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📄 在delphi中用spcomm实现串口编程.htm

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style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">按钮。</SPAN><SPAN 
lang=EN-US> </SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US><SPAN 
style="mso-spacerun: yes"></SPAN></SPAN>&nbsp;</P>
<P class=MsoNormal><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'">．安装后，在</SPAN><SPAN 
lang=EN-US> System</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">控件面板中将出现一个红色控件</SPAN><SPAN 
lang=EN-US> COM</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">。现在就可以像</SPAN><SPAN 
lang=EN-US> Delphi</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">自带控件一样使用</SPAN><SPAN 
lang=EN-US> COM</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">控件了。</SPAN><SPAN 
lang=EN-US> </SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US><SPAN 
style="mso-spacerun: yes"></SPAN></SPAN>&nbsp;</P>
<P class=MsoNormal><SPAN lang=EN-US>SPCOMM</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的属性、方法和事件</SPAN><SPAN 
lang=EN-US> </SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US><SPAN 
style="mso-spacerun: yes"></SPAN></SPAN>&nbsp;</P>
<P class=MsoNormal><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'">属性</SPAN><SPAN 
lang=EN-US> </SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US><SPAN 
style="mso-spacerun: yes"></SPAN></SPAN>&nbsp;</P>
<P class=MsoNormal><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>CommName</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">：表示</SPAN><SPAN 
lang=EN-US> COM1</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> COM2</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">等串口的名字；</SPAN><SPAN 
lang=EN-US> </SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US><SPAN 
style="mso-spacerun: yes"></SPAN></SPAN>&nbsp;</P>
<P class=MsoNormal><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>BaudRate:</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">根据实际需要设定的波特率，在串口打开后也可更改此值，实际波特率随之更改；</SPAN><SPAN 
lang=EN-US> </SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US><SPAN 
style="mso-spacerun: yes"></SPAN></SPAN>&nbsp;</P>
<P class=MsoNormal><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>ParityCheck</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">：表示是否需要奇偶校验；</SPAN><SPAN 
lang=EN-US> </SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US><SPAN 
style="mso-spacerun: yes"></SPAN></SPAN>&nbsp;</P>
<P class=MsoNormal><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>ByteSize</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">：根据实际情况设定的字节长度；</SPAN><SPAN 
lang=EN-US> </SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US><SPAN 
style="mso-spacerun: yes"></SPAN></SPAN>&nbsp;</P>
<P class=MsoNormal><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>Parity</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">：奇偶校验位；</SPAN><SPAN 
lang=EN-US> </SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US><SPAN 
style="mso-spacerun: yes"></SPAN></SPAN>&nbsp;</P>
<P class=MsoNormal><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>StopBits</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">：停止位；</SPAN><SPAN 
lang=EN-US> </SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US><SPAN 
style="mso-spacerun: yes"></SPAN></SPAN>&nbsp;</P>
<P class=MsoNormal><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>SendDataEmpty</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">：这是一个布尔型属性，为</SPAN><SPAN 
lang=EN-US> true</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">时表示发送缓存为空，或者发送队列里没有信息；为</SPAN><SPAN 
lang=EN-US> false</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">时表示发送缓存不为空，或者发送队列里有信息。</SPAN><SPAN 
lang=EN-US> </SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US><SPAN 
style="mso-spacerun: yes"></SPAN></SPAN>&nbsp;</P>
<P class=MsoNormal><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'">．方法</SPAN><SPAN 
lang=EN-US> </SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US><SPAN 
style="mso-spacerun: yes"></SPAN></SPAN>&nbsp;</P>
<P class=MsoNormal><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>Startcomm</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">方法用于打开串口，当打开失败时通常会报错。错误主要有</SPAN><SPAN 
