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Calling C++ class methods via a function pointer
...myfunction (arg);.
This kind of thing is fairly common when using the old Win32 APIs, which were originally designed for C rather than C++. Of course in that case, the parameter is normally LPARAM or similar rather than a pointer, and some casting is needed.
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How to echo with different colors in the Windows command line
...know that the color bf command sets the colors of the whole command line window but I wanted to to print one single line in a different color.
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NSObject +load and +initialize - What do they do?
...ories define the same method on the same class, one of the methods will “win” and be used, and the other method will never be called.
The initialize Method
The runtime calls the initialize method on a class object just before sending the first message (other than load or initialize) to the cla...
How to start two threads at “exactly” the same time
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@Santa - The Win32 API for example offers different primitives. One useful type is the manual reset event returned when you call CreateEvent. msdn.microsoft.com/en-us/library/ms686364%28VS.85%29.aspx
– ChaosPandion
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Retrieving the last record in each group - MySQL
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MySQL 8.0 now supports windowing functions, like almost all popular SQL implementations. With this standard syntax, we can write greatest-n-per-group queries:
WITH ranked_messages AS (
SELECT m.*, ROW_NUMBER() OVER (PARTITION BY name ORDER BY id...
Android微信智能心跳方案 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...Line在国内的轮询策略
3、台湾（不使用GCM）：
从IBG同事win和guang提供的测试数据中看到，台湾使用的策略跟国内的轮询策略类似。
2.3 微信
微信没有使用GCM，自己维护TCP长连接，使用固定心跳。
2.4心跳典型值
What...
Should I use #define, enum or const?
...disadvantages of a single approach. I work in embedded systems so the following solution is based on the fact that integer and bitwise operators are fast, low memory & low in flash usage.
Place the enum in a namespace to prevent the constants from polluting the global namespace.
namespace Reco...
How do I set a cookie on HttpClient's HttpRequestMessage
...oded");
httpRequestMessage.Headers.Add("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Safari/537.36");
httpRequestMessage.Headers.Add("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,imag...
How to get users to read error messages?
...always miss them! No matter how hard you'll try... At one stage during the Win 95 UI testing before it was launched, MS carried out an experiment to read the UI (ed - it should be noted that the message explicitly stated in the context of 'Look under the chair'), with a $100 dollar bill taped to the...
What's the point of OOP?
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I think the use of opaque context objects (HANDLEs in Win32, FILE*s in C, to name two well-known examples--hell, HANDLEs live on the other side of the kernel-mode barrier, and it really doesn't get much more encapsulated than that) is found in procedural code too; I'm struggling...