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I have a C++ win32 console application (built using Visual Studio 2005). I have complete code. I need to convert this console application to a dll and I want to call this DLL in a ASP.Net web service (Just because I know how to create an ASP.Net webservice). I am totally new to C++ programming but now I am getting better at it.
I have successfuly created the DLL of that console app (by changing project properties)and also imported the DLL function successfuly. I can debug the dll code when called from my C#/C++ managed console app (I have tried both C++ and C#).
The problem is when ever the code in DLL uses a std::vector, or any other STL based contianers. The code gives exception i.e.
An unhandled exception of type 'System.AccessViolationException' occurred in C++ManagedConsole.exe
Additional information: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
can someone please point me to a possible solution for this problem. Though I have the code but I cant just remove all the code using the std::vector, or other containers.
Thanking in advance for any kind of hints.
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s.m.shah wrote: can someone please point me to a possible solution for this problem.
Well we would have to know what the problem is to point to any solutions.
It might have helped if you had posted code showing how you use the vector(s) and what specific line of code throws the exception.
led mike
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Hello,
I want to invoke methods from the unmanaged code(COM component.).
I want some suggestion for that, should i go for managed C++ wrapper or
will be it OK if i go for C#.
Basically main problem with the com is that, it has exposed one
method named Init((Inknown *) *pSYNInfo).
But they don't have exposed the SYNinfo class, which needs to be
passed to Init function. So what approach should i do so that i can
invoke the Init() function after setting the proper values to the SYNInfo
Class. Can i access the SYNInfo file by adding the header file in the
managed C++. Please help me out.
Thanks in advance.
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Rahul.RK wrote: Can i access the SYNInfo file by adding the header file in the
managed C++.
Sort of. Technically you will have what is called "mixed-mode" C++. That means it is comprised of both native code and managed code. If you did a "pure managed" project you could not be able to include the native C++ header file.
Go to the Articles section of CodeProject and read the C++/CLI beginners articles, they have been rated very high.
led mike
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Hi,
When i am trying to build my VC++ exe using /clr option, i am getting the following Link Error:
StdAfx.obj : error LNK2020: unresolved token (0A001984)......
Please could someone suggest me how to resolve this error?
Regards
Rinnu
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Rinnu Mary wrote: When i am trying to build my VC++ exe using /clr option, i am getting the following Link Error:
StdAfx.obj : error LNK2020: unresolved token (0A001984)......
Please could someone suggest me how to resolve this error?
Well here is how I would start, I would navigate my browser to google.com and enter the search phrase
MSDN clr error LNK2020
Then click the search button and start analyzing the results.
led mike
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some one please tell the full code for connecting oracle 9i database from asp.net 2.0 plzzzzzzzzzzzzzzzzzzzzzzzzzzz
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www.connectionstrings.com[^] might be helpful...
"I guess it's what separates the professionals from the drag and drop, girly wirly, namby pamby, wishy washy, can't code for crap types." - Pete O'Hanlon
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Stop posting this garbage you freak and go find a job in a circus
led mike
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led mike wrote: Stop posting this garbage you freak and go find a job in a circus
 I am really curious as to what the deleted post originally said 
"I guess it's what separates the professionals from the drag and drop, girly wirly, namby pamby, wishy washy, can't code for crap types." - Pete O'Hanlon
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There was three of the posts actually - all out-of-context crap.
This one only stayed because there was a reply before many of us marked them as abuse
Mark
Mark Salsbery
Microsoft MVP - Visual C++
![Java | [Coffee]](https://www.codeproject.com/script/Forums/Images/coffee.gif)
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Did it happen to look like the crap on his blog space in the profile? Just tons of crap code
"I guess it's what separates the professionals from the drag and drop, girly wirly, namby pamby, wishy washy, can't code for crap types." - Pete O'Hanlon
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Paul Conrad wrote: Did it happen to look like the crap on his blog space in the profile? Just tons of crap code
Yep. Like Mark said there were three of them. I replied to the top one and sent abuse on all of them. Guess I shouldn't have posted a reply 
led mike
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Hi,
Can you give me any Managed c++ treeview creation example project.
Thanks
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Have you tried searching around here or on google?
"I guess it's what separates the professionals from the drag and drop, girly wirly, namby pamby, wishy washy, can't code for crap types." - Pete O'Hanlon
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HOPEFULLY someone can help me.
I am trying to access a function from an unmanaged DLL from my visual c++ managed GUI.
Declaration of the function I am trying to import from unmanaged (native) DLL is:
extern "C" __declspec(dllexport) TGrayImage<int>* init_seg(TGrayImage<float>* pImg, TMonoImage* monoImg, int nClass)
Even though there are many functons in the DLL, only this function is exported.
Now In my GUI, I have added the following line to import that functon so that I can call that functon from GUI.
