VS 2010 PInvoke Stack Imbalance Calling C++ DLL?
Aug 30, 2010
I've got a dll, written in C++ (which I have the source code for and have compiled it under VS2010)It has a function I want to call in VB
SHARED_FUNCTION int yasdiMasterInitialize(const char * iniFile,DWORD * pDriverNum );
I've declared it as follows:
<DllImport("yasdimaster.dll")> Public Function yasdiMasterInitialize(ByRef IniFile As String, ByRef DriverNum As UInt32) As Integer
End Function
as when I try and use it as follows I get a pInvoke error:
Console.WriteLine("Initialise:" & yasdiMasterInitialize("yasd.ini", Drivers))
From reading around this is something to do with the declaration but I don't know what to change as this is the first time I've tried calling a DLL.
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Aug 26, 2011
I have just upgraded(!) to VS2010, and opened my project from VS2008, which worked, and when i try to run i get a Pinvoke error due to stack imbalance. I am completely lost, on this error. What do i need to do to solve it. The error occurs at the If GetAsyncKeyState(8) Then part of the code below. It is detecting for a backspace being pressed. Private Declare Function GetAsyncKeyState Lib "user32" (ByVal vKey As Long) As Integer
[Code]...
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Dec 15, 2010
i have an error when im using a function in dll. i declare this( "Private Declare Function SetChannel Lib "StreamReader.dll" (ByVal freq As Long, ByVal smyb As Long, ByVal pol As Long, ByVal fec As Long, ByVal lof1 As Long, ByVal lof2 As Long, ByVal lofsw As Long) As Boolean") [Code]
this is that error"A call to PInvoke function 'skynet!WindowsApplication1.Form1::SetChannel' has unbalanced the stack. This is likely because the managed PInvoke signature does not match the unmanaged target signature. Check that the calling convention and parameters of the PInvoke signature match the target unmanaged signature.".
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Nov 6, 2010
I have created a webcam application in vb2010, when I run the app I get a run time error, please see below PInvokeStackImbalance was detected Message: A call to PInvoke function 'WebCam!WindowsApplication1.WebCamMainForm::SendMessage' has unbalanced the stack. This is likely because the managed PInvoke signature does not match the unmanaged target signature. Check that the calling convention and parameters of the PInvoke signature match the target unmanaged signature.
it is coming up on this block of code'This sub will open the preview window
Private Sub OpenPrewiewWindow()
Dim iHeight As Integer = WebCamPictureBox.Height
Dim iWidth As Integer = WebCamPictureBox.Width
[code]....
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Oct 13, 2010
Looking at Microsoft's page on Wow64DisableWow64FsRedirection, I see some C code. What if you want to call this function and it's revert from VB.net? So far I have done this:
<Runtime.InteropServices.DllImport("KERNEL32.DLL", EntryPoint:="Wow64DisableWow64FsRedirection")> _
Public Shared Function DisableWow64Redirection() As Boolean
End Function
And I do likewise for the Revert brother function.This seems to work, as the shell command I call after actually finds its exe in system32, but I am not sure about the Revert, does it need a parameter? This Revert page seems to want me to take the output from disable and plug it into the revert call. Does that sound right? How do I change my DLLimport to take in a boolean and actually use it in the Kernal32.DLL function?
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Jan 30, 2011
I'm writing a program that solves sudoku puzzles, but it keeps giving me StackOverflowException. I've tried to make it as efficient as possible, and cleaned up my code, but it still does this once it reaches a certain depth of recursion. how I can increase the stack size so that it can handle this recursion?
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Jan 12, 2011
Now I see that VB tells me that label arrays are no longer supported But I also see that VB2010 is providing the relevant logic to update each of the label array fields I was until today using VB2008, because after running this application it crashes with a report of stack overflow, I assume it is related to the label arrays, but have no idea. So I have upgraded to VB2010.
In VB2010, I note that the immediate window is reporting A first chance exception of type 'System.InvalidCastException' occurred in Microsoft.VisualBasic.dll Now I have used label arrays for showing columns of like data, generated by a for loop. What should I be using it its place, maybe a grid..
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Dec 16, 2010
I've an issue regarding p/invoke from managed to unmanaged code. See my original post at the MSDN forum (as brief summary is seen later in this post). Before I go on, I just want to explain a couple of things: I have a wrapper assembly in net 3.5 that does the actual interop to the unmanaged code. Then I have my console "host app" which uses the wrapper assembly. The solution I came up (I refer to my MSDN post) works when the host app is using .net 4, but it doesn't work when changing the host app to use .net 3.5. When changing, I get a AccessViolationException.
host app: 4.0, wrapper assembly: 3.5
-> works
host app: 3.5, wrapper assembly: 3.5 -> throws
AccessViolationException
Do anyone have a clue to why I get an AccessViolationException? Most importantly, how do I get it working with .net 3.5?
Brief summary on the MSDN post I refered to. I have this messy p/Invoke I need to solve. The C declaration looks like this:
long TBAPI TbeAndring (short,
short,
PTB_PU,
PTB_ANDRING_INFO,
PTB_PARAMS,
[CODE]...
