ReadPreferenceDouble()

Syntax

Result.d = ReadPreferenceDouble(Key$, DefaultValue)

Try to read the specified associated 'Key$' value.

Parameters

Key$	The key to read the value from. If the key is inside a group, PreferenceGroup() has to be used to change the current group.
DefaultValue	The default value to return if the key isn't found or the preference file haven't been opened correctly (file missing for example).

Return value

The value associated to the specified key, as a double number. if the key isn't found the default value is returned.

Example

  ; Open a preference file
  OpenPreferences(#PB_Compiler_Home +"examples/sources/Data/test.pref")
  
  ; Open the group 'Window'
  PreferenceGroup("Window")
  
  ; Examine keys until w = 800
  NextPreferenceKey() ; x = 0
  NextPreferenceKey() ; y = 0
  NextPreferenceKey() ; w = 800
  
  ; Read the key
  key$ = PreferenceKeyName()
  
  ; Display the key and its data with different format
  MessageRequester("Integer key", Str(ReadPreferenceInteger(key$, 0)))
  MessageRequester("Float key", StrF(ReadPreferenceFloat(key$, 0), 6))
  MessageRequester("Double key", StrD(ReadPreferenceDouble(key$, 0), 15))
  MessageRequester("Long key", Str(ReadPreferenceLong(key$, 0)))
  MessageRequester("Quad key", Str(ReadPreferenceQuad(key$, 0)))
  MessageRequester("String key", ReadPreferenceString(key$, "0"))
    
  ; Close the preference file
  ClosePreferences() 

See Also

ReadPreferenceFloat(), ReadPreferenceInteger(), ReadPreferenceLong(), ReadPreferenceQuad(), ReadPreferenceString()

Supported OS

All