fgets alicjab version - ctypes works but its weird. copy paste this to scratchpad with environment set to browser

_example-cTypes-fgets.js

Cu.import("resource://gre/modules/ctypes.jsm");
var libc = ctypes.open("msvcrt.dll");

var FILE = new ctypes.StructType("FILE").ptr; //made var otherwise in scratchpad cant run multiple times, this can be CONST its no issue
var fopen = libc.declare("fopen",                     // symbol name
                        ctypes.default_abi,           // cdecl calling convention
                        FILE,                         // return type (FILE*)
                        ctypes.char.ptr,              // first arg (const char*)
                        ctypes.char.ptr);             // second arg (const char*)


var fgets = libc.declare("fgets",                    
                        ctypes.default_abi,           
                        ctypes.char.ptr,              
                        ctypes.char.ptr,              
                        ctypes.int32_t,               
                        FILE);          


var myfile = fopen("C:\\Users\\3K2KYC1\\Desktop\\FirefoxPortable\\newfile.in", "r");

var SIZE = 100;
var line = new ctypes.char(SIZE);
var ret = fgets(line.address(), SIZE, myfile);

//newfile.in already exists and its contents is "ABC" no quotes
//line - after running code line is set to "ctypes.char(65)" and 65 is character code of A but how do you read line?
//ret - after running code ret is set to "ctypes.char.ptr(ctypes.UInt64("0x1e70e808"))" this also makes no sense to me how do you get a string out of this?



Services.wm.getMostRecentWindow(null).alert(line);
Services.wm.getMostRecentWindow(null).alert(ret);