public static void CheckError(IntPtr error)
{
if (error != IntPtr.Zero)
{
string message = Marshal.PtrToStringAnsi(error);
Native.leveldb_free(error);
throw new LevelDBException(message);
}
}
public bool TryGet(ReadOptions options, Slice key, out Slice value)
{
UIntPtr length;
IntPtr error;
IntPtr v = Native.leveldb_get(handle, options.handle, key.buffer, (UIntPtr)key.buffer.Length, out length, out error);
if (error != IntPtr.Zero)
{
Native.leveldb_free(error);
value = default(Slice);
return(false);
}
if (v == IntPtr.Zero)
{
value = default(Slice);
return(false);
}
value = new Slice(v, length);
Native.leveldb_free(v);
return(true);
}
public Slice Get(ReadOptions options, Slice key)
{
UIntPtr length;
IntPtr error;
IntPtr value = Native.leveldb_get(handle, options.handle, key.buffer, (UIntPtr)key.buffer.Length, out length, out error);
try
{
NativeHelper.CheckError(error);
if (value == IntPtr.Zero)
{
throw new LevelDBException("not found");
}
return(new Slice(value, length));
}
finally
{
if (value != IntPtr.Zero)
{
Native.leveldb_free(value);
}
}
}