"PInvoke Restriction: Cannot Return Variants"
Jun 24, 2011Public Structure WSADATA
Dim wversion As Integer
Dim wHighVersion As Integer
[Code].....
Code above give me this error
"PInvoke restriction: cannot return variants"
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Reading String From Process - Cannot Return Variants
Aug 19, 2010I have the code below (found on forums) that should read the string "34,56,23,74,69" starting from the first address of another process till the end. However when I start the project I receive this error :"PInvoke restriction: cannot return variants." With Search Engine for example, the string is found, displayed and changed without any problems. Right now I have a subroutine that searches the string but only if I put the right memory address, and unfortunately the address changes almost every day.
Imports VB = Microsoft.VisualBasic
Imports System.Runtime.InteropServices
Public Class Form1
Inherits System.Windows.Forms.Form
[Code] .....
Make The Web Browser Have Restriction?
Mar 12, 2011I have a internet option built into my application, it has three options Unrestricted, low restricton, and secured with red, yellow, and green, I have a trac bar, i want to know how I can make the web browser respond to the trac bar when one of the ticks is selected, for example when the restricted option is selected, the web brower wont display anything that is x-rated.
View 3 RepliesHow To Impose Special Character Restriction
Jul 22, 2010I am developing a small application that need user authentication. How can I impose special character restriction. I mean how can I ask the user to enter at least 1 special character to make the password strong.I use VB.Net 2005.
View 2 RepliesRestriction Error On Messages Between SQLSERVER And Dot.net?
May 28, 2009I tried to run this on a local instance of sql-server and sadly it worked!!!now I know that the code is right and there is some kind of DBA restriction I need to find (and ask the DBA to remove)
using System;
using System.Collections.Generic;
using System.Text;
[code].....
User Login Time Restriction?
Jan 1, 2012I have shifts in my application. I want to restrict the time that a user can log in to their defined log in time span. Shift 1 which is AM to PM is working fine, but PM to AM check is creating problems. This is because the second shift starts at 5.00 PM and ends on next day on 10.00am.
The user table structure is
shiftid, starttime, endtime
1, 6:00:00 AM, 11:30:00 PM
2, 5:00:00 PM, 10:00:00 AM
VS 2010 Program Run Restriction Tool?
Oct 13, 2010I am having a hard time dealing with this project. I wish to make a program that will be able to restrict programs to run. For example:Since we all know that the gpedit.msc has this ability. Which will add a new subkey under HKCUSoftwareMicrosoftWindowsCurrentversionPoliciesexplorer with a new subkey DisallowRun, and a DWORD value at the Explorer key will be added DisallowRun.If I click the Button1, the text in the Textbox1 will add a String Value to the key above.
View 4 RepliesPInvoke - .net 4 Vs 3.5 ?
Dec 16, 2010I'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.
Deployment :: In Windows Vista/7 There Are Some Restriction On Folder Viewing
Jun 1, 2009I have nerver used my application in windows vista or windows 7.It turns that WinXp SP 2 supports great but when i run it in windows 7 , it shows error like this but I can't install MDAC28 in windows 7 Because it is for windows 9x.Isn't vista/7 contain JetOledb components?.I have some other questions too in windows vista/7 there are some restriction on folder viewing .. In few of application , I used to save some info in system32 folder now those applications are also working.How we can save infos in windows 7 at system directory?
View 19 RepliesRestriction / Boundaries - Change Color (to Red) When It Touches The Picbox
Nov 18, 2008i've drawn two boxes (one with spotcolour color of orange) in a picture box. box a stays fixed at the bottom and box b can move. i've restricted box not move outside the picbox, but it needs to change color (to red) when it touches the picbox, and i've tried can't seem to do it. boxb also can't overlap boxa.
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VS 2008 Does Adapter.fill Have A Query Length Restriction
Apr 10, 2010I have a database with around 100 columns and when i go:
[Code]...
The code works fine with a smaller database, so i was just wondering the problem is that the database is too big and the adapter isn't able to handle such a long query. I was just wondering if anyone knows what kind of limits there are?
C++ - Pinvoke Using Structs In Call
May 3, 2011I'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]...
LINQ Left Outer Join W/ Date Range Restriction On Right Table?
