When we use system.io.ReadLines the content of the file should not be loaded to memory right? say I want to create a function. The function accept a string, say "post.txt" where post.txt is a large file (3G) I want to put the first 100k line of post.txt on post.txt and the rest on reserve_post.txt
View 11 RepliesI don't know whether it is simple or not because i am new to programming. my requirement is : In my vb.net winform application, the filenames of the files present in "D:Project" willbe displayed in DataGridView1 control. Now I want to load these files one after another into memory stream buffer and add the headers("ID","Name","Class") to the content in the file. Then I want to save these files in "C:" with "_de" as suufix to the filename i.e.,sample_de.csv.
View 1 RepliesI have an application that uses many forms and a couple of modules. One module modMain contains my subMain that starts the application. In subMain an instance of frmMainMenu (insFrmMainMenu) is created with a menubar. As the user selects an item from the menu bar, an instance of a specific form is created (for example insFrmViewCustomer). That instance is opened with the ShowDialog method. When the form insFrmViewCustomer is closed, a statement in insFrmMainMenu disposes the instance of insFrmViewCustomer. modMain also contains many public functions and subs, as well as public variables. The other modules contain public functions and subs.
So, What is loaded into memory when the application starts?
And Is there a tool within Visual Studio that tells me the answer to the first question?
I have a function that accepts a string and generates an email attachment based on that string. It works fine for html pages, text documents, and so forth but I can not get it to generate a PDF file.
Code:
Public Sub SendMail _
( _
ByVal strFrom As String _
[code]......
If I save the file attachment as Whatever.PDF i get the error that it was not encoded properly.I am using datadynamics active reports PDF exporter to generate the PDF
dim pdf as new datadynamics.activereports.export.pdf.pdfexport
sendmail("from@", "to@", "test", "test", pdf.tostring, "pdf.pdf")
I think the problem is I am converting the PDF to a string, and then trying to convert it back to a PDF and attach it to the email but I am not 100% sure.
WebBrowser Example.zip IntroductionBecause the WebBrowser control that we use in .NET is a COM control, not all of its uses are straightforward and some of them (even those which seem like they should be easy) require that we dip into our Interop toolbox in order to properly implement them.
A perfect example of this is loading HTML content into the WebBrowser from memory, rather than a file or a URL. Anyone who's ever used the WebBrowser control before is familiar with the Navigate2 method, which tells the control to load content from a URL (or path to a file). Loading HTML content from memory, however, is a rather elusive practice because of the many steps involved in making it work.
MSHTML.HTMLDocumentYou might notice that the WebBrowser control exposes a "document" property. The object returned by this property can be coerced to the type of "mshtml.HTMLDocument" (you must add a reference to MSHTML to your project in order to make this work) as follows:
Code:Dim clsDocument As mshtml.HTMLDocument = CType(WebBrowser.Document, mshtml.HTMLDocument)
(NOTE: You will have to add a reference to the COM library MSHTML to your project to make this compile)
Once we create an instance of HTMLDocument, a whole new world opens up to us, providing all sorts of DOM access to the content of any given Web page.
If we were to create our own HTMLDocument object from memory, we could use the "write" method to write HTML content to the document from a string variable, like this:
Code:'initialize the document object within the HTMLDocument class... clsDocument.close() clsDocument.open("about:blank")
'write the HTML to the document using the MSHTML "write" method... Dim clsHTML() As Object = {sHTML} m_clsDocument.write(clsHTML) clsHTML= Nothing
WebBrowser Control ImplementationUsing the HTMLDocument returned by the "document" property of the WebBrowser control, however, is not as straight-forward. Because of the way that this object is created and initialized in memory (by the COM WebBrowser control), the "write" method fails when called as above. In order to write content to the HTMLDocument exposed by the WebBrowser control, we must first marshal the string value to a memory space that is compatible with COM. Once the string is properly marshalled, the COM interface IPersistStreamInit (implemented by the HTMLDocument class) must be used to pass the value into the object.
Interop DeclarationsIn order to pull all of this off, we must declare several Interop pieces, including an enumeration, a function, and two interfaces. The declarations for these pieces are as follows:
[Code]....
I have a few module questions i'd like to ask as i cant find much info on the internet.
