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<p class=MsoNormal><b><span lang=EN-US style='color:blue'>MSComm</span></b><b><span
style='font-family:宋体;color:blue'>控件参考</span></b></p>
<p style='text-indent:21.0pt'><span lang=EN-US style='mso-bidi-font-family:
宋体'>MSComm是Microsoft Communications Control的简称，它是Microsoft公司提供的简化Windows下串口编程的ActiveX控件，它为应用程序提供了通过串行接口收发数据的简便方法。<o:p></o:p></span></p>
<p class=MsoNormal><b><span style='font-family:宋体'>（一）</span><span lang=EN-US>MSComm</span></b><b><span
style='font-family:宋体'>控件的属性</span></b></p>
<p class=MsoNormal style='text-indent:21.0pt'><span lang=EN-US>MSComm</span><span
style='font-family:宋体'>控件有很多重要的属性，但首先必须熟悉几个属性：</span><span lang=EN-US>CommPort</span><span
style='font-family:宋体'>—设置并返回通信端口号；</span><span lang=EN-US>Settings</span><span
style='font-family:宋体'>—以字符串的形式设置并返回数据传输速率、奇偶校验、数据比特、停止比特；</span><span
lang=EN-US>PortOpen</span><span style='font-family:宋体'>—设置并返回通信端口的状态，也可以打开和关闭端口；</span><span
lang=EN-US>Input</span><span style='font-family:宋体'>—从接收缓冲区返回和删除字符；</span><span
lang=EN-US>Output</span><span style='font-family:宋体'>—向传输缓冲区写一个字符串。</span></p>
<p class=MsoNormal style='text-indent:21.0pt'><span style='font-family:宋体'>下面分别描述</span><span
lang=EN-US>MSComm</span><span style='font-family:宋体'>控件的属性。</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>1</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>CommPort</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 SetCommPort(short nNew Value);short
GetCommPort();</span></p>
<p class=MsoNormal style='text-indent:21.0pt'><span style='font-family:宋体'>这一属性用于设置并返回连接的串行端口号，</span><span
lang=EN-US>Windows</span><span style='font-family:宋体'>将会利用该串口和外界通信。在设计时，</span><span
lang=EN-US>nNewValue </span><span style='font-family:宋体'>可以设置成从</span><span
lang=EN-US>1</span><span style='font-family:宋体'>～</span><span lang=EN-US>16</span><span
style='font-family:宋体'>的任何数（默认值为</span><span lang=EN-US>1</span><span
style='font-family:宋体'>）。但是如果用</span><span lang=EN-US>PortOpen</span><span
style='font-family:宋体'>属性打开一个并不存在的端口时，</span><span lang=EN-US>MSComm</span><span
style='font-family:宋体'>控件会产生错误</span><span lang=EN-US>68</span><span
style='font-family:宋体'>（设备无效）。</span></p>
<p class=MsoNormal style='margin-left:21.0pt'><span style='font-size:9.0pt;
font-family:宋体;background:#D9D9D9'>注意：必须在打开端口之前设置</span><span lang=EN-US
style='font-size:9.0pt;background:#D9D9D9'>CommPort</span><span
style='font-size:9.0pt;font-family:宋体;background:#D9D9D9'>属性。</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>2</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>Settings</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 Settings(LPCSTR IpszNewValue); String
GetSettings();</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数据传输速率、奇偶校验、数据比特、停止比特参数。当端口打开时，如果</span><span
lang=EN-US>value</span><span style='font-family:宋体'>非法，则</span><span
lang=EN-US>MSComm</span><span style='font-family:宋体'>控件产生错误</span><span
lang=EN-US>380</span><span style='font-family:宋体'>（非法属性值）。其中</span><span
lang=EN-US>IpszNewValue</span><span style='font-family:宋体'>用字符串表示，由四个设置值组成，有如下的组成格式：</span></p>
<p class=MsoNormal><span lang=EN-US> </span><span
style='font-family:宋体'>“</span><span lang=EN-US>BBBB,P,D,S</span><span
style='font-family:宋体'>”</span></p>
<p class=MsoNormal><span lang=EN-US> </span><span
style='font-family:宋体'>这里</span><span lang=EN-US>BBBB</span><span
style='font-family:宋体'>为数据传输速率，</span><span lang=EN-US>P</span><span
