Is it possible to start another EXE in Managed Code? At this time, all I can do is use:
System.Diagnostics.Process.Start(exeName)
Is there another way to call another EXE within the same project?
I have a .Net application (VB in particular, although I would this to be as language agnostic as possible) that uses a COM object (made in C++). I need to implement a event in COM that passes a char array from C++ to .Net. I guess I need to convert the array to a managed array; How can I do this?
View 2 RepliesI am trying to develop a dll in VisualStudio2005 in vb.net that will communicate with a spectrometer attached to the USB port of the computer.Now the dll exists in C++ and it works like a charm. It is unmanaged code.Now if I try to translate this code in VB.net (because our app is in VB and my boss wants it in VB for maintainability) I have problems.
First of all, I am trying to create a file to open that port. The code in C++ looks like below and it works. Needles to say I tried to call the C++ dll from our app and it works. If I call the vb dll it doesn't. It gives me "access denied" no matter what I tried. I am not sure if my CreateFile is wrong or it's .net. I read somewhere that I need a manifest file included in the dll? Has anyone experience something like this? Why would i get "ACCESS DENIED" all the time?
// close and clear current stuff
ClosePort();
swprintf( sDevice, L"\\?\usb#vid_0765&pid_%s#******#{%s}", Device, PRIVATE_IID_STR );
[code].....
I need to write a DLL in C that is used a plugin for an existing application.The DLL has to be compiled by the Visual Studio 2008 compiler with the following options.[code]It's then linked to applications library's.What it actually needs to do and what's causing me the issues is that within one of the methods it needs to pull data from a sql server 2008 r2. From what I've seen today you wouldn't be able to do this directly in C as SQL Server past 2005 is designed to communicate with CLR languages( C#, C++, VB.Net).It was suggested that I handle all the database communication with a VB.Net dll and then call said function from within the C dll. Most of what I've found on the topic of calling managed dll's from unmanaged code has talked about pinvoke or com wrappers and mainly from the perspective of c++.
View 2 RepliesHow to identify the x64 or x86 of the OS and a Process in managed code?
View 1 RepliesI am having a problem marshaling data between managed and unmanaged code. So I need to inspect the data at the byte level. What I need to do is store a number, say 8 into a 4-byte integer then copy it to an array bytArray(4) and compare those bytes with other data. I also need to set up the same array and copy it to an integer variable.
View 2 Repliesi am using directx in my form but my program cant load managed direct(i instal Microsoft SDK V 9.29.1962.0) AND SHOW THIS ERROR:
Unhandled exception has occurred in your application. If you click Continue, the application will ignore this error and attempt to continue. If you click Quit, the application will close immediately.Mixed mode assembly is built against version V1.1.4322" of the runtime and cannot be loaded in the 4.0 runtime without additional configuration information.
figure out a way to link datagridviews to other controls like a combobox, list view or even another datagridviewBecause much of the code is managed by the IDE, I was expecting an IDE approach to linking controls. Is this the case or do I have to modify the generated code to do what I want.An example would be to use a combobox to limit the number of entries in a datagridview etc
View 2 Replieshow to open a "data link properties" dialog using manged code
View 1 RepliesI have a program that runs some code when i click a button on a form when done running the application ends. I want to automaticaly run the code when the users clicks on the exe. I have put the code that i want to run in the startup forms load event but that doesn't start
View 2 RepliesI have made my application to start automaticly when windows start (registry ../currentversion/run/appname + path). In this mode the application start minimized and an little icon appear in the notification icon area. With this icon you can maximize the app or exit it.If you exit the app and start it again using the Menu (Start/programs etc) than the application start in minimized mode (and in this case I would like to have it in normal mode) because the setting autostart is still true.Is there a way you can detect when the application start when windows startup using the above registry or when people click on an icon in the programs menu (or desktop)?
View 2 RepliesFirst off I am so VB.NET green it's pitiful. I am a AutoCAD Manager and I need to start migrating my VBA code to VB.NET. That being said, I am very familar with VBA,and some asp.net, and trying to use that knowledge to self-train in .net. The trouble I'm having is communicating between the various objects in .net. That being said, here is the first of many issues.
