📄 sy0901.htm
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<p class=MsoNormal><span lang=EN-US>
</span><span style='font-family:宋体'>功能描述</span></p>
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<p class=MsoNormal><span lang=EN-US>TRUE</span></p>
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<p class=MsoNormal><span lang=EN-US>Clear To Send</span><span
style='font-family:宋体'>线为</span> <span style='font-family:宋体'>高电平</span></p>
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<p class=MsoNormal><span lang=EN-US>FALSE</span></p>
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<p class=MsoNormal><span lang=EN-US>Clear To Send</span><span
style='font-family:宋体'>线为</span> <span style='font-family:宋体'>低电平</span></p>
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<p class=MsoNormal style='text-indent:21.0pt'><span style='font-family:宋体'>该属性确定是否可通过查询</span><span
lang=EN-US>Clear To Send</span><span style='font-family:宋体'>（</span><span
lang=EN-US>CTS</span><span style='font-family:宋体'>）线的状态发送数据。</span><span
lang=EN-US>Clear To Send</span><span style='font-family:宋体'>是调制解调器发送到相联计算机的信号，指示传输可以进行。该属性在设计时无效，在运行时为只读。</span></p>
<p class=MsoNormal style='text-indent:21.0pt'><span style='font-family:宋体'>如果</span><span
lang=EN-US>Clear To Send</span><span style='font-family:宋体'>线为</span> <span
style='font-family:宋体'>低电平（</span><span lang=EN-US>CTSHolding</span><span
style='font-family:宋体'>＝</span><span lang=EN-US>FALSE</span><span
style='font-family:宋体'>）并且超时时，</span><span lang=EN-US>MSComm</span><span
style='font-family:宋体'>控件设置</span><span lang=EN-US>CommEvent</span><span
style='font-family:宋体'>属性为</span><span lang=EN-US>comEventCTSTO(Clear To Send
Timeout)</span><span style='font-family:宋体'>并产生</span><span lang=EN-US>OnComm</span><span
style='font-family:宋体'>事件。</span><span lang=EN-US>Clear To Send</span><span
style='font-family:宋体'>线用于</span><span lang=EN-US>RTS/CTS(Request To Send)</span><span
style='font-family:宋体'>硬件握手。如果需要确定</span><span lang=EN-US>Clear To Send</span><span
style='font-family:宋体'>线的状态，</span><span lang=EN-US>CTSHolding</span><span
style='font-family:宋体'>属性给出一种手工查询的方法。</span></p>
<p class=MsoNormal style='margin-left:57.0pt;text-indent:-36.0pt'><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>（</span><span lang=EN-US>5</span><span style='font-family:
宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>）</span><span
lang=EN-US style='font-size:7.0pt'> </span><span
lang=EN-US>SThreshold</span><span style='font-family:宋体'>属性</span></p>
<p class=MsoNormal style='margin-left:21.0pt'><span lang=EN-US
style='background:#D9D9D9'>void SetSThreshold(short nNewValue); short
GetSThreshold();</span></p>
<p class=MsoNormal style='text-indent:21.0pt'><span lang=EN-US>MSComm</span><span
style='font-family:宋体'>控件设置</span><span lang=EN-US>CommEvent</span><span
style='font-family:宋体'>属性为</span><span lang=EN-US>comEvSend</span><span
style='font-family:宋体'>并产生</span><span lang=EN-US>OnComm</span><span
style='font-family:宋体'>事件之前，设置并返回传输缓冲区中允许的最小字符数。这里</span><span lang=EN-US>nNewvalue</span><span
style='font-family:宋体'>是</span><span lang=EN-US>short</span><span
style='font-family:宋体'>型数据，代表在</span><span lang=EN-US>OnComm</span><span
style='font-family:宋体'>事件产生之前在传输缓冲区中的最小字符数。</span></p>
<p class=MsoNormal style='text-indent:21.0pt'><span style='font-family:宋体'>若设置</span><span