How do you know if a file is locked by a module? I know how to display modules of a file but surely all 10+ DLL are actually locking the file from being deleted?
Basically im wanting to make a file unlocked.Secondly is this the correct way to unload a DLL
[Code]...
I am trying to create a plugin system where plugins can be dynamicly loaded (we don't know how many there are, what their classes are called, ...)This is sample code for a plugin:
Code:
Public Interface IPlugin
Sub bla()
Function bla3() As String
End Interface
[code]....
This code SHOULD msgbox("yay") when it finds a type that implements my IPlugin interface. Yet it never finds one. I can't find what I did wrong. It gets to the debug.print("2"), but never gets past the "If GetType(IPlugin).IsAssignableFrom(t) Then".
why this error System.EnterpriseServices.dll appear when i run the Installed program as testing in another computer..
i did it in 5 computers for testing i got 3 has the same error (the error above) but the other 2 units it work fine...
am developing an inventory management system. have two listview controls. one for ITEM and another for details pertaining date, quantity, cost, issued to and so on. i want a vb.net code that if a given item in listview A is clicked, listview B details are cleared and then the details of that item are loaded and displayed on listview B.there is no criteria of loading like between a range of dates; just all records in the database.
View 1 RepliesOur company has an app that load their components by System.Reflection.Load (By the way, an awesome technique )But, we start to monitorate the application and detect a extrange grow up of memory (actually when our application still all day on air, their allocate memory on task manager is 200 MB plus memory) And all of our components (60 plus DLLs) is load by this technique.My doubt is how to deallocate this assemblies or how the best way to deallocate any assemblies loaded by the System.Reflection.Assemblie.Load method?
View 10 RepliesI am working with application for Excel sheets in vb.net.My database is Sql server 2005.I am having around 8 lakhs of rows in my database and 64 columns.when I import a excel sheet for searching the Duplicate of excel sheet rows in database i get this Error System Out of Memory Exception.What is the reason to occur this kind of Error.Is it due to Excess of rows in database or coding error in Application.
View 2 Repliesexactly how much memory does a System.Func holds?Is there any difference if the System.Func is 1 line or 1000 lines?
View 4 RepliesI was wondering if there was a way to find out how much memory a data structure too up. So say I declared a list of strings.
Dim theRN As New Dictionary(Of String, Integer)
Say it had 25 elements in it. How to find out how much memory those 25 elements are costing me?
I am using .net 2.0 and I am getting an exception of system is out of memory. My existing function takes datatable as input parameter which contains little bit large data (eg. more than 35000 rows) and in that function I am appending some xml node data and atlast I am returning the stringbuilder as a object.
[Code]...
I receive random AccessViolationException on client machines. I have captured the exception text and have pasted it below. Unfortunately this error is not happening on code that I have written it appears to be happening when the .NET is trying to draw a group box on the form. System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.at System.Drawing.SafeNativeMethods.Gdip.GdipDrawLineI(HandleRef graphics, HandleRef pen, Int32 x1, Int32 y1, Int32 x2, Int32 y2)at System.Drawing.Graphics.DrawLine(Pen pen, Int32 x1, Int32 y1, Int32 x2, Int32 y2)
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I am using a VB script in SSIS Script Task to add header and Trailer to a flat file. The code was working fine until recently i came across a problem where the rows in the file are more than usual and resulting in a failure on script task with error`Error:
System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.OutOfMemoryException: Exception of type 'System.OutOfMemoryException' was thrown.
[Code]....
Can a .WPF file be loaded into a tab or a container in my visual basic application. Ill use one of my code snippets as an example. to load another form into a tab control i use.
Private Sub AllToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles AllToolStripMenuItem.Click
Dim phoneqq As New PhoneQuote
[Code].....
i have a xdocument.load(file) and after changing some values want to xdocument.save(file)
this save is not possible because file is in use ?
nattelip Private Sub savechfid_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles savechfid.Click
[Code]...
I have two rich text boxes, and two buttons on my screen. The first button grabs HTML from a URL and then converts the HTML to XML which resides in rich text box 1.
The second button is to grab the XML from the rich text box1 and then parse it to grab all the input elements by their ID.