Currently, I am working on a file processing program that checks a user selected folder for .dwg files. I'm attempting to use FolderBrowserDialog activated using a "Browse" button , and can't seem to, first get the dialog to show a folder structure from the FolderBrowserDialog object and second, get the initial dialog code to take the "SelectedPath" method. Error "SelectedPath is not a member of "folderbrowser"
I can post code, but I'm not sure what snippet would be the most informative of my problem.
I have a project with WPF 4/VB.net 2010. How do I begin a WPF storyboard named "ripple" from the vb.net code behind? It is in window resources.
View 1 RepliesIs there a way to execute a block of code once the form is opened? What is the event procedure required for this?
View 7 RepliesI have a combo box I am filling on form load.I am using "SelectedindexChanged" to detect changes in the index to run the code when the combobox is used.Unfortunately, it runs the code on start up as well.
View 5 RepliesI've just been forced (by hurricane Irene) to shift from XP and Access 2003 to Windows 7 and Access 2010 with no time for testing or evaluating changes.All our databases are still Access 2000 format.Our offices were flooded and our servers got moved around, though they're all still named the same things, and in many cases things are working exactly the same.However, I have a database that I can't connect to.It's an Access front end that links to tables in an SQL Server 2005 back end.When I start up this particular database the first thing it does is fail when running code that had been put in to set up ODBC connections when one didn't exist on the computer that was trying to access the data.[code]I didn't write this code.
View 6 RepliesI am back - I have my code - it is part of another main form for a child's desktop view. I have it in a console app that works great. My new form has 3 text boxes, and a start button - txtquestions, txtUserAnswer, txtResults and cmdStart - to start the game. I made some slight changes in the numbers, because I needed it for a younger child (6-7), and removed 1 case in the case select (a square root problem too much for a little one). I click on Start button, and it freezes up. I am in Debug, but do not get any kind of problems showing me a bad line of code.
Here is my code:
Public Shared Function Parse(ByVal txtUserAnswer As String, ByVal provider As IFormatProvider) As Integer
End Function
Private Sub cmdStart_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdStart.Click
Dim endprog As String = "YES" 'define the answer for not ending the game
[CODE]......................
I am not sure about the loops, but it doesn't just freeze up anymore, as in an endless loop. Now I am getting a stop at the first 'parse'. I actually followed the instructions in a VB 2008 book to do this, and in the help section of Visual Studio with the function and the parsing. But, that is where it stops - I know I had to convert the input into - at least I think I did. The text box for input is just that input. The user's answer is typically a number, except for at the end.
So I need to disable to start menu and have found a code on a website but it doesn't seem to work. Heres the
Dim TFlag As Boolean
Private Declare Function FindWindowEx Lib "user32" Alias "FindWindowExA" (byval hWnd1 as Long, byval hWnd2 as Long, byval lpsz1 asstring, byval lpsz2 asstring as Long
Private Declare Function EnableWindow Lib "user32" (ByVal hwnd As Long, ByVal fEnable As Long) As Long
[code]....
Edit: I'm creating a program for places like schools or library where the password for all users are the same. I already made the program go to full screen and always on top and have disabled the user from using taskbar but I can't stop the start menu from appearing.
I'm trying to familiarize myself with network programming, and what better place to start than designing an FTP client code library?So far I'm not doing very good. I'm trying to create a method which downloads a file from a remote server to a local file path. To do so, all the examples that I could find declare a byte array that serves as a data buffer. I completely understand the point of doing that, rather than reading and writing byte per byte, but I just can't get it to work. Whenever I set a buffer greater than 1 byte, the output is somehow corrupted (different checksums, media files won't play etc).[code]Because this code does work when I set the buffer size to 1, I feel like there's something going wrong with the byte order. But all of this code is synchronous, so how is that even possible.[code]
View 1 RepliesI want to start learning/using modules instead of integrating the code directly into the program. So, I tried to make an example. Basically, what I wanted the program to do, is I click button1 and it lists details about my computer. So, I added 7 labels to the form, and a button. Then, I added a module (Module1.vb)
[Code]...
