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August 29, 2015 13:56
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fgets noit version - ctypes works but its weird. copy paste this to scratchpad with environment set to browser
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Cu.import("resource://gre/modules/ctypes.jsm"); | |
var libc = ctypes.open("msvcrt.dll"); | |
var struct_FILE = new ctypes.StructType("FILE"); //set to var only so can run multiple times in scratchpad, can change back to const | |
var fopen = libc.declare("fopen", // symbol name | |
ctypes.default_abi, // cdecl calling convention | |
struct_FILE.ptr, // return type (FILE*) | |
ctypes.char.ptr, // first arg (const char*) | |
ctypes.char.ptr); // second arg (const char*) | |
var fgetc = libc.declare("fgetc", // symbol name | |
ctypes.default_abi, // cdecl calling convention | |
ctypes.int.ptr, // return type (FILE*) | |
struct_FILE.ptr); // second arg (const char*) | |
var fgets = libc.declare("fgets", // symbol name | |
ctypes.default_abi, // cdecl calling convention | |
ctypes.jschar.ptr, // return char pointer | |
ctypes.jschar.ptr, // first arg char pointer | |
ctypes.int, //second arg int | |
struct_FILE.ptr); // third arg FILE pointer | |
var myfile = fopen("C:\\Users\\3K2KYC1\\Desktop\\FirefoxPortable\\newfile.in", "r"); | |
//Services.wm.getMostRecentWindow(null).alert(myfile); | |
var line = new ctypes.jschar; | |
var ret = fgets(line.address(), 2, myfile); | |
Services.wm.getMostRecentWindow(null).alert(line); | |
Services.wm.getMostRecentWindow(null).alert(ret); | |
//newfile.in already exists and its contents is "ABC" no quotes | |
//using size 2 as 2nd arg on line 30 | |
//line - is set to "ctypes.jschar("A")" no quotes, which is the first char in the file, but i said get 2 char why didnt it give first 2 chars if try 3 it gives something weird | |
//ret - is set to "ctypes.jschar.ptr(ctypes.UInt64("0xfba2b32"))" | |
//if use size of 3: | |
//line - "ctypes.jschar("\u4241")" | |
//ret - "ctypes.jschar.ptr(ctypes.UInt64("0x8fefce8"))" |
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Rev2
I learned on MSDN if it has * next to name it means it's a pointer so fixed the code above. Also changed FILE to struct_FILE, as good practice you dont set itself to .ptr I'm thinking, it just makes sense.