My issue is that my parser isn't doing anything. My guess is that I'm not quite getting the XML from the first rich text box.
What would be the best way to grab the XML from a rich text box load it into memory and then parse the XML to grab all the ID tags?
Here is my code --
Imports mshtml
Imports System.Text
Imports System.Net
[Code].....
I have two rich text boxes, and two buttons on my screen. The first button grabs HTML from a URL and then converts the HTML to XML which resides in rich text box 1. The second button is to grab the XML from the rich text box1 and then parse it to grab all the input elements by their ID.
My issue is that my parser isn't doing anything. My guess is that I'm not quite getting the XML from the first rich text box.What would be the best way to grab the XML from a rich text box load it into memory and then parse the XML to grab all the ID tags?
[Code]...
I've wrote a program awhile ago that prints barcode labels. The old version needed the font to be installed in the fonts folder, but that made it a pain for people using the program for the first time, as the program would print the barcode label with a default font. If I load the font file directly and try and print, it just shows up with the default font, obviously not a barcode. The following doesn't seem to work:
[Code]...
I have ListBox with list of pdf files. On the side of windows form I have webbrowser control that shows selected in list pdf file, using Webbrowser1.navigate(path) method.I want to give to user option to delete selected file. When I try it using system.IO.File.Delete(filepath) method I am getting error: file is being used by another process. Delete works fine without Webbrowser preview,
View 5 RepliesI have my datagridview being loaded from a Text File and then being saved to a text file as a comma separated file - the commas obviously separate the columns. However in some of the cells prior to saving, I have data that i have inputted over two lines by pressing shift + return.
E.g.
"SOLD
10/05/2012"
This saves fine, but obviously shows up in the text file as a line break, which then causes some issues when I choose to re open the info back into DGV. How I can code so that it saves as a line break within a cell, rather than a completely new line.
If we have sample class to store some config data, all is ok, we can save and load it to class.
<XmlRootAttribute("Configuration")> _
Public Class SeriazableClass
#Region "Options"
[code]....
I created a VS2010 application that stores data in xml files with a custom extension (e.g. ".ABC") I would like to be able to open an .ABC file and have the application launch with the specific file's data loaded. This is analogous to opening a Word doc and having Word open with the doc loaded. I have searched for a while but can't even think of a phrase that explains this process. Nothing seems to match "You know . . . that thing that happens when you double click on a data file".
View 2 RepliesI have to generate an XML file from several database tables. I could use the WriteXml method of the DataSet to do it, but the database tables are really huge and I can't add all those tables in the DataSet at the same time or it may cause a problem because of the big amount of memory used. Then I decided to use the DataTable's WriteXml method and save table after table, but the the generated file only stores the information of the last DataTable.WriteXml's call. How can I preserve the previous XML data when adding all that information?
View 4 RepliesI cannot read filename in response header:Content-Disposition: inline; filename="
View 6 RepliesI have a textbox on a form that is set to allow dragdrop operations from txt files.Basically you drag a .txt file onto the txtbox, the content of the text file is displayed in the textbox.All is working fine, however after the textfile is displayed in the textbox, the text box text is for some reason is highlighted.I don't want the text to be highlighted (or selected) after it's being displayed on the textbox.Second issue, after I close the file that I dragged, for some reason even if I didn't make any changes to the file, it is acting as if the file has changed.In another words, if I open a text file using my MenuItem Open item, and if I do not change the file, If I close the file it's fine it closes.However, if I close a file that I draged into the text box and then close the file without changing anything in it, the stringcompare function is telling me that the file has changed... I can't understand why.
View 6 RepliesWhat i am trying to do now is to show the content of the dnsredir.ini file on the forms and able to edit it.
The dnsredir.ini file file looks like this
;Configuration INI file for DNS Redirector v6.4.7
Logging=Normal
ListenOnIP=172.23.128.33
[Code]......
I am trying to decrypt a file and the decrypted contents will be loaded to a listbox.
Public Sub Decrypt(ByVal inName As String, ByVal outName As String)
Try
Dim array As Byte() = New Byte(&H1001 - 1) {}
Dim num2 As Long = 8
Dim stream2 As New FileStream(inName, FileMode.Open, FileAccess.Read)
[Code]...