RegEnumKeyExW not return all name sub-keys
I want to enumerate name of key. but. is there something wrong here. it don't return all name. i checks subKeys it return 12 total Keys. when loop in RegEnumKeyExW it only return 3 name not 12 name. it only return 1,2 and 5 name key
in key HKEY_CURRENT_USER. there're 12 Keys.
AppEvents
Console
Control Panel
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System
Volatile Environment
This the code
HKEY hKey;
if (RegOpenKeyExW(HKEY_CURRENT_USER, NULL, 0, KEY_READ, &hKey) == ERROR_SUCCESS)
{
DWORD subKeys;
FILETIME ftLastWriteTime;
if (RegQueryInfoKeyW(hKey, NULL, NULL, NULL, &subKeys, NULL, NULL, NULL, NULL, NULL, NULL, &ftLastWriteTime) == ERROR_SUCCESS)
{
wchar_t keyName[MAX_KEY_LENGTH];
DWORD cbName;
for (DWORD i = 0; i < subKeys; i++)
{
if (RegEnumKeyExW(hKey, i, keyName, &cbName, NULL, NULL, NULL, &ftLastWriteTime) == ERROR_SUCCESS)
{
std::wcout << keyName << std::endl;
}
else
{
std::cout << GetLastError() << std::endl;
}
}
}
else
{
std::cout << GetLastError() << std::endl;
}
}
else
{
std::cout << GetLastError() << std::endl;
}
c++ windows visual-studio winapi
asked Nov 23 '18 at 7:35
mursh damir
1
add a comment |
I want to enumerate name of key. but. is there something wrong here. it don't return all name. i checks subKeys it return 12 total Keys. when loop in RegEnumKeyExW it only return 3 name not 12 name. it only return 1,2 and 5 name key
in key HKEY_CURRENT_USER. there're 12 Keys.
AppEvents
Console
Control Panel
Environment
EUDC
Identities
Keyboard Layout
Network
Printers
Software
System
Volatile Environment
This the code
HKEY hKey;
if (RegOpenKeyExW(HKEY_CURRENT_USER, NULL, 0, KEY_READ, &hKey) == ERROR_SUCCESS)
{
DWORD subKeys;
FILETIME ftLastWriteTime;
if (RegQueryInfoKeyW(hKey, NULL, NULL, NULL, &subKeys, NULL, NULL, NULL, NULL, NULL, NULL, &ftLastWriteTime) == ERROR_SUCCESS)
{
wchar_t keyName[MAX_KEY_LENGTH];
DWORD cbName;
for (DWORD i = 0; i < subKeys; i++)
{
if (RegEnumKeyExW(hKey, i, keyName, &cbName, NULL, NULL, NULL, &ftLastWriteTime) == ERROR_SUCCESS)
{
std::wcout << keyName << std::endl;
}
else
{
std::cout << GetLastError() << std::endl;
}
}
}
else
{
std::cout << GetLastError() << std::endl;
}
}
else
{
std::cout << GetLastError() << std::endl;
}
c++ windows visual-studio winapi
asked Nov 23 '18 at 7:35
mursh damir
1
Try to open key with fewer rights,RegEnumKeyExWonly requiresKEY_ENUMERATE_SUB_KEYS. You don't need to callRegQueryInfoKeyWfirst, just loop untilRegEnumKeyExWfails.
– zett42
Nov 23 '18 at 7:51
3
at first Reg api not setGetLastError()but return error code. at second - your error in not initializecbNamein callRegEnumKeyExW. this is in-out parameter and before call must specifies the size of the buffer specified by thelpNameparameter, in characters. so must be&(cbName = RTL_NUMBER_OF(keyName))in your code
– RbMm
Nov 23 '18 at 7:52
1
When an API function does not behave as expected you must re-read the documentation. One of the things you will there is how the error handling is performed for this function, and indeed all the registry api functions.
– David Heffernan
Nov 23 '18 at 8:33
1
Fix: DWORD cbName = MAX_KEY_LENGTH; Right now it works by accident for the first subkey and can only work again when the name is shorter. So indeed 1, 2 and 5.
– Hans Passant
Nov 23 '18 at 9:52
add a comment |
I want to enumerate name of key. but. is there something wrong here. it don't return all name. i checks subKeys it return 12 total Keys. when loop in RegEnumKeyExW it only return 3 name not 12 name. it only return 1,2 and 5 name key
in key HKEY_CURRENT_USER. there're 12 Keys.
