Merge pull request #20 from Maschga/main

add method QueryInt32()

Author: mlnoga

build_test.go

@@ -36,7 +36,7 @@ func TestBuilderParser(t *testing.T) {
 		parser.length = len(builder.Bytes())
 		dg, err := parser.Parse()
 		if err != nil {
-			t.Errorf(err.Error())
+			t.Errorf("%s", err.Error())
 		}
 		if dg.Cmd != tc.Dg.Cmd || dg.Id != tc.Dg.Id || len(dg.Data) != len(tc.Dg.Data) {
 			t.Errorf("error mismatch got %s, expect %s", dg.String(), tc.Dg.String())

connection.go

@@ -158,6 +158,15 @@ func (c *Connection) QueryFloat32(id Identifier) (val float32, err error) {
 	return dg.Float32()
 }
 
+// Queries the given identifier on the RCT device, returning its value as a uint8
+func (c *Connection) QueryInt32(id Identifier) (val int32, err error) {
+	dg, err := c.Query(id)
+	if err != nil {
+		return 0, err
+	}
+	return dg.Int32()
+}
+
 // Queries the given identifier on the RCT device, returning its value as a uint16
 func (c *Connection) QueryUint16(id Identifier) (val uint16, err error) {
 	dg, err := c.Query(id)

datagram.go

@@ -231,6 +231,15 @@ func (d *Datagram) Float32() (val float32, err error) {
 	return math.Float32frombits(binary.BigEndian.Uint32(d.Data)), nil
 }
 
+// Returns datagram body value as an int32
+func (d *Datagram) Int32() (val int32, err error) {
+	if len(d.Data) != 4 {
+		return 0, RecoverableError{fmt.Sprintf("invalid data length %d", len(d.Data))}
+	}
+
+	return int32(binary.BigEndian.Uint32(d.Data)), nil
+}
+
 // Returns datagram body value as a uint16
 func (d *Datagram) Uint16() (val uint16, err error) {
 	if len(d.Data) != 2 {