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I think the issue is you are using a cast, try using io.wchar.to_string() [https://valadoc.org/glib-2.0/uint64.to_string.html] Edit: This worked for me based on your code, casting gave me a segfault. struct Monitor.IO { public uint64 wchar; } int main (string[] args) { Monitor.IO io = {}; io.wchar = 111111; warning (io.wchar.to_string ()); ...


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