fix ver in changelog

readme, changelog updated to reflect changes

version bump

CHANGELOG.md

@@ -11,6 +11,30 @@ Before any major/minor/patch bump all unit tests will be run to verify they pass
 
 -   [x]
 
+## [1.5.0] - 2022-09-07
+
+### Changed
+
+-   changes to error handling.
+    -   functions that wrap capi calls now return error types.
+    -   higher level functions print error messages
+
+## [1.4.0] - 2022-08-22
+
+### Added
+
+-   midi type, supports midi devices
+-   midi updates added to the pooler
+-   event type, supports toggling event updates through EventAdd() and EventRemove() methods.
+-   Forwarder methods for get/set float/string parameters added to Remote type
+-   Midi, Events sections added to README.
+
+### Changed
+
+-   macrobutton updates moved into its own goroutine
+-   observer example updated to include midi updates
+-   level updates are now disabled by default, should be enabled explicitly
+
 ## [1.2.0] - 2022-07-10
 
 ### Added

README.md

@@ -8,9 +8,9 @@ For an outline of past/future changes refer to: [CHANGELOG](CHANGELOG.md)
 
 ## Tested against
 
--   Basic 1.0.8.2
+-   Basic 1.0.8.4
--   Banana 2.0.6.2
+-   Banana 2.0.6.4
--   Potato 3.0.2.2
+-   Potato 3.0.2.4
 
 ## Requirements
 
@@ -42,21 +42,27 @@ package main
 
 import (
 	"fmt"
+	"log"
 
 	"github.com/onyx-and-iris/voicemeeter-api-go"
 )
 
 func main() {
 	kindId := "banana"
-	vm := voicemeeter.NewRemote(kindId)
+	vm, err := voicemeeter.NewRemote(kindId)
+	if err != nil {
+		log.Fatal(err)
+	}
 
-	vm.Login()
+	err = vm.Login()
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer vm.Logout()
 
 	vm.Strip[0].SetLabel("rode podmic")
 	vm.Strip[0].SetMute(true)
 	fmt.Printf("Strip 0 (%s) mute was set to %v\n", vm.Strip[0].GetLabel(), vm.Strip[0].GetMute())
-
-	vm.Logout()
 }
 ```
 
@@ -98,6 +104,10 @@ pointer to device type, represents physical input/output hardware devices
 
 pointer to recorder type, represents the recorder
 
+#### `vm.Midi`
+
+pointer to midi type, represents a connected midi device
+
 #### `vm.Type()`
 
 returns the type of Voicemeeter as a string
@@ -106,6 +116,22 @@ returns the type of Voicemeeter as a string
 
 returns the version of Voicemeeter as a string
 
+#### `vm.GetFloat(<param>)`
+
+gets a float parameter value
+
+#### `vm.SetFloat(<param>, <value>)`
+
+sets a float parameter value eg. vm.SetFloat("strip[0].mute", 1)
+
+#### `vm.GetString(<param>)`
+
+gets a string parameter value
+
+#### `vm.SetString(<param>, <value>)`
+
+sets a string parameter value eg. vm.SetString("strip[0].label", "podmic")
+
 #### `vm.SendText(<script>)`
 
 sets many parameters in script format eg. ("Strip[0].Mute=1;Bus[3].Gain=3.6")
@@ -118,13 +144,21 @@ register an object as an observer
 
 deregister an object as an observer
 
+#### `vm.EventAdd(<event>)`
+
+adds an event to the pooler eg. vm.EventAdd("ldirty")
+
+#### `vm.EventRemove(<event>)`
+
+removes an event to the pooler eg. vm.EventRemove("pdirty")
+
 #### `vm.Pdirty()`
 
 returns True iff a GUI parameter has changed
 
 #### `vm.Mdirty()`
 
-returns True iff a macrobutton paramter has changed
+returns True iff a macrobutton parameter has changed
 
 ## `Available commands`
 
@@ -348,8 +382,8 @@ vm.Vban.OutStream[3].SetBit(24)
 
 The following methods are available
 
--   `Ins`
+-   `Ins()`
--   `Outs`
+-   `Outs()`
 -   `Input(val int)`
 -   `Output(val int)`
 
@@ -386,6 +420,38 @@ vm.Recorder.Loop(true)
 vm.Recorder.SetB2(false)
 ```
 
+### Midi
+
+The following methods are available
+
+-   `Channel()` returns the current midi channel
+-   `Current()` returns the most recently pressed midi button
+-   `Get(<button>)` returns the value in cache for the midi button
+
+example:
+
+```go
+var current = vm.Midi.Current()
+var val = vm.Midi.Get(current)
+```
+
+### Events
+
+By default level updates are disabled. Any event may be enabled or disabled. The following events exist:
+
+-   `pdirty` parameter updates
+-   `mdirty` macrobutton updates
+-   `midi` midi updates
+-   `ldirty` level updates
+
+example:
+
+```go
+vm.EventAdd("ldirty")
+
+vm.EventRemove("pdirty")
+```
+
 ### Run tests
 
