RegistryGetDWORD
A version of this page is also available for
4/8/2010
This function reads REG_DWORD registry values.
Syntax
HRESULT WINAPI RegistryGetDWORD(
HKEY hKey,
LPCTSTR pszSubKey,
LPCTSTR pszValueName,
DWORD* pdwData
);
Parameters
- hKey
[in] Handle to the open key or a predefined root value.
- pszSubKey
[in] Key where the value is stored. If this value is NULL, then pszValueName is assumed to be under hkey.
- pszValueName
[in] Named value to retrieve. If this value is NULL, the function retrieves the default value.
- pdwData
[out] A pointer to the buffer that will receive the data.
Return Value
The following table shows the return values for this function.
| Value | Description |
|---|---|
S_OK |
Data is copied to the buffer. |
E_INVALIDARG |
Invalid hkey or pdwData. |
E_DATATYPE_MISMATCH |
The value is not type REG_DWORD. |
An error value returned by RegOpenKey or RegQueryValueEx. |
Error value wrapped as a FACILITY_WIN32 HRESULT. |
Remarks
Success indicates that the value is copied to the buffer pointed to by pdwData. Failure does not cause any change.
The header file snapi.h contains definitions for the registry keys, paths, values, and bitmasks for all the base notifications that are provided by the system.
If the key pointed to by hkey and pszSubkey does not exist, the function fails.
Code Example
The following code example demonstrates how to use RegistryGetDWORD.
Note
To make the following code example easier to read, security checking and error handling are not included. This code example should not be used in a release configuration unless it has been modified to include them.
DWORD GetNumberOfBlueToothConnections()
{
DWORD cBluetoothConnections = 0;
HRESULT hr;
hr = RegistryGetDWORD(SN_CONNECTIONSBLUETOOTHCOUNT_ROOT,
SN_CONNECTIONSBLUETOOTHCOUNT_PATH,
SN_CONNECTIONSBLUETOOTHCOUNT_VALUE,
&cBluetoothConnections);
if (SUCCEEDED(hr))
return cBluetoothConnections;
else
return 0;
Requirements
| Header | regext.h |
| Library | aygshell.lib |
| Windows Embedded CE | Windows Embedded CE 6.0 and later |
| Windows Mobile | Pocket PC for Windows Mobile Version 5.0 and later, Smartphone for Windows Mobile Version 5.0 and later |
See Also
Reference
State and Notifications Broker Functions
State and Notifications Broker Reference
Concepts
Using the State and Notifications Broker in Native Code