.net - Attempted Union Structure Cause System.ExecutionEngineException?
Jun 13, 2011
I tried to experiment with the ability of .NET to support unions using the code below,but it causes a System. ExecutionengineException in .NET 2.0 and FatalExecutionEngineError in .NET 4.0 with the message:
The runtime has encountered a fatal error. The address of the error was at 0x738b3138, on thread 0x1080. The error code is 0xc0000005. This error may be a bug in the CLR or in the unsafe or non-verifiable portions of user code. Common sources of this bug
include user marshaling errors for COM-interop or PInvoke, which may corrupt the stack.I agree that this code should not work, but I didn't expect this kind of exception. Is this a .NET bug?
Class POLine
Public price As Decimal
Public VendorItem As String[code].....
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Feb 15, 2012
I'm developing on asp.net using infragistics controls.I have develop a web page where it uses heavy functionalities of the webdatagrid and it loaded very slowI have tested the page many times but somehow it started to fire this exception An unhandled exception of type 'System. ExecutionEngine Exception' occurred in mscorlib.dll Without displaying any source control.
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May 4, 2009
i am having the Visual basic code which is following..
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Feb 25, 2010
I just tried to run a project of mine that has a wpf control in it and i get the error:Exception of type 'System.ExecutionEngineException' was thrown.The error automatically closes after about 3 seconds When I create a new WPF project visual studio closes down - no error messages, also just closes with no errors if I create a form application and add a WPF control to it. Also compiled applications just bring up the "xxx has stoped working" error - even apps that are not mine such as Microsoft Pivot that use WPF?
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Nov 9, 2009
Dll libray with VC++
.h file
__declspec (dllexport) unsigned long QueryUser(const wchar_t* AccountName,
wchar_t FullUserName[100],
[code]....
an error : An unhandled exception of type 'System.ExecutionEngineException' occurred in TestLib.exe
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Sep 8, 2009
System.ExecutionEngineException was unhandled Message: An unhandled exception of type 'System.ExecutionEngineException' occurred in Unknown Module.There are no further details and the stack trace window is blank I was just wondering how it would be best to work out where this error message is happening - i really don't want to put a million debug.prints in there to work out what functions were last called etc.
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Aug 20, 2009
I receive random AccessViolationException on client machines. I have captured the exception text and have pasted it below. Unfortunately this error is not happening on code that I have written it appears to be happening when the .NET is trying to draw a group box on the form. System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.at System.Drawing.SafeNativeMethods.Gdip.GdipDrawLineI(HandleRef graphics, HandleRef pen, Int32 x1, Int32 y1, Int32 x2, Int32 y2)at System.Drawing.Graphics.DrawLine(Pen pen, Int32 x1, Int32 y1, Int32 x2, Int32 y2)
[Code]...
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Feb 27, 2009
I was wondering if there was a way to find out how much memory a data structure too up. So say I declared a list of strings.
Dim theRN As New Dictionary(Of String, Integer)
Say it had 25 elements in it. How to find out how much memory those 25 elements are costing me?
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Oct 17, 2010
I have a function that is exported by a C library with the following signature:
extern "C" BOOL Func()
The function is declared in VB.NET code like this:
<DllImport("mylib.dll", CallingConvention:=CallingConvention.Cdecl)>
Private Shared Function Func() As Boolean
End Function
The problem is that I get an ExecutionEngineException when I call the function from .NET code.
Given that BOOL is typedef'd as int in this C code, should the declaration be different? If so, how should I be declaring this? As Short or Int32? Do I need to marshal the return value?
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May 15, 2011
What are 'unions' in C plus used for? I have some old C++ files that I'm trying to update,and not sure how I can convert these to VB:
struct txyz {
union {
struct {
float_t Time;
float_t X;
float_t Y;
[Code]...
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Feb 3, 2010
I am trying to union to queries to create an XML file. The query itself works as T-SQL, but my implementation as LINQ-TO-XML fails with "Could not translate expression..." error.Am I asking the wrong question? Is this approach flat wrong? I am new to LINQ. How do I create a single XML from 2 queries?
[code]...
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Jan 19, 2010
I know how to call the Union extension method, e.g.
Dim r = productFirstChars.Union(customerFirstChars)
However I do I do this with the Linq syntax, e.g.
from productFirstChars select ?