 To run all tests:

base.go

@@ -4,7 +4,6 @@ import (
 	"bytes"
 	"fmt"
 	"math"
-	"os"
 	"strings"
 	"syscall"
 	"time"
@@ -37,41 +36,43 @@ var (
 	vmMdirty         = mod.NewProc("VBVMR_MacroButton_IsDirty")
 	vmGetMacroStatus = mod.NewProc("VBVMR_MacroButton_GetStatus")
 	vmSetMacroStatus = mod.NewProc("VBVMR_MacroButton_SetStatus")
+
+	vmGetMidiMessage = mod.NewProc("VBVMR_GetMidiMessage")
 )
 
 // login logs into the API,
 // attempts to launch Voicemeeter if it's not running,
 // initializes dirty parameters.
-func login(kindId string) {
+func login(kindId string) error {
 	res, _, _ := vmLogin.Call()
 	if res == 1 {
 		runVoicemeeter(kindId)
 		time.Sleep(time.Second)
 	} else if res != 0 {
 		err := fmt.Errorf("VBVMR_Login returned %d", res)
-		fmt.Println(err)
+		return err
-		os.Exit(1)
 	}
-	fmt.Println("Logged into API")
+	fmt.Printf("Logged into Voicemeeter %s\n", kindId)
 	for pdirty() || mdirty() {
 	}
+	return nil
 }
 
 // logout logs out of the API,
 // delayed for 100ms to allow final operation to complete.
-func logout() {
+func logout(kindId string) error {
 	time.Sleep(100 * time.Millisecond)
 	res, _, _ := vmLogout.Call()
 	if res != 0 {
 		err := fmt.Errorf("VBVMR_Logout returned %d", res)
-		fmt.Println(err)
+		return err
-		os.Exit(1)
 	}
-	fmt.Println("Logged out of API")
+	fmt.Printf("Logged out of Voicemeeter %s\n", kindId)
+	return nil
 }
 
 // runVoicemeeter attempts to launch a Voicemeeter GUI of a kind.
-func runVoicemeeter(kindId string) {
+func runVoicemeeter(kindId string) error {
 	vals := map[string]uint64{
 		"basic":  1,
 		"banana": 2,
@@ -80,25 +81,24 @@ func runVoicemeeter(kindId string) {
 	res, _, _ := vmRunvm.Call(uintptr(vals[kindId]))
 	if res != 0 {
 		err := fmt.Errorf("VBVMR_RunVoicemeeter returned %d", res)
-		fmt.Println(err)
+		return err
-		os.Exit(1)
 	}
+	return nil
 }
 
 // getVersion returns the version of Voicemeeter as a string
-func getVersion() string {
+func getVersion() (string, error) {
 	var ver uint64
 	res, _, _ := vmGetvmVersion.Call(uintptr(unsafe.Pointer(&ver)))
 	if res != 0 {
 		err := fmt.Errorf("VBVMR_GetVoicemeeterVersion returned %d", res)
-		fmt.Println(err)
+		return "", err
-		os.Exit(1)
 	}
 	v1 := (ver & 0xFF000000) >> 24
 	v2 := (ver & 0x00FF0000) >> 16
 	v3 := (ver & 0x0000FF00) >> 8
 	v4 := ver & 0x000000FF
-	return fmt.Sprintf("%d.%d.%d.%d", v1, v2, v3, v4)
+	return fmt.Sprintf("%d.%d.%d.%d", v1, v2, v3, v4), nil
 }
 
 // pdirty returns true iff a parameter value has changed
@@ -119,37 +119,38 @@ func ldirty(k *kind) bool {
 	_levelCache.busLevelsBuff = make([]float32, 8*k.NumBus())
 
 	for i := 0; i < (2*k.PhysIn)+(8*k.VirtIn); i++ {
-		_levelCache.stripLevelsBuff[i] = float32(getLevel(_levelCache.stripMode, i))
+		val, _ := getLevel(_levelCache.stripMode, i)
+		_levelCache.stripLevelsBuff[i] = val
 		_levelCache.stripComp[i] = _levelCache.stripLevelsBuff[i] == _levelCache.stripLevels[i]
 	}
 	for i := 0; i < 8*k.NumBus(); i++ {
-		_levelCache.busLevelsBuff[i] = float32(getLevel(3, i))
+		val, _ := getLevel(3, i)
+		_levelCache.busLevelsBuff[i] = val
 		_levelCache.busComp[i] = _levelCache.busLevelsBuff[i] == _levelCache.busLevels[i]
 	}
 	return !(allTrue(_levelCache.stripComp, (2*k.PhysIn)+(8*k.VirtIn)) && allTrue(_levelCache.busComp, 8*k.NumBus()))
 }
 
 // getVMType returns the type of Voicemeeter, as a string
-func getVMType() string {
+func getVMType() (string, error) {
 	var type_ uint64
 	res, _, _ := vmGetvmType.Call(
 		uintptr(unsafe.Pointer(&type_)),
 	)
 	if res != 0 {
 		err := fmt.Errorf("VBVMR_GetVoicemeeterType returned %d", res)
-		fmt.Println(err)
+		return "", err
-		os.Exit(1)
 	}
 	vals := map[uint64]string{
 		1: "basic",
 		2: "banana",
 		3: "potato",
 	}
-	return vals[type_]
+	return vals[type_], nil
 }
 
