS IOCTL

Description

Returns the parameters of the device.

Parameters

Major code

Input buffer

None.

Input buffer length

None.

Output buffer

The driver returns the GET_CHANGER_PARAMETERS data in the buffer at Irp->AssociatedIrp.SystemBuffer.

Output buffer length

Parameters.DeviceIoControl.OutputBufferLength in the I/O stack location indicates the size, in bytes, of the parameter buffer, which must be >= sizeof(GET_CHANGER_PARAMETERS).

Input/output buffer

Input/output buffer length

Status block

The Information field is set to the number of bytes returned. The Status field is set to STATUS_SUCCESS, or possibly to STATUS_INFO_LENGTH_MISMATCH or STATUS_INSUFFICIENT_RESOURCES.

See also

GET_CHANGER_PARAMETERS

View the official Windows Driver Kit DDI reference

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Win32 API reference (ni-winioctl-ioctl_changer_get_parameters)

IOCTL_CHANGER_GET_PARAMETERS IOCTL

Description

Retrieves the parameters of the specified device.

To perform this operation, call the DeviceIoControl function with the following parameters.

BOOL DeviceIoControl(
  (HANDLE) hDevice,             // handle to device
  IOCTL_CHANGER_GET_PARAMETERS, // dwIoControlCode
  NULL,                         // lpInBuffer
  0,                            // nInBufferSize
  (LPVOID) lpOutBuffer,         // output buffer
  (DWORD) nOutBufferSize,       // size of output buffer
  (LPDWORD) lpBytesReturned,    // number of bytes returned
  (LPOVERLAPPED) lpOverlapped   // OVERLAPPED structure
);

Parameters

Input buffer

Input buffer length

Output buffer

Output buffer length

Input/output buffer

Input/output buffer length

Status block

Irp->IoStatus.Status is set to STATUS_SUCCESS if the request is successful.

Otherwise, Status to the appropriate error condition as a NTSTATUS code.

For more information, see NTSTATUS Values.

See also

View the official Win32 API reference

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