This is usually Excel-speak for "missing dll dependency" - I'm not totally clear if you're linking against boost.thread statically or dynamically but either way a required dll (possibly boost thread or maybe boost date time, boost system, boost chrono) is not on your PATH.

On 3 Nov 2014, at 20:14, Grison PG Pierre (External DEXIA-US) <Pierre.Grison@dexia-us.com> wrote:

Hello,

I encounter a problem with the Thread library. The library works fine when I use it in a .exe project. It means it has been correctly built. Then I try to use the same library in an DLL project (so as to build a XLL object thanks to the XLW library). But as soon as I add the line

#include <boost/thread.hpp>

to my project, even if it compile without any problem, I get the following message when I debug my project through Excel:

The file you are trying to open, “mylibrary.xll” is in a different format than specified by the file extension, Verify that the file is not corrupted […]. Do you want to open the file now?

And I can no more use my C++ functions in Excel. Do you have already encounter this problem?

I use VS2010. I have tried both Multi-threaded Debug DLL (/MDd) and Multi-threaded DLL (/MD) options. My solution includes two other static libraries and also with the classic RunInterfaceGenerator XLW-project (the one which is executed when debugging).

Regards,

Pierre

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