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< RE class=prog_in_0>一‘读DXF文件</PRE>< RE class=prog_in_0>' ReadDXF extracts specified code/value pairs from a DXF file.</PRE>< RE class=prog_in_0>' This function requires four string parameters, a valid DXF</PRE>< RE class=prog_in_0>' file name, a DXF section name, the name of an object in that</PRE>< RE class=prog_in_0>' section, and a comma delimited list of codes.</PRE>< RE class=prog_in_0>'</PRE>< RE class=prog_in_0>Function ReadDXF( _</PRE>< RE class=prog_in_0> ByVal dxfFile As String, ByVal strSection As String, _</PRE>< RE class=prog_in_0> ByVal strObject As String, ByVal strCodeList As String)</PRE>< RE class=prog_in_0> Dim tmpCode, lastObj As String</PRE>< RE class=prog_in_0> Open dxfFile For Input As #1</PRE>< RE class=prog_in_0> ' Get the first code/value pair</PRE>< RE class=prog_in_0> codes = ReadCodes</PRE>< RE class=prog_in_0> ' Loop through the whole file until the "EOF" line</PRE>< RE class=prog_in_0> While codes(1) <> "EOF"</PRE>< RE class=prog_in_0> ' If the group code is '0' and the value is 'SECTION' ..</PRE>< RE class=prog_in_0> If codes(0) = "0" And codes(1) = "SECTION" Then</PRE>< RE class=prog_in_0> ' This must be a new section, so get the next</PRE>< RE class=prog_in_0> ' code/value pair.</PRE>< RE class=prog_in_0> codes = ReadCodes()</PRE>< RE class=prog_in_0> ' If this section is the right one ..</PRE>< RE class=prog_in_0> If codes(1) = strSection Then</PRE>< RE class=prog_in_0> ' Get the next code/value pair and ..</PRE>< RE class=prog_in_0> codes = ReadCodes</PRE>< RE class=prog_in_0> ' Loop through this section until the 'ENDSEC'</PRE>< RE class=prog_in_0> While codes(1) <> "ENDSEC"</PRE>< RE class=prog_in_0> ' While in a section, all '0' codes indicate</PRE>< RE class=prog_in_0> ' an object. If you find a '0' store the</PRE>< RE class=prog_in_0> ' object name for future use.</PRE>< RE class=prog_in_0> If codes(0) = "0" Then lastObj = codes(1)</PRE>< RE class=prog_in_0> ' If this object is one you're interested in</PRE>< RE class=prog_in_0> If lastObj = strObject Then</PRE>< RE class=prog_in_0> ' Surround the code with commas</PRE>< RE class=prog_in_0> tmpCode = "," & codes(0) & ","</PRE>< RE class=prog_in_0> ' If this code is in the list of codes ..</PRE>< RE class=prog_in_0> If InStr(strCodeList, tmpCode) Then</PRE>< RE class=prog_in_0> ' Append the return value.</PRE>< RE class=prog_in_0> ReadDXF = ReadDXF & _</PRE>< RE class=prog_in_0> codes(0) & "=" & codes(1) & vbCrLf</PRE>< RE class=prog_in_0> End If</PRE>< RE class=prog_in_0> End If</PRE>< RE class=prog_in_0> ' Read another code/value pair</PRE>< RE class=prog_in_0> codes = ReadCodes</PRE>< RE class=prog_in_0> Wend</PRE>< RE class=prog_in_0> End If</PRE>< RE class=prog_in_0> Else</PRE>< RE class=prog_in_0> codes = ReadCodes</PRE>< RE class=prog_in_0> End If</PRE>< RE class=prog_in_0> Wend</PRE>< RE class=prog_in_0> Close #1</PRE>< RE class=prog_in_0>End Function</PRE>< RE class=prog_in_0></PRE>< RE class=prog_in_0>' ReadCodes reads two lines from an open file and returns a two item</PRE>< RE class=prog_in_0>' array, a group code and its value. As long as a DXF file is read </PRE>< RE class=prog_in_0>' two lines at a time, all should be fine. However, to make your </PRE>< RE class=prog_in_0>' code more reliable, you should add some additional error and</PRE>< RE class=prog_in_0>' other checking.