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📄 4.2.4 事件方式.htm

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<H3 style="TEXT-INDENT: 0cm"><FONT face=楷体_GB2312 size=4><SPAN lang=EN-US 
style="mso-fareast-language: ZH-CN">4.2.4 </SPAN><SPAN 
style="FONT-FAMILY: 楷体_GB2312; mso-fareast-language: ZH-CN; mso-ascii-font-family: 'Times New Roman'">事件方式</SPAN><SPAN 
lang=EN-US style="mso-fareast-language: ZH-CN"><o:p></o:p></SPAN></FONT></H3>
<P class=MsoBodyTextIndent><SPAN style="mso-fareast-language: ZH-CN"><FONT 
face=楷体_GB2312 
size=4>当某一台设备被设置成事件方式，程序和设备将同时工作。从设备输入的数据都可存放在一个事件队列或输入队列中。所有被设置成事件方式的输入数据（或事件）都可存放在一个事件队列中。在任一个时刻，事件队列按输入数据的顺序存放数据，并含有一个最大的数据类型项，在队列中的输入数据可按照逻辑设备类型、工作站号、物理设备编码进行检索。在应用程序中，检索事件队列可用下述命令：<SPAN 
lang=EN-US><o:p></o:p></SPAN></FONT></SPAN></P>
<P class=MsoBodyTextIndent><SPAN lang=EN-US><FONT face=楷体_GB2312 
size=4>await_event(time,device_class,ws,device_code)<o:p></o:p></FONT></SPAN></P>
<P class=MsoBodyTextIndent style="TEXT-INDENT: 0cm"><SPAN lang=EN-US 
style="mso-fareast-language: ZH-CN"><FONT face=楷体_GB2312 
size=4>time是应用程序设置的最长等待时间，当事件队列为空时，事件处理进程就挂起，直到最长等待时间已过或又有一个事件进入，才恢复事件处理进程。若在输入数据之前，等待时间就已过去，则参数device_class就返回一个空值。当time被赋成零或当队列为空，程序就立即返回到其它的处理过程。<o:p></o:p></FONT></SPAN></P>
<P class=MsoBodyTextIndent><SPAN style="mso-fareast-language: ZH-CN"><FONT 
face=楷体_GB2312 size=4>当用<SPAN 
lang=EN-US>await_event命令使某设备进入事件输入控制方式，而且事件队列为非空时，在队列的第一个事件就被传送到当前事件记录中，对于定位器、笔划设备、在device_class参数中存放了它们的类型。为了从当前事件记录中检索一个输入的数据，还需要采用一个事件输入方式命令，其格式类似与请求、取样方式的命令，但在此命令中不需要有工作站和设备码参数，因为在数据记录中已有这些参数。用户可用下述命令从当前事件记录中得到一个定位数据：<o:p></o:p></SPAN></FONT></SPAN></P>
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