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Editorial Team
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Asked: 2026-05-28T07:02:42+00:00

I am getting an access violation error in an unmanaged dll I am writing,

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I am getting an access violation error in an unmanaged dll I am writing, but when I try to debug It in a c# application it will only get the last frame of the call stack in Visual Studio’s debug window.

I have debug->exceptions->System.AccessViolationException set to break the debugger when it is thrown.

myunmanaged.dll!ViolatingFunc() Line 100 + 0xc bytes
- - - -
[external code] //myunmanaged.dll!function that I want to see
- - - -
somecsharp.exe!com.somewhere.Form1.CallFuncThatCallsViolator();

I was hoping to walk up the unmanaged stack to see where the data gets turned to garbeldegook.
Is this possible?

Answered
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Enabling unmanaged debugging is step 1, but to get me all the way there I enabled microsoft symbols.

that made my stack trace look more like this:

myunmanaged.dll!ViolatingFunc() 
- - - -
myunmanaged.dll!SomeFunc2() 
- - - -
myunmanaged.dll!SomeFunc()
- - - -
[managed to unmanaged code transition]
- - - -
somecsharp.exe!com.somewhere.Form1.CallFuncThatCallsViolator();
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1 Answer

  1. Editorial Team

    Yes it is. You need to debug your application in ‘Mixed-mode’. Right click on the project, select the ‘Debug’ tab and check ‘Enable unmanaged code debugging’. You will see managed and native frames.

    mixed mode debugging

    Edit: As ChrisO mentions not having MS symbols can make native debugging weird. Add the following to your symbols path for Windows symbols: http://msdl.microsoft.com/download/symbols

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