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            color=#000066><B>C#2.0中，SerialPort運行方式[轉(zhuǎn)載]</B></FONT> </TD>
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                              <DIV id=art 
                              style="MARGIN: 15px">[點評:這幾天一直用這個控件,可是老是有問題,也許這篇文章是解決問題最終的辦法了.]<BR>SerialPort中串口數(shù)據(jù)的讀取與寫入有較大的不同。由于串口不知道數(shù)據(jù)何時到達，因此有兩種方法可以實現(xiàn)串口數(shù)據(jù)的讀取。 

                              <P>&nbsp;&nbsp;&nbsp; 一、線程實時讀串口；</P>
                              <P>&nbsp;&nbsp;&nbsp; 二、事件觸發(fā)方式實現(xiàn)。 </P>
                              <P>&nbsp;&nbsp;&nbsp;&nbsp; 
                              由于線程實時讀串口的效率不是十分高效，因此比較好的方法是事件觸發(fā)的方式。在SerialPort類中有DataReceived事件，當串口的讀緩存有數(shù)據(jù)到達時則觸發(fā)DataReceived事件，其中SerialPort.ReceivedBytesThreshold屬性決定了當串口讀緩存中數(shù)據(jù)多少個時才觸發(fā)DataReceived事件，默認為1。 
                              </P>
                              <P>&nbsp;&nbsp;&nbsp; 
                              另外，SerialPort.DataReceived事件運行比較特殊，其運行在輔線程，不能與主線程中的顯示數(shù)據(jù)控件直接進行數(shù)據(jù)傳輸，必須用間接的方式實現(xiàn)。如下：</P><PRE style="BORDER-RIGHT: black 1px solid; PADDING-RIGHT: 4px; BORDER-TOP: black 1px solid; PADDING-LEFT: 4px; PADDING-BOTTOM: 4px; BORDER-LEFT: black 1px solid; PADDING-TOP: 4px; BORDER-BOTTOM: black 1px solid; BACKGROUND-COLOR: rgb(237,237,237)"><DIV><!--
Code highlighting produced by Actipro CodeHighlighter (freeware)
http://www.CodeHighlighter.com/
--><IMG alt="" src="" align=top><SPAN style="COLOR: rgb(0,0,0)">SerialPort spSend; </SPAN><SPAN style="COLOR: rgb(0,128,0)">//</SPAN><SPAN style="COLOR: rgb(0,128,0)">spSend,spReceive用虛擬串口連接，它們之間可以相互傳輸數(shù)據(jù)。spSend發(fā)送數(shù)據(jù) </SPAN><SPAN style="COLOR: rgb(0,128,0)">
<IMG alt="" src="" align=top></SPAN><SPAN style="COLOR: rgb(0,0,0)">SerialPort spReceive; </SPAN><SPAN style="COLOR: rgb(0,128,0)">//</SPAN><SPAN style="COLOR: rgb(0,128,0)">spReceive接受數(shù)據(jù) </SPAN><SPAN style="COLOR: rgb(0,128,0)">
<IMG alt="" src="" align=top></SPAN><SPAN style="COLOR: rgb(0,0,0)">TextBox txtSend; </SPAN><SPAN style="COLOR: rgb(0,128,0)">//</SPAN><SPAN style="COLOR: rgb(0,128,0)">發(fā)送區(qū) </SPAN><SPAN style="COLOR: rgb(0,128,0)">
<IMG alt="" src="" align=top></SPAN><SPAN style="COLOR: rgb(0,0,0)">TextBox txtReceive; </SPAN><SPAN style="COLOR: rgb(0,128,0)">//</SPAN><SPAN style="COLOR: rgb(0,128,0)">接受區(qū) </SPAN><SPAN style="COLOR: rgb(0,128,0)">
<IMG alt="" src="" align=top></SPAN><SPAN style="COLOR: rgb(0,0,0)">Button btnSend; </SPAN><SPAN style="COLOR: rgb(0,128,0)">//</SPAN><SPAN style="COLOR: rgb(0,128,0)">數(shù)據(jù)發(fā)送按鈕 </SPAN><SPAN style="COLOR: rgb(0,128,0)">
<IMG alt="" src="" align=top></SPAN><SPAN style="COLOR: rgb(0,0,255)">delegate</SPAN><SPAN style="COLOR: rgb(0,0,0)"> </SPAN><SPAN style="COLOR: rgb(0,0,255)">void</SPAN><SPAN style="COLOR: rgb(0,0,0)"> HandleInterfaceUpdateDelegate(</SPAN><SPAN style="COLOR: rgb(0,0,255)">string</SPAN><SPAN style="COLOR: rgb(0,0,0)"> text); </SPAN><SPAN style="COLOR: rgb(0,128,0)">//</SPAN><SPAN style="COLOR: rgb(0,128,0)">委托，此為重點 </SPAN><SPAN style="COLOR: rgb(0,128,0)">