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Nov 18, 2010
When the user has typed in some information I would like to output possible matches in a descending order, so if someone types in a full first name and a full surname, it should be listed above a result where just the surname matches.I've done something similar in SQL before which worked perfectly, but this time I'd like to do it in LINQ.
Firstname, Surname, City, Country as string variables.
Dim DataEnum As IEnumerable(Of frmTelephone.clsPerson) = alPerson.OfType(Of frmTelephone.clsPerson)()
[code].....
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May 20, 2011
i have a Problem with UNION for LINQ to SQL I have my LINQ query
Dim dc As New ContainerDB.DataClassesDataContext()
Dim test = (From container In dc.GetTable(Of tbl_container)() Where container.pkContainerID = iPkContainerID).Union( _
From containerHist In dc.GetTable(Of tbl_containerHIST)() Where containerHist.pkContainerID = iPkContainerID)
[Code]...
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Aug 3, 2010
Is it possible to create sql union like filter in dataview
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Jun 20, 2012
I need to return the same results from linq as I get using SQL
SELECT DISTINCT Area, Region
FROM dbo.Regions
Union
SELECT null,'All'
Order by 1,2
I use this for showing an "All" selecting in a combo box
My current linq points to a view that does the union for me but I want to know how to do it right in linq. I can't figure out how to union a row for the null,'All' values.
Public Shared Function GetRegions(ByVal Area As String) As IEnumerable
Dim DB As New SiteDBDataContext
Return From values In DB.uv_Areas _
[Code].....
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Sep 19, 2010
I've got a query which returns all invoices and credit notes for a given client, in a loyalty structure query where I need the total value of the points the client achieved through invoices, minus those that was forfeited by credit notes. Now I start my query like this (There are more unions in the query, this is just the first part)
[Code]...
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Jan 14, 2011
I want a combined Ranges. How do I combine two ranges into one?
Dim range1 as Excel.Range = osheetTemperatureData.Range("A7:"A10")
Dim range2 as Excel.Range = osheetTemperatureData.Range("C7:"C10")
Dim range3 as Excel.Range = range1 + range2 '????
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Oct 4, 2010
I have the below C code I want to convert to VB. How do I convert the macro and union over?
c--------------
#define bf_N16
#define S(x,i)(bf_S[i][x.w.byte##i])
[Code]....
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Jul 21, 2009
where to find sample system with complete flow, database structure and data flow.. just for reference purpose.. system like inventory, payroll, accounting, billing and etc..
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Apr 5, 2011
I'm trying to create a list of all my objects from several lists of objects using Union.
Return Chart.AnnotativeNodes.Union( _
Chart.DecisionNodes.Union( _
Chart.EndNodes.Union( _
Chart.StartNodes.Union(Chart.WorkCenterNodes))))
The above line gets an error because I can't union List(of AnnotativeNode) with List(of DecisionNode). Each list defined like List(of EndNode) or List(of StartNode), but each class inherits from the base type Node.Is there a possible way to union these to get a result of IEnumerable(of Node)?
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Mar 11, 2011
I have been given a project to do were i have to create a credit union application in VB2008, what i need to create this application etc like how many labels textboxs etc obviously i need to create it but all am asking is if you could tell me were to start as i am lost and never really created anything in vb 2008.
Here is the spec:
The client is prompted for their name and a personal reference number. If the application is successful then this number becomes the loan agreement reference number. If the applicant has a credit rating of 14 or more points the application is rejected. If the credit rating is less than 14 points then the client is prompted for the loan period (must be equal to 12, 24 or 36 months) and the amount required.
The cost of the loan is 6% if required over 12 months and 8% if over 24 months and 12% over 36 months. This is added to the loan. The applicant's net monthly income and total monthly outgoings are taken into account. If the monthly repayment is more than 25% of disposable income (net income outgoings), then the application is rejected. If the repayment is less than or equal to 25% then the loan is granted and a form is produced and printed with the relevant information, including the loan and repayment amounts.
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Jul 27, 2010
I don't have the same problem when using an untyped dataset.
OK. I have a typed dataset MyDS with a typed datatable MyTable (TableID, Title, Message).
The table gets filled with results from two tables, using a UNION ALL
Select
TableAID,
TableATitle,
[Code]....
Is this how typed datasets handles UNION? I didn't want to create two typed datatables and create separate SQL for each and create a relation.
