Rob van der Woude's Scripting Pages
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Source code for yahoofx.vbs

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  1. Option Explicit
  2.  
  3. Dim dblAmount, dblConvert, dblExch, intArgs, strFromCurr, strToCurr
  4.  
  5. ' Initial values
  6. dblAmount = 0
  7. intArgs   = 0
  8.  
  9. ' Check command line arguments
  10. If WScript.Arguments.Count <> 3 Then Syntax ""
  11. If WScript.Arguments.Named.Exists( "Amount" ) Then
  12. 	dblAmount = WScript.Arguments.Named( "Amount" )
  13. 	intArgs = intArgs + 1
  14. End If
  15. If WScript.Arguments.Named.Exists( "A" ) Then
  16. 	dblAmount = WScript.Arguments.Named( "A" )
  17. 	intArgs = intArgs + 1
  18. End If
  19. If WScript.Arguments.Named.Exists( "From" ) Then
  20. 	strFromCurr = WScript.Arguments.Named( "From" )
  21. 	intArgs = intArgs + 1
  22. End If
  23. If WScript.Arguments.Named.Exists( "F" ) Then
  24. 	strFromCurr = WScript.Arguments.Named( "F" )
  25. 	intArgs = intArgs + 1
  26. End If
  27. If WScript.Arguments.Named.Exists( "To" ) Then
  28. 	strToCurr = WScript.Arguments.Named( "To" )
  29. 	intArgs = intArgs + 1
  30. End If
  31. If WScript.Arguments.Named.Exists( "T" ) Then
  32. 	strToCurr = WScript.Arguments.Named( "T" )
  33. 	intArgs = intArgs + 1
  34. End If
  35. If dblAmount = 0 And WScript.Arguments.Unnamed.Count = 1 Then
  36. 	dblAmount = WScript.Arguments.Unnamed(0)
  37. 	intArgs = intArgs + 1
  38. End If
  39. If intArgs <> 3 Then Syntax ""
  40.  
  41. ' Validate command line arguments
  42. If Not IsNumeric( dblAmount ) Then
  43. 	Syntax dblAmount & " is not a valid amount"
  44. End If
  45. If dblAmount <= 0 Then
  46. 	Syntax "Amount must be greater than 0"
  47. End If
  48. If Len( strFromCurr ) <> 3 Then
  49. 	Syntax strFromCurr & " is not a valid ISO 4217 currency abbreviation." & vbCrLf _
  50. 	     & "Look up valid currency codes at http://www.oanda.com/site/help/iso_code.shtml"
  51. End If
  52. If Len( strToCurr ) <> 3 Then
  53. 	Syntax strToCurr & " is not a valid ISO 4217 currency abbreviation." & vbCrLf _
  54. 	     & "Look up valid currency codes at http://www.oanda.com/site/help/iso_code.shtml"
  55. End If
  56.  
  57. ' Retrieve the exchange rate for these currencies
  58. dblConvert  = YahooTrade( strFromCurr, strToCurr )
  59. If dblConvert = 0 Then
  60. 	Syntax "Error retrieving exchange rate"
  61. Else
  62. 	' Format the screen output
  63. 	dblExch = FormatNumber( dblConvert * dblAmount, 2, True, False, False )
  64. 	WScript.Echo strFromCurr & " " & dblAmount & " = " & strToCurr & " " & dblExch
  65. End If
  66.  
  67.  
  68. Sub Syntax( errMsg )
  69. 	Dim StdIn, strMsg
  70. 	If errMsg <> "" Then WScript.Echo "Error: " & errMsg
  71. 	strMsg = "YahooFX.vbs,  Version 1.00" & vbCrLf _
  72. 	       & "Calculate exchange rates" & vbCrLf & vbCrLf _
  73. 	       & "Usage:   YAHOOFX.VBS [/Amount:]amount /From:icc /To:icc" _
  74. 	       & vbCrLf & vbCrLf _
  75. 	       & "Where:   /A:amount   The amount that has to be converted" _
  76. 	       & vbCrLf _
  77. 	       & "         /F:icc      ISO 4217 currency code for amount" _
  78. 	       & vbCrLf _
  79. 	       & "         /T:icc      ISO 4217 currency code to convert to" _
  80. 	       & vbCrLf & vbCrLf _
  81. 	       & "Notes:   [1] Switches may be abbreviated, " _
  82. 	       & "e.g. /A and /AMOUNT are identical" & vbCrLf _
  83. 	       & "         [2] Look up valid ISO 4217 currency codes at" _
  84. 	       & vbCrLf _
  85. 	       & "             http://www.oanda.com/site/help/iso_code.shtml" _
  86. 	       & vbCrLf _
  87. 	       & "         [3] This script uses Yahoo's currency pages " _
  88. 	       & "(http://finance.yahoo.com)" & vbCrLf _
  89. 	       & "             to retrieve the current exchange rate " _
  90. 	       & "for our two currencies, so" & vbCrLf _
  91. 	       & "             this script will be broken as soon as " _
  92. 	       & "Yahoo changes these pages." & vbCrLf _
  93. 	       & "         [4] The author of this script cannot " _
  94. 	       & "be held responsible for any" & vbCrLf _
