VC ++ registry operations

 

1. New item

 

For example, create an item Yantai under HKEY_LOCAL_MACHINE/software/, and then create a new item bandsoft under Yantai.

Hkey hsoftkey;

Hkey maid;

Hkey hcompanykey;

// Open HKEY_LOCAL_MACHINE/software

If (regopenkeyex (HKEY_LOCAL_MACHINE, _ T ("software"), 0, key_write | key_read,

& Hsoftkey) = error_success)

{

DWORD dw;

// Create and open HKEY_LOCAL_MACHINE/software/Yantai

If (regcreatekeyex (hsoftkey, _ T ("Yantai"), 0, reg_none,

Reg_option_non_volatile, key_write | key_read, null,

& Maid, & DW) = error_success)

{

// Create and enable HKEY_LOCAL_MACHINE/software/Yantai/bandsoft

If (regcreatekeyex (maid, _ T ("bandsoft"), 0, reg_none,

Reg_option_non_volatile, key_write | key_read, null,

& Hcompanykey, & DW) = error_success)

{

Regclosekey (hsoftkey );

Regclosekey (maid );

Regclosekey (hcompanykey );

}

}

}

---------------------------------------------------------------------------

2. Create a new string value under the item

For example, create a new string value named "productname" REG_SZ "under" bandsoft "; Data: fd900 System

The code above is as follows:

Hkey hcompanykey;

// Open HKEY_LOCAL_MACHINE/software/Yantai/bandsoft

If (regopenkeyex (HKEY_LOCAL_MACHINE, _ T ("software // Yantai // bandsoft"), 0, key_write | key_read, & hcompanykey) = error_success)

{

Cstring STR = "fd900 system ";

// Add 1 as the final null character of the string/0 reserved space

Lpbyte lpdata = new byte [Str. getlength () + 1];

For (INT I = 0; I <Str. getlength (); I ++)

{

* (Lpdata + I) = Str. getat (I );

}

DWORD cbdata = Str. getlength () + 1;

// New Value

If (regsetvalueex (hcompanykey, _ T ("productname"), 0, REG_SZ, lpdata, cbdata )! = Error_success)

MessageBox ("error ");

Delete [] lpdata;

}

Else

MessageBox ("error ");

Regclosekey (hcompanykey );

------------------------------------------------------------------

3. Create a value of the REG_DWORD type under the item

For example, to create a value of the DWORD type under item bandsoft: Number, type REG_DWORD, data: 2

Hkey maid;

Hkey hcompanykey;

DWORD dw;

If (error_success! = Regopenkeyex (HKEY_LOCAL_MACHINE, _ T ("software // Yantai"), 0, key_write, & maid ))

MessageBox ("error ");

// Open HKEY_LOCAL_MACHINE/software/Yantai/bandsoft. If the bandsoft item does not exist, create

If (error_success! = Regcreatekeyex (maid, "bandsoft", 0, reg_none, reg_option_non_volatile, key_all_access, null, & hcompanykey, & DW ))

MessageBox ("error ");

// Name of the value of the DWORD type created under item bandsoft: Number type REG_DWORD, data: 2

DWORD dwvalue = 2;

Char szname [] = "Number ";

If (error_success! = Regsetvalueex (hcompanykey, szname, 0, REG_DWORD, (lpbyte) & dwvalue, sizeof (dwvalue )))

MessageBox ("error ");

Regclosekey (maid );

Regclosekey (hcompanykey );

You can see from the Registry that the name of the bandsoft item is: Number, type REG_DWORD, data: 0x00000002 (2)

Bytes -----------------------------------------------------------------------------------------

5. string value under the query item

For example, query the value of the string productname under bandsoft.

Hkey hcompanykey;

// Open HKEY_LOCAL_MACHINE/software/Yantai/bandsoft

If (regopenkeyex (HKEY_LOCAL_MACHINE, _ T ("software // Yantai // bandsoft"), 0,

Key_write | key_read, & hcompanykey) = error_success)

{

Lpbyte lpdata = new byte [80];

DWORD cbdata = 80;

DWORD dwtype = REG_SZ;

If (regqueryvalueex (hcompanykey, "productname", 0, & dwtype, lpdata, & cbdata)

= Error_success)

{

// Convert lpdata to cstring type

Cstring strvalue;

Strvalue = cstring (lpdata );

// Strvalue is the value you want to query

MessageBox (strvalue); // output fd900 System

}

Else

MessageBox ("error ");

Delete [] lpdata;

}

Else

MessageBox ("error ");

Regclosekey (hcompanykey );

Bytes -------------------------------------------------------------------------------------

6. All key values under the enumerated items

For example, enumerate all key values in HKEY_LOCAL_MACHINE/software/Microsoft/Windows/CurrentVersion/run under the startup Item,

And display it with the list box control:

Clistbox m_list;

Hkey hautorunkey;

DWORD dwindex = 0;

Long lresult;

If (regopenkeyex (HKEY_LOCAL_MACHINE, _ T ("software // Microsoft // windows // CurrentVersion // Run "),

0, key_read, & hautorunkey) = error_success)

{

Char szname [100];

DWORD cbname = 100;

Char szvalue [100];

DWORD cbvalue = 100;

Cstring strtemp;

Lresult = regenumvalue (hautorunkey, dwindex, szname, & cbname, 0, null, (lpbyte) szvalue, & cbvalue );

While (lresult = error_success & lresult! = Error_no_more_items)

{

Strtemp. Format ("Name: % s value: % s", szname, szvalue );

M_list.addstring (strtemp );

Dwindex = dwindex + 1;

// Be sure to assign a new value to the cbname and cbvalue. Because the value has changed, this error is not found until one day.