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Mar 3, 2011
I have been given a project to do were i have to create a credit union application in Visual studio2008 am just wondering if you could tell me what i need to create this application like how many labels textboxs etc obviously i need to create it but all am asking is if you could tell me were to start as i am lost and never really created anything in vs 2008. here is the spec
The applicant's age is considered, thus
CODE:
The client is prompted for their name and a personal reference number. If the application is successful then this number becomes the loan agreement reference number.
If the applicant has a credit rating of 14 or more points the application is rejected.
If the credit rating is less than 14 points then the client is prompted for the loan period (must be equal to 12, 24 or 36 months) and the amount required.
The cost of the loan is 6% if required over 12 months and 8% if over 24 months and 12% over 36 months. This is added to the loan.
The applicant's net monthly income and total monthly outgoings are taken into account.
If the monthly repayment is more than 25% of disposable income (net income outgoings), then the application is rejected.
If the repayment is less than or equal to 25% then the loan is granted and a form is produced and printed with the relevant information, including the loan and repayment amounts.
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Mar 21, 2012
HTML
Private Sub DadosN�oReconciliadosToolStripMenuItem_Click(sender As System.Object, e As System.EventArgs) Handles DadosN�oReconciliadosToolStripMenuItem.Click
[code].....
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Jan 5, 2012
Module Module1
Public Structure structure1
Public TRANS() As structure2
End Structure
Public Structure structure2
Public X() As Integer
End Structure
End Module
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Sep 21, 2011
I have two tables say "Table1" and "Table2". I made a UNION query and saved it as "AllTimesFailure". It is worth mentioning, I am using Access DB. When I am trying to fetch the records from AllTimesFailure through oledbDataReader, it says "The Microsoft Jet database engine cannot find the input table or query 'AllTimesFailure'. Make sure it exists and that its name is spelled correctly.". I double checked query name and found correct but the problem still exists. when I run the same query as I pass through my command object, it works fine in Access query analyzer and fetches records normally.
[Code]...
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May 6, 2010
I'm new to VB.NET. I'm trying very hard to not go screaming back to VB6...... I have a Query stored in an Access2000 database called 'build_VNMON'. (Does that make it a Stored Procedure ?) It uses multiple tables and multiple Union Statements to arrive at the desired results. It may not need to be as convoluted as it is, but I inherited it, and it works. What I really need is to output one column of the build_VNMON result to a text file, so I'm trying to use an OleDbDataReader.
[Code]...
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Jan 5, 2010
I'm new to VB 2008 after having spent a long time with VB6, so I apologize if this is a stupid question. But I'd really like to have this straightened out.
Let's say I have a pretty large structure that has lots of properties.
Code:
Now say that I want an internal database with about 10 instances of this structure total, describing, say, 10 different products that a store sells. When these values are loaded from a database, they remain totally static. (However, they can be different each time a program loads)
Now say that I have a class. Each instance of this class is a type of that BaseProduct structure. Meaning, each instance of the class pertains to one of the 10 types of products that the store sells. However, this class has additional properties that pertain specifically to each instance, which are not static.
Code:
Now, the problem here is... If I have 200 different transactions, each one contains an instance of BaseProduct. BaseProduct is HUGE, and is largely redundant (only 10 types possible), so I think it's a little silly to include a whole copy of it with EVERY transaction. However, the Transaction class really needs information regarding the base product it pertains to. Is there a way to, instead of declaring a New BaseProduct in the Transaction class, to simply make one of the properties of the Transaction class a pointer to a BaseProduct variable?
In VB6, I would accomplish this by making a BaseProduct(10) array, and then giving each Transaction an ID number referring to an entry in that array. But in VB 2008, using class structure, this is impossible. I can't define the BaseProduct(10) array outside of a class in a namespace, and if I define it in the actual application's form, then the class loses modularity since it relies on the application that's using it.
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Aug 29, 2009
I am trying to communicate with an external device and i am trying to send a byte array to the external device via sockets but i am always getting a response the message size is too small so i am not sure what i have done wrong. Between the data type there should be no alignment present and all numbers are represented in little endian format. The char array is not null terminated as mentioned in the protocol specifications.
I have to send data based on a struct that embeds 2 other struct. So here's my vb.net code for the struct used to convert to byte array and the sending part.
Public Structure MESSAGETYPE_OIP_Login
Dim Header() As COMMANDHEADER
Dim UserName() As PSTRING
[Code]....
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