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並前往https://coderedirect.com/questions/639454/alpha-channel-in-devicecontext-hdc

[Solved] C++ Alpha channel in DeviceContext (HDC) - Code ...

Than call DrawFrameControl to this dc. All works, but in memory there are 4 bytes per pixel and alpha channel fills by 00. Even if there were FF before.

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查詢 「DrawFrameControl」的人也找了：

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