lang=EN-US>SThreshold</span><span style='font-family:宋体'>属性为</span><span
lang=EN-US>0</span><span style='font-family:宋体'>（默认值），数据传输事件不会产生</span><span
lang=EN-US>OnComm</span><span style='font-family:宋体'>事件。若设置</span><span
lang=EN-US>SThreshold</span><span style='font-family:宋体'>属性为</span><span
lang=EN-US>1</span><span style='font-family:宋体'>，当传输缓冲区完全空时，</span><span
lang=EN-US>MSComm</span><span style='font-family:宋体'>控件产生</span><span
lang=EN-US>OnComm</span><span style='font-family:宋体'>事件。如果在传输缓冲区的字符数小于</span><span
lang=EN-US>Value,CommEvent</span><span style='font-family:宋体'>属性设置为</span><span
lang=EN-US>comEvSend, </span><span style='font-family:宋体'>并产生</span><span
lang=EN-US>OnComm</span><span style='font-family:宋体'>事件。</span></p>
<p class=MsoNormal><span lang=EN-US>comEvSend</span><span style='font-family:
宋体'>事件仅当字符数与</span><span lang=EN-US>SThreshold</span><span style='font-family:
宋体'>交叉时被激活一次。例如，如果</span><span lang=EN-US>SThreshold</span><span
style='font-family:宋体'>等于</span><span lang=EN-US>5</span><span
style='font-family:宋体'>，仅当在输出队列中字符数从</span><span lang=EN-US>5</span><span
style='font-family:宋体'>降到</span><span lang=EN-US>4</span><span
style='font-family:宋体'>时，</span><span lang=EN-US>comEvSend</span><span
style='font-family:宋体'>才发生。如果在输出队列中从没有比</span><span lang=EN-US>SThreshold</span><span
style='font-family:宋体'>多的字符，</span><span lang=EN-US>comEvSend</span><span
style='font-family:宋体'>事件将绝不会发生。</span></p>
<p class=MsoNormal><span lang=EN-US> </span><span
style='font-family:宋体'>（</span><span lang=EN-US>6</span><span style='font-family:
宋体'>）</span><span lang=EN-US> InputMode</span><span style='font-family:宋体'>属性</span></p>
<p class=MsoNormal><span lang=EN-US> <span
style='background:#D9D9D9'>void SetInputMode(long nNewValue); long
GetInputMode();</span></span></p>
<p class=MsoNormal><span lang=EN-US> </span><span
style='font-family:宋体'>该属性用于设置或者返回传输数据的类型。其取值和基本含义如表</span><span lang=EN-US>4</span><span
style='font-family:宋体'>所示。</span></p>
<p class=MsoNormal><span style='font-family:宋体'>表</span><span lang=EN-US>4
InputMode</span><span style='font-family:宋体'>属性及含义</span><span lang=EN-US><o:p></o:p></span></p>
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<p class=MsoNormal><span lang=EN-US>
</span><span style='font-family:宋体'>设定值</span></p>
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<p class=MsoNormal><span lang=EN-US> </span><span
style='font-family:宋体'>值</span></p>
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<p class=MsoNormal><span lang=EN-US>
</span><span style='font-family:宋体'>描述</span></p>
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<p class=MsoNormal><span lang=EN-US>ComInputModeText(</span><span
style='font-family:宋体'>缺省</span><span lang=EN-US>)</span></p>
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<p class=MsoNormal><span lang=EN-US> 0</span></p>
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<p class=MsoNormal><span style='font-family:宋体'>通过</span><span lang=EN-US>Input</span><span
style='font-family:宋体'>属性以文本方式取回数据</span></p>
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<p class=MsoNormal><span lang=EN-US>comInputModeBinary</span></p>
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<p class=MsoNormal><span lang=EN-US> 1</span></p>
