Registry understanding and C ++ operation registry example (to be continued)

 

C ++RegistryOperation

1. Understanding of registry Composition

AndXPFile Management on the system is similar.

(1)Root Key: Total5.

Hkey_classes_root,HKEY_CURRENT_USER,

HKEY_LOCAL_MACHINE,HKEY_USERS,Hkey_current_config

It is equivalent to five disks.

(2)Zi Jian: You can have multiple key-value items and multiple sub-Keys.

For example:HKEY_LOCAL_MACHINE \ SYSTEM \ CurrentControlSet \ Control

Below isAGP,Arbiters. AndCurrentuser,SystemBootdevice and other key-value items.

The child key is equivalent to a folder with Multiple folders and files.

(3) Key-value items:3Components. Name, type, and data value.

Key-value items are equivalent to one file.

 

2,Open/CloseRegistry:

Regopenkeyex (

Hkey ,//Parent key handle

Lpsubkey ,//Child key handle

Dwoption ,//System reserved, specified0

Samdesired ,//Open permission

Phkresult ,//Return opening handle

)

 

// Open the key

Hkey key ;//Store returned valuesKeyMedium

Lpctstr DATA = _ T ("SOFTWARE \ Microsoft \ Windows \ CurrentVersion \ Run ");

If (regopenkeyex (HKEY_LOCAL_MACHINE, Data, 0, key_all_access, & Key) = error_success)

{;}

 

//Close key

Regclosekey (key );

 

3View the basic information of the key value and its sub-keys (equivalent to opening a directory)

Regqueryinfokey

Obtains the number of child keys, the longest name length in the Child key, the longest String Length in the Child key,

The number of key values, the longest name length in the key value, and the longest String Length in the key value.

 

4. traverse the child key information of a key

Regenumkeyex

 

5, Traverse the key value information of a key

Regenumvalue

 

Query a specified key value: regqueryvalueex ()

Set a specified key value: regsetvalueex ()

 

(To be continued)