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What are the differences between poll and select?
...
The basic difference is that select()'s fd_set is a bit mask and
therefore has some fixed size. It would be possible for the kernel to
not limit this size when the kernel is compiled, allowing the
application to define FD_SETSIZE to whatever it wants (as the comments
in the system header...
How do BitTorrent magnet links work?
For the first time I used a magnet link . Curious about how it works, I looked up the specs and didn't find any answers. The wiki says xt means "exact topic" and is followed by the format ( btih in this case) with a SHA1 hash. I saw base32 mentioned, knowing it's 5 bits per character and 32 char...
Where should I put tags in HTML markup?
...dy> section is bad, too, since the JavaScript will have to be parsed before the page is rendered completely (or something like that). This seems to leave the end of the <body> section as a logical place for <script> tags.
...
ATL COM开发入门（一）（JS调用ActiveX/COM组件） - C/C++ - 清泛网 - 专注C/C++及内核技术
...接口方法：ConcatStr，并定义接口参数
这时，AtlDemo.idl文件中新增了一个接口：
interface IAtlDemoIf : IDispatch{
[id(1)] HRESULT ConcatStr([in] BSTR* pStr1, [in] BSTR* pStr2, [out,retval] BSTR* pRetStr);
};
AtlDemoIf.h中新增了一个公开成员函数：
S...
CreateWindow()动态创建一个EditBox - C/C++ - 清泛网 - 专注C/C++及内核技术
...了EditBox，需要处理其输入事件，如下：
先给它设置一个ID（可以在resource.h中指定）
m_wndEdit = CreateWindow(_T("EDIT"), 0, WS_CHILD | WS_VISIBLE | ES_WANTRETURN,
70, 4, 60, 16, m_hWnd, (HMENU)IDC_EDIT_SEARCH, (HINSTANCE)GetWindowLong(m_hWnd, GW...
MFC中MDI消息处理流程 - C/C++ - 清泛网 - 专注C/C++及内核技术
...为：
1) MDI主窗口(CMDIFrameWnd)收到命令消息WM_COMMAND，其ID位ID_XXX；
2) MDI主窗口将消息传给当前活动的MDI子窗口(CMDIChildWnd)；
3) MDI子窗口给自己的子窗口(View)一个处理机会，将消息交给View；
4) View检查自己Message Map；
5) ...
Picture Control(图片控件)中静态显示位图，解决位图不显示的问题 - C/C++ ...
...Picture Control(图片控件)中静态显示位图，代码如下：
void CShowBmpDlg::OnBnClickedButton1()
{
//从资源中加载图片
CBitmap bitmap;
//加载指定位图资源 Bmp图片ID
bitmap.LoadBitmap(IDB_BITMAP1);
//获取对话框上的句柄 图片控件ID
...
mfc 获取控件在对话框上的位置 - C/C++ - 清泛网 - 专注C/C++及内核技术
...框上的位置请看代码，亲测有效：CRect rect;GetDlgItem(控件ID)->GetWindowRect(&rect); 获取控件的屏幕坐标ScreenToClient(&rect); 转换为对...请看代码，亲测有效：
CRect rect;
GetDlgItem(控件ID)->GetWindowRect(&rect); //获取控件的屏幕坐标
ScreenToC...
C# 操作MongoDb插入、更新、查询 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...on != null)
{
foreach (var col in collection)
{
string id = MongoDataHelper.GetString(col, "_id");
}
}
提示函数过期警告：
warning CS0618: “MongoDB.Driver.MongoServer.Create(string)”已过时:“Use MongoClient.GetServer instead.”
解决：
MongoServer s...
PHP常用API函数用法 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...
$url = "https://www.tsingfun.com/index.php?m=content&c=content&a=edit&catid=37&id=289&pc_hash=c6svGs";
$params = explode('&', $url);
print_r($params);
?>
结果：
Array
(
[0] => https://www.tsingfun.com/index.php?m=content
[1] => c=content
[2] => a=edit
[3] => catid=37
[4] => i...