 // getParameterFloat gets the value of a float parameter
-func getParameterFloat(name string) float64 {
+func getParameterFloat(name string) (float64, error) {
 	var value float32
 	b := append([]byte(name), 0)
 	res, _, _ := vmGetParamFloat.Call(
@@ -158,14 +159,13 @@ func getParameterFloat(name string) float64 {
 	)
 	if res != 0 {
 		err := fmt.Errorf("VBVMR_GetParameterFloat returned %d", res)
-		fmt.Println(err)
+		return 0, err
-		os.Exit(1)
 	}
-	return math.Round(float64(value)*10) / 10
+	return math.Round(float64(value)*10) / 10, nil
 }
 
 // setParameterFloat sets the value of a float parameter
-func setParameterFloat(name string, value float32) {
+func setParameterFloat(name string, value float32) error {
 	b1 := append([]byte(name), 0)
 	b2 := math.Float32bits(value)
 	res, _, _ := vmSetParamFloat.Call(
@@ -174,13 +174,13 @@ func setParameterFloat(name string, value float32) {
 	)
 	if res != 0 {
 		err := fmt.Errorf("VBVMR_SetParameterFloat returned %d", res)
-		fmt.Println(err)
+		return err
-		os.Exit(1)
 	}
+	return nil
 }
 
 // getParameterString gets the value of a string parameter
-func getParameterString(name string) string {
+func getParameterString(name string) (string, error) {
 	b1 := append([]byte(name), 0)
 	var b2 [512]byte
 	res, _, _ := vmGetParamString.Call(
@@ -189,15 +189,14 @@ func getParameterString(name string) string {
 	)
 	if res != 0 {
 		err := fmt.Errorf("VBVMR_GetParameterStringA returned %d", res)
-		fmt.Println(err)
+		return "", err
-		os.Exit(1)
 	}
 	str := bytes.Trim(b2[:], "\x00")
-	return string(str)
+	return string(str), nil
 }
 
-// getParameterString sets the value of a string parameter
+// setParameterString sets the value of a string parameter
-func setParameterString(name, value string) {
+func setParameterString(name, value string) error {
 	b1 := append([]byte(name), 0)
 	b2 := append([]byte(value), 0)
 	res, _, _ := vmSetParamString.Call(
@@ -206,26 +205,26 @@ func setParameterString(name, value string) {
 	)
 	if res != 0 {
 		err := fmt.Errorf("VBVMR_SetParameterStringA returned %d", res)
-		fmt.Println(err)
+		return err
-		os.Exit(1)
 	}
+	return nil
 }
 
 // setParametersMulti sets multiple parameters with a script
-func setParametersMulti(script string) {
+func setParametersMulti(script string) error {
 	b1 := append([]byte(script), 0)
 	res, _, _ := vmSetParameters.Call(
 		uintptr(unsafe.Pointer(&b1[0])),
 	)
 	if res != 0 {
 		err := fmt.Errorf("VBVMR_SetParameters returned %d", res)
-		fmt.Println(err)
+		return err
-		os.Exit(1)
 	}
+	return nil
 }
 
 // getMacroStatus gets a macrobutton value
-func getMacroStatus(id, mode int) float32 {
+func getMacroStatus(id, mode int) (float32, error) {
 	var state float32
 	res, _, _ := vmGetMacroStatus.Call(
 		uintptr(id),
@@ -234,14 +233,13 @@ func getMacroStatus(id, mode int) float32 {
 	)
 	if res != 0 {
 		err := fmt.Errorf("VBVMR_MacroButton_GetStatus returned %d", res)
-		fmt.Println(err)
+		return 0, err
-		os.Exit(1)
 	}
-	return state
+	return state, nil
 }
 
 // setMacroStatus sets a macrobutton value
-func setMacroStatus(id, state, mode int) {
+func setMacroStatus(id, state, mode int) error {
 	res, _, _ := vmSetMacroStatus.Call(
 		uintptr(id),
 		uintptr(state),
@@ -249,9 +247,9 @@ func setMacroStatus(id, state, mode int) {
 	)
 	if res != 0 {
 		err := fmt.Errorf("VBVMR_MacroButton_SetStatus returned %d", res)
-		fmt.Println(err)
+		return err
-		os.Exit(1)
 	}
+	return nil
 }
 
 // getNumDevices returns the number of hardware input/output devices
@@ -266,7 +264,7 @@ func getNumDevices(dir string) uint64 {
 }
 
 // getDeviceDescription returns name, driver type and hwid for a given device
-func getDeviceDescription(i int, dir string) (string, uint64, string) {
+func getDeviceDescription(i int, dir string) (string, uint64, string, error) {
 	var t_ uint64
 	var b1 [512]byte
 	var b2 [512]byte
@@ -279,8 +277,7 @@ func getDeviceDescription(i int, dir string) (string, uint64, string) {
 		)
 		if res != 0 {
 			err := fmt.Errorf("VBVMR_Input_GetDeviceDescA returned %d", res)
-			fmt.Println(err)
+			return "", 0, "", err
-			os.Exit(1)
 		}
 	} else {
 		res, _, _ := vmGetDevDescOut.Call(
@@ -291,17 +288,16 @@ func getDeviceDescription(i int, dir string) (string, uint64, string) {
 		)
 		if res != 0 {
 			err := fmt.Errorf("VBVMR_Output_GetDeviceDescA returned %d", res)
-			fmt.Println(err)
+			return "", 0, "", err
-			os.Exit(1)
 		}
 	}
 	name := bytes.Trim(b1[:], "\x00")
 	hwid := bytes.Trim(b2[:], "\x00")
-	return string(name), t_, string(hwid)
+	return string(name), t_, string(hwid), nil
 }
 
