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4/8/2010

This method stores data in the value field of an open registry key on a remote Windows Embedded CE–based device. It can also set additional value and type information for the specified key.

Syntax 

LONG CeRegSetValueEx (
  HKEY 
hKey,
  LPCWSTR 
lpValueName,
  DWORD 
Reserved,
  DWORD 
dwType,
  LPBYTE 
lpData,
  DWORD 
cbData
);

Parameters

hKey

[in] Handle to a currently open key or any of the following predefined reserved handle values:

HKEY_CLASSES_ROOT

HKEY_CURRENT_USER

HKEY_LOCAL_MACHINE

HKEY_USERS

lpValueName

[in] Pointer to a string containing the name of the value to set. If a value with this name is not already present in the key, the function adds it to the key. If this parameter is NULL or an empty string, the function sets the type and data for the key's unnamed value. Registry keys do not have default values, but they can have one unnamed value, which can be of any type. The maximum length of a value name is 255, not including the terminating NULL character.

Reserved

[in] Reserved; must be zero.

dwType

[in] Specifies the type of information to be stored as the value's data. This parameter can be one of the following values.

Value Description

REG_BINARY

Binary data in any form.

REG_DWORD

A 32-bit number.

REG_DWORD_LITTLE_ENDIAN

A 32-bit number in little-endian format. This is equivalent to REG_DWORD.

In little-endian format, a multi-byte value is stored in memory from the lowest byte (the "little end") to the highest byte. For example, the value 0x12345678 is stored as (0x78 0x56 0x34 0x12) in little-endian format.

REG_DWORD_BIG_ENDIAN

A 32-bit number in big-endian format.

In big-endian format, a multi-byte value is stored in memory from the highest byte (the "big end") to the lowest byte. For example, the value 0x12345678 is stored as (0x12 0x34 0x56 0x78) in big-endian format.

REG_EXPAND_SZ

A null-terminated string that contains unexpanded references to environment variables (for example, "%PATH%").

REG_LINK

A Unicode symbolic link. Used internally; applications should not use this type.

REG_MULTI_SZ

An array of null-terminated strings, terminated by two null characters.

REG_NONE

No defined value type.

REG_RESOURCE_LIST

A device-driver resource list.

REG_SZ

A null-terminated string.

Do not use the REG_SZ type to store hard-coded paths to the system root directory or to the drive containing the system files. Instead, use the REG_EXPAND_SZ type with environment variables such as "%SystemRoot%". This ensures that the path will be up-to-date even if the user remaps the system drive to a different drive letter.
lpData

[in] Pointer to a buffer containing the data to be stored with the specified value name.

cbData

[in] Specifies the size, in bytes, of the information pointed to by the lpDataparameter. If the data is of type REG_SZ, REG_EXPAND_SZ, or REG_MULTI_SZ, cbDatamust include the size of the terminating null character. The maximum size of data allowed in Windows Embedded CE is 4 KB.

Return Value

ERROR_SUCCESS indicates success. A nonzero error code defined in Winerror.h indicates failure. To get a generic description of the error, call FormatMessagewith the FORMAT_MESSAGE_FROM_SYSTEM flag set.

Remarks

Value lengths are limited by available memory. Long values (more than 2048 bytes) should be stored as files with the file names stored in the registry. This helps the registry perform efficiently. Application elements such as icons, bitmaps, and executable files should be stored as files and not be placed in the registry.

The key identified by the hKeyparameter must have been opened with KEY_SET_VALUE access. To open the key, use the IRAPISession::CeRegCreateKeyExor IRAPISession::CeRegOpenKeyExfunction.

Requirements

Header rapi2.h
Library ole32.lib, rapiuuid.lib
Windows Embedded CE Windows Embedded CE 6.0 and later
Windows Mobile Windows Mobile Version 5.0 and later

See Also