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4/8/2010

This function sets a REG_DWORD registry value.

Syntax 

HRESULT WINAPI RegistrySetDWORD( 
  HKEY 
hKey,
  LPCTSTR 
pszSubKey,
  LPCTSTR 
pszValueName,
  DWORD 
dwData 
);

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 pszValueNameis assumed to be under hkey.

pszValueName

[in] Named value to set. If this value is NULL, the function sets the default value.

dwData

[in] New value.

Return Value

The following table shows the return values for this function.

Value Description

S_OK

Value in pszValueNameis replaced by the value in dwData.

E_INVALIDARG

Invalid hkey.

E_DATATYPE_MISMATCH

The value is not type REG_DWORD.

An error value returned by RegOpenKeyor RegQueryValueEx.

Error value wrapped as a FACILITY_WIN32 HRESULT.

Remarks

Success indicates that the old value is replaced by the new value. Failure does cause any change.

If the key pointed to by hkeyand pszSubkeydoes not exist, the function fails.

If the client might be calling RegistrySetDWORDmultiple times, it should cache a handle to the key using RegOpenKeyExand pass the handle instead of passing a string value. Every time RegistrySetDWORDis called with a string value for the key, the RegOpenKeyExand RegCloseKeyfunctions are called, so passing a handle instead of a string value can avert a potential performance problem over mutltiple calls.

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