AppEvents
Console
Control Panel
Environment
EUDC
Identities
Keyboard Layout
Network
Printers
Software
System
Volatile Environment
This the code
HKEY hKey;
if (RegOpenKeyExW(HKEY_CURRENT_USER, NULL, 0, KEY_READ, &hKey) == ERROR_SUCCESS)
{
DWORD subKeys;
FILETIME ftLastWriteTime;
if (RegQueryInfoKeyW(hKey, NULL, NULL, NULL, &subKeys, NULL, NULL, NULL, NULL, NULL, NULL, &ftLastWriteTime) == ERROR_SUCCESS)
{
wchar_t keyName[MAX_KEY_LENGTH];
DWORD cbName;
for (DWORD i = 0; i < subKeys; i++)
{
if (RegEnumKeyExW(hKey, i, keyName, &cbName, NULL, NULL, NULL, &ftLastWriteTime) == ERROR_SUCCESS)
{
std::wcout << keyName << std::endl;
}
else
{
std::cout << GetLastError() << std::endl;
}
}
}
else
{
std::cout << GetLastError() << std::endl;
}
}
else
{
std::cout << GetLastError() << std::endl;
}
c++ windows visual-studio winapi
asked Nov 23 '18 at 7:35
mursh damir
1
I want to enumerate name of key. but. is there something wrong here. it don't return all name. i checks subKeys it return 12 total Keys. when loop in RegEnumKeyExW it only return 3 name not 12 name. it only return 1,2 and 5 name key
in key HKEY_CURRENT_USER. there're 12 Keys.
AppEvents
Console
Control Panel
Environment
EUDC
Identities
Keyboard Layout
Network
Printers
Software
System
Volatile Environment
This the code
HKEY hKey;
if (RegOpenKeyExW(HKEY_CURRENT_USER, NULL, 0, KEY_READ, &hKey) == ERROR_SUCCESS)
{
DWORD subKeys;
FILETIME ftLastWriteTime;
if (RegQueryInfoKeyW(hKey, NULL, NULL, NULL, &subKeys, NULL, NULL, NULL, NULL, NULL, NULL, &ftLastWriteTime) == ERROR_SUCCESS)
{
wchar_t keyName[MAX_KEY_LENGTH];
DWORD cbName;
for (DWORD i = 0; i < subKeys; i++)
{
if (RegEnumKeyExW(hKey, i, keyName, &cbName, NULL, NULL, NULL, &ftLastWriteTime) == ERROR_SUCCESS)
{
std::wcout << keyName << std::endl;
}
else
{
std::cout << GetLastError() << std::endl;
}
}
}
else
{
std::cout << GetLastError() << std::endl;
}
}
else
{
std::cout << GetLastError() << std::endl;
}
c++ windows visual-studio winapi
c++ windows visual-studio winapi
asked Nov 23 '18 at 7:35
mursh damir
1
asked Nov 23 '18 at 7:35
mursh damir
1
asked Nov 23 '18 at 7:35
mursh damir
1
asked Nov 23 '18 at 7:35
mursh damir
1
asked Nov 23 '18 at 7:35
mursh damir
1
1
Try to open key with fewer rights,RegEnumKeyExWonly requiresKEY_ENUMERATE_SUB_KEYS. You don't need to callRegQueryInfoKeyWfirst, just loop untilRegEnumKeyExWfails.
– zett42
Nov 23 '18 at 7:51
3
at first Reg api not setGetLastError()but return error code. at second - your error in not initializecbNamein callRegEnumKeyExW. this is in-out parameter and before call must specifies the size of the buffer specified by thelpNameparameter, in characters. so must be&(cbName = RTL_NUMBER_OF(keyName))in your code
– RbMm
Nov 23 '18 at 7:52
1
When an API function does not behave as expected you must re-read the documentation. One of the things you will there is how the error handling is performed for this function, and indeed all the registry api functions.
– David Heffernan
Nov 23 '18 at 8:33
1
Fix: DWORD cbName = MAX_KEY_LENGTH; Right now it works by accident for the first subkey and can only work again when the name is shorter. So indeed 1, 2 and 5.
– Hans Passant
Nov 23 '18 at 9:52
add a comment |
Try to open key with fewer rights,RegEnumKeyExWonly requiresKEY_ENUMERATE_SUB_KEYS. You don't need to callRegQueryInfoKeyWfirst, just loop untilRegEnumKeyExWfails.
