return err code on promise reject

Author: fabioriva

examples/async.js

@@ -0,0 +1,14 @@
+const snap7 = require("napi-snap7");
+
+const client = new snap7.S7Client();
+
+const time = (ms) => console.log("| Execution time : %d ms", ms);
+
+const res = client.ConnectTo("192.168.57.12", 0, 1);
+
+client.ReadArea(0x84, 510, 0, 100, 0x02, (err, data) => {
+  if (err) return console.log(snap7.CliErrorText(err));
+  console.log("Data", data);
+  time(client.ExecTime());
+  client.Disconnect();
+});

package.json

@@ -21,7 +21,7 @@
   "scripts": {
     "install": "node-gyp-build",
     "test": "echo \"Error: no test specified\"",
-    "prebuild": "prebuildify --napi"
+    "build": "prebuildify --napi"
   },
   "repository": {
     "type": "git",

prebuilds/linux-x64/node.napi.node

@@ -32,25 +32,19 @@ class ReadPromiseWorker : public AsyncWorker
 
         if (res != 0)
         {
-            AsyncWorker::SetError("Error!");
+            AsyncWorker::SetError("Eroor");
         }
     }
 
     void OnOK()
     {
-        if (res == 0)
-        {
-            deferred.Resolve(Buffer<uint8_t>::New(Env(), dataPtr, dataLength));
-        }
-        else
-        {
-            deferred.Resolve(Number::New(Env(), res));
-        }
+        deferred.Resolve(Buffer<uint8_t>::New(Env(), dataPtr, dataLength));
     }
 
     void OnError(Error const &error)
     {
-        deferred.Reject(error.Value());
+        // deferred.Reject(error.Value());
+        deferred.Reject(Number::New(Env(), res));
     }
 
     Promise GetPromise() { return deferred.Promise(); }