I am writing my data to an Excel file. I have two functions, create excel file and close excel file. When I am creating the first excel file, everything works fine, but creating another one after the first has been closen, I am getting an "NullReferenceException" exception.
Dim xl As New Excel.Application
Dim wkb As Excel.Workbook
Dim wks As Excel.Worksheet
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I am extracting a column with 8760 cells from an excel file to my graph in my vb application. I managed to open and close the excell sheet from my program. However, when I try to run my application I receive this message:
There is a large amount of information on the clipboard do you want to be able to paste this into to another program later?
Is there a way that I can avoid receiving this message when calling the data from the excell file?
my program I want to load an excel file that contains the names and scores of a competition, store the values as a public variable, do some calculations on it and then store the values back on the excel file.
View 11 RepliesForm1 is a mdi container. It has a bunch of forms that can load inside of it as mdi children. If I close each open form inside the form1, and then click the red X at the top right, application exits fine.If I click the red X without closing the forms inside I get: An unhandled exception of type 'System.CannotUnloadAppDomainException' occurred in mscorlib.dll
Additional information: Error while unloading appdomain. (Exception from HRESULT: 0x80131015) However I can break from it. How do I get the application to not show that error? What must I do to fix those inside forms or close when the red x is clicked?
i just found a new error problem on my app.. i have a save button that saves text1. as the file name and text2. as the content.. i recently tried to save this file name on my app: HKEY_LOCAL_MACHINESoftwareC07ft5Y as a file name, and due to the in the file name, it made my app error and close without being able to save my file.. my question is, how to bring a msgbox saying "invalid characters in file name" instead of causing it to error and shut down. (just found out that registry entry is for SafeDisc-enabled products, although, i'm not fully sure..)
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I have a reguirement to enable the creation of excel workbooks from sql stored procedure. To do this I want to create a vb class to generate and save the excel files. Then and ASP.net page will enable opening the excel file via the browser or enable the user to download the file.The class should be able to be called from a vareity of pages within the web app and have the ability to handle 8 to 10 separate stored procedures that will return various data sets.
View 2 RepliesI keep getting a "System.Runtime.Serialization.SerializationException" in my application while loading a not-defined assembly (AKA: Plug-in loading.)Even if I turn Serialization on for that plug-in, then it will fail once again. I've been looking around and couldn't find a good tutorial about it..
So all together: How to load an assembly using AppDomain?
I downloaded and installed Visual Basic 2005 Express Edition and it was successfully installed in my system but when I run the application and create a new project then select a template of my choice the status bar displays:Creating project '...'... project creation failed. I tried to reinstalled it again and also repair the installation of Visual Basic 2005 Express but I have the same error all over again.
View 4 RepliesI am having issues using interop with office excel in .net. I have tried a lot of things to close the excel application, workbook and worksheets i create to use in my program but i always notice the excel.exe still in memory. I have even tried forcing the garbage collector,
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I work for a financial firm doing vb.net work.I open an excel doc and populate it using calls to range...i however dont dim the range...I call xlsSheet.Range.ValueI have about 30 ranges i update in this method before printingdo i need to set the .Range.Value to Nothing in order to close the excel.exe
View 9 RepliesOkay so my program opens excel, reads a few cells, and closes excel. But, it does not fully close excel and after multiple runs, I have multiple EXCEL.EXE *32 in my process list. It also asks for a save when it's closing when there are no changes being made, is there any way to avoid this? And how do you get Excel to fully close?
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The program closes, without asking for a save, gets me the data I need, but remains in the process list.
Using this for my Imports
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sql = "CREATE TABLE tblPrograms ([index] Counter," & _
"[lngPlatformFK] TEXT(255) NOT NULL," & _
"[strCompany] TEXT(255)," & _
"[strProgramName] TEXT(255) NOT NULL," & _
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When running the previous sql query i am getting a syntax error. This database is a access 2003 database using the Jet 4.0 OleDB driver.
What I wanted to do is close all opened workbooks. This code does the work IF there is at least one or more opened workbooks. My problem is IF there is NO opened workbook at all; It goes around unendlessly in the WHILE Loop. How do I not process the closing IF there is no any opened workbook at all? (NOTE: I found this code from somewhere else.)