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<p class=MsoNormal><span style='font-family:宋体'>通过</span><span lang=EN-US>Input</span><span
style='font-family:宋体'>属性以二进制方式检取回数据</span></p>
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<p class=MsoNormal style='margin-left:21.0pt'><span style='font-family:宋体'>（</span><span
lang=EN-US>7</span><span style='font-family:宋体'>）</span><span lang=EN-US>
InPutLen</span><span style='font-family:宋体'>属性</span></p>
<p class=MsoNormal style='margin-left:21.0pt'><span lang=EN-US
style='background:#D9D9D9'>void SetInPutLen(short nNewValue);short
GetInPutLen();</span></p>
<p class=MsoNormal style='text-indent:21.0pt'><span style='font-family:宋体'>该属性用于设置并返回</span><span
lang=EN-US>Input</span><span style='font-family:宋体'>属性从接收缓冲区读取的字符数。</span><span
lang=EN-US>nNewvalue</span><span style='font-family:宋体'>是</span><span
lang=EN-US>short</span><span style='font-family:宋体'>型数值，说明</span><span
lang=EN-US>Input</span><span style='font-family:宋体'>属性从接收缓冲区读取的字符数。</span></p>
<p class=MsoNormal style='text-indent:21.0pt'><span lang=EN-US>InPutLen</span><span
style='font-family:宋体'>属性的默认值是</span><span lang=EN-US>0</span><span
style='font-family:宋体'>。当设置</span><span lang=EN-US>InPutLen</span><span
style='font-family:宋体'>为</span><span lang=EN-US>0</span><span style='font-family:
宋体'>时，使用</span><span lang=EN-US>Input</span><span style='font-family:宋体'>将</span><span
lang=EN-US>MSComm</span><span style='font-family:宋体'>控件读取接收缓冲区中全部的内容。若接收缓冲区中</span><span
lang=EN-US>InPutLen</span><span style='font-family:宋体'>字符无效，</span><span
lang=EN-US>Input</span><span style='font-family:宋体'>属性返回一个零长度字符串（〝〞）。在使用</span><span
lang=EN-US>Input</span><span style='font-family:宋体'>前，用户可以选择检查</span><span
lang=EN-US>InBufferCount</span><span style='font-family:宋体'>属性来确定缓冲区中是否已有需要数目的字符。该属性在从输出格式为定长数据的机器读取数据时非常有用。</span></p>
<p class=MsoNormal style='text-indent:21.0pt'><span style='font-family:宋体'>（</span><span
lang=EN-US>8</span><span style='font-family:宋体'>）</span><span lang=EN-US>
InBuffersize</span><span style='font-family:宋体'>属性</span></p>
<p class=MsoNormal style='text-indent:21.0pt'><span lang=EN-US
style='background:#D9D9D9'>void SetInBufferCount(short nNewValue);short
GetInBufferSize();</span></p>
<p class=MsoNormal style='text-indent:21.0pt'><span lang=EN-US>InBuffersize</span><span
style='font-family:宋体'>属性用于设置或返回输入缓冲区的大小，默认值为</span><span lang=EN-US>1024</span><span
style='font-family:宋体'>字节。</span></p>
<p class=MsoNormal style='text-indent:21.0pt'><span style='font-family:宋体'>（</span><span
lang=EN-US>9</span><span style='font-family:宋体'>）</span><span lang=EN-US>
InBufferCount</span><span style='font-family:宋体'>属性</span><span lang=EN-US>
</span></p>
<p class=MsoNormal style='text-indent:21.0pt'><span lang=EN-US
style='background:#D9D9D9'>void SetInBufferCount(short nNewValue); short
GetInBufferCount(); </span><span lang=EN-US> </span></p>
<p class=MsoNormal style='text-indent:15.75pt'><span lang=EN-US> InBufferCount</span><span
style='font-family:宋体'>属性用于返回输入缓冲区内的等待读取的字节个数，可以通过该属性值为</span><span lang=EN-US>0</span><span
style='font-family:宋体'>来清除接收缓冲区。</span></p>
<p class=MsoNormal style='text-indent:15.75pt'><span style='font-family:宋体'>（</span><span
lang=EN-US>10</span><span style='font-family:宋体'>）</span><span lang=EN-US>
Input</span><span style='font-family:宋体'>属性</span></p>
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