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MFC学习总结 (90个技巧) dlg 上建立View - C/C++ - 清泛网 - 专注C++内核技术

MFC学习总结 (90个技巧) dlg 上建立View1.属性页的添加:创建对话框的类,该类要从CpropertyPage继承;然后在要添加该对话框为 属性页的类(头文件)里创建CpropertySheet类的一 [page]属性页的添加[/page]1.属性页的添加: 创建对话框...
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How to find all combinations of coins when given some dollar value

...r any other convenient computer algebra system) to compute the answer for 10^10^6 dollars in a couple seconds in three lines of code. (And this was long enough ago that that’s a couple of seconds on a 75Mhz Pentium...) sh...
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Avoid trailing zeroes in printf()

...ormat specifiers. The closest you could get would be: printf("%.6g", 359.013); // 359.013 printf("%.6g", 359.01); // 359.01 but the ".6" is the total numeric width so printf("%.6g", 3.01357); // 3.01357 breaks it. What you can do is to sprintf("%.20g") the number to a string buffer then man...
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iOS White to Transparent Gradient Layer is Gray

... clearColor has a black color channel with an alpha of 0, so I had to use [UIColor colorWithWhite:1 alpha:0] and it works fine. share | improve this answer | ...
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Change Active Menu Item on Page Scroll?

... 207 It's done by binding to the scroll event of the container (usually window). Quick example: //...
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How to extract text from a string using sed?

... The pattern \d might not be supported by your sed. Try [0-9] or [[:digit:]] instead. To only print the actual match (not the entire matching line), use a substitution. sed -n 's/.*\([0-9][0-9]*G[0-9][0-9]*\).*/\1/p' ...
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unable to start mongodb local server

...Cumulo Nimbus 5,87455 gold badges3939 silver badges6060 bronze badges answered Jan 31 '13 at 12:03 morphymorphy 1,77911 gold badge...
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Check if a string contains a string in C++

... Guy Avraham 2,48022 gold badges2929 silver badges4040 bronze badges answered Feb 26 '10 at 8:24 Matthieu N.Matthieu N...
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C++ performance challenge: integer to std::string conversion

... #include <string> const char digit_pairs[201] = { "00010203040506070809" "10111213141516171819" "20212223242526272829" "30313233343536373839" "40414243444546474849" "50515253545556575859" "60616263646566676869" "70717273747576777879" "80818283848586...
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How to check if hex color is “too black”?

...Int(c, 16); // convert rrggbb to decimal var r = (rgb >> 16) & 0xff; // extract red var g = (rgb >> 8) & 0xff; // extract green var b = (rgb >> 0) & 0xff; // extract blue var luma = 0.2126 * r + 0.7152 * g + 0.0722 * b; // per ITU-R BT.709 if (luma < 40) { ...