– zett42
Nov 23 '18 at 7:51
3
at first Reg api not setGetLastError()but return error code. at second - your error in not initializecbNamein callRegEnumKeyExW. this is in-out parameter and before call must specifies the size of the buffer specified by thelpNameparameter, in characters. so must be&(cbName = RTL_NUMBER_OF(keyName))in your code
– RbMm
Nov 23 '18 at 7:52
1
When an API function does not behave as expected you must re-read the documentation. One of the things you will there is how the error handling is performed for this function, and indeed all the registry api functions.
– David Heffernan
Nov 23 '18 at 8:33
1
Fix: DWORD cbName = MAX_KEY_LENGTH; Right now it works by accident for the first subkey and can only work again when the name is shorter. So indeed 1, 2 and 5.
– Hans Passant
Nov 23 '18 at 9:52
Try to open key with fewer rights,
RegEnumKeyExW only requires KEY_ENUMERATE_SUB_KEYS. You don't need to call RegQueryInfoKeyW first, just loop until RegEnumKeyExW fails.– zett42
Nov 23 '18 at 7:51
Try to open key with fewer rights,
RegEnumKeyExW only requires KEY_ENUMERATE_SUB_KEYS. You don't need to call RegQueryInfoKeyW first, just loop until RegEnumKeyExW fails.– zett42
Nov 23 '18 at 7:51
3
3
at first Reg api not set
GetLastError() but return error code. at second - your error in not initialize cbName in call RegEnumKeyExW. this is in-out parameter and before call must specifies the size of the buffer specified by the lpName parameter, in characters. so must be &(cbName = RTL_NUMBER_OF(keyName)) in your code– RbMm
Nov 23 '18 at 7:52
at first Reg api not set
GetLastError() but return error code. at second - your error in not initialize cbName in call RegEnumKeyExW. this is in-out parameter and before call must specifies the size of the buffer specified by the lpName parameter, in characters. so must be &(cbName = RTL_NUMBER_OF(keyName)) in your code– RbMm
Nov 23 '18 at 7:52
1
1
When an API function does not behave as expected you must re-read the documentation. One of the things you will there is how the error handling is performed for this function, and indeed all the registry api functions.
– David Heffernan
Nov 23 '18 at 8:33
When an API function does not behave as expected you must re-read the documentation. One of the things you will there is how the error handling is performed for this function, and indeed all the registry api functions.
– David Heffernan
Nov 23 '18 at 8:33
1
1
Fix: DWORD cbName = MAX_KEY_LENGTH; Right now it works by accident for the first subkey and can only work again when the name is shorter. So indeed 1, 2 and 5.
– Hans Passant
Nov 23 '18 at 9:52
Fix: DWORD cbName = MAX_KEY_LENGTH; Right now it works by accident for the first subkey and can only work again when the name is shorter. So indeed 1, 2 and 5.
– Hans Passant
Nov 23 '18 at 9:52
add a comment |
1 Answer
1
active
oldest
votes
As @Hans Passant says, You should reset the length of cbName, But actually not the MAX_KEY_LENGTH. If the buff length is not enough for the key name, RegEnumKeyExW will get failure. Add parameter in RegQueryInfoKeyW above to get the max length of the subkey name:
DWORD cbMaxSubKeyLen;
if (RegQueryInfoKeyW(hKey, NULL, NULL, NULL, &subKeys, &cbMaxSubKeyLen, NULL, NULL, NULL, NULL, NULL, &ftLastWriteTime) == ERROR_SUCCESS)
Then in the for loop, reset the cbName = cbMaxSubKeyLen;
answered Nov 26 '18 at 3:41
Drake Wu
1274
It is okay to query for the size. But then it is also very, very, very important to reallocate keyName so it is big enough. Buffer overflow is quite a nasty bug.
– Hans Passant
Dec 2 '18 at 9:40
add a comment |
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As @Hans Passant says, You should reset the length of cbName, But actually not the MAX_KEY_LENGTH. If the buff length is not enough for the key name, RegEnumKeyExW will get failure. Add parameter in RegQueryInfoKeyW above to get the max length of the subkey name:
DWORD cbMaxSubKeyLen;
if (RegQueryInfoKeyW(hKey, NULL, NULL, NULL, &subKeys, &cbMaxSubKeyLen, NULL, NULL, NULL, NULL, NULL, &ftLastWriteTime) == ERROR_SUCCESS)
Then in the for loop, reset the cbName = cbMaxSubKeyLen;
answered Nov 26 '18 at 3:41
Drake Wu
1274
It is okay to query for the size. But then it is also very, very, very important to reallocate keyName so it is big enough. Buffer overflow is quite a nasty bug.