Cbname = 100;

Cbvalue = 100;

Lresult = regenumvalue (hautorunkey, dwindex, szname, & cbname, 0, null, (lpbyte) szvalue, & cbvalue );

}

}

Else

{

MessageBox ("error ");

}

Regclosekey (hautorunkey );

---------------------------------------------------------------------------------

7. All subitems under the enumerated items

For example, enumerate all the sub-items under HKEY_LOCAL_MACHINE/software and display them with the list box control.

Clistbox m_list

Hkey;

DWORD dwindex = 0;

Long lresult;

If (regopenkeyex (HKEY_LOCAL_MACHINE, _ T ("software "),

0, key_read, & hkey) = error_success)

{

Char szkeyname [100];

DWORD cbname = 100;

Lresult = regenumkeyex (hkey, dwindex, szkeyname, & cbname, 0, null );

While (lresult = error_success & lresult! = Error_more_data)

{

M_list.addstring (szkeyname );

Dwindex = dwindex + 1;

// Be sure to assign a value to the cbname again because the value has changed; otherwise, the next regeumkeyex error occurs.

Cbname = 100;

Lresult = regenumkeyex (hkey, dwindex, szkeyname, & cbname, 0, null );

}

}

Else

{

MessageBox ("error ");

}

Regclosekey (hkey );

-------------------------------------------------------------------------------

8. Delete the key value under the item

For example, delete the startup Item HKEY_LOCAL_MACHINE/software/Microsoft/Windows/CurrentVersion/run

Jfproc

Hkey hautorunkey;

// Open HKEY_LOCAL_MACHINE/software/Microsoft/Windows/CurrentVersion/run

If (error_success = regopenkeyex (HKEY_LOCAL_MACHINE, _ T ("software/Microsoft // windows // CurrentVersion // Run "),

0, key_write, & hautorunkey ))

{

Char szvalue [] = "jfproc ";

If (regdeletevalue (hautorunkey, szvalue )! = Error_success)

MessageBox ("error ");

}

Else

MessageBox ("error ");

Regclosekey (hautorunkey );

-----------------------------------------------------------------

9. delete an item (only applicable when there is no subitem under this item)

For example, deleting bandsoft under HKEY_LOCAL_MACHINE/software/Yantai/

Hkey;

// Open HKEY_LOCAL_MACHINE/software/Yantai

If (error_success = regopenkeyex (HKEY_LOCAL_MACHINE, _ T ("software // Yantai "),

0, key_write, & hkey ))

{

Char szkey [] = "bandsoft ";

If (Regdeletekey(Hkey, szkey )! = Error_success)

MessageBox ("error ");

}

Else

MessageBox ("error ");

Regclosekey (hkey );

------------------------------------------------------------------------

10. delete items (this option also applies if there are subitems)

Programming ideology:

Delete all the sub-items under this item, and then delete this item from the bottom up.

ExploitationRegdeletekeyThe returned value is not error_success when you delete an item (the item has a subitem,

Shdeleteemptykey should be used for items without a key value. I don't think it is necessary to useRegdeletekeyYou can,

Because each entry in the registry must contain a default name that is null, the data type is REG_SZ, and the value is also the key value of an empty string.

Function of the custom delete item

Bool deletekey (hkey, char * szsubkey)

{

If (error_success =Regdeletekey(Hkey, szsubkey ))

Return true;

// Open an entry

Hkey hsubkey;

// Not only the key_write permission is required, but also the key_read permission is required when the subitem is enumerated. I have found this error for a long time.

If (regopenkeyex (hkey, szsubkey, 0, key_write | key_read, & hsubkey )! = Error_success)

Return false;

// Delete a subitem

DWORD dwindex = 0;

Long lresult;

Char szname [100];

DWORD cbname = 100;

Lresult = regenumkeyex (hsubkey, dwindex, szname, & cbname, 0, null );

While (lresult = error_success & lresult! = Error_more_data)

{

// Recursively delete key

Deletekey (hsubkey, szname );

// Be sure to assign a value to the cbname again because the value has changed; otherwise, the next regeumkeyex error occurs.

Cbname = 100;

// Do not add dwindex = dwindex + 1,

// After the first sub-item is deleted, the second sub-item is changed to the first sub-item, always keeping dwindex = 0,

// This error was made by myself. After debugging, I found the answer for half a day.

Lresult = regenumkeyex (hsubkey, dwindex, szname, & cbname, 0, null );

}

Regclosekey (hsubkey );

// After the sub-item under the item is deleted, the item can be deleted now.

Regdeletekey(Hkey, szsubkey );

Return true;

}

Example: For the Yantai item in HKEY_LOCAL_MACHINE/software/Yantai/bandsoft,

The Yantai item has the Sub-item bandsoft. Therefore, the preceding custom deletekey function is used to delete the Yantai item. The Code is as follows:

Hkey;

// Open HKEY_LOCAL_MACHINE/software

If (error_success = regopenkeyex (HKEY_LOCAL_MACHINE, _ T ("software "),

0, key_write, & hkey ))

{

If (! Deletekey (hkey, "Yantai "))

MessageBox ("error ");

}

Else

MessageBox ("error ");

Regclosekey (hkey );