I'm not quite sure where to start with this. On right-clicking on a generic file in Windows Explorer (e.g. *.doc for a Word document) one can choose "Open with...". I 'd like to know how the program knows what file has been "passed" (is that the right word?). Is it done via arguments? How can I implement this in my own application?
I tried manually adding a file path to the arguments of one of my applications when it is run, but the path includes spaces (which denotes a new argument). How does Windows get round this/what do I need to do to solve this?
Regards,
Robbie
To retrieve the arguments used from the command line:
Private Sub Form1_Load(sender As Object, e As System.EventArgs) Handles Me.Load
Dim sMsg As String = ""
For Each sArg As String In My.Application.CommandLineArgs
sMsg &= sArg & ": "
Next
MsgBox(sMsg)
End Sub
Place the code in the WinForm _Load, Console Main, etc.
If the above was run with: Hello World as the command line Hello: World: would display.
Here is some VB code to open a file:
Case Keys.F4
Process.Start("H:\OIS\PROCEDUR\OIS8ProcedureManual.doc")
In this case Windows looks up .doc in the file types and uses the .doc entry to run Word and pass it the filename.
Process.Start has a second parameter that contains Arguments so you could provide a path to an .exe in the first param and the argument(s) in the second. Actually there are 5 signatures for Process.start. The most powerful ones uses the ProcessStartInfo class to provide you with the most control.
Post the code you wrote for the second group of questions if the above didn't help.
Related
I have done a simple VB application with this code:
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
Dim procName As String = Process.GetCurrentProcess().ProcessName
Dim processes As Process() = Process.GetProcessesByName(procName)
If processes.Length > 1 Then
Process.GetProcessesByName("keyinput")(0).Kill()
End If
End Sub
Public Sub type(ByVal int As Double, str As String)
For Each c As Char In str
SendKeys.Send(c)
System.Threading.Thread.Sleep(int * 1000)
Next
End Sub
Sub vai()
Dim line As String = ""
If File.Exists("trans.txt") Then
Using reader As New StreamReader("trans.txt")
Do While reader.Peek <> -1
line = reader.ReadLine()
type(0.155, line)
'SendKeys.Send(line)
SendKeys.Send("{ENTER}")
Loop
End Using
File.Delete("trans.txt")
End If
End Sub
Private Sub Timer1_Tick(sender As Object, e As EventArgs) Handles Timer1.Tick
vai()
End Sub
Basically the timer in it check if a file exists, read it and type the content simulating the keyboard.
I want this exe to start automatically when user login, it does it, apparently, I can see the form1 pop up but doesn't really works. Everyting is fine only if I run it manually by double-clicking the icon. Why and what can I do? Thanks
ps. i already tried to execute it with windows task manager, or putting a shortcut in the windows startup folder, or calling it from a cmd
EDIT:
when app starts automatically , process is running, but windows form is showing like this
Instead starting manually is showing like this:
I don't know this for a fact but I suspect that the issue is the fact that you are not specifying the location of the file. If you provide only the file name then it is assumed to be in the application's current directory. That current directory is often the folder that the EXE is in but it is not always and it can change. DO NOT rely on the current directory being any particular folder. ALWAYS specify the path of a file. If the file is in the program folder then specify that:
Dim filePath = Path.Combine(Application.StartupPath, "trans.txt")
If File.Exists(filePath) Then
Using reader As New StreamReader(filePath)
EDIT:
If you are running the application at startup by adding a shortcut to the user's Startup folder then, just like any other shortcut, you can set the working directory there. If you haven't set the then the current directory will not be the application folder and thus a file identified only by name will not be assumed to be in that folder.
If you are starting the app that way (which you should have told us in the question) then either set the working directory of the shortcut (which is years-old Windows functionality and nothing to do with VB.NET) or do as I already suggested and specify the full path when referring to the file in code. Better yet, do both. As I already said, DO NOT rely on the current directory being any particular folder, with this being a perfect example of why, but it still doesn't hurt to set the current directory anyway if you have the opportunity.
It was a Windows task scheduler fault, that for some reason didn't executed the exe correctly at logon. I've solved the issue by using Task Till Down and everything works fine now.
I writing a pair of programs in visual basics that will consist of a client and receiver. The client is completed making an output text file similar to below.
Dim FileName As String = "Text.txt"
Dim message As String
Dim file As System.IO.StreamWriter
'lblmessage.text says "Call MsgBox("Hello!", 0, "Version Beta 0.3")"
lblmessage.text = message
Dim Drive As String = "C:\hello world\" & FileName
file = My.Computer.FileSystem.OpenTextFileWriter(Drive, True)
file.WriteLine(message)
file.Close()
A sister program that is designed to be a reader will read the generated file.
The program will then take the text located in the selected file and use it as code in the readers programming.
Best example I can show...
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Dim fileReader As String
fileReader = My.Computer.FileSystem.ReadAllText("C:\hello world\Text.txt")
fileReader
End Sub
where "fileReader" is suppose to run the generated code from the previous program and use it as code it the Reader.
