How do I read a range of data from an open and "live" Excel file using LV7.0 Express
I need to interface with software which continuously (once per second) writes a new array to a fixed location in an open Excel file. I would like to read this data into Labview from where I can do what I like with it. I am relatively new to LabView and have tried all "Read Data" examples that come with the product, Active examples seem very unclear. Anyone got any samples/suggestions to get me started?
Attachments:
Changing_Excel_file.xls 17 KB
It is possible but might be a little bit complicated. Does your application opens the Excel file or Excel file was opened through Excel or another application already?
In the first senario, once the excel is opened, start reading the data, do not close the report file (dispose the report) or close the excel file
In the second senario, it is a little bit more complicated. You need to use low level Excel ActiveX functions. The procedure is:
1. Open reference to Excel
2. Activate the desired workbook if it is already opened
or open a new file
3. Activate the sheet containing the data
4. Read the data
5. Loop if necessary (step 2 if diff wb, step 3 if diff sht, 4 if same sheet)
6. Close Excel reference (Very important, close the
ref only, do not use Application.Exit to exit Excel).
Hope this helps,
-Joe
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Points will be rewarded,
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This is not your requirment but u can try this :
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How to export data from a Dynpro table to Excel file?
Hi
Here I go again. I read the post <b>Looking for example to export data from a DynPro table to Excel file</b> and put the code lines into a Web Dynpro Project where we need to export a dynpro table to Excel file but exactly at line 23 it doesn't recognize <b>workBook = new HSSFWorkbook();</b>
1 //Declare this in the end between the Begin others block.
2
3 private FileOutputStream out = null;
4 private HSSFWorkbook workBook = null;
5 private HSSFSheet hsSheet = null;
6 private HSSFRow row = null;
7 private HSSFCell cell = null;
8 private HSSFCellStyle cs = null;
9 private HSSFCellStyle cs1 = null;
10 private HSSFCellStyle cs2 = null;
11 private HSSFDataFormat dataFormat = null;
12 private HSSFFont f = null;
13 private HSSFFont f1 = null;
14
15 //Code to create the Excel.
16
17 public void onActionExportToExcel(com.sap.tc.webdynpro.progmodel.api.IWDCustomEvent wdEvent )
18 {
19 //@@begin onActionExportToExcel(ServerEvent)
20 try
21 {
22 out = new FileOutputStream("C:/mydirectory/myfiles/testexcel.xls");
23 workBook = new HSSFWorkbook();
24 hsSheet = workBook.createSheet("My Sheet");
25 cs = workBook.createCellStyle();
26 cs1 = workBook.createCellStyle();
27 cs2 = workBook.createCellStyle();
28 dataFormat = workBook.createDataFormat();
29 f = workBook.createFont();
30 f1 = workBook.createFont();
31 f.setFontHeightInPoints((short) 12);
32 // make it blue
33 f.setColor( (short)HSSFFont.COLOR_NORMAL );
34 // make it bold
35 // arial is the default font
36 f.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
37
38 // set font 2 to 10 point type
39 f1.setFontHeightInPoints((short) 10);
40 // make it red
41 f1.setColor( (short)HSSFFont.COLOR_RED );
42 // make it bold
43 f1.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
44 f1.setStrikeout(true);
45 cs.setFont(f);
46 cs.setDataFormat(dataFormat.getFormat("#,##0.0"));
47
48 // set a thick border
49 cs2.setBorderBottom(cs2.BORDER_THICK);
50
51 // fill w fg fill color
52 cs2.setFillPattern((short) HSSFCellStyle.SOLID_FOREGROUND);
53 cs2.setFillBackgroundColor((short)HSSFCellStyle.SOLID_FOREGROUND);
54 // set the cell format to text see HSSFDataFormat for a full list
55 cs2.setDataFormat(HSSFDataFormat.getBuiltinFormat("text"));
56 cs2.setFont(f1);
57 cs2.setLocked(true);
58 cs2.setWrapText(true);
59 row = hsSheet.createRow(0);
60 hsSheet.createFreezePane(0,1,1,1);
61 for(int i=1; i<10;i++)
62 {
63 cell = row.createCell((short)i);
64 cell.setCellValue("Excel Column "+i);
65 cell.setCellStyle(cs2);
66 }
67 workBook.write(out);
68 out.close();
69
70 //Read the file that was created.
