Using dll in js-ctypes mozilla add-on sdk - view program's STDOUT?

Question

Edited because I had the DLL built wrong:

I have built a DLL, and if I do a dumpbin /exports command on the DLL I see the following:

Dump of file stun_driver.dll

File Type: DLL

  Section contains the following exports for stun_driver.dll

00000000 characteristics
546E6C63 time date stamp Thu Nov 20 17:34:11 2014
    0.00 version
       1 ordinal base
       4 number of functions
       4 number of names

ordinal hint RVA      name

      1    0 00001005 OPENSSL_Applink = @ILT+0(_OPENSSL_Applink)
      2    1 00001320 launch_stun = @ILT+795(_launch_stun)
      3    2 000011D6 stop_stun = @ILT+465(_stop_stun)
      4    3 00001078 test_print = @ILT+115(_test_print)

  Summary

   1A000 .data
    2000 .idata
   46000 .rdata
    F000 .reloc
  135000 .text

My code for executing the "test_print" function, is as follows:

/* import js-ctypes */
 Cu.import("resource://gre/modules/ctypes.jsm")
 var stun_driver = ctypes.open("C:\\stun_driver.dll");

const test_print = stun_driver.declare("test_print", ctypes.default_abi, ctypes.int32_t);
.
.
.//in a button
test_print();

So my question is, if my test_print() is doing a printf("Hello World"), where does that text go? It doesn't seem to be getting logged to my browser console, or to the dos console i am running "cfx run" from.

Answer 1

If you start Firefox from a terminal window, you should see the output there.