lang=EN-US> 7</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">种：⑴串口已经打开；⑵打开串口错误；⑶文件句柄不是通信句柄；⑷不能够安装通信缓存；⑸不能产生事件；⑹不能产生读进程；⑺不能产生写进程；</SPAN><SPAN 
lang=EN-US> </SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US><SPAN 
style="mso-spacerun: yes"></SPAN></SPAN>&nbsp;</P>
<P class=MsoNormal><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>StopComm</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">方法用于关闭串口，没有返回值；</SPAN><SPAN 
lang=EN-US> </SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US><SPAN 
style="mso-spacerun: yes"></SPAN></SPAN>&nbsp;</P>
<P class=MsoNormal><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>WriteCommData(pDataToWrite: PChar;dwSizeofDataToWrite:Word 
)</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">方法是个带有布尔型返回值的函数，用于将一个字符串发送到写进程，发送成功返回</SPAN><SPAN 
lang=EN-US> true</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，发送失败返回</SPAN><SPAN 
lang=EN-US> false</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">。执行此函数将立即得到返回值，发送操作随后执行。该函数有两个参数，其中</SPAN><SPAN 
lang=EN-US> pDataToWrite</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">是要发送的字符串，</SPAN><SPAN 
lang=EN-US> dwSizeofDataToWrite</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">是发送字符串的长度。</SPAN><SPAN 
lang=EN-US> </SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US><SPAN 
style="mso-spacerun: yes"></SPAN></SPAN>&nbsp;</P>
<P class=MsoNormal><SPAN lang=EN-US>3</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．事件</SPAN><SPAN 
lang=EN-US> </SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US><SPAN 
style="mso-spacerun: yes"></SPAN></SPAN>&nbsp;</P>
<P class=MsoNormal><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>OnReceiveData :procedure (Sender: TObject;Buffer: 
Pointer;BufferLength: Word) of object </SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US><SPAN 
style="mso-spacerun: yes"></SPAN></SPAN>&nbsp;</P>
<P class=MsoNormal><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">当有数据输入缓存时将触发该事件，在这里可以对从串口收到的数据进行处理。</SPAN><SPAN 
lang=EN-US> Buffer</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">中是收到的数据，</SPAN><SPAN 
lang=EN-US> BufferLength</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">是收到的数据长度。</SPAN><SPAN 
lang=EN-US> </SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US><SPAN 
style="mso-spacerun: yes"></SPAN></SPAN>&nbsp;</P>
<P class=MsoNormal><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>OnReceiveError : procedure(Sender: TObject; EventMask : DWORD) 
</SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US><SPAN 
style="mso-spacerun: yes"></SPAN></SPAN>&nbsp;</P>
<P class=MsoNormal><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">当接收数据出现错误时将触发该事件。</SPAN><SPAN 
lang=EN-US> </SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US><SPAN 
style="mso-spacerun: yes"></SPAN></SPAN>&nbsp;</P>
<P class=MsoNormal><SPAN lang=EN-US>SPCOMM</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的使用</SPAN><SPAN 
lang=EN-US> </SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US><SPAN 
style="mso-spacerun: yes"></SPAN></SPAN>&nbsp;</P>
<P class=MsoNormal><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">下面是一个利用</SPAN><SPAN 
lang=EN-US> SPCOMM</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">控件的串口通信的例子。</SPAN><SPAN 
lang=EN-US> </SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US><SPAN 
style="mso-spacerun: yes"></SPAN></SPAN>&nbsp;</P>
<P class=MsoNormal><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">以实现</SPAN><SPAN 
lang=EN-US> PC</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">机与单片机</SPAN><SPAN 
lang=EN-US> 8051</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">之间的通信为例，首先要调通它们之间的握手信号。假定它们之间的通信协议是：</SPAN><SPAN 
lang=EN-US> PC</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">到</SPAN><SPAN 
lang=EN-US> 8051</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">一帧数据</SPAN><SPAN 
lang=EN-US> 6</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">个字节，</SPAN><SPAN 
lang=EN-US> 8051</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">到</SPAN><SPAN 
lang=EN-US> PC</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">一帧数据也为</SPAN><SPAN
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