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MFC OnKeyDown没反应，不响应键盘操作 - C/C++ - 清泛网 - 专注C/C++及内核技术
...了消息映射后， 发现无论按下键盘的哪个键OnKeyDown函数体都没有被执行。基于对话框的程序是无法直接响应键盘消息的，需要重载虚函数PreTranslateMessage()。
解决方案（重载PreTranslateMessage函数）：
virtual BOOL PreTranslateMessage(MSG*...
MFC 获取当前时间的几种方法总结 - C/C++ - 清泛网 - 专注C/C++及内核技术
...e.GetHour(), curTime.GetMinute(), curTime.GetSecond());
2.SYSTEMTIME结构体获取当前时间
SYSTEMTIME curTime;
GetLocalTime(&curTime);
CString strCurTime;
strCurTime.Format(_T("d/d/d d:d:d"), curTime.wYear, curTime.wMonth, curTime.wDay, curTime.wHour, curTime.wMinute, curTime.wSecond);...
c++编译错误：invalid new-expression of abstract class type - c++1y / s...
...。
另外，void fun() { } 空函数体也是实现。
纯虚函数相当于C#中abstract抽象类。
=0 说明函数是抽象的方法，谁继承它就必须实现它
否则不能new。
What is the best Battleship AI?
...
Here is my entry! (The most naive solution possible)
"Random 1.1"
namespace Battleship
{
using System;
using System.Collections.ObjectModel;
using System.Drawing;
public class RandomOpponent : IBattleshipOpponent
{
public s...
AI2 Keep Awake
...r the CPU to be constantly active. Instead, an alarm can be used (see UrsAI2Alarm ). Motivation For some projects it is necessary to prevent the associated app from being deactivated by the operating system. A typical example would be that sensor data should be sent regularly to an MQTT bro...
Why do we check up to the square root of a prime number to determine if it is prime?
...es this might be useful, but this all heavily depends on implementation details (programming language, hardware, data types, libraries), none of which are known in this general consideration.
– Sven Marnach
Aug 3 at 9:38
...
Discuz轻松生成sitemaps.xml网站地图 - 更多技术 - 清泛网 - 专注C/C++及内核技术
Discuz轻松生成sitemaps.xml网站地图discuz_sitemaps只针对论坛版块生成sitemaps xml：●建立一个名为cron_sitemaps php的文件；●复制以下代码区的内容到cron_sitemaps php中，并保存文件；PS：注意编码，选择自己DZ对应的编码，我 只针对论坛...
How to change the CHARACTER SET (and COLLATION) throughout a database?
...TER DATABASE <database_name> CHARACTER SET utf8 COLLATE utf8mb4_0900_ai_ci;
change table collation:
ALTER TABLE <table_name> CONVERT TO CHARACTER SET utf8 COLLATE utf8mb4_0900_ai_ci;
change column collation:
ALTER TABLE <table_name> MODIFY <column_name> VARCHAR(255) CHARACT...
Store query result in a variable using in PL/pgSQL
...on't leave out the table name prefix on test_table.name or you'll get complaints about an ambiguous reference.
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SEH stack 结构探索（1）--- 从 SEH 链的最底层（线程第1个SEH结构）说起 -...
...
push ebp
mov ebp, esp
在 不改变 esp 的情况下，使用人工设置 stack frame 是有目的的，最终这块区域将变成一个 EXCEPTION_REGISTRATION_RECORD 结构，将 ebp 移至 esp + 10 处，也就是ntdll32!_SEH_prolog4() 的第 1 个参数（14h 处）
这时...