71
72 FileInputStream fin = new FileInputStream("C:/mydirectory/myfiles/testexcel.xls");
73 byte b[] = new byte[fin.available()];
74 fin.read(b,0,b.length);
75 fin.close();
76
77 wdContext.currentContextElement().setDataContent(b);
78 }
79 catch(Exception e)
80 {
81 wdComponentAPI.getComponent().getMessageManager().reportException("Exception while reading file "+e,true);
82 }
83 //@@end
84 }
I don't know why this happen? Any information I will appreciate it.
Thanks in advance!!!
Tokio Franco ChangAfter test the code lines appears this error stacktrace:
[code]
java.lang.NoClassDefFoundError: org/apache/poi/hssf/usermodel/HSSFWorkbook
at com.sap.tc.webdynpro.progmodel.api.iwdcustomevent.ExportToExcel.onActionAct1(ExportToExcel.java:232)
at com.sap.tc.webdynpro.progmodel.api.iwdcustomevent.wdp.InternalExportToExcel.wdInvokeEventHandler(InternalExportToExcel.java:147)
at com.sap.tc.webdynpro.progmodel.generation.DelegatingView.invokeEventHandler(DelegatingView.java:87)
at com.sap.tc.webdynpro.progmodel.controller.Action.fire(Action.java:67)
at com.sap.tc.webdynpro.clientserver.task.WebDynproMainTask.handleAction(WebDynproMainTask.java:101)
at com.sap.tc.webdynpro.clientserver.task.WebDynproMainTask.handleActionEvent(WebDynproMainTask.java:304)
at com.sap.tc.webdynpro.clientserver.task.WebDynproMainTask.execute(WebDynproMainTask.java:649)
at com.sap.tc.webdynpro.clientserver.cal.AbstractClient.executeTasks(AbstractClient.java:59)
at com.sap.tc.webdynpro.clientserver.cal.ClientManager.doProcessing(ClientManager.java:252)
at com.sap.tc.webdynpro.serverimpl.defaultimpl.DispatcherServlet.doWebDynproProcessing(DispatcherServlet.java:154)
at com.sap.tc.webdynpro.serverimpl.defaultimpl.DispatcherServlet.doContent(DispatcherServlet.java:116)
at com.sap.tc.webdynpro.serverimpl.defaultimpl.DispatcherServlet.doPost(DispatcherServlet.java:55)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.runServlet(HttpHandlerImpl.java:392)
at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.handleRequest(HttpHandlerImpl.java:266)
at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:345)
at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:323)
at com.sap.engine.services.httpserver.server.RequestAnalizer.invokeWebContainer(RequestAnalizer.java:865)
at com.sap.engine.services.httpserver.server.RequestAnalizer.handle(RequestAnalizer.java:240)
at com.sap.engine.services.httpserver.server.Client.handle(Client.java:92)
at com.sap.engine.services.httpserver.server.Processor.request(Processor.java:148)
at com.sap.engine.core.service630.context.cluster.session.ApplicationSessionMessageListener.process(ApplicationSessionMessageListener.java:37)
at com.sap.engine.core.cluster.impl6.session.UnorderedChannel$MessageRunner.run(UnorderedChannel.java:71)
at com.sap.engine.core.thread.impl3.ActionObject.run(ActionObject.java:37)
at java.security.AccessController.doPrivileged(Native Method)
at com.sap.engine.core.thread.impl3.SingleThread.execute(SingleThread.java:95)
at com.sap.engine.core.thread.impl3.SingleThread.run(SingleThread.java:159)
Thanks in advance!!!
Tokio Franco Chang
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Required text (Russian):
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Hello,
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Have someone already made something like this and can show me an example?Hi
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/people/perumal.kanthan/blog/2005/03/21/reading-excel-data-from-java-using-hssf-api
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private HSSFCellStyle cs = null;
private HSSFCellStyle cs1 = null;
private HSSFCellStyle cs2 = null;
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binaryType.setFileName("testexcel.xls");
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regards
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JimThe VI DB Tools Select Data has an input called (at the top) called "optional clause". You can wire an SQL predicate to this input that control the rows that are returned by the VI. In your case, you want to use what's called a WHERE clause to filter the rows to be the subset you need.
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Message Edited by PramodS on 04-09-2008 01:26 AM
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