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Overview |
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Group |
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Quick Info
Windows NT
| Yes
| Win95
| Yes
| Win32s
| No
| Import Library
| advapi32.lib
| Header File
| winreg.h
| Unicode
| WinNT
| Platform Notes
| None
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RegQueryInfoKey
The RegQueryInfoKey function retrieves information about a specified registry key.
LONG RegQueryInfoKey (
HKEY hKey,
| // handle of key to query
| LPTSTR lpClass,
| // address of buffer for class string
| LPDWORD lpcbClass,
| // address of size of class string buffer
| LPDWORD lpReserved,
| // reserved
| LPDWORD lpcSubKeys,
| // address of buffer for number of subkeys
| LPDWORD lpcbMaxSubKeyLen,
| // address of buffer for longest subkey name length
| LPDWORD lpcbMaxClassLen,
| // address of buffer for longest class string length
| LPDWORD lpcValues,
| // address of buffer for number of value entries
| LPDWORD lpcbMaxValueNameLen,
| // address of buffer for longest value name length
| LPDWORD lpcbMaxValueLen,
| // address of buffer for longest value data length
| LPDWORD lpcbSecurityDescriptor,
| // address of buffer for security descriptor length
| PFILETIME lpftLastWriteTime
| // address of buffer for last write time
| );
|
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Parameters
hKey
Identifies a currently open key or any of the following predefined reserved
handle values:
HKEY_CLASSES_ROOT
HKEY_CURRENT_USER
HKEY_LOCAL_MACHINE
HKEY_USERS
lpClass
Points to a buffer that receives the key's class name. This parameter can be
NULL.
lpcbClass
Points to a variable that specifies the size, in characters, of the buffer
pointed to by the lpClass parameter. This size should include the terminating null character. When the
function returns, this variable contains the length of the class string stored
in the buffer. The count returned does not include the terminating null
character. If the buffer is not big enough, the function returns ERROR_MORE_DATA, and
the variable contains the size of the string, in characters, without counting
the null character.
If lpClass is NULL, lpcbClass can be NULL.
Windows NT: If the lpClass parameter is a valid address, but the lpcbClass parameter is not (for example, it is NULL), the function returns
ERROR_INVALID_PARAMETER.
Windows 95: If the lpClass parameter is a valid address, but the lpcbClass parameter is not (for example, it is NULL), the function returns
ERROR_SUCCESS instead of ERROR_INVALID_PARAMETER. To ensure compatibility with other
platforms, verify that lpcbClass is valid before calling the function.
lpReserved
Reserved; must be NULL.
lpcSubKeys
Points to a variable that receives the number of subkeys contained by the
specified key. This parameter can be NULL.
lpcbMaxSubKeyLen
Points to a variable that receives the length, in characters, of the key's
subkey with the longest name. The count returned does not include the terminating
null character. This parameter can be NULL.
lpcbMaxClassLen
Points to a variable that receives the length, in characters, of the longest
string specifying a subkey class. The count returned does not include the
terminating null character. This parameter can be NULL.
lpcValues
Points to a variable that receives the number of values associated with the
key. This parameter can be NULL.
lpcbMaxValueNameLen
Points to a variable that receives the length, in characters, of the key's
longest value name. The count returned does not include the terminating null
character. This parameter can be NULL.
lpcbMaxValueLen
Points to a variable that receives the length, in bytes, of the longest data
component among the key's values. This parameter can be NULL.
lpcbSecurityDescriptor
Points to a variable that receives the length, in bytes, of the key's security
descriptor. This parameter can be NULL.
lpftLastWriteTime
Pointer to a FILETIME structure. This parameter can be NULL.
If you are querying the registry on a computer running Windows NT, the
function sets the members of the FILETIME structure to indicate the last time that the key or any of its value entries
was modified.
If you are querying the registry on a computer running Windows 95, the
function sets the members of the FILETIME structure to zero. This is because the Windows 95 operating system does not
keep track of registry key last write time information.
Return Values
If the function succeeds, the return value is ERROR_SUCCESS.
If the function fails, the return value is a nonzero error code defined in
WINERROR.H. You can use the FormatMessage function with the FORMAT_MESSAGE_FROM_SYSTEM flag to get a generic
description of the error.
Remarks
The key identified by the hKey parameter must have been opened with KEY_QUERY_VALUE access (KEY_READ access
includes KEY_QUERY_VALUE access).
See Also
FILETIME, RegDeleteKey, RegEnumKey, RegEnumKeyEx, RegEnumValue, RegQueryValue, RegQueryValueEx
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