dll kernel32 RtlFillMemory issue

[conanjou]

I write one QM code as below:
Macro Macro16

Code:

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dll- kernel32 RtlFillMemory !&Destination !Length !Fill
RtlFillMemory("#100D7B77" 1 1)

but I dont know if it is correct or error, because it doesn't work.

or do you have any other method to achieve the same goal?

Thanks for your advices in advance.