style='font-family:宋体'>为奇偶校验，</span><span lang=EN-US>D</span><span
style='font-family:宋体'>为数据比特数，</span><span lang=EN-US>S</span><span
style='font-family:宋体'>为停止比特数。</span><span lang=EN-US>value</span><span
style='font-family:宋体'>的默认值是：“</span><span lang=EN-US>9600,N,8,1</span><span
style='font-family:宋体'>”，表示传输速率为</span><span lang=EN-US>9600bit/s</span><span
style='font-family:宋体'>，无奇偶校验，</span><span lang=EN-US>8bit</span><span
style='font-family:宋体'>数据比特，</span><span lang=EN-US>1bit</span><span
style='font-family:宋体'>停止比特。数据传输速率的合法值可以是：</span><span lang=EN-US>110</span><span
style='font-family:宋体'>、</span><span lang=EN-US>300</span><span
style='font-family:宋体'>、</span><span lang=EN-US>600</span><span
style='font-family:宋体'>、</span><span lang=EN-US>1200</span><span
style='font-family:宋体'>、</span><span lang=EN-US>2400</span><span
style='font-family:宋体'>、</span><span lang=EN-US>4800</span><span
style='font-family:宋体'>、</span><span lang=EN-US>9600</span><span
style='font-family:宋体'>、</span><span lang=EN-US>14 400</span><span
style='font-family:宋体'>、</span><span lang=EN-US>19 200</span><span
style='font-family:宋体'>、</span><span lang=EN-US>28 800</span><span
style='font-family:宋体'>、</span><span lang=EN-US>38 400</span><span
style='font-family:宋体'>、</span><span lang=EN-US>56 000</span><span
style='font-family:宋体'>、</span><span lang=EN-US>57 600</span><span
style='font-family:宋体'>、</span><span lang=EN-US>115 200</span><span
style='font-family:宋体'>、</span><span lang=EN-US>12 800</span><span
style='font-family:宋体'>、</span><span lang=EN-US>25 600</span><span
style='font-family:宋体'>。</span></p>
<p class=MsoNormal><span lang=EN-US> </span><span
style='font-family:宋体'>奇偶校验值可以设置为表</span><span lang=EN-US>1</span><span
style='font-family:宋体'>的任一值。</span></p>
<p class=MsoNormal><span style='font-family:宋体'>表</span><span lang=EN-US>1
</span><span style='font-family:宋体'>奇偶校验设定值</span><span lang=EN-US><o:p></o:p></span></p>
<table border=0 cellspacing=0 cellpadding=0 style='border-collapse:collapse;
mso-padding-alt:0cm 0cm 0cm 0cm'>
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<td width=284 valign=top style='width:213.05pt;border:solid windowtext 1.0pt;
border-left:none;padding:0cm 5.4pt 0cm 5.4pt'>
<p class=MsoNormal><span lang=EN-US>
</span><span style='font-family:宋体'>设定值</span></p>
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<td width=284 valign=top style='width:213.05pt;border-top:solid windowtext 1.0pt;
border-left:none;border-bottom:solid windowtext 1.0pt;border-right:none;
padding:0cm 5.4pt 0cm 5.4pt'>
<p class=MsoNormal><span lang=EN-US>
</span><span style='font-family:宋体'>描述</span></p>
</td>
</tr>
<tr style='mso-yfti-irow:1'>
<td width=284 valign=top style='width:213.05pt;border-top:none;border-left:
none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;
padding:0cm 5.4pt 0cm 5.4pt'>
<p class=MsoNormal><span lang=EN-US>E</span></p>
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<td width=284 valign=top style='width:213.05pt;border:none;border-bottom:
solid windowtext 1.0pt;padding:0cm 5.4pt 0cm 5.4pt'>
<p class=MsoNormal><span style='font-family:宋体'>偶校验</span><span lang=EN-US>(EVENT)</span></p>
</td>
</tr>
<tr style='mso-yfti-irow:2'>
<td width=284 valign=top style='width:213.05pt;border-top:none;border-left:
none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;
padding:0cm 5.4pt 0cm 5.4pt'>
<p class=MsoNormal><span lang=EN-US>M</span></p>
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