I have successfully created and written to a .dat text file. The code below shows how I did this.
filename = "Login.dat"
FileOpen(1, filename, OpenMode.Random, , , Len(user))
NoOfRecords = LOF(1) / Len(user)
[code].....
With a program I'm writing, I'm using saved data from program instance to the next. So I'm just using a simple text file to save some data. But the first time the user runs it, obviously the text file will not already be created. How can I write the code to see if the file exists? I tried to use a StreamReader but it trips up when the code runs if the text file does not already exist. And if I use a StreamWriter every time, it will overwrite the file and lose all the data. How I can see if a specific file exists already, and if not create a new one? If it does exist, then open that pre-existing file?
View 2 RepliesHow would I create a dir Inside %temp%? Then extract the file to it and Open a That folder. So far this is my code.
[Code]...
An error occurred creating the form. See Exception.InnerException for details. The error is: Object reference not set to an instance of an object.
View 7 RepliesMy website creates an email from an HTML template using MailDefinition and ending up with a System.Net.Mail.MailMessage object.
Usually, I just call the Net.Mail.SmtpClient.Send method and the email is sent.
Now I need to be able to open the created email in the clients default mail program and then they click their email programs send button to send it.
I have a program that can save user's input into a text file and load it back, but whenever I try to open the file and exit without selecting the file I get an error.(if i select the file and open it i don't get any errors).
This is the code that handles text file loading:
Private Sub Button4_Click(sender As System.Object, e As System.EventArgs) Handles Button4.Click
OpenFileDialog1.InitialDirectory = "C:"
OpenFileDialog1.Filter = "Text Files ONLY (*.txt) | *.txt"
OpenFileDialog1.ShowDialog()
[CODE]...
The error is :"FileNotFoundException was unhandled. Could not find file at xxx". also I would like to know how to make it so that the initial file name for file saving is today's date. I do not get any errors when I try to save the file.
I need to open an excel file from vb.net and then search it for specific data. I then need to take those data and insert them into text boxes on a form that i have created. This is all controlled by a button click. I already have some code that will open a file dialog box and let me navigate to the correct file, but I am having trouble with the search portion. I have tried the Find function but I am not sure of the proper syntax. I am using Visual Studio 2008 and Excel 2003.
[Code]...
Ok what i want to do is have a user specify a directory when this for is opened and have it remembered everytime this for is open,Also i have a few buttons and whenever the user clicks on one of the buttonsa i want it to open a txt file delete everything in it and write a value that i specify
View 9 RepliesI'm having a slight problem getting my program to load a save file when double clicking the save file.I'm using the Command$() to get the command line argument. I can open a save file by dragging it onto the exe. But not by double clicking the save file (after it's associated with the exe).I though dragging and dropping a file on a program and double clicking the file would open it in the same way, but I guess not.So in short how does file association work and how do I get the file path set to a var when the program loads.
View 5 RepliesI got a log file (Log.txt) a timer and a RichTextBox1.Text The timer is opening the log file again and again every milisecond here the code:
Code:
Okay that keeps the track of my log file inside my richtextbox , but there is a big problem there. My richtextbox slows down hard if the log file gets too big.. Sometimes it kicks me out of the program and in taskbar it says Program Not Responding..
I wanted to know if there is a method to read a bigger Log file with out having such issues. (It mostly happens when log file goes over 13000 characters)
I am using VB.net 2005 and I have a timer running on form1 that communicates modbus with a relay io board. There should be constant uninterrupted communication between the two devices and that is working until I open the data logging form2 and import data from a large sequential text file. While I am parsing data, the timer from form1 stops communicating with the modbus device. Once the data is done, the timer of form1 resumes communication with the modbus device. Is there some other method I could use to make sure the modbus communication is never interrupted.? Is there a command I can periodically run from form2 while the data is being parsed that will keep the timer on form1running?
View 2 Repliesiam very new to vb.net programming, can any one help me in opening a dwg file in vb.net,
View 2 RepliesMy program performs a search on a specific directory and returns a list of files with specific criteria. When the user selects a file name in the list box and Clicks the button, I want the program to open that file and print it. I have two functions - one store the file path in a text box and the other gives me an option to select the printer. have no idea how to open the file using that path and how to get it print.If i specify the hard code the a specific file path, it currently can open all files except a .dwg file. For a .dwg file, my program opens auto-cad and crashes?
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
For Each file In LstSelected.Items
[code].....
im wondering if it is possible to open an attached file to a database record. for example in EmployeeID 000 i have a MSWord attachment. the user can open this msword file through the VB6 program. all i have saved in the database is the location of the attachment but the user cannot view this attachment.
View 1 RepliesI've created my code to open files, and manipulate anything I need in a text environment but I cannot find how to open a already zipped file. I am using 2008.
