how to let VB check if a file exist on the server with the name provided before uploading that file.show a message and restart the application without uploading if a file exist with that name.
View 16 RepliesMy tables are PURCHASE and SALES...In PURCHASE table, fields are CODE(primary key), PRICE, DATE, TOTAL, QTY...when I'm entering datas in form and when i click submit, the datas stored... but when i enter same DATA(CODE), it is showing error...i don't want to show the DEFAULT ERROR message...so, i want to search whether the CODE is already in database or not...i.e When i click SUBMIT button, 1st it has to search whether the CODE is already PRESENT in table or not. if it is not there, DATAS have to be stored. otherwise, it has to DISPLAY MESSAGE BOX.
View 4 RepliesI'm a beginner in VB Express 2008 code. I would like to write a small program that only has a "Textbox" and a "Button" in VB Form..I would like a code that can check if a filename already exist in a folder.Let's say I have a folder that has all this filenames (eg. test.doc, eddy.doc, anything.doc)So if I entered 'eddy' in the "Textbox", and if I press the "Button", I would like the code to check whether 'eddy' is already exist in that folder.......
Same thing if I entered 'anything' in the "Textbox", and if I press the "Button", I would like the code to check whether 'anything' is already exist in that folder.
How to check if network adaptor is existing in pc or is not exist? (VB.NET sample)
View 3 RepliesI have Requests for VB(2005) very very important for my selly project!i need a button that determine if file exist and if that file exist then show a messagebox!and if not show messagebox!.
View 2 RepliesI have a program Which can get the frame's content, but if it is iframe I got error, normal frame with no problem, I need to detect the frame is iframe or normal frame.... but fail...
If WebBrowser1.Document IsNot Nothing Then
Dim element = WebBrowser1.Document.GetElementByTagName("iframe")
If element IsNot Nothing Then
checkiframe = True
[Code] .....
i have this code, how do i incorporate a progress bar into it? Private Sub btn_upload_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn_upload.Click
[code]...
Rather than using a Handler(.ashx), is it possible to use a web service(.asmx) to upload?
View 2 RepliesI try to find online any example for create an application autoupdate.
When I run my application it check in a webserver if exist new version,if exist the software run update.
I'm trying to upload a file via FTP from my local computer to an FTP server, which is also on my local computer at the moment. I've got this sub I'm calling:
Public Sub UploadFTPFile(ByVal ftpservername, ByVal fullfilepath, ByVal filename, ByVal username, ByVal password)Dim clsRequest As System.Net.FtpWebRequest = _
DirectCast(System.Net.WebRequest.Create("ftp://" & ftpservername & "/" & filename), System.Net.FtpWebRequest)
clsRequest.Credentials = New System.Net.NetworkCredential(username, password)
clsRequest.Method = System.Net.WebRequestMethods.Ftp.UploadFile
[Code]...
I'm running an FTP Server using Golder FTP Server, which is freeware. I think it's setup correctly because connecting to the FTP Server using the exact same string as above using Windows Explorer works great.
I feel quite silly posting this as I know my way around C++ decently and am writing an application in VB however I am getting quite frustrated with this problem.
Dim FileNo As Integer
FileNo = FreeFile()
Dim FILE_NAME As String = "C: est.txt"
[Code].....
When executing the above code it says at the FileOpen operation that the document does not exist or the relative path may not be right... I have looked in many place over the internet and even used the same examples from the Microsoft website however I get the same error.
I'm getting a suprising FileNotFoundException although i'm sure that the file exists.I simply wanted to add Logfiles(IO.FileInfo) as attachments to an email, therefore i tried to check the length of every file to detect if they must be added/zipped.This works fine if these files already exist. But if i've created them in this run, i get above exception when i try to check the length. It's oddly enough that i can write into these "not existing" files(actually FileInfo.Exists returns false) without a problem one line before.
Here is some code...
Creating one of the files in the constructor of a class named Log:
Me.LogFile = New IO.FileInfo(infoLogPath)
If Not LogFile.Exists() Then
'tried to use `Using` on the Stream but that doesn't change anything'
[code]....
how do i verify a file like a image or html exist on the web?
View 6 RepliesI have several photos stored in ~/image/ They are a01.jpg, a02.jpa...a09.jpg and so on. (some images maybe not exist) Also I have several controls their id name are image1, image2, ...image9 I want to make such function. If for example a05.jpg exist in ~/image/ then image5.imageurl= ~/image/a05.jpg otherwise image5.visible=false I use the following code, but it is failed, how can i solve it:
[Code]....
I've just recently started noticing this crash as my program has gotten more complicated. I have a few lines that look like this in my program:
Dim alines() = System.IO.File.ReadAllLines("C:deviceinfo.txt")
The problem that I am seeing is that my program is updating these files every second, so sometimes the files are being appended and or just being replaced as it is trying to run this line. Receive the error, "File is in use or does not exist." Is there anyway to put a line of code that tells the program that if the file does not exist to check again till the file does exist.
