Stack overflow in mixed native/managed DLL

[Graham]

Hi everyone,

I have a DLL which contains both native and managed C++. To
the best of my knowledge, the native code does not use MFC.

The managed C++ is basically a wrapper around the native
C++ ... so the relevant code would look like this:

public __gc class ManagedWrapper {

private:
MyNativeClass * m_pNative;

public:
ManagedWrapper() {
m_pNative = new MyNativeClass();
}
}

The native constructor isn't even getting a chance to run;
I get a stack overflow on the "new" operator. The stack
looks like this: (I'll write it out in the opposite order
to which it appears in VS.NET's call stack window, as this
is clearer in email)

VBNetApp.frmMain_Load()
ManagedWrapperDLL.ManagedWrapper()
_nh_malloc_dbg(unsigned int nSize=24, ...) Line 254 + 0x7
_lock(int locknum=4) Line 311 + 0x9
_mtinitlocknum(int locknum=4) Line 251 + 0x13
_malloc_dbg(unsigned int nSize=24, ...) Line 176 + 0x1b

Then these last four lines repeat ad infinitum until a
stack overflow occurs. The loop is clearly visible in the
code (dbgheap.c and mlock.c).

I'm using VS.NET 2003. The DLL is built in debug mode right
now (/MTd).

Can anyone tell me what I've done wrong, and/or how to
correct the problem?

Thanks.

-- graham

[Graham]

The answer I found is "don't use /MT(d) for a DLL, it won't
work -- use /MD(d) instead".

This also means using msvcrt(d) instead of libcmt(d).

That's the limit of my understanding, at this point...
maybe who actually knows what all this means can briefly
explain what all of this means.

-- graham

[Dan Peterson]

See:
http://tinyurl.com/9opt

I had the same problem which was solved by managing how the CRT is
loaded from a Mixed-Mode DLL. The article contains a 'Knowledge Base
link' (http://support.microsoft.com/?id=814472) with instuctions on
how to correct the problem.
--
Dan Peterson
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