Feb 4, 2011I have two tables, a LP_task table and an lp_Update table. I want a complete list of tasks and only updates that were posted during a specific date range. LINQ doesn't seem to support any other join criteria but 'equals'or each task. I want all tasks (left table) even if they don't have an update. (Left Outer Join)
Dim TasksData = (From t In db.LP_Tasks _
Group Join up In db.LP_Updates On t.ID Equals up.TaskID Into upds = Group _
From u In upds.DefaultIfEmpty _
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Pinvoke - .NET - Calling Kernel32.DLL's Wow64DisableWow64FsRedirection?
Oct 13, 2010Looking 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?
VS 2010 PInvoke Stack Imbalance?
Aug 26, 2011I 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
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Change Pinvoke SHFileOperation Root Directory?
Aug 13, 2011I 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]....
DB/Reporting :: Can't Find PInvoke DLL 'SQLite.Interop.060.DLL'
Jan 19, 2009I 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.
Enable 'ReaderMode' In .Net Control PInvoke DoReaderMode API
Jun 7, 2011I 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?
View 1 RepliesUsing PInvoke To Access Some Routines From A Third Party Library?
Sep 9, 2009I'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]...
VS 2010 PInvoke Stack Imbalance Calling C++ DLL?
Aug 30, 2010I'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.
Call A Routine In Kernel Mode Besides Using Pinvoke Which Is Slow?
Mar 29, 2012I 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?
View 1 RepliesError: A Call To PInvoke Function Has Unbalanced The Stack
Dec 15, 2010i 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.".
A Call To PInvoke Function 'WebCam!WindowsApplication1.WebCamMainForm::SendMessage' Has Unbalanced The Stack
Nov 6, 2010I 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]....
Generic Restriction - Dont Select The Key Bytes And The Block Bytes From The Numeric Up/down?
Sep 16, 2011Ok i am having some issues designing a base-class to handle generics.Caveat is i need to restrict the type put in as a Numeric type, specifically Int16, Int32, or Int64 (Short or Long).I know you can do Of T as {Structure} but i dont want to select the key bytes and the block bytes from the numeric up/down.
View 2 RepliesError - Call To PInvoke Function 'WindowsApplication1!WindowsApplication1.Form1::GetCursorPos'
Aug 24, 2010I'm getting the following error:A call to PInvoke function 'WindowsApplication1!WindowsApplication1.Form1::GetCursorPos' 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.
[Code]...
Load DLL Error - "This Is Likely Because The Managed PInvoke Signature Does Not Match"
Sep 7, 2009i got error stated :"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."when i tried to run function from a dll file. I searched many forum but can't get a suitable solution. urgent help needed.
here is my
Public Declare Function CXCMD_LoadCard Lib "PCP02CT.DLL" (ByVal iSlot As Integer, ByVal iID As Integer, ByVal iDest As Long, ByVal bflip As Long, ByVal blmmed As Long) As Integer
[code]...
[VB 2010] Return Alert Message If SQL Query Return No Records
Dec 12, 2011I use this code to return records in a DataGridView:
[Code]....
Return An Object As The Return Value Through A RealProxy Transparent Proxy?
Oct 7, 2010I'm working up a system where I plan on using RealProxy objects to enable intercepting method calls against a set of objects, handling the call, and then returning appropriate results. This works just find for simple return types like strings or ints, but I can't seem to return objects from the RealProxy.Invoke method. Everything works. I get no errors, but the returned value is always NOTHING, instead of an object.
I've worked up the smallest sample code I could, and have included it below. Essentially, just call RPtest and single step through. The code creates a simple object, RPTestA, with a string field and an object valued field It then retrieves the string
[Code]...
Can't Find PInvoke DLL "dbnetlib.dll"?
Apr 15, 2009im using vb.net windows mobile 5.0 and im trying to make a application and when i try to connect it to the SQL server 2000 i encounter this error Can't Find PInvoke DLL "dbnetlib.dll"
sample code:
import system.data
import system.data.sqlclient
[code].....
GetAnsyKey Error "PInvoke Signature Does Not Match The Unmanaged Target Signature"
Jul 11, 2010I was trying to use a GetAsyncKeyState code but each time I run the program an error occers where
[Code]....
'A call to PInvoke function 'WindowsApplication1!WindowsApplication1.Form1::GetAsyncKeyState' 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.' The full code is in timer with (1) time interval
[Code]...