Simplify GUI settings and build flags

cmd/vrc_osc_gui/tray_windows.go

@@ -5,7 +5,9 @@ package main
 import (
 	"fmt"
 	"log"
+	"os"
 	"os/exec"
+	"path/filepath"
 	"syscall"
 	"unsafe"
 )
@@ -55,6 +57,14 @@ func openBrowser(url string) {
 	_ = exec.Command("rundll32", "url.dll,FileProtocolHandler", url).Start()
 }
 
+func trayIconPath() string {
+	exe, err := os.Executable()
+	if err != nil {
+		return filepath.Join("doc", "vrcworldtour_new.ico")
+	}
+	return filepath.Join(filepath.Dir(exe), "..", "doc", "vrcworldtour_new.ico")
+}
+
 func runTray(uiURL string, open func()) error {
 	user32 := syscall.NewLazyDLL("user32.dll")
 	shell32 := syscall.NewLazyDLL("shell32.dll")
@@ -72,7 +82,7 @@ func runTray(uiURL string, open func()) error {
 	setForegroundWindow := user32.NewProc("SetForegroundWindow")
 	trackPopupMenu := user32.NewProc("TrackPopupMenu")
 	showWindow := user32.NewProc("ShowWindow")
-	loadIcon := user32.NewProc("LoadIconW")
+	loadImage := user32.NewProc("LoadImageW")
 	shellNotifyIcon := shell32.NewProc("Shell_NotifyIconW")
 	getModuleHandle := kernel32.NewProc("GetModuleHandleW")
 
@@ -119,7 +129,13 @@ func runTray(uiURL string, open func()) error {
 
 	className, _ := syscall.UTF16PtrFromString("VRC_OSC_TRAY")
 	windowTitle, _ := syscall.UTF16PtrFromString("VRC OSC Tray")
-	icon, _, _ := loadIcon.Call(0, 32512) // IDI_APPLICATION
+	iconPath := trayIconPath()
+	iconPathPtr, _ := syscall.UTF16PtrFromString(iconPath)
+	const (
+		lrLoadFromFile = 0x00000010
+		imageIcon      = 1
+	)
+	icon, _, _ := loadImage.Call(0, uintptr(unsafe.Pointer(iconPathPtr)), imageIcon, 0, 0, lrLoadFromFile)
 
 	var hwnd uintptr
 	var menu uintptr