<IMG alt="" src="" align=top></SPAN><SPAN style="COLOR: rgb(0,0,0)">HandleInterfaceUpdateDelegate interfaceUpdateHandle;<BR><IMG alt="" src="" align=top><BR><IMG alt="" src="" align=top></SPAN><SPAN style="COLOR: rgb(0,0,255)">public</SPAN><SPAN style="COLOR: rgb(0,0,0)"> </SPAN><SPAN style="COLOR: rgb(0,0,255)">void</SPAN><SPAN style="COLOR: rgb(0,0,0)"> InitClient() </SPAN><SPAN style="COLOR: rgb(0,128,0)">//</SPAN><SPAN style="COLOR: rgb(0,128,0)">窗體控件已在初始化 </SPAN><SPAN style="COLOR: rgb(0,128,0)">
<IMG id=Codehighlighter_348_629_Open_Image onclick="this.style.display='none'; Codehighlighter_348_629_Open_Text.style.display='none'; Codehighlighter_348_629_Closed_Image.style.display='inline'; Codehighlighter_348_629_Closed_Text.style.display='inline';" alt="" src="" align=top><IMG id=Codehighlighter_348_629_Closed_Image style="DISPLAY: none" onclick="this.style.display='none'; Codehighlighter_348_629_Closed_Text.style.display='none'; Codehighlighter_348_629_Open_Image.style.display='inline'; Codehighlighter_348_629_Open_Text.style.display='inline';" alt="" src="" align=top></SPAN><SPAN id=Codehighlighter_348_629_Closed_Text style="BORDER-RIGHT: rgb(128,128,128) 1px solid; BORDER-TOP: rgb(128,128,128) 1px solid; DISPLAY: none; BORDER-LEFT: rgb(128,128,128) 1px solid; BORDER-BOTTOM: rgb(128,128,128) 1px solid; BACKGROUND-COLOR: rgb(255,255,255)">...</SPAN><SPAN id=Codehighlighter_348_629_Open_Text><SPAN style="COLOR: rgb(0,0,0)">{<BR><IMG alt="" src="" align=top>interfaceUpdateHandle </SPAN><SPAN style="COLOR: rgb(0,0,0)">=</SPAN><SPAN style="COLOR: rgb(0,0,0)"> </SPAN><SPAN style="COLOR: rgb(0,0,255)">new</SPAN><SPAN style="COLOR: rgb(0,0,0)"> HandleInterfaceUpdateDelegate(UpdateTextBox); </SPAN><SPAN style="COLOR: rgb(0,128,0)">//</SPAN><SPAN style="COLOR: rgb(0,128,0)">實例化委托對象 </SPAN><SPAN style="COLOR: rgb(0,128,0)">
<IMG alt="" src="" align=top></SPAN><SPAN style="COLOR: rgb(0,0,0)">spSend.Open(); </SPAN><SPAN style="COLOR: rgb(0,128,0)">//</SPAN><SPAN style="COLOR: rgb(0,128,0)">SerialPort對象在程序結(jié)束前必須關閉，在此說明 </SPAN><SPAN style="COLOR: rgb(0,128,0)">
<IMG alt="" src="" align=top></SPAN><SPAN style="COLOR: rgb(0,0,0)">spReceive.DataReceived </SPAN><SPAN style="COLOR: rgb(0,0,0)">+=</SPAN><SPAN style="COLOR: rgb(0,0,0)"> Ports.SerialDataReceivedEventHandler(spReceive_DataReceived);<BR><IMG alt="" src="" align=top>spReceive.ReceivedBytesThreshold </SPAN><SPAN style="COLOR: rgb(0,0,0)">=</SPAN><SPAN style="COLOR: rgb(0,0,0)"> </SPAN><SPAN style="COLOR: rgb(0,0,0)">1</SPAN><SPAN style="COLOR: rgb(0,0,0)">;<BR><IMG alt="" src="" align=top>spReceive.Open();<BR><IMG alt="" src="" align=top>}</SPAN></SPAN><SPAN style="COLOR: rgb(0,0,0)">
