I should correct something I wrote in that last reply. I wrote:
>
> Patrick wrote:
> > I had to use NSS_Get_SECOID_AlgorithmIDTemplate instead of
> > SECOID_AlgorithmIDTemplate in order to get the code to compile:
> >
> > static SEC_ASN1Template template[] = {
> > { SEC_ASN1_SEQUENCE, 0, NULL, sizeof (SDRResult) },
> > { SEC_ASN1_OCTET_STRING, offsetof(SDRResult, keyid) },
> > { SEC_ASN1_INLINE, offsetof(SDRResult, alg),
> > NSS_Get_SECOID_AlgorithmIDTemplate },
> > { SEC_ASN1_OCTET_STRING, offsetof(SDRResult, data) },
> > { 0 }
> > };
> > When my app runs, Windows throws an "Exception Breakpoint error: breakpoint
> > has been reached (0x800000003)" error message...I attached the stack trace
> > from MSVC++.
>
> > Is there a bug here? What's the Breakpoint error all about?
>
> You changed the third part of the triplet to be correct for Windows, but
> you didn't change the first part to go with it.
That's not quite right. I should have written:
You changed the address of the template (which is a data item in another
DLL) to the address of a function in that other DLL. Changing the address
of the template into the address of the function was not the right
solution for windows.
Windows can link the address of the function (unlike the address of a data
item) in another DLL, so the build succeeded. But at run time the code
that interpreted the template attempted to interpret the instructions of
the function as if they were a template, and ... blammo.
The correct solution for windows, which is done by those macros I
described in the previous message, has two parts:
1. Change the address of the external template to the address of a pointer
to a function (in that other DLL) that returns the address of the template
(also in that other DLL), and
2. Set a flag that tells the template interpreter to call the function
through that pointer, rather than using the address of the pointer as a
template address.
On windows, the macro SEC_ASN1_MKSUB creates the pointer to the function;
the macro SEC_ASN1_SUB expands to the address of that pointer, and
the macro SEC_ASN1_XTRN sets the flag to tell the template interpreter
how to use that address. On Unix, these macros are more-or-less no-ops.
--
Nelson Bolyard Netscape
Disclaimer: I speak for myself, not for Netscape