Where PTB means that each argument is a struct pointer to an array of arbitrary length. The structs mostly contains strings, doubles, char and short. Anyway, I ended up with this DllImport statement:
<DllImport(NativeLibraryName, CallingConvention:=CallingConvention.StdCall, CharSet:=CharSet.Ansi, SetLastError:=True)>
Public Shared Function TbeAndring(ByVal sAntMoment As Short, _
ByVal sAntPU As Short, _
[CODE]...
As you see some of the arguments are changed by the unmanaged code as well.
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Dec 16, 2011
I created a class that I use for error logging. I have one method that accepts a parameter as an exception. With that exception, I created the error log and I write the message as well as the stack trace. With this, I'm finding that I'm not always getting detailed information. Usually, the stack trace shows me line number in which the error occurs, which allows me to pinpoint the issue.
[Code]...
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May 3, 2011
I'm really struggling with the following pinvoke call. I've tried numerous different ways of doing this but still no joy. The call runs through, but I get a 'Bad parameter' message back with suggests there is something wrong with the struct, since I've ran through a c++ example of this code and the parameters are all correct.
[Code]...
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Aug 13, 2011
I want to delete, copy, move, and rename files using the actual Windows confirmation dialogs.I am using SHFileOperation. My problem is, that, when I want to move a folder with this path:
"C:MyFolderToMove"
And I set the destination to:
"C:UsersTest"
And (THIS PART IS IMPORTANT) the APPLICATION start from say
"D:MyApp.exe"
[code]....
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Jan 19, 2009
I am running Visual Studio 2005 (I tried 2008 and got the same error) using SQLite for a device project. (Windows 6 Mobile)The identical code works perfectly for Windows, but when I execute
f.FileName = PathForDB
SQLconnect.ConnectionString = "Data Source=" & f.FileName & ";"
SQLconnect.Open()
I get the above message. I have tried to "manually" load the DLL at the beginning of my code, but I still get the same message.
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Jun 7, 2011
I want to enable the 'ReaderMode' for paning/scrolling my control in .Net. Closest thing I found was this Win API function .url....However, I'm not sure how to call this one, in the documentation it says, This function is not declared in any public header. To use it, you must access it as ordinal 383 from Comctl32.dll.I've never called a function that didn't have a name before, can anyone describe how to do this in VB.Net?
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Sep 9, 2009
I'm using PInvoke to access some routines from a third party library, however i'm getting SEHExceptions when trying to use callbacks defined for one particular method. The callbacks are used to provide feedback from other unmanaged methods within the third party library, passing a string back to the calling application containing a status message.
[Code]...
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Mar 29, 2012
I have a problem listing directory information in a process I wrote to call directory listing of the $MFT routine.The gang has convinced me that the problem is that I'm not calling the routine in Kernel Mode.How does one call a routine in Kernel Mode besides using pinvoke which is slow...."MODERN PROGRAMMING is deficient in elementary ways BECAUSE of problems INTRODUCED by MODERN PROGRAMMING." Me?
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Feb 5, 2011
I have an application written in 2005 using VB Express. It uses a DLL from a supplier who is now defunct, so I have no idea what language it was written in.I have moved to a new machine running Windows 7 (64-bit) and installed the DLL on it OK (it installed into the x86 folder, so I assume it's 32-bit). The sample program supplied with it runs OK, so I know that it works. However, the application's .exe file which I copied over fails with an error message saying "cannot create ActiveX component".The offending line of the program is:
objCDDeviceManager = CreateObject("CDTextReader.CDDeviceManager")
CDTextReader is the name of the DLL.I've downloaded VB Express 2010, but when I build the program using it the same thing happens.how I can get it to work? I've tried compiling it for 32-bit but get the same result.
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Mar 12, 2011
If I have two classes, one and two:
Public Class One
End Class
Public Class Two
[Code].....
Is there any way that a sub in class one can call the sub in class two?
In other words, I have a main class that instantiates objects from other classes, but I want one of those other classes to be able to 'talk back' to the main class without being polled.
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Oct 6, 2010
Can someone please show me how to call this API function?
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Jun 5, 2012
I have a MDIParent Form named "frm_discipulus.vb" which opens a MDIChild Form named "frm_gestionare_cursanti.vb"
Private Sub tsm_cursanti_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles tsm_cursanti.Click
Me.Cursor = Cursors.WaitCursor
Dim frm_mdi_gestionare_cursanti As New frm_gestionare_cursanti
frm_mdi_gestionare_cursanti.MdiParent = Me
[code].....
I have tried to call the "Public Sub frm_gestionare_cursanti()" by using the code
frm_gestionare_cursanti.afisare_note_obtinute()
And nothing hapends.Why ?What should i do to refresh the DGV on MDIChild?
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Jul 18, 2012
essentially I need to create a class that houses the methods and then call the methods in the form but I can't seem to find out what the right code is to call it. I think there may be an issue with the conversion from a double to a string.
