cdc

How to open / get available drivers from a USB device connected to Android?

由 僤鯓⒐⒋嵵緔 提交于 2019-12-13 06:27:32
问题 I made a similar post about how I can best send data to and receive data from a USB device connected to Android using the native API. Someone turned me toward a library for serial communication, so I'm trying to understand how to use that. I'm only using some of the example code so far just to see something working, but I'm stuck on trying to open the USB device. Here's a verbose print out of the USB device I'm using. It's a CDC device that should echo back what is sent to it. Here's that

Error while executing change data capture sql query

由 ε祈祈猫儿з 提交于 2019-12-13 01:55:19
问题 I am getting this error "An insufficient number of arguments were supplied for the procedure or function cdc.fn_cdc_get_all_changes_" while trying to execute the following sql query. use SpatialDB go declare @begin_time datetime, @end_time datetime, @from_lsn binary(10), @to_lsn binary(10); set @begin_time=GETDATE()-1; set @end_time=GETDATE(); set @from_lsn=sys.fn_cdc_map_time_to_lsn('smallest greater than or equal', @begin_time); set @to_lsn=sys.fn_cdc_map_time_to_lsn('largest greater than

MFC CDC类中的BUG及替代方案&CPaintDC、CClientDC及CWindowDC的使用

由 早过忘川 提交于 2019-12-12 09:01:13
MFC CDC类中的BUG及替代方案 在MFC中，最常用的绘图类非CDC类莫属。CDC类可以完成绝大多数的绘图操作。适量的绘图用CDC类不会有什么问题，但是，绘图量一大起来，程序就经常莫名其妙的崩溃，而且除了CResourceException异常外没有更多的崩溃信息，这种情形一般是CDC类的内存泄露导致的。CDC类每Release一次就会因GDI对象未彻底回收导致的4KB的内存泄露(不要问我怎么知道的，我在写一个音频播放器时用了CDC类以每秒24帧的速度绘制它的波形图，结果十分钟就崩掉了。后面排查发现，就是这CDC对象惹的祸。而且，在微软发布的BUG清单中，就有CDC这玩意的身影)。一般在发生时，可以在任务管理器中的GDI对象中发现GDI对象数量上升，在Visual Studio的诊断会话中也会发现内存占用率的上升。在GDI对象数接近极端值时，对话框的绘制开始变得混乱，一旦GDI对象数超过极端值，程序便会崩溃。但是，办法总是有的，下面是我总结出的几种解决方法。 1、使用CDC的子类 CDC类较为常用的子类有CPaintDC、CClientDC、CWindowDC三种。为了更好地使用它们，我们要先了解他们的作用。 类名 用途 CPaintDC 一般用于与WM_PAINT消息对应的onPaint函数中，只能用于客户区绘图，用于维持窗口完整

Big performance difference (1hr to 1 minute ) found in SQL. Can you explain why?

由 ぃ、小莉子 提交于 2019-12-12 02:35:53
问题 The following queries are taking 70 minutes and 1 minute respectively on a standard machine for 1 million records. What could be the possible reasons? Query [01:10:00] SELECT * FROM cdc.fn_cdc_get_net_changes_dbo_PartitionTest( CASE WHEN sys.fn_cdc_increment_lsn(0x00)<sys.fn_cdc_get_min_lsn('dbo_PartitionTest') THEN sys.fn_cdc_get_min_lsn('dbo_PartitionTest') ELSE sys.fn_cdc_increment_lsn(0x00) END , sys.fn_cdc_get_max_lsn() , 'all with mask') WHERE __$operation <> 1 Modified Query [00:01:10]

