public static UInt32 SetCustomContext <InteropHandle>(
GetContextFunc <InteropHandle> getContextFunc,
Func <InteropHandle, IntPtr, UInt32> setContextFunc,
InteropHandle handle,
Object customContext)
{
// Get the current context pointer and release on completion
IntPtr contextPtrOld;
UInt32 err = getContextFunc(
handle,
out contextPtrOld);
if (PartyError.SUCCEEDED(err))
{
var contextPtr = IntPtr.Zero;
if (customContext != null)
{
contextPtr = GCHandle.ToIntPtr(GCHandle.Alloc(customContext));
}
err = setContextFunc(
handle,
contextPtr);
if (PartyError.SUCCEEDED(err))
{
if (contextPtrOld != IntPtr.Zero)
{
GCHandle contextGcHandle = GCHandle.FromIntPtr(contextPtrOld);
contextGcHandle.Free();
}
}
else
{
if (contextPtr != IntPtr.Zero)
{
GCHandle contextGcHandle = GCHandle.FromIntPtr(contextPtr);
contextGcHandle.Free();
}
}
}
return(err);
}
public static UInt32 GetCustomContext <InteropHandle>(
GetContextFunc <InteropHandle> getContextFunc,
InteropHandle handle,
out Object customContext)
{
customContext = null;
IntPtr contextPtr;
UInt32 err = getContextFunc(handle, out contextPtr);
if (PartyError.SUCCEEDED(err))
{
if (contextPtr != IntPtr.Zero)
{
GCHandle contextGcHandle = GCHandle.FromIntPtr(contextPtr);
customContext = (Object)contextGcHandle.Target;
}
}
return(err);
}