– Hans Passant
Dec 2 '18 at 9:40
add a comment |
As @Hans Passant says, You should reset the length of cbName, But actually not the MAX_KEY_LENGTH. If the buff length is not enough for the key name, RegEnumKeyExW will get failure. Add parameter in RegQueryInfoKeyW above to get the max length of the subkey name:
DWORD cbMaxSubKeyLen;
if (RegQueryInfoKeyW(hKey, NULL, NULL, NULL, &subKeys, &cbMaxSubKeyLen, NULL, NULL, NULL, NULL, NULL, &ftLastWriteTime) == ERROR_SUCCESS)
Then in the for loop, reset the cbName = cbMaxSubKeyLen;
answered Nov 26 '18 at 3:41
Drake Wu
1274
It is okay to query for the size. But then it is also very, very, very important to reallocate keyName so it is big enough. Buffer overflow is quite a nasty bug.
– Hans Passant
Dec 2 '18 at 9:40
add a comment |
As @Hans Passant says, You should reset the length of cbName, But actually not the MAX_KEY_LENGTH. If the buff length is not enough for the key name, RegEnumKeyExW will get failure. Add parameter in RegQueryInfoKeyW above to get the max length of the subkey name:
DWORD cbMaxSubKeyLen;
if (RegQueryInfoKeyW(hKey, NULL, NULL, NULL, &subKeys, &cbMaxSubKeyLen, NULL, NULL, NULL, NULL, NULL, &ftLastWriteTime) == ERROR_SUCCESS)
Then in the for loop, reset the cbName = cbMaxSubKeyLen;
answered Nov 26 '18 at 3:41
Drake Wu
1274
As @Hans Passant says, You should reset the length of cbName, But actually not the MAX_KEY_LENGTH. If the buff length is not enough for the key name, RegEnumKeyExW will get failure. Add parameter in RegQueryInfoKeyW above to get the max length of the subkey name:
DWORD cbMaxSubKeyLen;
if (RegQueryInfoKeyW(hKey, NULL, NULL, NULL, &subKeys, &cbMaxSubKeyLen, NULL, NULL, NULL, NULL, NULL, &ftLastWriteTime) == ERROR_SUCCESS)
Then in the for loop, reset the cbName = cbMaxSubKeyLen;
answered Nov 26 '18 at 3:41
Drake Wu
1274
answered Nov 26 '18 at 3:41
Drake Wu
1274
answered Nov 26 '18 at 3:41
Drake Wu
1274
answered Nov 26 '18 at 3:41
Drake Wu
1274
1274
It is okay to query for the size. But then it is also very, very, very important to reallocate keyName so it is big enough. Buffer overflow is quite a nasty bug.
– Hans Passant
Dec 2 '18 at 9:40
add a comment |
It is okay to query for the size. But then it is also very, very, very important to reallocate keyName so it is big enough. Buffer overflow is quite a nasty bug.
– Hans Passant
Dec 2 '18 at 9:40
It is okay to query for the size. But then it is also very, very, very important to reallocate keyName so it is big enough. Buffer overflow is quite a nasty bug.
– Hans Passant
Dec 2 '18 at 9:40
It is okay to query for the size. But then it is also very, very, very important to reallocate keyName so it is big enough. Buffer overflow is quite a nasty bug.
– Hans Passant
Dec 2 '18 at 9:40
add a comment |
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Try to open key with fewer rights,
RegEnumKeyExWonly requiresKEY_ENUMERATE_SUB_KEYS. You don't need to callRegQueryInfoKeyWfirst, just loop untilRegEnumKeyExWfails.– zett42
Nov 23 '18 at 7:51
3
at first Reg api not set
GetLastError()but return error code. at second - your error in not initializecbNamein callRegEnumKeyExW. this is in-out parameter and before call must specifies the size of the buffer specified by thelpNameparameter, in characters. so must be&(cbName = RTL_NUMBER_OF(keyName))in your code– RbMm
Nov 23 '18 at 7:52
1
When an API function does not behave as expected you must re-read the documentation. One of the things you will there is how the error handling is performed for this function, and indeed all the registry api functions.
– David Heffernan
Nov 23 '18 at 8:33
1
Fix: DWORD cbName = MAX_KEY_LENGTH; Right now it works by accident for the first subkey and can only work again when the name is shorter. So indeed 1, 2 and 5.
– Hans Passant
Nov 23 '18 at 9:52