CDC::DrawText详解

由 谁说我不能喝 提交于 2019-12-12 01:10:49
函数原型　 　int DrawText( 　　HDC hDC, // 设备描述表句柄 　　LPCTSTR lpString, // 将要绘制的字符串 　　int nCount, // 字符串的长度 　　LPRECT lpRect, // 指向矩形结构RECT的指针 　　UINT uFormat // 正文的绘制选项 　　); 参数　 hdc： 　　[输入]设备环境句柄。 　　lpString： 　　[输入]指向将被写入的字符串的指针，如果参数nCount是-1，则字符串必须是以/0结束的。 如果uFormat包含DT_MODIFYSTRING，则函数可为此字符串增加4个字符，存放字符串的缓冲区必须足够大，能容纳附加的字符。 　　nCount： 　　[输入]指向字符串中的字符数。如果nCount为-1，则lpString指向的字符串被认为是以/0结束的，DrawText会自动计算字符数。 　　lpRect： 　　[输入/输出]指向结构RECT的指针，其中包含文本将被置于其中的矩形的信息（按逻辑坐标）。 　　uFormat： 　　[输入]指定格式化文本的方法。它可以下列值的任意组合，各值描述如下： 　　 值 说明 DT_BOTTOM 将正文调整到矩形底部。此值必须和DT_SINGLELINE组合。 DT_CALCRECT 决定矩形的宽和高。 　　如果正文有多行

MFC Printing with CDC just works on some Printers

由 China☆狼群 提交于 2019-12-11 09:40:37
问题 I'm implementing a Printing Function in a big Project to print so called gadgets (derived from CWnd). In the Gadget Class I've created a Function to Render it to the Device Context PrintPageContent(CDC * pDC, const CRect & rContent, int page, int numPages) { PrintWindow(pDC, PW_CLIENTONLY); pDC->Rectangle(rContent.left,rContent.top, rContent.right, rContent.bottom); } To Render the Gadget easily I thought about using the PrintWindow Function https://msdn.microsoft.com/en-us/library/x51z0shh

In SQL Server CDC with SSIS, which data should be stored for windowing (LSN or Date)?

由 时光毁灭记忆、已成空白 提交于 2019-12-11 07:49:37
问题 I have implemented delta detection while loading data warehouse from transaction systems using an identity column or date-time column in source transaction tables. When data needs to be extracted next time, the maximum date-time value extracted last time is used in the filter of extraction query to identify new or changed records. This was good enough except when there were multiple transactions at the same milli second. But now we have Change Data Capture (CDC) with SQL Server 2008 and it

Error while enabling CDC on table level

由 若如初见. 提交于 2019-12-10 15:25:39
问题 I am enabling Change data capture (CDC) on SQL server 2012 Enterprise edition(11.0.2100.60) . I am able to enable it on Database level with below SQL, but failed to enable on Table level. Use DatabaseName GO Exec sys.sp_cdc_enable_db GO EXEC sys.sp_cdc_enable_table @source_schema = N'dbo' ,@source_name = N'TableName' , @role_name = NULL GO Got Error like, 'msg 22832, Level 16, State 1, Procedure sp_cdc_enable_table_internal, Line 623 Could not update the metadata that indicates table [dbo].

Sql Server Change Data Capture: Preserving history when adding columns?

由 只谈情不闲聊 提交于 2019-12-09 17:56:14
问题 When a new column is added to table that is configured for change data capture (cdc), the capture instance table will not have the new column until cdc is disabled and re-enabled for the source table. In the process the existing capture instance is dropped. I thought I could copy existing data out to a temp table and then copy back using the following SQL. However, other CDC meta information, such as the cdc.change_tables.start_lsn, becomes invalid. How can the capture instance history be

What does LSN mean in SQL Server?

由 不想你离开。 提交于 2019-12-08 16:33:31
问题 What is the meaning of Log Sequence Number? I know that it is of type binary and 10bytes long and it corresponds to the time the transaction happen in DB. But is this a high precision date-time value that is stored in some efficient binary format or is this a function of date-time and something else (for example the serial number of transactions that happen at the same milli second). I did a lot of searching but couldn't find a good answer to this. Can any one explain with a formula or
订阅 cdc