The point of this program is to create help tickets in the client and have a tool for reviewing these ticket in the same way they were submitted through the second app.
vba and vb.net is different. I'm not sure in which language your doing your stuff.
vba: use the ScriptControl.Eval command to execute a bunch of commands.
vb.net: it's a bit more code. you can use VBCodeProvider Class. s this SO Question: Load VB.net code from .txt file and execute it on fly using System.CodeDom.Compiler
UPDATE
I found a perfekt resource if you are interested in how to do it right and how it works in the background: http://www.codemag.com/article/0211081
I have searched a lot on this method but no way
I want my VB Program as once opened it gives user some messages using vbs script file
so once program is opened the vbs file saved in temp and be ran to say the message to user
i have used this code with the vbs file imported to Resources
but unfortunately it works only with one line script not script with many lines
Dim Variable As String = Environ("temp") & "Message.vbs"
If Not System.IO.File.Exists(Variable) Then
System.IO.File.WriteAllBytes(Variable, My.Resources.Message)
End If
Process.Start(Variable)
i have used this second code as well but it gives error in compilation because of Save
Dim Variable As String = Environ("temp") & "\Message.vbs"
IO.File.Delete(Variable)
My.Resources.Access.Save(Variable )
Shell("explorer" & Variable )
Please Help me with this code, i have spend a long time to get solution but nothing
Thanks in advance
I made some minor changes to your first example and created a simple vbs file. The first change is because a VB script file is a just a text file I added the resource as a text file and changed the WriteAllBytes statement to WriteAllText. Second, because WriteAllText, (and WriteAllBytes also), overwrite the file if it already exists I eliminated the If statement. You may still want that, in case you really do not want to overwrite the file. Finally, I added a backslash to the beginning of the filename to create the file in the temp folder. Otherwise you get drive:\temppath\tempMessage.vbs". This executed my simple script file just fine.
.NET code:
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Dim Variable As String = Environ("temp") & "\Message.vbs"
System.IO.File.WriteAllText(Variable, My.Resources.hello)
Process.Start(Variable)
End Sub
My VBScript file:
MsgBox "Hello World", 0,"Messagebox #1"
MsgBox "My name is Fred", 0,"Messagebox #2"
MsgBox "I have to go now", 0,"Messagebox #3"
I need to somehow download a ZIP file from the internet using Visual Basic.
Here's what I currently have:
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim NewAppData As String
NewAppData = Environment.ExpandEnvironmentVariables("%AppData%/.minecraft.zip")
Call DownloadFile("http://blahblahbacksheep.co.cc/.minecraft.zip", NewAppData)
End Sub
When I debug the program it gives me the following:
Function 'DownloadFile' doesn't return a value on all code paths. A null reference exception could occur at run time when the result is used.
What I'm looking to do is download the ZIP file and then extract it. And if possible, show label's with percentage for example:
Downloaded: 100%
Extracting: 35%....
Could anyone give me any resources or write up a bit of code to do some/all of this?
Thanks
For the unzipping part of your question: 7-Zip is a really great, open source, file archiving utility that has a nice command-line interface. Here's an example of how to call 7-Zip from VB (once it's been installed):
Set WshShell = VBA.CreateObject("WScript.Shell")
WshShell.Run "c:\Program Files\7-Zip\7z.exe " & _
"a -tzip myarchive.zip file.dat file2.txt file3.png", 1, True
This example compresses three files into an archive, while you want to extract files from an archive... just look up the appropriate command for that in the documentation.
Note that a command window will pop up while 7-Zip is executing, and in there you'll see a % progress indicator. If you want this indicator to appear somewhere else, then with a bit of ingenuity you can probably pipe the standard output through to some other relevant location.
I have the current code:
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim Bitmap As New Bitmap("image.png")
Dim ocr As tessnet2.Tesseract = New tessnet2.Tesseract()
ocr.SetVariable("tessedit_char_whitelit", "0123456789")
ocr.Init("c:\", "fra", False)
Dim result As List(Of tessnet2.Word) = ocr.DoOCR(Bitmap, Rectangle.Empty)
For Each word As tessnet2.Word In result
RichTextBox1.Text &= word.Text & "(" & word.Confidence & ") "
Next
End Sub
I just have a normal RichTextBox and a button on the form. I also have an image in the debug directory called "image.png".
Every time I run this, the program just closes. I did a step through and all of a sudden a file locater came up asking for "tessnet2.cpp"
I have a reference to the dll. I also don't know what the ocr.Init(...) line is for.
Any help would be nice!
First of all, thank you very much for your simple but effective code. After 3 days search I found this code for VB (not VC). Of course I copied and pasted it immediately and the same problem occured for me, too. Then:
I uninstalled Tesseract 3.xx
Checked RegEdit for Tesseract 3.xx and deleted them (whoever want to do this step; please be careful not to destroy anything)
Copied tessdll.dll in the same folder.
The main problem is:
ocr.Init("c:\", "fra", False) it should be something like this:
ocr.Init("c:\tessdata", "fra", False) in fact my real line is:
ocr.Init(Application.StartupPath & "\tessdata", "eng", False)
Noticed that in the folder "...\Visual Studio 2008\Projects...." I still had the same problem and then copied all folder in "D:\Test" folder (of course in this folder I have one more folder: tessdata)
It worked!!!
Hope it helps for you or anyone searching for this problem like me :)
Nes
If you put your code inside a Try/Catch block, you should be able to find out what the error is without your program closing. You could also debug the program instead of running it, and instead of the program crashing, the debugger will show you exactly where the error is happening.
The first parameter of Init method specifies the location of tessdata folder. If you have it at the default location, which is the same as that of Tesseract binary, it should be null, or Nothing in VB.NET.