READ_PORT_UCHAR function (wudfddi_hwaccess.h)

[Warning: UMDF 2 is the latest version of UMDF and supersedes UMDF 1. All new UMDF drivers should be written using UMDF 2. No new features are being added to UMDF 1 and there is limited support for UMDF 1 on newer versions of Windows 10. Universal Windows drivers must use UMDF 2. For more info, see Getting Started with UMDF.]

The READ_PORT_UCHAR function reads a byte from the specified port address.


  IWDFDevice3 *pDevice,
  PUCHAR      Port



[in] Specifies a pointer to the IWDFDevice3 interface for the device object of the device to access.


[in] Specifies the port address, which must be a mapped memory range in I/O space.

Return value

READ_PORT_UCHAR returns the byte that is read from the specified port address.


For more information, see Reading and Writing to Device Registers in UMDF 1.x Drivers.


End of support Unavailable in UMDF 2.0 and later.
Target Platform Desktop
Minimum UMDF version 1.11
Header wudfddi_hwaccess.h