Unsupported System Functions in Windows Forms
Most PowerBuilder system functions are supported in Windows Forms applications.
This table lists
categories of system functions that are not supported.
|
Category |
Functions |
|---|---|
|
DDE functions |
CloseChannel, ExecRemote, GetCommandDDE, GetCommandDDEOrigin, GetDataDDE, GetDataDDEOrigin, GetRemote, OpenChannel, RespondRemote, SetDataDDE, SetRemote, StartHotLink, StartServerDDE, StopHotLink, StopServerDDE |
|
Garbage collection functions |
GarbageCollectGetTimeLimit, GarbageCollectSetTimeLimit |
|
Miscellaneous functions |
PBGetMenuString |
|
Input method functions |
IMEGetCompositionText, IMEGetMode, IMESetMode |
|
Profiling and tracing functions |
TraceBegin, TraceClose, TraceDisableActivity, TraceDump, TraceEnableActivity, TraceEnd, TraceError, TraceOpen, TraceUser |
IsNull function
In .NET applications, if you call the IsNull function
with a variable of a reference type (a type derived from the PowerObject
base class) as the argument, IsNull returns true when the variable has not been initialized by assigning an instantiated
object to it. To ensure consistent behavior between standard and
.NET PowerBuilder applications, use the IsValid function
to check whether the variable has been instantiated.