At the top of the file after using namespaces
[System::Runtime::InteropServices::DllImport("segment.dll")]
TGrayImage<int> * init_seg(TGrayImage<float>* pimg, TMonoImage* mono, int nNum);
I didn't do any Marshalling parameter. I have no idea how to Marshall a pointer to a Template class or pointer to a class. I searched before posting but I didn't get clear understanding about it.
Just for clarification, pimg and mono I am trying to pass is Managed varialble created within managed GUI.
TGrayImage<float>* pimg = new TGrayImage<float>* (width,height);// used new not gcnew
TmonoImage* mono = new TMonoImage(width, height);
I have added the proper library (compiled with pure:MSIL) in my my GUI which supplied TGrayImage,TMonoImage.
Header file for TGrayImage and TMonoImage already included in the GUI.
When I call init_seg function from GUI, I got the following message:
An unhandled exception of type 'System.AccessViolationException' occurred in GUI.exe
Additional information: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
Please help me to Marshall these parameter correctway. I will appreciate your big help.
Thank you.
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I can't decipher your post.
s196675m wrote: I am trying to access a function from an unmanaged DLL from my visual c++ managed GUI.
Declaration of the function I am trying to import from unmanaged (native) DLL is:
extern "C" __declspec(dllexport) TGrayImage<int>* init_seg(TGrayImage<float>* pImg, TMonoImage* monoImg, int nClass)
First you indicate an unmanged source, then:
s196675m wrote: Just for clarification, pimg and mono I am trying to pass is Managed varialble created within managed GUI.
TGrayImage<float>* pimg = new TGrayImage<float>* (width,height);// used new not gcnew
TmonoImage* mono = new TMonoImage(width, height);
I have added the proper library (compiled with pure:MSIL) in my my GUI which supplied TGrayImage,TMonoImage.
At this point I am at a complete loss to understand your scenario.
led mike
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Sorry, for ambiguity.
led mike wrote: s196675m wrote:
I am trying to access a function from an unmanaged DLL from my visual c++ managed GUI.
Declaration of the function I am trying to import from unmanaged (native) DLL is:
extern "C" __declspec(dllexport) TGrayImage<int>* init_seg(TGrayImage<float>* pImg, TMonoImage* monoImg, int nClass)
First you indicate an unmanged source, then:
Yes you are right. This line of declaration from unmanged source. (part of unmanaged DLL.
led mike wrote: s196675m wrote:
Just for clarification, pimg and mono I am trying to pass is Managed varialble created within managed GUI.
TGrayImage<float>* pimg = new TGrayImage<float>* (width,height);// used new not gcnew
TmonoImage* mono = new TMonoImage(width, height);
These sample code is part of GUI( managed). I just showed here how I initialize pimg and mono variables before passing to the imported function
I have added the proper library (compiled with pure:MSIL) in my my GUI which supplied TGrayImage,TMonoImage.
Here I am trying to mean, The other library I used with GUI also complied as a managed library.
At this point I am at a complete loss to understand your scenario.
Now my main question is:
(1) Did I imported the function correctly ?
(2) Do I need to marshall the parameters before passing to the function?
(3) How Can I marshall the first two parameters?
Thank you.
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s196675m wrote: Now my main question is:
Sorry but have not at all cleared up the seeming contradictory statements in your orginal post
s196675m wrote: I have added the proper library (compiled with pure:MSIL) in my my GUI which supplied TGrayImage,TMonoImage.
Here I am trying to mean, The other library I used with GUI also complied as a managed library.
First you say it's a native library then you seem to be saying you compiled it as a managed library (pure:MSIL). It can't be both so I still have no idea what you are saying.
led mike
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The passed pointers should marshal no problem.
Where exactly is the exception occurring? Can you step into the init_seg() call in the debugger?
Mark
Mark Salsbery
Microsoft MVP - Visual C++
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I think the easiest way is to use #pragma unmanaged/managed.
Set your project properties to /clr, create a native function and wrap it with #pragma unmanaged/managed, include your .h native library header and link to your .lib.
Call the native function from your GUI.
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Maybe, but I tried code like the OP's and it works fine. Until (s)he answers with better
error info, it's hard to tell, but I think the error has nothing to do with marshaling.
Mark
Mark Salsbery
Microsoft MVP - Visual C++
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Mark Salsbery wrote: but I think the error has nothing to do with marshaling.
It's far more likely it's due to copy/paste coding rather than actually understanding the technologies you are attempting to utilize.
By the way, what the heck were you doing being on here 7 hours ago? Get some sleep 
led mike
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Agreed.
led mike wrote: By the way, what the heck were you doing being on here 7 hours ago?
Hehe it's hectic around here. My GF is working long hours here on graduation projects for her second degree.
So I just hang out getting some work done or playing on CP...until the screenwriters start cranking out new TV show
episodes again I work at home so regular work hours just don't exist.
Mark Salsbery
Microsoft MVP - Visual C++
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