Date: September 13, 2003 / year-entry #60 Tags: code Orig Link: https://blogs.msdn.microsoft.com/oldnewthing/20030913-00/?p=42523 Comments: 0 Summary: Exercise: Explain why we used 0x7FFF to represent infinite height. Answer: Commenter "Reiko" got this right. 0x7FFF is the maximum integer coordinate supported by Windows 95, 98 and Me. Exercise: Explain the line rcWindow.bottom += rcTemp.top. Answer: The more precise way of writing the line would have been rcWindow.bottom += (rcTemp.top - rcWindow.top) - (0...

 Exercise: Explain why we used 0x7FFF to represent infinite height. Answer: Commenter "Reiko" got this right. 0x7FFF is the maximum integer coordinate supported by Windows 95, 98 and Me. Exercise: Explain the line `rcWindow.bottom += rcTemp.top`. Answer: The more precise way of writing the line would have been ``` rcWindow.bottom += (rcTemp.top - rcWindow.top) - (0 - rcWindow.top); ``` The first term is the amount of non-client space consumed at the top of the window. The second term is the amount of non-client space consumed at the top of the window, taking wrapping into account. The difference, therefore is the amount by which AdjustWindowRectEx needs to be adjusted. But the two instances of `rcWindow.top` cancel out, leaving just `rcTemp.top`.

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