Sort of:
If System.IO.File.exists(cstr("C:deviceinfo.txt")) then
Dim alines() = System.IO.File.ReadAllLines("C:deviceinfo.txt")
else
loop
endif
Or I read somewhere that you can use:
If Len(Dir("C:deviceinfo.txt")) < 0 Then
or
If Dir("C:deviceinfo.txt") <> "" Then
Maybe:
Loop while Len(Dir("C:deviceinfo.txt")) < 0
else Dim alines() = System.IO.File.ReadAllLines("C:deviceinfo.txt")
next
I realize the danger of having a possible never ending loop in the program, but I cant think of another way to have the program wait for data and use the data immediately as it becomes available. I looked into having a wait() sub or to do system.threading, but my rational behind not using those are because waiting for 200 ms doesnt ensure that the data actually shows up, I could still receive the error.
How to make when they start the program if they dont have the file (config.ini) the program auto to create it , and how to make what to be put in the config.ini
like:
Config.ini:
// This is program for...
// site and other stuff
[Code]....
namespace of "system.runtime.caching" does not exist but in object explorer and microsof exist.i use microsoft visual studio 2010 and .net framework 4.0.i also cant use this name space(System.IO.MemoryMappedFiles & System.Runtime.Caching.MemoryCache)
any body know what is the problem. i want my program after doing something (opening a file or any thing that can do something my program use more memory.)use memory like startup run.
Here's my code:
Option Infer Off
Option Explicit On
Option Strict On
Public Class Form1
Public Sub NewToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles NewToolStripMenuItem.Click
[Code]...
I don't have a problem but I;m asking you something on the in VB.net.code. So in brief, this means that apart from 'Create', the 'Append' also create a file when it does not exist then?
View 8 RepliesEvery time I turn on my computer this little message box comes up. By simply clicking OK it goes away. Is there a problem and how can I get rid of it.
View 3 RepliesRight now I have a program that checks login credentials against my Access(2003) database.It works, but the problem I'm having is that it's checking if the file.exist to frequently and with no real pattern. How I'm doing it isI have a My.Setting that saves the file path string as well as the connection string, during form_load I check if the My.Setting path string exist, if not then use an openfiledialog to find the file. Right now I have the database in a public drive, which is why I think that my program thinks that the file doesn't exist sometimes. This is how I'm doing all of the above:
'Some global variables commented out
'Dim log As String = My.Settings.loginStr
'Dim logCon As String = My.Settings.loginCon
[code].....
Is there a way to check if certain file extensions exist within a directory?
View 2 RepliesI need to create an application that reads from a word file and when it find a string (datefor_example) it should link to it automatically example the string is : dd_mm_yyyy , when the application is reading the word file the minute it reads the sting it should go and see if the file with the string name exists if it exists it should link to it automatically.
View 1 RepliesWith 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 RepliesI want to test if a file exist and create it if necessary.Former I did it by testing folder and file then creating it.I want now to play with "try catch" exception handling, but it seems more heavy.I had to test the file twice..... Is there a cleaner way ?
Sub CheckLogFile()
Dim tempFolder$
'check MY_LOGFILE exist if not create it
[code]....
I want to create a program that verify if a file on my host exist.Example: I have a button and if i click on, it verify if exist http://myhost.ro/test/test.txtAnd then if exist, textbox1.text = "The file exist " else textbox1.text ="the file don't exist ".. Can I create this program ?
View 17 Repliesi need to send mail after taking screenshot. If i clicked the mail button first should check whether the file exist or not. Find the code below and tell me how to verify it.
Private Sub SendEmail_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles SendEmail.Click
Dim objOutlook As Object
[Code].....
I'm writing a SSIS 2005 script (vb.net)in which I want the functionality to checks if a file exists if so then delete it.For testing purposes I'm renaming files to replicate an exception i.e. file cannot be read for whatever circumstance,to ensure the error handling is correct.The code works fine and catches any errors with the File.Exists(errorLookUpLog File) command, if the file does not exist/cannot be read but not with the code below using System.IO.File.Delete(lookupErrorLogFile) as when file is renamed and therefore cannot be deleted (looking for the file under it's original name then no exception is shown (see full code below, have yet to try catching specific exception for if a files doesnt exist)[code]
View 2 Replieswhen people first run my program (as in the FIRST EVER time they run it), I want a window to popup (Form4). In this Form you have to locate a directory to a certain program (my program uses this program) and press OK, and then that will generate a .txt file with the directory to the program. (So that my program knows where that program is located.) Now, what I want it to do is when you open up the program, upon load (Form1), I want the program to check if that text file (directory.txt) exists. If it does and the path in the file is correct, the program will run fine. If the text file is missing and/or the directory doesn't exist, it will bring you back to Form4 (assuming that this is your first time running the program since the directory.txt file doesn't exist).
View 5 RepliesAnyone knows how to check if the file exist before downloading? I'm downloading the file(s) with the following
[Code]...