CTL_CODE - NtDoc
Native API online documentation, based on the System Informer
(formerly Process Hacker) phnt
headers
// d4drvif.h
void CTL_CODE(
DeviceType,
Function,
Method,
Access
);
View the official Windows Driver Kit DDI referenceNo description available.
The d4drvif.h CTL_CODE macro defines IOCTLs for the DOT4 virtual printer port protocol that enables a multi-function printing device to simultaneously send and receive data packets on a single physical channel.
DeviceTypeContains the value for FILE_DEVICE_DOT4 (0x3a).
FunctionContains the IOCTL Function value (IOCTL_DOT4_USER_BASE base value of 2049 + IOCTL-specific value of 0-9).
MethodContains the method codes for how buffers are passed for I/O and FS controls:
| Method code | Value |
|---|---|
| METHOD_BUFFERED | 0 |
| METHOD_IN_DIRECT | 1 |
| METHOD_OUT_DIRECT | 2 |
| METHOD_NEITHER | 3 |
AccessContains the access check values:
| Method code | Value |
|---|---|
| FILE_ANY_ACCESS | 0x0000 |
| FILE_READ_ACCESS | 0x0001 |
| FILE_WRITE_ACCESS | 0x0002 |