fix nullpointer

Author: LabyStudio

src/main/java/de/labystudio/spotifyapi/platform/windows/api/spotify/SpotifyProcess.java

@@ -61,7 +61,7 @@ public SpotifyProcess() {
         Psapi.ModuleInfo spotifyExeModule = this.getModuleInfo("Spotify.exe");
         Psapi.ModuleInfo libCefModule = this.getModuleInfo("libcef.dll");
         long minAddress = spotifyExeModule == null ? 0 : spotifyExeModule.getBaseOfDll();
-        long maxAddress = spotifyExeModule == null ? this.addressTrackId : libCefModule.getBaseOfDll();
+        long maxAddress = libCefModule == null ? this.addressTrackId : libCefModule.getBaseOfDll();
 
         // Check if the song is currently playing using the title bar
         boolean isPlaying = this.isPlayingUsingTitle();

src/test/java/SpotifyProcessTest.java

@@ -1,6 +1,12 @@
 import de.labystudio.spotifyapi.platform.windows.api.WinProcess;
 import de.labystudio.spotifyapi.platform.windows.api.jna.Psapi;
 import de.labystudio.spotifyapi.platform.windows.api.playback.PlaybackAccessor;
+import de.labystudio.spotifyapi.platform.windows.api.spotify.SpotifyTitle;
+
+import java.util.ArrayList;
+import java.util.Comparator;
+import java.util.List;
+import java.util.Map;
 
 public class SpotifyProcessTest {
 
@@ -14,16 +20,72 @@ public static void main(String[] args) {
         long addressTrackId = process.findAddressOfText(moduleInfo.getBaseOfDll(), "spotify:track:", 0);
         System.out.println("Track Id Address: 0x" + Long.toHexString(addressTrackId));
 
+        boolean isPlaying = process.getWindowTitle().contains(SpotifyTitle.DELIMITER);
         long addressPlayBack = process.findInMemory(
                 0,
                 addressTrackId,
                 PREFIX_CONTEXT,
                 (address, index) -> {
                     PlaybackAccessor accessor = new PlaybackAccessor(process, address);
-                    return accessor.isValid();
+                    boolean valid = accessor.isValid() && accessor.isPlaying() == isPlaying; // Check if address is valid
+
+                    // If valid then pull the data again and check if it is still valid
+                    if (valid) {
+                        accessor.update();
+                        return accessor.isValid();
+                    }
+
+                    return false;
                 }
         );
+        if (addressPlayBack == -1) {
+            System.out.println("Could not find playback address");
+            return;
+        }
         System.out.println("Playback Address: 0x" + Long.toHexString(addressPlayBack));
+
+        printModules(process, addressPlayBack);
+    }
+
+    public static void printModules(WinProcess process, long addressPlayBack) {
+        List<Module> modules = new ArrayList<>();
+        for (Map.Entry<String, Psapi.ModuleInfo> entry : process.getModules().entrySet()) {
+            modules.add(new Module(entry.getKey(), entry.getValue().getBaseOfDll()));
+        }
+        modules.sort(Comparator.comparingLong(o -> o.address));
+
+        int passed = 0;
+        for (Module entry : modules) {
+            long entryPoint = entry.address;
+            if (entryPoint > addressPlayBack) {
+                if (passed == 0) {
+                    System.out.println(Long.toHexString(addressPlayBack) + " CONTEXT ------------------------");
+                }
+                passed++;
+                if (passed > 1) {
+                    break;
+                }
+            }
+            System.out.println(Long.toHexString(entryPoint) + " " + entry.name);
+        }
+    }
+
+    private static class Module {
+        private final String name;
+        private final long address;
+
+        public Module(String name, long address) {
+            this.name = name;
+            this.address = address;
+        }
+
+        public String getName() {
+            return this.name;
+        }
+
+        public long getAddress() {
+            return this.address;
+        }
     }
 
 }