</PRE>< RE class=prog_in_0>'</PRE>< RE class=prog_in_0>Function ReadCodes() As Variant</PRE>< RE class=prog_in_0> Dim codeStr, valStr As String</PRE>< RE class=prog_in_0> Line Input #1, codeStr</PRE>< RE class=prog_in_0> Line Input #1, valStr</PRE>< RE class=prog_in_0> ' Trim the leading and trailing space from the code</PRE>< RE class=prog_in_0> ReadCodes = Array(Trim(codeStr), valStr)</PRE>< RE class=prog_in_end_0>End Function</PRE>< RE class=prog_in_end_0> </PRE>< RE class=prog_in_end_0>二、写DXF文件</PRE>< RE class=prog_in_end_0>< RE class=prog_in_0>' WriteDXFPolygon creates a minimal DXF file that only contains</PRE>< RE class=prog_in_0>' the ENTITIES section. This subroutine requires five parameters,</PRE>< RE class=prog_in_0>' the DXF file name, the number of sides for the polygon, the X</PRE>< RE class=prog_in_0>' and Y coordinates for the bottom end of the right-most side</PRE>< RE class=prog_in_0>' (it starts in a vertical direction), and the length for each</PRE>< RE class=prog_in_0>' side. Note that because this only requests 2D points, it does</PRE>< RE class=prog_in_0>' not include the Z coordinates (codes 30 and 31). The lines are</PRE>< RE class=prog_in_0>' placed on the layer " olygon."</PRE>< RE class=prog_in_0>'</PRE>< RE class=prog_in_0>Sub WriteDXFPolygon( _</PRE>< RE class=prog_in_0> dxfFile As String, iSides As Integer, _</PRE>< RE class=prog_in_0> dblX As Double, dblY As Double, dblLen As Double)</PRE>< RE class=prog_in_0> Dim i As Integer</PRE>< RE class=prog_in_0> Dim dblA1, dblA, dblPI, dblNX, dblNY As Double</PRE>< RE class=prog_in_0> Open dxfFile For Output As #1</PRE>< RE class=prog_in_0> Print #1, 0</PRE>< RE class=prog_in_0> Print #1, "SECTION"</PRE>< RE class=prog_in_0> Print #1, 2</PRE>< RE class=prog_in_0> Print #1, "ENTITIES"</PRE>< RE class=prog_in_0> dblPI = Atn(1) * 4</PRE>< RE class=prog_in_0> dblA1 = (2 * dblPI) / iSides</PRE>< RE class=prog_in_0> dblA = dblPI / 2</PRE>< RE class=prog_in_0> For i = 1 To iSides</PRE>< RE class=prog_in_0> Print #1, 0</PRE>< RE class=prog_in_0> Print #1, "LINE"</PRE>< RE class=prog_in_0> Print #1, 8</PRE>< RE class=prog_in_0> Print #1, " olygon"</PRE>< RE class=prog_in_0> Print #1, 10</PRE>< RE class=prog_in_0> Print #1, dblX</PRE>< RE class=prog_in_0> Print #1, 20</PRE>< RE class=prog_in_0> Print #1, dblY</PRE>< RE class=prog_in_0> dblNX = dblLen * Cos(dblA) + dblX</PRE>< RE class=prog_in_0> dblNY = dblLen * Sin(dblA) + dblY</PRE>< RE class=prog_in_0> Print #1, 11</PRE>< RE class=prog_in_0> Print #1, dblNX</PRE>< RE class=prog_in_0> Print #1, 21</PRE>< RE class=prog_in_0> Print #1, dblNY</PRE>< RE class=prog_in_0> dblX = dblNX</PRE>< RE class=prog_in_0> dblY = dblNY</PRE>< RE class=prog_in_0> dblA = dblA + dblA1</PRE>< RE class=prog_in_0> Next i</PRE>< RE class=prog_in_0> Print #1, 0</PRE>< RE class=prog_in_0> Print #1, "ENDSEC"</PRE>< RE class=prog_in_0> Print #1, 0</PRE>< RE class=prog_in_0> Print #1, "EOF"</PRE>< RE class=prog_in_0> Close #1</PRE>< RE class=prog_in_end_0>End Sub</PRE></PRE> |
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