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My c++ dll takes as input char*.
.
bool testdata(char* data, int dataLen)
From Vb I am doing the following
Declare Function testdata Lib "\abcDLL.dll" (ByRef data As Byte(), ByVal dataLen As Integer) As Boolean
Structure Test
Public header As UInt32
Public lst As UInt32
End Structure
'
Private Function StructToByte(ByVal Struct As Object) As Byte()
Dim iStructSize As Integer = Marshal.SizeOf(Struct)
'Dim iStructSize As Integer = Len(Struct)
Dim buffer As IntPtr = Marshal.AllocHGlobal(iStructSize)
Marshal.StructureToPtr(Struct, buffer, False)
Dim btData(iStructSize - 1) As Byte
Marshal.Copy(buffer, btData, 0, iStructSize)
Marshal.FreeHGlobal(buffer)
Return btData
End Function
While calling the above function
Dim tFrom As Test
tFrom.header = 200
tFrom.lst = 200
Dim ByteArray2() As Byte
ByteArray2 = StructToByte(tFrom)
testdata (ByteArray2, 8)
PROBLEM:
The problem is that when in the dll I type cast the ata into a struc containing only 2 integer, I get incorrect values.
I am strugglign with this for the last 2 days, can anyone plese help me out
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This may be unsafe, but you can directly pass a VB String to C++ dll that take const char * & or something like that depending on whether you pass by value or reference. For that matter you can pass VARIANT or _variant_t's as well using COM.
When you want to modify the string from VBA, then you need to use a bytearray. Otherwise, it is unnecessary.
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You should post this question to the Visual Basic forum, as you are more likely to get an answer there.
txtspeak is the realm of 9 year old children, not developers. Christian Graus
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I have a class, call it Inventory, it does some basic database tasks using a BackgroundWorker like SaveChanges(), LoadFirstItem() etc. In my RunWorkerCompleted method PropertyChanged events are fired to notify the UI to update itself.
This works swimmingly in my WinForms app and the BackGroundWorker is clearly doing it's thing successfully, but I'm having trouble writing [TestMethod()]'s for the class in a test project. In a test project, it seems like after calling RunWorkerAsync the DoWork method doesn't get called, and as a result neither does RunWorkerCompleted, and my tests always fail.
Breakpoints in DoWork or RunWorkerCompleted are not hit. I assumed this was because my test method was not waiting for the background thread to finish so I've tried sleeping the main thread to see if the BackgroundWorker can catch up, I've tried the Application.DoEvents() thing, but I'm a bit of a rookie in the threading department... and the authoring of Unit Tests department for that matter! uh oh 
Any pointers on how to please my BackgroundWorker in a [TestMethod()]?
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Hi Jack,
Not sure, but I would guess your test framework is being run from some thread other than the main thread.
BackgroundWorker (and other threads) are not allowed to touch GUI Controls directly, you know that. Some of their events (ReportProgress and RunWorkCompleted) take care of the thread barrier automatically, but only so when the BackgroundWorker got created by the main thread. Weird things could happen when an arbitrary thread creates a BGW whose event handlers in turn try to modify the GUI.
To make sure whether your DoWork method gets called or not, I suggest you simply insert a MessageBox.Show(), that one doesn't care about thread boundaries at all. An alternative diagnostic tool is:
Console.WriteLine("Method XYZ running on thread "+Thread.CurrentThread.ManagedThreadId.ToString("X2"));
which allows you to visualize the thread on which the caller is running.
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First of all, sorry for the tardy reply.
With your suggestion I was able to confirm DoWork was running, the Test Framework was on thread 12, DoWork was on 14.
Now I'm wondering, if the BackGroundWorker only knows how to notify the "main" thread, and the Test Framework is not on the main thread, doesn't that mean I'm sort of stuck with testing this BackGroundWorker business?
Since I know the DoWork methods are running I suppose I could run a separate set of tests to confirm their results, but ick
Or, maybe I could ditch the BackGroundWorker and code the necessary threading behaviour myself? Do you think I could work around my issue in this way?
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There is no need to ditch the BackgroundWorker at all; when a BGW is created by the main thread, one of its major advantages is its ReportProgress and RunWorkCompleted events run on the main thread too; when created elsewhere, you loose that advantage, but that is what regular threads do all the time.
So you would have to explicitly call Control.InvokeRequired and Control.Invoke to get the results towards your GUI, as if your BGW where just another thread. See e.g. here[^] for details, in case you need a refresh.
There might be an alternative, fiddling with SynchronizationContexts, but I'm not familiar with that.
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Hy, im adding Audittrail to a project, that uses .nettiers. I know, that its possible to implement audittrail with the EF.
But is it possible to do this, when you didnt use the EF for your O/R-Mapping?
Thanks a lot for answers!
andreas
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Hi
I am looking to read my Program's process memory. So I dump with taskmanager in *.dmp and but I don't know how to read in my own Visual C# .net program.