What's the advantages of the above types of dll? Is there any other type?
View 1 RepliesI am writing classes in VB.Net (both managed). The main class "A" creates an instance of "B". Class "B" must call a method of Class "A". I need to know two things (syntax, etc...):
1. How does class "A" tell class "B" what method to call?
2. How does class "B" call the method?
The method must pass back an array of Shorts (in this particular example), either as a return value, or as a ByRef argument.I don't want to use an event if I don't have to. The execution is timing critical. (I assume event handling involves a lot of overhead by the operating system, but I may be wrong.)
I have absolutely no background on programming in C (or any other unmanaged languages for that matter) yet I would like to use the GetBestInterface function from the IP Helper API in my .NET application. I tried to understand how P/invoke calls can be used to make calls to native methods, but there are many things that just don't make sense to me (like how types in managed code map to unmanaged types).
Is there an alternative function somewhere hidden in the System.Net namespace that does roughly the same thing? Or could I write my own alternative using existing base classes combined with some magic? Because that's basically what it seems to me: magic. There is no real explanation for how the method accomplishes what it does as far as I can tell...
I just discovered the LocalEndPoint property on the System.Net.Sockets.Socket class which I think could be quite useful in this. To my understanding it will do the best-interface-picking on my behalf and I'll just need to get the NIC that corresponds to the local endpoint.
I am having a very strange memory leak that seems related to databinding. It is very hard to reproduce, so I won't post any code here to do so, but will just describe the problem.We have data entry forms which have controls which bind to custom business objects through a BindingSource object.
View 7 RepliesIs there anyway to create an OS or Managed thread, so that it can never be interrupted. Thread/Process priorities are not enough.
View 2 RepliesVb.net For each currentFarm in ......
If urlQueue.Count > 0 Then
Debug.Assert(currentFarm.isBusy = False)
Debug.Assert(currentFarm.WebClient.IsBusy = False)
[CODE]...
The commented code won't work. That's because by the time the thread start, the variable currentFarm have changed. So I create a new function and cache the currentFarm in the function parameter. No there will be a cache of currentFarm address (object is always a pointer) on a stack and that address is the one being passed to the System.Threading.Thread constructor.
I have event Button that creates text box in run time.
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim textbox1 As New TextBox
static Dim shiftDown As Integer
static Dim counter As Integer
[code]....
All the text boxes that has been created displayed in GroupBox control dynamically. how GroupBox control size can be managed according to quantity controls inside it.
I am well aware that finalizers are typically used to control unmanaged resources. Under what circumstances may a finalizer deal with managed ones? My understanding is that presence in the finalizer queue will prevent any object, or objects strongly referenced thereby, from being collected, but it will not (of course) protect them from finalization. In the normal course of events, once an object is finalized it will be removed from the queue and any objects it references will no longer be protected from collection on the next GC pass. By the time a finalizer is called, the finalizers may have been called for any combination of objects referred to by the object; one cannot rely upon finalizers being called in any particular sequence, but the object references one holds should still be valid.
[Code]...
In My application, I have an MDI form. From MDI form I open all forms as child forms. I have implemented IDisposable for all large objects like file stream DB connection etc. In the Form_Disposed event I dispose all unmanaged objects. After the child form is closed, all unmanaged objects are disposed but managed objects (controls and form) are not disposed and still in memory. I find it from .Net Memory Profiler ([URL]).
So I have write code to remove all event handlers of all controls and form. Now, When form closed, dispose is called and all event handlers and controls are disposed, but controls and form are still in memory.
I am using a slightly modified version of this code. to create a mission critical application. That files that will be encrypted are very important. This has to be done from scratch because there are some other things that has to be done along with this. How secure is this? Its impossible to crack this encryption right? [Code]
View 2 Replies