  95. 	       & "             damage, direct nor consequential, " _
  96. 	       & "caused by the use of or" & vbCrLf _
  97. 	       & "             inability to use this script. " _
  98. 	       & "Do not make any financial decisions" & vbCrLf _
  99. 	       & "             based on the output of this script. " _
  100. 	       & "Always consult a ""second" & vbCrLf _
  101. 	       & "             source"" before making any decision." _
  102. 	       & vbCrLf _
  103. 	       & "             Use this script entirely at your own risk." _
  104. 	       & vbCrLf & vbCrLf _
  105. 	       & "Examples:" & vbCrLf _
  106. 	       & "    Convert 2000 US Dollars to Euros:" & vbCrLf _
  107. 	       & "        YAHOOFX.VBS /AMOUNT:2000 /FROM:USD /TO:EUR" & vbCrLf _
  108.            & "    Convert 1120 Danish Krones to Indian Rupees:" & vbCrLf _
  109. 	       & "        YAHOOFX.VBS 1120 /F:DKK /T:INR" & vbCrLf & vbCrLf _
  110. 	       & "Written by Rob van der Woude" & vbCrLf _
  111. 	       & "http://www.robvanderwoude.com"
  112. 	WScript.Echo strMsg
  113. 	WScript.Quit 1
  114. End Sub
  115.  
  116.  
  117. Function YahooTrade( myFromCurr, myToCurr )
  118. ' This function retrieves the exchange rate
  119. ' for any two currencies from finance.yahoo.com
  120. '
  121. ' Arguments:
  122. ' myFromCurr [string]  ISO 4217 3 letter code for the currency to convert from
  123. ' myToCurr   [string]  ISO 4217 3 letter code for the currency to convert to
  124. '
  125. ' Look up currency codes at http://www.oanda.com/site/help/iso_code.shtml
  126. '
  127. ' Returns:
  128. ' Conversion rate as number
  129. '
  130. ' Disclaimer:
  131. ' This script uses http://finance.yahoo.com to retrieve exchange rates.
  132. ' This script will break when Yahoo changes its web page layout or content.
  133. ' The author of this script cannot be held responsible for any damage, direct
  134. ' nor consequential, caused by the use of or inability to use this script.
  135. ' Do not make any financial decisions based on the output of this script.
  136. ' Always use a "second source" before making any decision.
  137. ' Use this script entirely at your own risk.
  138. '
  139. ' Written by Rob van der Woude
  140. ' http://www.robvanderwoude.com
  141. 	Dim colMatches, intLastSubMatch, objHTTP, objRE, strConversion
  142. 	Dim strDecimal, strMyAmount, strResponse, strURL, strUserAgent
  143.  
  144. 	' Get the locally used decimal delimiter
  145. 	strDecimal  = Replace( FormatNumber( 0, 1, True ), "0", "" )
  146.  
  147. 	' Retrieve Yahoo's web page containing the our currencies' exchange rate
  148. 	Set objHTTP = CreateObject( "WinHttp.WinHttpRequest.5.1" )
  149. 	strURL = "http://finance.yahoo.com/q?s=" _
  150. 	       & UCase( myFromCurr & myToCurr ) & "=X"
  151. 	objHTTP.Open "GET", strURL, False
  152. 	strUserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows 98)"
  153. 	objHTTP.SetRequestHeader "UserAgent", strUserAgent
  154. 	objHTTP.Send
  155. 	strResponse = objHTTP.ResponseText
  156. 	Set objHTTP = Nothing
  157.  
  158. 	' Extract and return the exchange rate from
  159. 	' the web page; in case of error return 0
  160. 	Set objRE        = New RegExp
  161. 	objRE.Global     = False
  162. 	objRE.IgnoreCase = True
  163. 	objRE.Pattern    = ">Last Trade:(<[^>]+>)+([.0-9]+)<[^>]+>"
  164. 	Set colMatches   = objRE.Execute( strResponse )
  165. 	If colMatches.Count = 1 Then
  166. 		intLastSubMatch = colMatches.Item(0).Submatches.Count - 1
  167. 		strConversion   = colMatches.Item(0).Submatches( intLastSubMatch )
  168. 		If IsNumeric( strConversion ) Then
  169. 			' Convert the match from string to number,
  170. 			' using the local decimal delimiter
  171. 			strConversion = CDbl( Replace( strConversion, ".", strDecimal ) )
  172. 			YahooTrade = strConversion
  173. 		Else
  174. 			YahooTrade = 0
  175. 		End If
  176. 	Else
  177. 		YahooTrade = 0
  178. 	End If
  179. 	Set colMatches = Nothing
  180. 	Set objRE      = Nothing
  181. End Function
  182.  

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