VuNguyen – 09-08 Apr 14

const ffi = require("ffi-napi");
const ref = require("ref-napi");
const iconv = require("iconv-lite");

const user32 = ffi.Library("user32", {
    EnumWindows: ["bool", ["pointer", "int32"]],
    IsWindowVisible: ["bool", ["int32"]],
    GetWindowTextW: ["int", ["int", "pointer", "int"]],
    GetWindowThreadProcessId: ["int32", ["int", "pointer"]],
});

const MAX_TITLE_LENGTH = 255;
const windowInfos = [];

const callback = ffi.Callback("bool", ["int32", "int32"], (hwnd, lParam) => {
    const isVisible = user32.IsWindowVisible(hwnd);
    if (isVisible) {
        const buf = Buffer.alloc(MAX_TITLE_LENGTH * 2); // multiply by 2 for wide char support
        user32.GetWindowTextW(hwnd, buf, buf.length);
        const nullTerminatorIndex = buf.indexOf("\0\0"); // wide char null terminator is two bytes long
        const titleBuffer = buf.slice(0, nullTerminatorIndex);
        const title = iconv.decode(titleBuffer, "utf-16le").trim();

        if (!title) return true;

        try {
            const pid = ref.alloc("int");
            user32.GetWindowThreadProcessId(hwnd, pid);
            const id = pid.deref();
            const windowInfo = {
                id: id,
                title: title,
            };
            windowInfos.push(windowInfo);

            console.log(windowInfo);
        } catch (error) {
            console.error("Error adding window:", error);
        }
    }
    return true;
});

try {
    user32.EnumWindows(callback, 0);
} catch (error) {
    console.error("Error enumerating windows:", error);
}

console.log(windowInfos);

#
# Fatal error in , line 0
# Check failed: result.second.
#
#
#
#FailureMessage Object: 000000B259F4CD70
 1: 00007FF68D20BD2F v8::internal::CodeObjectRegistry::~CodeObjectRegistry+112159
 2: 00007FF68D12B11F v8::CFunctionInfo::HasOptions+7039
 3: 00007FF68DDFFD72 V8_Fatal+162
 4: 00007FF68D855EBD v8::internal::BackingStore::Reallocate+621
 5: 00007FF68DAC4149 v8::ArrayBuffer::GetBackingStore+137
 6: 00007FF68D1DFDB9 napi_get_typedarray_info+393
 7: 00007FFE9BA18828
 8: 00007FFE9BA17C19
 9: 00007FFE9BA1D003
10: 00007FFE9BA1ED79
11: 00007FFE9BA1DD09
12: 00007FFE9BA1949E
13: 00007FFE9BA180B7
14: 00007FFE9BA1EF63
15: 00007FF68D1DA696 node::Stop+36246
16: 00007FF68DA92F10 v8::internal::Builtins::builtin_handle+320880
17: 00007FF68DA9251F v8::internal::Builtins::builtin_handle+318335
18: 00007FF68DA9280F v8::internal::Builtins::builtin_handle+319087
19: 00007FF68DA92653 v8::internal::Builtins::builtin_handle+318643
... So on