 // getLevel returns a single level value of type type_ for channel[i]
-func getLevel(type_, i int) float32 {
+func getLevel(type_, i int) (float32, error) {
 	var val float32
 	res, _, _ := vmGetLevelFloat.Call(
 		uintptr(type_),
@@ -310,8 +306,41 @@ func getLevel(type_, i int) float32 {
 	)
 	if res != 0 {
 		err := fmt.Errorf("VBVMR_GetLevel returned %d", res)
-		fmt.Println(err)
+		return 0, err
-		os.Exit(1)
 	}
-	return val
+	return val, nil
+}
+
+// getMidiMessage gets midi channel, pitch and velocity for a single midi input
+func getMidiMessage() bool {
+	var midi = newMidi()
+	var b1 [1024]byte
+	res, _, _ := vmGetMidiMessage.Call(
+		uintptr(unsafe.Pointer(&b1[0])),
+		uintptr(1024),
+	)
+	x := int(res)
+	if x < 0 {
+		err := fmt.Errorf("VBVMR_GetMidiMessage returned %d", res)
+		if err != nil {
+			fmt.Println(err)
+		}
+		return false
+	}
+	msg := bytes.Trim(b1[:], "\x00")
+	if len(msg) > 0 {
+		for i := 0; i < len(msg)%3; i++ {
+			msg = append(msg, 0)
+		}
+
+		for i := 0; i < len(msg); i += 3 {
+			var ch = int(msg[i])
+			var pitch = int(msg[i+1])
+			var vel = int(msg[i+2])
+			midi.channel = ch
+			midi.current = pitch
+			midi.cache[pitch] = vel
+		}
+	}
+	return len(msg) > 0
 }

button.go

@@ -14,7 +14,11 @@ func newButton(i int) button {
 
 // getter returns the value of a macrobutton parameter
 func (m *button) getter(mode int) bool {
-	return getMacroStatus(m.index, mode) == 1
+	val, err := getMacroStatus(m.index, mode)
+	if err != nil {
+		fmt.Println(err)
+	}
+	return val == 1
 }
 
 // setter sets the value of a macrobutton parameter

device.go

@@ -1,5 +1,7 @@
 package voicemeeter
 
+import "fmt"
+
 type devDesc struct {
 	Name, Type, Hwid string
 }
@@ -22,7 +24,10 @@ func (d *device) Outs() int {
 }
 
 func (d *device) Input(i int) devDesc {
-	n, t_, id := getDeviceDescription(i, "in")
+	n, t_, id, err := getDeviceDescription(i, "in")
+	if err != nil {
+		fmt.Println(err)
+	}
 	vals := map[uint64]string{
 		1: "mme",
 		3: "wdm",
@@ -33,7 +38,10 @@ func (d *device) Input(i int) devDesc {
 }
 
 func (d *device) Output(i int) devDesc {
-	n, t_, id := getDeviceDescription(i, "out")
+	n, t_, id, err := getDeviceDescription(i, "out")
+	if err != nil {
+		fmt.Println(err)
+	}
 	vals := map[uint64]string{
 		1: "mme",
 		3: "wdm",

examples/obs/go.mod

@@ -0,0 +1,16 @@
+module main
+
+go 1.18
+
+require (
+	github.com/andreykaipov/goobs v0.10.0
+	github.com/onyx-and-iris/voicemeeter-api-go v1.4.1
+)
+
+require (
+	github.com/buger/jsonparser v1.1.1 // indirect
+	github.com/gorilla/websocket v1.5.0 // indirect
+	github.com/hashicorp/logutils v1.0.0 // indirect
+	github.com/nu7hatch/gouuid v0.0.0-20131221200532-179d4d0c4d8d // indirect
+	golang.org/x/sys v0.0.0-20220708085239-5a0f0661e09d // indirect
+)

examples/obs/go.sum

@@ -0,0 +1,18 @@
+github.com/andreykaipov/goobs v0.10.0 h1:wa4CxbYu/NqwUmx5E4/baDqYRYEmfHwg2T23RAg3jlU=
+github.com/andreykaipov/goobs v0.10.0/go.mod h1:EqG73Uu/4npyhXIWWszgRelNkEeIz+d0slUT6NKWYs4=
+github.com/buger/jsonparser v1.1.1 h1:2PnMjfWD7wBILjqQbt530v576A/cAbQvEW9gGIpYMUs=
+github.com/buger/jsonparser v1.1.1/go.mod h1:6RYKKt7H4d4+iWqouImQ9R2FZql3VbhNgx27UK13J/0=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/gorilla/websocket v1.5.0 h1:PPwGk2jz7EePpoHN/+ClbZu8SPxiqlu12wZP/3sWmnc=
+github.com/gorilla/websocket v1.5.0/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
+github.com/hashicorp/logutils v1.0.0 h1:dLEQVugN8vlakKOUE3ihGLTZJRB4j+M2cdTm/ORI65Y=
+github.com/hashicorp/logutils v1.0.0/go.mod h1:QIAnNjmIWmVIIkWDTG1z5v++HQmx9WQRO+LraFDTW64=
+github.com/nu7hatch/gouuid v0.0.0-20131221200532-179d4d0c4d8d h1:VhgPp6v9qf9Agr/56bj7Y/xa04UccTW04VP0Qed4vnQ=
+github.com/nu7hatch/gouuid v0.0.0-20131221200532-179d4d0c4d8d/go.mod h1:YUTz3bUH2ZwIWBy3CJBeOBEugqcmXREj14T+iG/4k4U=
+github.com/onyx-and-iris/voicemeeter-api-go v1.4.1 h1:2vGaRGCPwN9PlWspbdkDelsfxWHHkZqxozkd6FOcl28=
+github.com/onyx-and-iris/voicemeeter-api-go v1.4.1/go.mod h1:zAdBhHXQ9n37CUbLizbOPmAutyZI8Ncqeu5e9u1Fy14=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/stretchr/testify v1.8.0 h1:pSgiaMZlXftHpm5L7V1+rVB+AZJydKsMxsQBIJw4PKk=
+golang.org/x/sys v0.0.0-20220708085239-5a0f0661e09d h1:/m5NbqQelATgoSPVC2Z23sR4kVNokFwDDyWh/3rGY+I=
+golang.org/x/sys v0.0.0-20220708085239-5a0f0661e09d/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=