View 2 RepliesI am using OLEDb to read .txt file database, it works most of the time here is my slect statement:
[code]...
I have copied and pasted wordpad.exe into c:windowssystem32wordpad.exe So that whenever i will type "wordpad.exe" on command prompt;;;; It will obviously run wordpad from command prompt.when i opens CMD and types--------
C:Documents and SettingsAdministrator>wordpad "C:Documents and SettingsAdministratorDesktopapr_26_2010_eveapr_26_2010_eveDATAhelp.rtf"
It opens help.rtf file with wordpad.Everything is ok ....BUT....From a vb.net 2003 project its not working.......
Dim cwd As String = System.IO.Directory.GetCurrentDirectory
Dim slash As Integer = cwd.LastIndexOf("")
cwd = cwd.Substring(0, slash + 1)
[code]....
BUt it is not running the wordpad with that help file....Would you like to give any hints for..... displaying that file from cmd using the same code.
Is there a way to delay the start of a text file? I am using this to call the TXT file after clicking a button: (opens txt file)Process.Start("text.txt")I was wondering if there was a command to delay the TXT file from opening for a number of seconds?
View 2 RepliesMy application generates XLSX files based on a users requirements.
After the XLSX file is generated the user is redirected to where the file is saved using Response.Redirect...
Response.Redirect("filename.xlsx")
When the user then opens the file... they recieve this message.
The file you are trying to open, 'filename.xls', is in a different format than specified by the file extension. Verify that the file is not corrupted and is from a trusted source before opening the file. Do you want to open the file now?
As a temporary fix I've instructed my users to press "Yes" when they receive this message and the file opens perfectly fine.
Does anyone have any ideas why IE6 is trying to open an XLSX file as an XLS?
I am developing an Excel workbook at work and I've got a problem. I'd like to save information entered in the workbook and save it in another one (called List, for example purposes), using a macro. The problem is that the file in which I want to save the information is located on a server. When people open List.xls, it's Read Only. So, when my macro executes, it opens a Read Only workbook...I'd like to do "Open As", just like you could do by right-clicking on any file in Windows XP. The result would be that the macro would log on as administrator only to open List.xls, write in it and save it under the same name.
View 3 RepliesI have created a .wsf file which on opening executes some functionality. I need to open this file in vb for my project to work, but i don't know how to do this.
View 2 RepliesI want my Button1 to open a .docx file in Microsoft Word when clicked. I tried some shell stuff that was suggested elsewhere, but it didn't seem to work.
View 1 RepliesI am trying to make a tabbed notepad in vb.netWhat I want to do is associate .txt, .rtf, .html, ect. so that when you double click on them, the notepad starts up and loads the text file in one of the tabs. So far I can only get the files to open by using an openfiledialouge
View 7 RepliesBasically im designing a programme where someone can put their information in, save it, and then I can access their information by clicking on their name in a list box.For example, they type in their name and number, when i open another form, their names come up an a list box, click on their name, and another form appears with their name and number in it.
View 1 RepliesSo far I have this for my opening-
Dim alltext As String = "", lineoftext As String = ""
If OpenFileDialog1.FileName <> "" Then
End If
[Code]....
it doesn't work but isn't that where is should be? Also I get this error when it trys to load- QuoteA first chance exception of type 'System.IO.FileNotFoundException' occurred in Microsoft.VisualBasic.dll However the program does continue to load and the file I want to have it open is in the directory.
know the source code format when i want to open a video file in vb.net?
View 7 RepliesMy company is currently using a Linux/Powerterm program that exports reports via email on a daily basis. I have a add-in program installed on outlook to automatically save the report to a folder on the server. The file that is exported appears to be an XLS 97-2003 Worksheet, but I confirmed from the original programmer that this file is not a true Excel file, I believe it is a unicode file, but it can be opened by Excel. I want to link these files to an Access database within my form, but Access does not recognize this file format.I attempted to create several programs in Studio to convert the file to an XLSX file, but on each attempt I receive an error the file is an in unrecognizable format which is killing me at the moment. I even made attempts to dump the data to an dgv but it still wont be accepted.
View 2 Replieshow to start a program i want to start a application from here
C:Program Filesadobe master coll and start the exe within that folder im sure it used to have process start just cant remember how to add the dir to a certain folder to get it.
I have the following code:
Dim rtfMain As New Windows.Forms.RichTextBox
Dim sRTFFilename As String = m_sProjectFolder & m_sERI_RTF_Filename
rtfMain.LoadFile(sRTFFilename)
I need to allow the user of the form to select the directory of a .exe and then press open which will then obviously open the .exeCan anybody please tell me how to allow the user to choose their own directory and then open the file with the name that I choose.for example:They choose the path: C:program filesexampleWhen they press open, the file: filename.exe is opened.Would I be able to write the settings to a .ini file so that they do not need to select the path every time they use the program?
View 1 Replies