Question

I have a library and I have generated tcl bindings for the same using swig. The dll thus generated is xyz_tcl.dll if my original lib dll us xyz.dll. but when I try to load the dll its says “invalid command name “MZ””. Can any one tell me what could be reason for it.

Answer 1

The MZ is almost certainly the first few bytes of the DLL (it’s the “magic number” of the file format) so at a guess you’re trying to do:

source xyz_tcl.dll

That won’t work. It contains compiled C code that integrates with Tcl, but not a Tcl script. Instead, you need to do:

load xyz_tcl.dll

Of course, it should be build into a package (which is a directory containing the required DLLs and a file pkgIndex.tcl) which would then let you do something like this instead:

package require xyz

(The pkgIndex.tcl file contains instructions on how to define the package using the other files, through load and source as necessary.)