examples/obs/main.go

@@ -0,0 +1,81 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"time"
+
+	"github.com/onyx-and-iris/voicemeeter-api-go"
+
+	"github.com/andreykaipov/goobs"
+	"github.com/andreykaipov/goobs/api/events"
+)
+
+func onStart(vm *voicemeeter.Remote) {
+	vm.Strip[0].SetMute(true)
+	vm.Strip[1].SetB1(true)
+	vm.Strip[2].SetB1(true)
+}
+
+func onBrb(vm *voicemeeter.Remote) {
+	vm.Strip[7].FadeTo(0, 500)
+	vm.Bus[0].SetMute(true)
+}
+
+func onLive(vm *voicemeeter.Remote) {
+	vm.Strip[0].SetMute(false)
+	vm.Strip[7].FadeTo(-6, 500)
+	vm.Strip[7].SetA3(true)
+	vm.Vban.InStream[0].SetOn(true)
+}
+
+func onEnd(vm *voicemeeter.Remote) {
+	vm.Strip[0].SetMute(true)
+	vm.Strip[1].SetMute(true)
+	vm.Strip[1].SetB1(false)
+	vm.Strip[2].SetMute(true)
+	vm.Strip[2].SetB1(false)
+	vm.Vban.InStream[0].SetOn(false)
+}
+
+func main() {
+	vm, err := voicemeeter.NewRemote("potato")
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	err = vm.Login()
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer vm.Logout()
+
+	obs, err := goobs.New("localhost:4455", goobs.WithPassword("mystrongpass"))
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer obs.Disconnect()
+
+	version, _ := obs.General.GetVersion()
+	fmt.Printf("OBS Studio version: %s\n", version.ObsVersion)
+	fmt.Printf("Websocket server version: %s\n", version.ObsWebSocketVersion)
+
+	go obs.Listen(func(event any) {
+		switch e := event.(type) {
+		case *events.CurrentProgramSceneChanged:
+			fmt.Printf("Switched to scene %s\n", e.SceneName)
+			switch e.SceneName {
+			case "START":
+				onStart(vm)
+			case "BRB":
+				onBrb(vm)
+			case "LIVE":
+				onLive(vm)
+			case "END":
+				onEnd(vm)
+			}
+		}
+	})
+
+	time.Sleep(30 * time.Second)
+}

examples/observer/main.go

@@ -2,7 +2,7 @@ package main
 
 import (
 	"fmt"
-	"strings"
+	"log"
 	"time"
 
 	"github.com/onyx-and-iris/voicemeeter-api-go"
@@ -12,14 +12,24 @@ type observer struct {
 	vm *voicemeeter.Remote
 }
 
+func (o observer) Register() {
+	o.vm.Register(o)
+}
+
+func (o observer) Deregister() {
+	o.vm.Deregister(o)
+}
+
 func (o observer) OnUpdate(subject string) {
-	if strings.Compare(subject, "pdirty") == 0 {
+	if subject == "pdirty" {
 		fmt.Println("pdirty!")
-	}
+	} else if subject == "mdirty" {
-	if strings.Compare(subject, "mdirty") == 0 {
 		fmt.Println("mdirty!")
-	}
+	} else if subject == "midi" {
-	if strings.Compare(subject, "ldirty") == 0 {
+		var current = o.vm.Midi.Current()
+		var val = o.vm.Midi.Get(current)
+		fmt.Printf("Value of midi button %d: %d\n", current, val)
+	} else if subject == "ldirty" {
 		fmt.Printf("%v %v %v %v %v %v %v %v\n",
 			o.vm.Bus[0].Levels().IsDirty(),
 			o.vm.Bus[1].Levels().IsDirty(),
@@ -34,13 +44,21 @@ func (o observer) OnUpdate(subject string) {
 }
 
 func main() {
-	vm := voicemeeter.NewRemote("potato")
+	vm, err := voicemeeter.NewRemote("potato")
-	vm.Login()
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	err = vm.Login()
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer vm.Logout()
+	// enable level updates (disabled by default)
+	vm.EventAdd("ldirty")
 
 	o := observer{vm}
-	vm.Register(o)
+	o.Register()
 	time.Sleep(30 * time.Second)
-	vm.Deregister(o)
+	o.Deregister()
-
-	vm.Logout()
 }

