笔记存档

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统计宽字节的字符串长度

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wchar_t *p="aaa";  
int len=wcslen(p2);

CString 转 char *

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CString str("aaa");
CSringA tmp;    
tmp=str; 
char *p=tmp.GetBuffer();

事件对象与互斥对象都属于内核对象

添加自定义消息

  1. 定义消息宏

Eg: 

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#define WM_RECVDATA WM_USER+1
  1. 在头文件中添加消息响应函数原型声明

Eg: 

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afx_msg LRESULT OnrecvData(WPARAM wParam,LPARAM lParam);
  1. 在源文件中BEGIN_MESSAGE_MAP( )和END_MESSAGE_MAP()之间添加消息映射，不要写在 //}}AFX_MSG_MAP宏之间

Eg: 

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ON_MESSAGE(WM_RECVDATA,OnRecvData)

  1. 编写消息响应函数的实现

  2. 在引发或发出消息的地方使用SendMessage或PostMessage发送消息

类的动态创建

在头文件中添加DECLARE_DYNCREATE(class_name)宏，源文件中添加IMPLEMENT_DYNCREATE(class_name , base_class_name)宏。

Sublime快捷键设置

  1. Ctrl + hjkl 快速移动光标,在首选项->快捷键设置中添加以下代码 

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    [
    	{ "keys": ["ctrl+h"], "command": "move", "args": {"by": "characters", "forward": false} },
    	{ "keys": ["ctrl+l"], "command": "move", "args": {"by": "characters", "forward": true} },
    	{ "keys": ["ctrl+k"], "command": "move", "args": {"by": "lines", "forward": false} },
    	{ "keys": ["ctrl+j"], "command": "move", "args": {"by": "lines", "forward": true} },
    	{ "keys": ["ctrl+shift+h"], "command": "move", "args": {"by": "words", "forward": false} },
    	{ "keys": ["ctrl+shift+l"], "command": "move", "args": {"by": "word_ends", "forward": true} },
    ]

  2. 开启vim模式

在用户设置中将Vintage从ignored_packages中删除

SQL 同时count多个表的数据

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SELECT SUM(Info),SUM(K),SUM(Raw) FROM (

 SELECT COUNT(*) Info,0 K,0 Raw FROM information

 UNION ALL

 SELECT 0 Info,COUNT(*) K,0 Raw FROM kline

 UNION ALL

 SELECT 0 Info,0 K,COUNT(*) Raw FROM update1

)t;