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Problems using SetWindowLong and GWL_USERDATA

Problems using SetWindowLong and GWL_USERDATA. Ok, I made a class CBWindow as a base class, I have no problem initialy getting the this* into my WndProc, ...

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查詢 「GWL_USERDATA」的人也找了：

  1. gwl_userdata is undefined
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  7. SetWindowLong C#
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