This is what I have for the Class
Public Class Aircraft
Dim Names() As String = {"A-747", "A-737", "C-150", "D-240"}
Dim TakeOffVelocity() As Double = {250, 264, 270, 240}
Dim Acceleration() As Double = {33.5, 44.2, 37.1, 51.9}
[code]...
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Sep 11, 2010
I have create a small routine to Generate Tabpages on a tabcontrol, and on each tabpage I have Created a label and a combobox, my problem is that since Im generating them in the code and the name of the two controls change based on an index.. ie. Combobox.name = "cmb" + Index I need to be able to retrieve the selected item from this combobox in order to move on to my next routine.. but I do not know how to reference these comboboxs since there is no pre or defined named for them.
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Aug 26, 2011
I'm having trouble on calling a public sub on another form. Here is the sub:
Public Sub BOTAO_NUMERICO(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles N0.Click, N1.Click, N2.Click, N3.Click, N4.Click, N5.Click, N6.Click, N7.Click, N8.Click, N9.Click
Dim Res_ant As String
Dim Res_atu As Double
If (Res <> 0) Then
[Code] .....
On form Normal, BOTAO_NUMERICO works fine, but on Cientifica it don't.
OBS: All objects on both forms are the same, with same name.
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Jun 9, 2011
I'm currently having issues calling a .ps1 file in my vb.net project. The program is supposed to provide a simple way for end users to unlock Active Directory accounts. The vb.net project is simply a text box with a button. Users will type the username of the locked account. When the button is pressed, the program writes whatever is in the text box into a CSV file. The CSV file has a samAccountName column in it. After the file is written to, the program then calls a Powershell script that reads the CSV file and unlocks the account based upon what is in the file.The program does everything it is supposed to except for calling the Powershell script to actually unlock the account. I've tried a Process.Start(filePath) which would open the file, but opened in notepad and didn't execute anything. Right now the program is calling a batch file which is supposed to run the script in Powershell but that attempt also failed.
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Feb 3, 2011
So the reason i'm creating this tread is this, i'm programming a app that display the cafeteria opening time and closing time at my school. This program is running as a system tray app which on mouse-on display the opening/cosing time at the tray, also other features but thats not important at this point.
I'm getting the wrong output, a random value from my "regnestykke", at my tray.
My code is this:
vb.net
Public Sub New()
'Opbygning af menuen
[Code]....
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Aug 25, 2010
I am pretty well a novice to Visual Basic 2010 and am trying out the VB2010 express edition. I not the the coding syntax for VB2010 is different from VB6. I'd like well documented code for opening Excel, creating/opening a Workbook, reading and writing data and closing Excel Workbook when I exit the VB2010 form.
I am developing a VB2010 application form which I'd like to work dynamically with an existing MS 2003 Excel spreadsheet that will be provided with the application . The VB2010 form provides some data input for cells in a worksheet (named "Fuels") in an existing Excel Workbook called "carbonfootprinter.xls". Based on the input data, calculations are performed and the corresponding results are output to other cells in the same "Fuels" worksheet. The results are then also graphed in the Excel Workbook. When the application form loads, I'd like VB2010 code that checks if the "carbonfootprinter.xls" exists and is open, if not then it should be opened to receive data input from the VB2010 form and to perform calculations,and finally the VB 2010 application should close the Excel spreadsheet
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Jan 15, 2011
In a program of mine, I have a resource (which is a textfile). This contains also vb.net code, It is resource which is binded to an .exe, with the mainprogram that I have. So the main program calls the resource, and the resource bind to an exe file.
I have this line:
Declare Function GetProcAddress Lib "kernel32" (ByVal handle As IntPtr, ByVal name As String) As IntPtr
In the source.txt and I want to replace this whole line by a string(or word) which calls this line from somewhere else. For example in another source.txt. A textbox is not possible because this is not a vb form, but a .txt-file. Maybe I can create another resource, which IS a vb.net form, call it or something? In this case. I can create a textbox with this line that I gave above, And I can use it by: textbox1.text.
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Jul 6, 2010
In the exam paper, student have to check the checkboxes [usercontrol does not work] whether the question is correct or wrong.Now as I have hundreds of questions, I cannot write the same code again and again with the IF conditions, is there anyway to make it a function or something then call it whenever is needed.As well as I wanted the marks to be added when a student submits the paper.
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Feb 20, 2012
A thread listens for incoming information from a server will add the received string to a custom control (containing a textbox and a listbox, I've called it console). This requires an invoke so I used the following
Dim InvWriteCons As Console = Gary.ChatCons
Dim INvWriteText As String = "DEFAULT"
Public Sub InvWrite(ByVal cons As Console, ByVal message As String)
[code].....
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Mar 30, 2012
I created a STRING SEARCH function in C/C++ - and I'm trying to use it in a multi-threaded situation in VB. I started this problem in a thread in the C/C++ section of the forum - here [URL] my last post shows me getting this error trying to call the function. Ran the code - got to that point - and in the immediate window I did
[Code]...
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Oct 8, 2010
I am wondering if it is possible to call an application, say "notepad.exe" (among other application's that are already open) and setting focus on the same, so the user can readily start working on it.
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