<IMG alt="" src="" align=top><BR><IMG alt="" src="" align=top></SPAN><SPAN style="COLOR: rgb(0,0,255)">public</SPAN><SPAN style="COLOR: rgb(0,0,0)"> </SPAN><SPAN style="COLOR: rgb(0,0,255)">void</SPAN><SPAN style="COLOR: rgb(0,0,0)"> btnSend_Click(</SPAN><SPAN style="COLOR: rgb(0,0,255)">object</SPAN><SPAN style="COLOR: rgb(0,0,0)"> sender,EventArgs e)<BR><IMG id=Codehighlighter_687_723_Open_Image onclick="this.style.display='none'; Codehighlighter_687_723_Open_Text.style.display='none'; Codehighlighter_687_723_Closed_Image.style.display='inline'; Codehighlighter_687_723_Closed_Text.style.display='inline';" alt="" src="" align=top><IMG id=Codehighlighter_687_723_Closed_Image style="DISPLAY: none" onclick="this.style.display='none'; Codehighlighter_687_723_Closed_Text.style.display='none'; Codehighlighter_687_723_Open_Image.style.display='inline'; Codehighlighter_687_723_Open_Text.style.display='inline';" alt="" src="" align=top></SPAN><SPAN id=Codehighlighter_687_723_Closed_Text style="BORDER-RIGHT: rgb(128,128,128) 1px solid; BORDER-TOP: rgb(128,128,128) 1px solid; DISPLAY: none; BORDER-LEFT: rgb(128,128,128) 1px solid; BORDER-BOTTOM: rgb(128,128,128) 1px solid; BACKGROUND-COLOR: rgb(255,255,255)">...</SPAN><SPAN id=Codehighlighter_687_723_Open_Text><SPAN style="COLOR: rgb(0,0,0)">{<BR><IMG alt="" src="" align=top>spSend.WriteLine(txtSend.Text);<BR><IMG alt="" src="" align=top>}</SPAN></SPAN><SPAN style="COLOR: rgb(0,0,0)">
<IMG alt="" src="" align=top><BR><IMG alt="" src="" align=top></SPAN><SPAN style="COLOR: rgb(0,0,255)">public</SPAN><SPAN style="COLOR: rgb(0,0,0)"> </SPAN><SPAN style="COLOR: rgb(0,0,255)">void</SPAN><SPAN style="COLOR: rgb(0,0,0)"> spReceive_DataReceived(</SPAN><SPAN style="COLOR: rgb(0,0,255)">object</SPAN><SPAN style="COLOR: rgb(0,0,0)"> sender,Ports.SerialDataReceivedEventArgs e)<BR><IMG id=Codehighlighter_814_1019_Open_Image onclick="this.style.display='none'; Codehighlighter_814_1019_Open_Text.style.display='none'; Codehighlighter_814_1019_Closed_Image.style.display='inline'; Codehighlighter_814_1019_Closed_Text.style.display='inline';" alt="" src="" align=top><IMG id=Codehighlighter_814_1019_Closed_Image style="DISPLAY: none" onclick="this.style.display='none'; Codehighlighter_814_1019_Closed_Text.style.display='none'; Codehighlighter_814_1019_Open_Image.style.display='inline'; Codehighlighter_814_1019_Open_Text.style.display='inline';" alt="" src="" align=top></SPAN><SPAN id=Codehighlighter_814_1019_Closed_Text style="BORDER-RIGHT: rgb(128,128,128) 1px solid; BORDER-TOP: rgb(128,128,128) 1px solid; DISPLAY: none; BORDER-LEFT: rgb(128,128,128) 1px solid; BORDER-BOTTOM: rgb(128,128,128) 1px solid; BACKGROUND-COLOR: rgb(255,255,255)">...</SPAN><SPAN id=Codehighlighter_814_1019_Open_Text><SPAN style="COLOR: rgb(0,0,0)">{<BR><IMG alt="" src="" align=top></SPAN><SPAN style="COLOR: rgb(0,0,255)">byte</SPAN><SPAN style="COLOR: rgb(0,0,0)">[] readBuffer </SPAN><SPAN style="COLOR: rgb(0,0,0)">=</SPAN><SPAN style="COLOR: rgb(0,0,0)"> </SPAN><SPAN style="COLOR: rgb(0,0,255)">new</SPAN><SPAN style="COLOR: rgb(0,0,0)"> </SPAN><SPAN style="COLOR: rgb(0,0,255)">byte</SPAN><SPAN style="COLOR: rgb(0,0,0)">[spReceive.ReadBufferSize];<BR><IMG alt="" src="" align=top>spReceive.Read(readBuffer, </SPAN><SPAN style="COLOR: rgb(0,0,0)">0</SPAN><SPAN style="COLOR: rgb(0,0,0)">, readBuffer.Length);<BR><IMG