helper_test.go

@@ -0,0 +1,29 @@
+package voicemeeter
+
+import (
+	"log"
+	"os"
+	"testing"
+	"time"
+)
+
+var (
+	vm, err = NewRemote("potato")
+)
+
+func TestMain(m *testing.M) {
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	vm.Login()
+	code := m.Run()
+	vm.Logout()
+	os.Exit(code)
+}
+
+func sync() {
+	time.Sleep(30 * time.Millisecond)
+	for vm.Pdirty() || vm.Mdirty() {
+	}
+}

iremote.go

@@ -19,7 +19,11 @@ func (ir *iRemote) identifier() string {
 // getter_bool returns the value of a boolean parameter
 func (ir *iRemote) getter_bool(p string) bool {
 	param := fmt.Sprintf("%s.%s", ir.identifier(), p)
-	return getParameterFloat(param) == 1
+	val, err := getParameterFloat(param)
+	if err != nil {
+		fmt.Println(err)
+	}
+	return val == 1
 }
 
 // setter_bool sets the value of a boolean parameter
@@ -31,41 +35,65 @@ func (ir *iRemote) setter_bool(p string, v bool) {
 	} else {
 		value = 0
 	}
-	setParameterFloat(param, float32(value))
+	err := setParameterFloat(param, float32(value))
+	if err != nil {
+		fmt.Println(err)
+	}
 }
 
 // getter_int returns the value of an int parameter p
 func (ir *iRemote) getter_int(p string) int {
 	param := fmt.Sprintf("%s.%s", ir.identifier(), p)
-	return int(getParameterFloat(param))
+	val, err := getParameterFloat(param)
+	if err != nil {
+		fmt.Println(err)
+	}
+	return int(val)
 }
 
 // setter_int sets the value v of an int parameter p
 func (ir *iRemote) setter_int(p string, v int) {
 	param := fmt.Sprintf("%s.%s", ir.identifier(), p)
-	setParameterFloat(param, float32(v))
+	err := setParameterFloat(param, float32(v))
+	if err != nil {
+		fmt.Println(err)
+	}
 }
 
 // getter_float returns the value of an int parameter p
 func (ir *iRemote) getter_float(p string) float64 {
 	param := fmt.Sprintf("%s.%s", ir.identifier(), p)
-	return getParameterFloat(param)
+	val, err := getParameterFloat(param)
+	if err != nil {
+		fmt.Println(err)
+	}
+	return val
 }
 
 // setter_float sets the value v of an int parameter p
 func (ir *iRemote) setter_float(p string, v float32) {
 	param := fmt.Sprintf("%s.%s", ir.identifier(), p)
-	setParameterFloat(param, float32(v))
+	err := setParameterFloat(param, float32(v))
+	if err != nil {
+		fmt.Println(err)
+	}
 }
 
 // getter_string returns the value of a string parameter p
 func (ir *iRemote) getter_string(p string) string {
 	param := fmt.Sprintf("%s.%s", ir.identifier(), p)
-	return getParameterString(param)
+	val, err := getParameterString(param)
+	if err != nil {
+		fmt.Println(err)
+	}
+	return val
 }
 
 // setter_string sets the value v of a string parameter p
 func (ir *iRemote) setter_string(p, v string) {
 	param := fmt.Sprintf("%s.%s", ir.identifier(), p)
-	setParameterString(param, v)
+	err := setParameterString(param, v)
+	if err != nil {
+		fmt.Println(err)
+	}
 }

midi.go

@@ -0,0 +1,28 @@
+package voicemeeter
+
+var midi *midi_t
+
+type midi_t struct {
+	channel int
+	current int
+	cache   map[int]int
+}
+
+func newMidi() *midi_t {
+	if midi == nil {
+		midi = &midi_t{0, 0, map[int]int{}}
+	}
+	return midi
+}
+
+func (m *midi_t) Channel() int {
+	return m.channel
+}
+
+func (m *midi_t) Current() int {
+	return m.current
+}
+
+func (m *midi_t) Get(key int) int {
+	return m.cache[key]
+}

path.go

@@ -3,7 +3,7 @@ package voicemeeter
 import (
 	"errors"
 	"fmt"
-	"os"
+	"log"
 	"path/filepath"
 	"runtime"
 	"strings"
@@ -49,8 +49,7 @@ func dllPath() (string, error) {
 func getDllPath() string {
 	path, err := dllPath()
 	if err != nil {
-		fmt.Println(err)
+		log.Fatal(err)
-		os.Exit(1)
 	}
 	return path
 }

publisher.go

@@ -40,41 +40,97 @@ func (p *publisher) notify(subject string) {
 	}
 }
 
+type event struct {
+	pdirty bool
+	mdirty bool
+	midi   bool
+	ldirty bool
+}
+
+func newEvent() *event {
+	return &event{true, true, true, false}
+}
+
+func (e *event) Add(ev string) {
+	switch ev {
+	case "pdirty":
+		e.pdirty = true
+	case "mdirty":
+		e.mdirty = true
+	case "midi":
+		e.midi = true
+	case "ldirty":
+		e.ldirty = true
+	}
+}
+
+func (e *event) Remove(ev string) {
+	switch ev {
+	case "pdirty":
+		e.pdirty = false
+	case "mdirty":
+		e.mdirty = false
+	case "midi":
+		e.midi = false
+	case "ldirty":
+		e.ldirty = false
+	}
+}
+
 // pooler continuously polls the dirty paramters
 // it is expected to be run in a goroutine
 type pooler struct {
-	k   *kind
+	k     *kind
-	run bool
+	run   bool
+	event *event
 	publisher
 }
 
 func newPooler(k *kind) *pooler {
 	p := &pooler{
-		k:   k,
+		k:     k,
-		run: true,
+		run:   true,
+		event: newEvent(),
 	}
-	go p.runner()
+	go p.parameters()
+	go p.macrobuttons()
+	go p.midi()
 	go p.levels()
 	return p
 }
 
