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POFind the serial port settings in Delphi
 

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  1. POFind the serial port settings in Delphi
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    <p>Hi I have the need to find the Baud rate and other settings for a serial port, Looking about on the web, it looks like I should be using <a href="http://msdn.microsoft.com/en-us/library/aa363256%28VS.85%29.aspx" rel="nofollow noreferrer">GetCommConfig</a>, This returns a TCommConfig record with what I assume is the data I need. The problem is the function I wote returns the wrong values.</p> <p>The code below looks like it is working, but the baud rate is always 1200, which looking in windows device manager (and altering port settings), is wrong.</p> <p>I have tried calling it like so:</p> <pre><code>ComPort('com1'); ComPort('COM1'); ComPort('COM1:'); ComPort('COM4'); ComPort('COM9'); </code></pre> <p>the first 4 are valid but return 1200 and the 5th is invalid and returns 0</p> <pre><code>function ComPort(l_port:String):TCommConfig; {Gets the comm port settings} var ComFile: THandle; PortName: array[0..80] of Char; size: cardinal; CommConfig:TCommConfig; begin FillChar(Result, SizeOf(TCommConfig), 0);//blank return value try StrPCopy(PortName,l_port); ComFile := CreateFile(PortName,GENERIC_READ or GENERIC_WRITE,0,nil,OPEN_EXISTING,0{ FILE_ATTRIBUTE_NORMAL},0); try if (ComFile &lt;&gt; INVALID_HANDLE_VALUE) then begin FillChar(CommConfig, SizeOf(TCommConfig), 0);//blank record CommConfig.dwSize := sizeof(TCommConfig);//set size //CommConfig.dcb.DCBlength := SizeOf(_dcb); size := sizeof(TCommConfig); if (GetCommConfig(ComFile,CommConfig,size)) then begin Result := CommConfig; end; end; finally CloseHandle(ComFile); end; except Showmessage('Unable to open port ' + l_port); end; end; </code></pre> <p>Stepping through the code, the first 4 always hit the line <strong>Result := CommConfig;</strong>, so the GetCommConfig is retuning a valid code, so I must be missing something.</p> <p>I have tryed verious other things, such as setting the length of the dcb record, but all have the same result, as baud of 1200.</p> <p>Does anyone know where I am going wrong?</p>
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    1. COHave you tried GetCommState? http://msdn.microsoft.com/en-us/library/aa363260%28VS.85%29.aspx
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    2. COYes same result, as far as i can tell, GetCommConfig uses GetCommState internally to populate the DCB record.
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