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When I run the following code, I get the exception below:
''# NOTE: ExcelApp is a Private main form variable
Dim ReportBooks As Excel.Workbooks = ExcelApp.Workbooks
Dim ReportBook As Excel.Workbook = ReportBooks.Open(localFilename)
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I used the code previously added by Mike Rosenblum but Excel is still not closing, Here is my code:
Imports Microsoft.Office.Interop
Imports Excel = Microsoft.Office.Interop.Excel
Imports System.Runtime.InteropServices
Private Sub Check_For_Xcel(ByVal filename As String)
Dim varpath As String = ""
Dim varvalue As String = ""
Dim xlapp As New Excel.Application
Dim xlbook1 As Excel.Workbook = xlapp.Workbooks.Add()
Try
varpath = filename
xlbook1 = GetObject(varpath)
xlbook1.Application.Visible = True
xlbook1.Windows(1).Visible = True
xlbook1.Application.WindowState = Excel.XlWindowState.xlMinimized
For irow = 2 To 65536
For icol = 1 To 4
Select Case icol
Case 1
read_date_time = xlbook1.Worksheets(1).Cells(irow, icol).Value
Case 2
read_plate = xlbook1.Worksheets(1).Cells(irow, icol).Value
Case 3
read_plate_state = xlbook1.Worksheets(1).Cells(irow, icol).Value
Case 4
read_location = xlbook1.Worksheets(1).Cells(irow, icol).Value
End Select
Next
If read_plate = Nothing Then Exit For
Check_IF_Present(read_plate, read_plate_state)
Next
If Not xlapp Is Nothing Then
GC.Collect()
GC.WaitForPendingFinalizers()
GC.Collect()
GC.WaitForPendingFinalizers()
Marshal.FinalReleaseComObject(xlbook1.Worksheets)
xlbook1.Close(SaveChanges:=False)
Marshal.FinalReleaseComObject(xlbook1)
xlapp.Quit()
Marshal.FinalReleaseComObject(xlapp)
End If
xlbook1 = Nothing
xlapp = Nothing
GC.Collect()
GC.WaitForPendingFinalizers()
Catch ex As Exception
MsgBox(ex.Message, MsgBoxStyle.Critical, "Error at Check for Xcel")
End Try
End Sub
I have a vb.net application that opens two workbooks excel, if I close the excel file and try to reopen them is still an error:"COM object that has been separated from its underlyng RWC cannot be used".
View 9 RepliesI have found many pages referring to having the date be part of a txt file being created, but not like the way I need. Having said that, this is what I've got.. [code] I read a page on working with txt files and learned what I could from it. It said to use the method in the beginning of my code for creating the file. It works great, but I would like to have a new file name everday, hence the date being integrated. So even if program was running, when midnight hits, a new txt file is created and new entries are written to that file. But I can't even get the date to be put in there. Everytime I try to make this work by using methods I read about in other pages, I get a syntax error, or a warning saying an end of statement is expected. I'm not sure those methods are compatible with what I've already got going.I was actually trying to store these values in a database, and I got real close I think, but I couldn't get any help to fix my problem so I'm trying to write to daily txt files instead. url....
View 6 RepliesI am trying to just write something to a cell in a sheet and I am getting the error message:
Exception Exception from HRESULT: 0x800A03EC Stack Trace: at System.RuntimeType.ForwardCallToInvokeMember(String memberName, BindingFlags flags, Object target, Int32[] aWrapperTypes, MessageData& msgData)
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Dim excel As New Microsoft.Office.Interop.Excel.Application()
Dim wb As Microsoft.Office.Interop.Excel.Workbook = excel.Workbooks.Open(txtFileLocations.Lines(w))
Dim ws As Microsoft.Office.Interop.Excel.Worksheet = TryCast(excel.ActiveSheet, Microsoft.Office.Interop.Excel.Worksheet)
when the program tries to opens an excel file, it always throws me an error "Office has detected a problem with this file. Editing may hard your computer" and my program crushes.......The problem appears on the SECOND line, on DIM wb...blahblah.. i went to the office and unclicked the "protected view" checkboxes.. but it still throws me those errors. my guess is that the office i have in the computer is not the same as the one that my program uses to open excel files (i mean, i loaded/imported some excel.dll files in the program so i guess that will be the one) But how do i make the program not care if the excel file is "potentially dangerous"?