-func (p *pooler) runner() {
+func (p *pooler) parameters() {
 	for p.run {
-		if pdirty() {
+		if p.event.pdirty && pdirty() {
 			p.notify("pdirty")
 		}
-		if mdirty() {
+		time.Sleep(33 * time.Millisecond)
+	}
+}
+
+func (p *pooler) macrobuttons() {
+	for p.run {
+		if p.event.mdirty && mdirty() {
 			p.notify("mdirty")
 		}
 		time.Sleep(33 * time.Millisecond)
 	}
 }
 
+func (p *pooler) midi() {
+	for p.run {
+		if p.event.midi && getMidiMessage() {
+			p.notify("midi")
+		}
+		time.Sleep(33 * time.Millisecond)
+	}
+}
+
 func (p *pooler) levels() {
 	_levelCache = newLevelCache(p.k)
 
 	for p.run {
-		if ldirty(p.k) {
+		if p.event.ldirty && ldirty(p.k) {
 			update(_levelCache.stripLevels, _levelCache.stripLevelsBuff, (2*p.k.PhysIn)+(8*p.k.VirtIn))
 			update(_levelCache.busLevels, _levelCache.busLevelsBuff, 8*p.k.NumBus())
 			p.notify("ldirty")

remote.go

@@ -2,7 +2,6 @@ package voicemeeter
 
 import (
 	"fmt"
-	"os"
 )
 
 // A Remote type represents the API for a kind
@@ -15,6 +14,7 @@ type Remote struct {
 	Vban     *vban
 	Device   *device
 	Recorder *recorder
+	Midi     *midi_t
 
 	pooler *pooler
 }
@@ -26,26 +26,42 @@ func (r *Remote) String() string {
 
 // Login logs into the API
 // then it intializes the pooler
-func (r *Remote) Login() {
+func (r *Remote) Login() error {
-	login(r.Kind.Name)
+	err := login(r.Kind.Name)
+	if err != nil {
+		return err
+	}
 	r.pooler = newPooler(r.Kind)
+	return nil
 }
 
 // Logout logs out of the API
 // it also terminates the pooler
-func (r *Remote) Logout() {
+func (r *Remote) Logout() error {
 	r.pooler.run = false
-	logout()
+	err := logout(r.Kind.Name)
+	if err != nil {
+		return err
+	}
+	return nil
 }
 
 // Type returns the type of Voicemeeter (basic, banana, potato)
 func (r *Remote) Type() string {
-	return getVMType()
+	val, err := getVMType()
+	if err != nil {
+		fmt.Println(err)
+	}
+	return val
 }
 
 // Version returns the version of Voicemeeter as a string
 func (r *Remote) Version() string {
-	return getVersion()
+	val, err := getVersion()
+	if err != nil {
+		fmt.Println(err)
+	}
+	return val
 }
 
 // Pdirty returns true iff a parameter value has changed
@@ -58,6 +74,34 @@ func (r *Remote) Mdirty() bool {
 	return mdirty()
 }
 
+// Gets a float parameter value
+func (r *Remote) GetFloat(name string) float64 {
+	val, err := getParameterFloat(name)
+	if err != nil {
+		fmt.Println(err)
+	}
+	return val
+}
+
+// Sets a float paramter value
+func (r *Remote) SetFloat(name string, value float32) {
+	setParameterFloat(name, value)
+}
+
+// Gets a string parameter value
+func (r *Remote) GetString(name string) string {
+	val, err := getParameterString(name)
+	if err != nil {
+		fmt.Println(err)
+	}
+	return val
+}
+
+// Sets a string paramter value
+func (r *Remote) SetString(name, value string) {
+	setParameterString(name, value)
+}
+
 // SendText sets multiple parameters by script
 func (r *Remote) SendText(script string) {
 	setParametersMulti(script)
@@ -73,6 +117,16 @@ func (r *Remote) Deregister(o observer) {
 	r.pooler.Deregister(o)
 }
 
+// EventAdd adds an event to the Pooler
+func (r *Remote) EventAdd(event string) {
+	r.pooler.event.Add(event)
+}
+
+// EventRemove removes an event from the Pooler
+func (r *Remote) EventRemove(event string) {
+	r.pooler.event.Remove(event)
+}
+
 // remoteBuilder defines the interface builder types must satisfy
 type remoteBuilder interface {
 	setKind() remoteBuilder
@@ -83,6 +137,7 @@ type remoteBuilder interface {
 	makeVban() remoteBuilder
 	makeDevice() remoteBuilder
 	makeRecorder() remoteBuilder
+	makeMidi() remoteBuilder
 	Build() remoteBuilder
 	Get() *Remote
 }
@@ -190,6 +245,13 @@ func (b *genericBuilder) makeRecorder() remoteBuilder {
 	return b
 }
 
