EnumPrinterDataEx function

The EnumPrinterDataEx function enumerates all value names and data for a specified printer and key.

Printer data is stored in the registry. While enumerating printer data, do not call registry functions that might change the data.


DWORD EnumPrinterDataEx(
  _In_  HANDLE  hPrinter,
  _In_  LPCTSTR pKeyName,
  _Out_ LPBYTE  pEnumValues,
  _In_  DWORD   cbEnumValues,
  _Out_ LPDWORD pcbEnumValues,
  _Out_ LPDWORD pnEnumValues


hPrinter [in]

A handle to the printer for which the function retrieves configuration data. Use the OpenPrinter or AddPrinter function to retrieve a printer handle.

pKeyName [in]

A pointer to a null-terminated string that specifies the key containing the values to enumerate. Use the backslash ( \ ) character as a delimiter to specify a path with one or more subkeys. EnumPrinterDataEx enumerates all values of the key, but does not enumerate values of subkeys of the specified key. Use the EnumPrinterKey function to enumerate subkeys.

If pKeyName is NULL or an empty string, EnumPrinterDataEx returns ERROR_INVALID_PARAMETER.

pEnumValues [out]

A pointer to a buffer that receives an array of PRINTER_ENUM_VALUES structures. Each structure contains the value name, type, data, and sizes of a value under the key.

cbEnumValues [in]

The size, in bytes, of the buffer pointed to by pcbEnumValues. If you set cbEnumValues to zero, the pcbEnumValues parameter returns the required buffer size.

pcbEnumValues [out]

A pointer to a variable that receives the size, in bytes, of the retrieved configuration data. If the buffer size specified by cbEnumValues is too small, the function returns ERROR_MORE_DATA and pcbEnumValues indicates the required buffer size.

pnEnumValues [out]

A pointer to a variable that receives the number of PRINTER_ENUM_VALUES structures returned in pEnumValues.

Return value

If the function succeeds, the return value is ERROR_SUCCESS.

If the function fails, the return value is a system error code.


Note  This is a blocking or synchronous function and might not return immediately. How quickly this function returns depends on run-time factors such as network status, print server configuration, and printer driver implementation—factors that are difficult to predict when writing an application. Calling this function from a thread that manages interaction with the user interface could make the application appear to be unresponsive.

EnumPrinterDataEx retrieves printer configuration data set by the SetPrinterDataEx and SetPrinterData functions.


Minimum supported client

Windows 2000 Professional [desktop apps only]

Minimum supported server

Windows 2000 Server [desktop apps only]


Winspool.h (include Windows.h)





Unicode and ANSI names

EnumPrinterDataExW (Unicode) and EnumPrinterDataExA (ANSI)

See also

Print Spooler API Functions