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when the program tries to opens an excel file, it always throws me an error "Office has detected a problem with this file. Editing may hard your computer" and my program crushes. The problem appears on the SECOND line, on DIM wb.
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I'm trying to open an Excel file to get and set some values. Unfortunately, I have no choice, I must to work with Excel.
Dim xAp As New Microsoft.Office.Interop.Excel.Application
Dim xWkb As Microsoft.Office.Interop.Excel.Workbook
xWkb = xAp.Workbooks.Open("c:uploads este.xls")
Always I have this exception: (Exception from HRESULT: 0x80010105 (RPC_E_SERVERFAULT))
Need I Excel installed in server machine to open Excel files? I don't think so, because when I create a new application and workbook throught code, all things go right, but... its a possibility...
I am using visual studio to create an application that opens an excel file and then for each entry in the first column the entry in the second column is stored in an array. Then excel opens two other workbooks and for each entry in the first column it searches for a match in these other two workbooks and stores the corresponding value in an array.
Anyway, the problem is closing excel afterwards. I have used the thread: [URL] to work through the basics of cleaning up. I used the cleanup code provided and added the WithEvents caveat. I do not have strict option on.
I believe the problem is the fact that I have three workbooks open.
This is my cleanup code: (wrkbk, wrkbk2, wrkbk3 are the workbooks; datasheet, datasheet2, datasheet 3 are the worksheets; excel is the application)
Code:
GC.Collect()
GC.WaitForPendingFinalizers()
GC.Collect()
[Code]....
I got the impression that order was important in the cleanup procedure so I have tried some variations of moving the workbooks and worksheets around.
I have a files list which contain the directory of file. I want to know file creation date of that files. I used fileInof.CreationTime. But It is not displayed creation date. How I can know about this.
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how can i write <p> <br/> hello this is my creation </p> in xml file while i am creating it by the use of asp.net .
it is showing <P> text </P>
i wants to create an dll (classlibrary) file for displaying selected data form database by using a gridview control.for this iam creating an dll file , in that how to declare gridview1 [code]
View 1 RepliesError Opening Excel File Read Only ODBC
View 1 RepliesHere are some important facts:
This code works (no Error 1004 on numerous laptops and desktops) A couple of months ago it began to fail (Error 1004 reared it's ugly head) on a couple of machines. The users claim that nothing changed - I can neither confirm nor deny accuracy of these claims. All users, except one, are running Windows XP and Office 2003. The problem also surfaced on a new machine running Windows XP and Office 2007. I could not force the error on my development/test machine - Windows XP with Offic 2003. It fails every time on another machine I have running Vista with Office 2007
The following is the code that causes me the problem. I know the error is raised on the WB.Save statement. I added the error trap to eliminate the problem of the Excel file being unaccessable without a reboot, due to the fact that Windows thought Excel still had it open.
Public Sub ExportCostAnalysis(ByVal RunMode As String)
On Error GoTo ErrorHandler
As dao.Recordset
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I'm trying to make my application append to a simple log file when it executed and when it's closed. So far, so good (see code)
However, what I would like to do, is have future lines of text to be written on the next line instead of the same line. And possibly a date stamp.
I'm not quite sure how to implement this as far as syntax goes.
My.Computer.FileSystem.WriteAllText("C:log.txt", "Application was closed ", True)
I'm trying to save a files save date, modify that file and then restore the file back to it's original date. I can't get it to work, I've tried it several ways and cannot get it to work.
My code so far is
origdate = My.Computer.FileSystem.GetFileInfo("inspection").L astWriteTime.ToShortDateString()
' changing file content here
System.IO.File.SetLastAccessTime("inspection", origdate)
How can I check for characters not allowed for file creation programmatically? you know like the / <> and so.
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