+// makeMidi makes a midi type and assigns it to remote.Midi
+func (b *genericBuilder) makeMidi() remoteBuilder {
+	fmt.Println("building midi")
+	b.r.Midi = newMidi()
+	return b
+}
+
 // Get returns a fully constructed remote type for a kind
 func (b *genericBuilder) Get() *Remote {
 	return &b.r
@@ -202,7 +264,14 @@ type basicBuilder struct {
 
 // Build defines the steps required to build a basic type
 func (basb *genericBuilder) Build() remoteBuilder {
-	return basb.setKind().makeStrip().makeBus().makeButton().makeCommand().makeVban().makeDevice()
+	return basb.setKind().
+		makeStrip().
+		makeBus().
+		makeButton().
+		makeCommand().
+		makeVban().
+		makeDevice().
+		makeMidi()
 }
 
 // bananaBuilder represents a builder specific to banana type
@@ -212,7 +281,15 @@ type bananaBuilder struct {
 
 // Build defines the steps required to build a banana type
 func (banb *bananaBuilder) Build() remoteBuilder {
-	return banb.setKind().makeStrip().makeBus().makeButton().makeCommand().makeVban().makeDevice().makeRecorder()
+	return banb.setKind().
+		makeStrip().
+		makeBus().
+		makeButton().
+		makeCommand().
+		makeVban().
+		makeDevice().
+		makeRecorder().
+		makeMidi()
 }
 
 // potatoBuilder represents a builder specific to potato type
@@ -222,17 +299,24 @@ type potatoBuilder struct {
 
 // Build defines the steps required to build a potato type
 func (potb *potatoBuilder) Build() remoteBuilder {
-	return potb.setKind().makeStrip().makeBus().makeButton().makeCommand().makeVban().makeDevice().makeRecorder()
+	return potb.setKind().
+		makeStrip().
+		makeBus().
+		makeButton().
+		makeCommand().
+		makeVban().
+		makeDevice().
+		makeRecorder().
+		makeMidi()
 }
 
 // NewRemote returns a Remote type for a kind
 // this is the interface entry point
-func NewRemote(kindId string) *Remote {
+func NewRemote(kindId string) (*Remote, error) {
 	_kind, ok := kindMap[kindId]
 	if !ok {
 		err := fmt.Errorf("unknown Voicemeeter kind '%s'", kindId)
-		fmt.Println(err)
+		return nil, err
-		os.Exit(1)
 	}
 
 	director := director{}
@@ -245,5 +329,5 @@ func NewRemote(kindId string) *Remote {
 		director.SetBuilder(&potatoBuilder{genericBuilder{_kind, Remote{}}})
 	}
 	director.Construct()
-	return director.Get()
+	return director.Get(), nil
 }

remote_test.go

@@ -8,7 +8,7 @@ import (
 
 func TestGetBasicRemote(t *testing.T) {
 	//t.Skip("skipping test")
-	__rem := NewRemote("basic")
+	__rem, _ := NewRemote("basic")
 	t.Run("Should return a remote basic type", func(t *testing.T) {
 		assert.NotNil(t, __rem)
 	})
@@ -34,7 +34,7 @@ func TestGetBasicRemote(t *testing.T) {
 
 func TestGetBananaRemote(t *testing.T) {
 	//t.Skip("skipping test")
-	__rem := NewRemote("banana")
+	__rem, _ := NewRemote("banana")
 	t.Run("Should return a remote banana type", func(t *testing.T) {
 		assert.NotNil(t, __rem)
 	})
@@ -60,7 +60,7 @@ func TestGetBananaRemote(t *testing.T) {
 
 func TestGetPotatoRemote(t *testing.T) {
 	//t.Skip("skipping test")
-	__rem := NewRemote("potato")
+	__rem, _ := NewRemote("potato")
 	t.Run("Should return a remote basic type", func(t *testing.T) {
 		assert.NotNil(t, __rem)
 	})
@@ -83,3 +83,24 @@ func TestGetPotatoRemote(t *testing.T) {
 		assert.NotNil(t, __rem.Recorder)
 	})
 }
+
+func TestSetAndGetFloatParameter(t *testing.T) {
+	//t.Skip("skipping test")
+	var param = "strip[0].mute"
+	vm.SetFloat(param, 1)
+	sync()
+	t.Run("Should get a float parameter", func(t *testing.T) {
+		assert.Equal(t, float64(1), vm.GetFloat(param))
+	})
+}
+
+func TestSetAndGetStringParameter(t *testing.T) {
+	//t.Skip("skipping test")
+	var param = "strip[0].label"
+	var val = "test0"
+	vm.SetString(param, val)
+	sync()
+	t.Run("Should get a string parameter", func(t *testing.T) {
+		assert.Equal(t, val, vm.GetString(param))
+	})
+}

tests/helper_test.go

@@ -1,6 +1,7 @@
 package voicemeeter_test
 
 import (
+	"log"
 	"os"
 	"testing"
 	"time"
@@ -9,10 +10,15 @@ import (
 )
 
 var (
-	vm = voicemeeter.NewRemote("potato")
+	vm, err = voicemeeter.NewRemote("potato")
 )
 
 func TestMain(m *testing.M) {
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer vm.Logout()
+
 	vm.Login()
 	code := m.Run()
 	vm.Logout()