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Editorial Team
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Asked: 2026-05-16T22:10:22+00:00

I have a mixed-mode application in which I want to fire up the debugger

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I have a mixed-mode application in which I want to fire up the debugger if an error is found in the internal datastructures.
Strange enough, the DebugBreak and __debugbreak functions don’t seem to work as expected (the .Net framework seems to intercept the breakpoint exception, leading to all kinds of nasty side effects).

The solution of my earlier question (see Behavior of DebugBreak differs between unmanaged and mixed (unmanaged+managed) application?) seems to work for very simple situations, but not in my application (it just leaves my application hanging).

Luckily, I found out that executing System::Diagnostics::Debugger::Launch seems to solve the problem. However, the place where I need to have this logic is used in both unmanaged as in mixed-mode applications. Also, calling managed code in the place where I want to put the logic is rather difficult.

Therefore: is there an unmanaged alternative for the System::Diagnostics::Debugger::Launch function?

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1 Answer

  1. Editorial Team

    It seems to me that the usage of System::Diagnostics::Debugger::Launch is a good point. .NET Debugger like some other .NET classes has also unmanaged interface for example ICorDebug::DebugActiveProcess. It seem to me you should try to use it. You can read more about this in http://msdn.microsoft.com/en-us/magazine/cc301510.aspx. It is will not work, that you can try to write you own small COM interface in .NET with one method only which call System::Diagnostics::Debugger::Launch.

    Another ways is the usage Just-In-Time Debugging and How to: Launch the Debugger Automatically.

    If you don’t need to debug the startup code of your application you can do what you want in very simple way: At the beginning of your application in the main thread (or in all threads which you want to debug) you can display a message box. After you see the message box you can start Visual Studio as Administrator and use “Debug” / “Attach to Process…”. It works very good. If you want to debug a Windows Service you should use WTSSendMessage instead of MessageBox. I am using this way since many years and it work perfect.

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