My task is to search into memory of program to find the strings
So i am looking open dump file similiar to "WinHex" program and then search into strings.
Regards
Simran
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Pick one forum and stick with it. Posting to multiple forums will just get you ignored
I know the language. I've read a book. - _Madmatt
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(sorry for my english )
I currently work on a code editor with syntaxtic coloring in VB.Net. As much examples found on the Net, I left on the solution "selection the key words found and coloring selection".
As i know it's hard to make something clean and fast (I'm a beginner), I Override "onTextChanged" with a boolean flag "CanPaint", and override "WndProc" for checking if it's "Paint message" for redraw my richTextBox only when it is necessary.
For speeding, I check for keyword only on the current line.
All works fine, except when a keyword is separate on several lines. AS I want coloring XML and HTML tags, the system must also function on several lines, and it is there that I do not know how to consider the problem.
I can easilly chek for keywords on all lines of the richTextBox, but if there's 500 or 1000 lines ... VB is likely to pain I think.
I thought of carrying out in background task all X seconds a “srcipt inspector” on all the text while keeping my coloring by lines… but I know nothing with the thread yet there.
I do not see how to consider the problem. I am taking of all councils  Thanks
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Hi,
I've done a couple of syntax colorizers, most of them without using a RichTextBox at all.
RTB is rather slow, as it performs complex parsing and formatting jobs, and requires all text to be concatenated.
Here is what I typically do:
- implement the colorizer logic on my own data structures, tailored for that purpose;
- store each line in a separate object, all of them in a list;
- a line would consist of the text itself, plus some extra information, e.g. "this line opens a multi-line comment", "this line closes a multi-line comment", etc.
- scan the document from start till current view point to determine state (e.g. am I in the middle of a
multi-line comment)
- only execute the actual coloring logic on visible lines (that is a few dozen, whatever the size of the current document is)
- and when the output were an RTB, I would probably generate the RTF string myself, rather than doing lots of selections and modifications.
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Create a new Win32 project and select static lib or dll in the project type page. VS2005 will set the build options automatically to build the selected library type.
txtspeak is the realm of 9 year old children, not developers. Christian Graus
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thanks but but how to link the libraries which i want with the win32 pjt newly created?
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sindhumahe wrote: thanks but but how to link the libraries which i want with the win32 pjt newly created?
Just add the library to your Linker options in the project properties. Obviously time to go through either the VS help files or the entire properties lists to get familiar with some of the basics.
[edit]Note: please do not remove your original question, as nobody can see what the answers refer to. Remember your question may help someone else in the future.[/edit]
txtspeak is the realm of 9 year old children, not developers. Christian Graus
modified on Thursday, March 25, 2010 8:22 AM
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Don't remove questions if they already got replies, it results in a messy forum. See the forum guidelines.
Your original post was:
hi ,
can anyone tell me how to build an object file library in VS2005 framework.
for ex :libBasicUsageEnvironment.lib, how to build this library..?
i am a newbie to .net . kindly help me
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Hi Luc,
Did you already have a copy of the original or do you have some method of finding deleted messages?
Richard
txtspeak is the realm of 9 year old children, not developers. Christian Graus
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one of my spiders takes a snapshot of www.codeproject.com on an hourly base;
and a second one posts replies to the questions that match some filter criteria.
More seriously, yes there are ways to see what isn't there any more. I only use it to tell them of though.
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i am having a doubt on the Difference between the Tier and layer architecture ????
Thanks and regards
Mahendran Chandramohan
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I don't know what the definition says in the books, but.. Different tiers often run on different machines (client/server etc), whereas layers (DAL, BL, CL, UI) are often on the same machine.
The UI-layer sometimes becomes a tier, if that makes sense
I are Troll 
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Wrong forum for your question....this is the .Net framework forum.
Layers means way to organizing the code logically not physically. Tiers means code separation on network or process boundaries.
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It is a grey area. It appears that many articles use the terms tier and layer interchangeably.
Some people distinguish the two as multi-layer describing the separation of code into functional areas such as GUI, Business Logic and Data Access; and multi-tier describing a physical separation by process boundary, sometime accompanied by distribution of the tiers on separate hardware. This distinction is moot, as the code in each tier is the same code as in each layer, just separated by process boundary. Therefore a multi-tier application is also multi-layer, and many multi-layer applications are multi-tier. I would argue that whether or not there is a process separation is irrelevant, and often confuses matters. The big question from an architectural point of view is are you using a client-server architecture.
Multi-tier architecture[^]
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Hi
I've noticed a performance problem in my application. My application does some calculation inside a 'for' loop and show that answer on the canvas. When I minimize the application it executes fast.If it is in maximized then it takes too much time to finish the for loop.
Inside the for loop I've used Control.Invalidate(). Will it make the performance changes when it is minimized and maximized?
Thank You.
Regards,
R.Sumanan
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