id=Codehighlighter_973_1014_Open_Image onclick="this.style.display='none'; Codehighlighter_973_1014_Open_Text.style.display='none'; Codehighlighter_973_1014_Closed_Image.style.display='inline'; Codehighlighter_973_1014_Closed_Text.style.display='inline';" alt="" src="" align=top><IMG id=Codehighlighter_973_1014_Closed_Image style="DISPLAY: none" onclick="this.style.display='none'; Codehighlighter_973_1014_Closed_Text.style.display='none'; Codehighlighter_973_1014_Open_Image.style.display='inline'; Codehighlighter_973_1014_Open_Text.style.display='inline';" alt="" src="" align=top></SPAN><SPAN style="COLOR: rgb(0,0,255)">this</SPAN><SPAN style="COLOR: rgb(0,0,0)">.Invoke(interfaceUpdateHandle, </SPAN><SPAN style="COLOR: rgb(0,0,255)">new</SPAN><SPAN style="COLOR: rgb(0,0,0)"> </SPAN><SPAN style="COLOR: rgb(0,0,255)">string</SPAN><SPAN style="COLOR: rgb(0,0,0)">[] </SPAN><SPAN id=Codehighlighter_973_1014_Closed_Text style="BORDER-RIGHT: rgb(128,128,128) 1px solid; BORDER-TOP: rgb(128,128,128) 1px solid; DISPLAY: none; BORDER-LEFT: rgb(128,128,128) 1px solid; BORDER-BOTTOM: rgb(128,128,128) 1px solid; BACKGROUND-COLOR: rgb(255,255,255)">...</SPAN><SPAN id=Codehighlighter_973_1014_Open_Text><SPAN style="COLOR: rgb(0,0,0)">{ Encoding.Unicode.GetString(readBuffer) }</SPAN></SPAN><SPAN style="COLOR: rgb(0,0,0)">);<BR><IMG alt="" src="" align=top>}</SPAN></SPAN><SPAN style="COLOR: rgb(0,0,0)">
<IMG alt="" src="" align=top><BR><IMG alt="" src="" align=top></SPAN><SPAN style="COLOR: rgb(0,0,255)">private</SPAN><SPAN style="COLOR: rgb(0,0,0)"> </SPAN><SPAN style="COLOR: rgb(0,0,255)">void</SPAN><SPAN style="COLOR: rgb(0,0,0)"> UpdateTextBox(</SPAN><SPAN style="COLOR: rgb(0,0,255)">string</SPAN><SPAN style="COLOR: rgb(0,0,0)"> text)<BR><IMG id=Codehighlighter_1064_1092_Open_Image onclick="this.style.display='none'; Codehighlighter_1064_1092_Open_Text.style.display='none'; Codehighlighter_1064_1092_Closed_Image.style.display='inline'; Codehighlighter_1064_1092_Closed_Text.style.display='inline';" alt="" src="" align=top><IMG id=Codehighlighter_1064_1092_Closed_Image style="DISPLAY: none" onclick="this.style.display='none'; Codehighlighter_1064_1092_Closed_Text.style.display='none'; Codehighlighter_1064_1092_Open_Image.style.display='inline'; Codehighlighter_1064_1092_Open_Text.style.display='inline';" alt="" src="" align=top></SPAN><SPAN id=Codehighlighter_1064_1092_Closed_Text style="BORDER-RIGHT: rgb(128,128,128) 1px solid; BORDER-TOP: rgb(128,128,128) 1px solid; DISPLAY: none; BORDER-LEFT: rgb(128,128,128) 1px solid; BORDER-BOTTOM: rgb(128,128,128) 1px solid; BACKGROUND-COLOR: rgb(255,255,255)">...</SPAN><SPAN id=Codehighlighter_1064_1092_Open_Text><SPAN style="COLOR: rgb(0,0,0)">{<BR><IMG alt="" src="" align=top>txtReceive.Text </SPAN><SPAN style="COLOR: rgb(0,0,0)">=</SPAN><SPAN style="COLOR: rgb(0,0,0)"> text;<BR><IMG alt="" src="" align=top>}</SPAN></SPAN><SPAN style="COLOR: rgb(0,0,0)"> </SPAN></DIV></PRE></DIV></TD></TR></TBODY></TABLE>
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